Complex Shear Modulus Value Research Articles

The influence of cooling on biomechanical time since death estimations using ovine brain tissue

The significance of biomechanical analyses for forensic time since death estimations has recently been demonstrated. Previous biomechanical analyses successfully discriminated post-mortem brain tissue from tissue with a post-mortem interval of at least one day when held at 20 °C. However, the practical utility of such analyses beyond day one at 20 °C was limited. This study investigates the storage, loss, and complex shear modulus of various brain regions in sheep stored at 4 °C in 24-hour intervals over four days post-mortem using rheometry tests. The aim is to identify the critical biomechanical tissue property values to predict post-mortem time and assess the temperature sensitivity of the rheometry method by comparing results to recent findings at 20 °C. Thirty sheep brains were examined, including the frontal lobe, parietal lobe, anterior and posterior deep brain, superior colliculi, pons, medulla, and cerebellum. Rheometry tests were conducted, and receiver operator characteristic analyses were employed to establish cut-off values. At 4 °C storage, all investigated biomechanical properties of the examined brain regions remained stable for at least one day post-mortem. Using cerebellar samples stored at 4 °C, a post-mortem interval of at least two days could be determined with excellent diagnostic ability. Complex shear modulus values below 1435 Pa or storage modulus values below 1313 Pa allowed prediction of two or more days post-mortem. Comparisons between 4 °C and 20 °C revealed brain region-specific results. For instance, the complex shear moduli of the anterior deep brain at 4 °C were significantly higher on all individual testing days when compared to 20 °C. In contrast, the combined medulla and pons samples were similar on each day. Rheometry testing of brain tissue consistently stored at 4 °C since death proved valuable for forensic time since death estimations starting from two days after death.

Construction and examination of temperature master curve for asphalt with different aging extents

Master curve is widely applied to assess the rheological properties of asphalt. The traditional master curve describes the variation of asphalt rheological properties with frequency. However, compared to frequency, the influence of temperature on asphalt properties is of greater concern. This study attempted to establish a method to transform the traditional master curve into temperature master curve. To this end, asphalt binder with different aging extents were prepared using aging simulation tests, and traditional complex shear modulus master curves of asphalt binder were established based on frequency sweep test. These were then transformed into temperature master curves using the established temperature-frequency equation. Furthermore, the accuracy of the temperature master curve was assessed through temperature sweep tests. The results showed that the temperature-frequency equation obtained based on Williams Landel Ferry equation effectively described the relationship between temperature and reduced frequency. The temperature master curve demonstrated good applicability for asphalt at different aging levels, with the differences between complex shear modulus values calculated by temperature master curve and the experimental values generally within 20%. The temperature master curve accurately characterized the trend of complex shear modulus with temperature. However, this accuracy and applicability were primarily focused on the mid-temperature and high-temperature ranges. The temperature master curve had obvious deficiency in predicting the complex shear modulus at low temperature. The findings provide new methods and insights into the relationship between asphalt rheological properties and temperature.

CHARACTERIZATION OF ASPHALT MODIFICATION USING GROUND RUBBER AND REACTIVE RUBBER NR-g-MA AS COMPATIBILIZER

This study aims to improve the quality of asphalt by adding ground tyre rubber (GR) and reactive rubber (NR-g-MA) as compatibilizers of asphalt-rubber mixability. The use of GR has been widely used to improve the performance of asphalt and extend the service life of asphalt. The NR-g-MA used was the product of the copolymerization of SIR-20 rubber grafts with maleic anhydrous (MA) through a melting process in an internal mixer. Mixing of GR in asphalt was carried out in an external mixer with composition of asphalt/GR 95/5 phr at the temperature of 180oC for 90 minutes. The performance of asphalts were measured based on conventional test of penetration and softening point. The rheological properties of asphalt were measured using a Dynamic Shear Rheometer (DSR). Important parameters of the rheological properties measured are complex shear modulus (G*) and phase angle (d). Asphalt resistance to the permanent deformation (rutting) were determined on asphalt that has undergone a short-term aging process in a rolling thin film oven (RTFO) and measured at high temperatures (58-82OC). Fatigue crack resistance was tested on asphalt that has undergone a long-term aging process using the method of pressure aging vessel (PAV) and measured at low temperatures (25-31OC). Asphalt-GR mixtures' chemical, thermal and morphological properties were studied using ATR-FTIR, DSC/TGA, and SEM respectively. The results showed that adding used ground rubber (GR) decreased the penetration value by 9.93 – 18.87% and increased the softening point of asphalt from 5.57 – 11.40%. Rheological analysis showed that the addition of GR and compatibilizer NR-g-MA increase the value of complex shear modulus (G*) and decrease the phase angle (d) of the asphalt. The addition of ground rubber and reactive rubber of NR-g-MA to asphalt improve the performance of asphalt because it has rutting resistance at high temperatures as well as improves asphalt cracking resistance at low-temperature measurements. The addition of NR-g-MA reactive rubber to modified asphalt ground rubber can increase the mixability of asphalt-rubber used tires.

Rheological properties of asphaltene-modified asphalt binder and mastic

Asphaltene is one of the component of asphalt binder. Asphaltene certainly contributes to the elasticity and stiffness of a binder's traditional viscoelastic behaviour. Introducing asphaltene as a separate modifier may improve the qualities of asphalt mastic. The influence of asphaltene on the rheological properties of asphalt binder and mastic is discussed in this paper. Asphalt binder grade 60/70 PEN was modified by adding with 1% asphaltene content. Asphalt mastic was then prepared using asphaltene-modified asphalt binder and aggregates passing 75 μm. A viscosity and a dynamic shear rheometer (DSR) test were performed to evaluate the rheological properties indexes such as rutting factor (G*/sin δ), phase angle δ, complex modulus G* and elasticity modulus of asphaltene-modified asphalt binder and mastic. It is anticipated that adding 1% asphaltene would enhance viscosity, stiffness, and rutting resistance. Based on the data analysis, modified mastic viscosity and stiffness reduced. Increased asphaltene did not improve mastic to be more rut-resistance. Among the three types of asphalt binder, PG76 binder has the best rut-resistance performance, modified asphalt binder takes the second place, and 60/70 PEN has the worst rut-resistance performance. While for the mastics, PG76 mastics have the best rut resistance performance, 60/70 PEN mastics take the second place, and modified mastics have the worst rut-resistance performance. Overall, PG76 mastic had the highest complex shear modulus value (G*), rutting parameter (G*/sin), and phase angle (δ), indicating that it had the best viscosity properties, stiffness, and resistance to rutting. Therefore, it is advised to increase the asphaltene content in order to support future research.

A Biomimetic Nonwoven-Reinforced Hydrogel for Spinal Cord Injury Repair.

In clinical trials, new scaffolds for regeneration after spinal cord injury (SCI) should reflect the importance of a mechanically optimised, hydrated environment. Composite scaffolds of nonwovens, self-assembling peptides (SAPs) and hydrogels offer the ability to mimic native spinal cord tissue, promote aligned tissue regeneration and tailor mechanical properties. This work studies the effects of an aligned electrospun nonwoven of P11-8—enriched poly(ε-caprolactone) (PCL) fibres, integrated with a photo-crosslinked hydrogel of glycidylmethacrylated collagen (collagen-GMA), on neurite extension. Mechanical properties of collagen-GMA hydrogel in compression and shear were recorded, along with cell viability. Collagen-GMA hydrogels showed J-shaped stress–strain curves in compression, mimicking native spinal cord tissue. For hydrogels prepared with a 0.8-1.1 wt.% collagen-GMA concentration, strain at break values were 68 ± 1–81 ± 1% (±SE); maximum stress values were 128 ± 9–311 ± 18 kPa (±SE); and maximum force values were 1.0 ± 0.1–2.5 ± 0.1 N (±SE). These values closely mimicked the compression values for feline and porcine tissue in the literature, especially those for 0.8 wt.%. Complex shear modulus values fell in the range 345–2588 Pa, with the lower modulus hydrogels in the range optimal for neural cell survival and growth. Collagen-GMA hydrogel provided an environment for homogenous and three-dimensional cell encapsulation, and high cell viability of 84 ± 2%. Combination of the aligned PCL/P11-8 electrospun nonwoven and collagen-GMA hydrogel retained fibre alignment and pore structure, respectively, and promoted aligned neurite extension of PC12 cells. Thus, it is possible to conclude that scaffolds with mechanical properties that both closely mimic native spinal cord tissue and are optimal for neural cells can be produced, which also promote aligned tissue regeneration when the benefits of hydrogels and electrospun nonwovens are combined.

Determination of Complex Modulus Values of Low-Density Polyethylene Modified Bitumen Obtained by Using Two Different Waste Types with Artificial Neural Networks

The present study aims to solve an important environmental problem and improve the performance properties of bitumen by using two types of waste low density polyethylene (LDPE). For this purpose, two types of additives, LDPE (A) and LDPE (B), were added to the pure binder at the rates of 1%, 2%, 3% and 4% to obtain modified binders. Then, Dynamic Shear Rheometer experiments were applied on the binders under different temperatures and frequencies, and their behavior under these conditions was investigated. The complex shear modulus values obtained as a result of the experiment were estimated with Artificial Neural Network models created by training with different training algorithms. Experimental results showed that both additives increased the complex modulus values of the binder, with the LDPE (A) additive having higher complex modulus values compared to the LDPE (B) additive. In addition, it was determined that the model obtained with the Levenberg-Marquardt training algorithm gave the best results and it was concluded that the complex module values of asphalt binders can be successfully estimated using Artificial Neural Networks.

Determination of Complex Modulus Values of Low-Density Polyethylene Modified Bitumen Obtained by Using Two Different Waste Types with Artificial Neural Networks

The present study aims to solve an important environmental problem and improve the performance properties of bitumen by using two types of waste low density polyethylene (LDPE). For this purpose, two types of additives, LDPE (A) and LDPE (B), were added to the pure binder at the rates of 1%, 2%, 3% and 4% to obtain modified binders. Then, Dynamic Shear Rheometer experiments were applied on the binders under different temperatures and frequencies, and their behavior under these conditions was investigated. The complex shear modulus values obtained as a result of the experiment were estimated with Artificial Neural Network models created by training with different training algorithms. Experimental results showed that both additives increased the complex modulus values of the binder, with the LDPE (A) additive having higher complex modulus values compared to the LDPE (B) additive. In addition, it was determined that the model obtained with the Levenberg-Marquardt training algorithm gave the best results and it was concluded that the complex module values of asphalt binders can be successfully estimated using Artificial Neural Networks.

Measuring viscoelastic parameters in Magnetic Resonance Elastography: a comparison at high and low magnetic field intensity

Magnetic Resonance Elastography (MRE) is a non-invasive imaging technique which involves motion-encoding MRI for the estimation of the shear viscoelastic properties of soft tissues through the study of shear wave propagation. The technique has been found informative for disease diagnosis, as well as for monitoring of the effects of therapies. The development of MRE and its validation have been supported by the use of tissue-mimicking phantoms. In this paper we present our new MRE protocol using a low magnetic field tabletop MRI device at 0.5 T and sinusoidal uniaxial excitation in a geometrical focusing condition. Results obtained for gelatin are compared to those previously obtained using high magnetic field MRE at 11.7 T. A multi-frequency investigation is also provided via a comparison of commonly used rheological models: Maxwell, Springpot, Voigt, Zener, Jeffrey, fractional Voigt and fractional Zener. Complex shear modulus values were comparable when processed from images acquired with the tabletop low field scanner and the high field scanner. This study serves as a validation of the presented tabletop MRE protocol and paves the way for MRE experiments on ex-vivo tissue samples in both normal and pathological conditions.

Shear properties of waste glass-asphalt mastics

This study aimed at using waste glass to improve shear properties of asphalt binders. Asphalt-glass mastics were prepared at four glass/asphalt (G/A) ratios: 0.05, 0.10, 0.20, and 0.30 by volume of asphalt. The Superpave dynamic shear rheometer (DSR) was used to measure the complex shear modulus value (∣G*∣) and phase angle (δ) for the control asphalt binder and the glass-asphalt mastics using frequency sweep tests conducted at nine loading frequencies: 10, 5.0, 3.0, 1.78, 1.0, 0.5, 0.3, 0.178, and 0.1 Hz and at a wide range of temperatures: 10, 20, 30, 40, 50, 60, and 70°C. Findings of the study showed that the waste glass filler improved ∣G*∣/cos δ (elastic part), ∣G*∣sin δ (fatigue parameter), and ∣G*∣/sin δ (rutting parameter) of the asphalt binder by decreasing δ and increasing ∣G*∣ especially at lower temperatures and high frequencies. Consequently, this enhanced the rutting and fatigue resistance of asphalt binders and improved the Superpave high temperature performance grade. It was also found that the increase in the ratio of the mix to the control asphalt binder for any of these parameters and the decrease in the phase angle ratio of the mix to the control asphalt binder were statistically significant (using 0.05 significance level) at 0.30 G/A ratio. Hence, the glass can be mixed in practice with the asphalt binder to increase its stiffness and therefore the rutting resistance and to improve the asphalt binder’s elastic part as a result of the decrease in the phase angle, which will improve the fatigue resistance.

Warm Mix Asphalt Additive in Natural Rubber Modified Bitumen

The growing concern over the reduction of emissions and energy savings has led to the development of new paving technologies that are environmentally friendly. As a result, a warm mix asphalt technologies have been introduced to reduce the mixing and compaction temperature for asphalt mixture. The influence of additive with variation loading on the performance of Natural Rubber Modified Bitumen was acquired. In this work, Brookfield rotational viscometer test and Dynamic Shear Rheometer (DSR) mechanical analysis method and typical bitumen tests were employed. Results indicated that viscosity and the penetration of the Natural Rubber Modified Bitumen decreased, while the softening point increased with addition of additive. This in return would possible to reduce mixing and compaction temperature of the Natural Rubber Modified Mixture. Findings of the study also showed that the additive resulted in increase in complex shear modulus value and the rutting parameter modulus.

The Effect of Zinc Stearate Modification on Aging Characteristics of Asphalt Binder

Different types of modifiers have been investigated to improve aging characteristics of asphalt binders. In this research, the effect of zinc stearate modification has been studied on aging resistance of asphalt binder. For this purpose, viscous flow properties and other rheological characteristics of neat and modified asphalt binders have been evaluated by using conventional experimental tests and superpave protocol test. In order to evaluate rheological behavior of asphalt binder in presence of zinc stearate, a neat asphalt binder sample with three modified samples containing 0.5, 1 and 2 wt% of zinc stearate were aged by means of the Rolling Thin Film Oven Test (RTFOT). The Brookfield rotational viscosity (RV) was implemented at six different temperatures from 100 to 200 degree of centigrade. Furthermore, the dynamic shear rheometer (DSR) was used for evaluating complex modulus (G*) and phase angle (δ) of all neat and modified samples at 10, 20, 30, 40, 50 and 60°C in frequency sweep mode. To evaluate effect of adding zinc stearate by using viscosity results, proportion of asphalt binder’s viscosity after aging to its viscosity before aging was defined as viscosity aging index (VAI). Results showed that adding zinc stearate to neat asphalt binder reduces the viscosity aging index. Results of frequency sweep test indicated that zinc stearate causes the values of complex shear modulus in aging asphalt binder approach to neat state which means the effect of zinc stearate modification is positive for improving aging resistance of asphalt binder.

Magnetic resonance elastography inversions: Technical challenges and recent developments

Magnetic resonance elastography (MRE) is a phase contrast based MRI imaging technique that can quantitatively and non-invasively measure full 3D vector displacement data from propagating acoustic waves in vivo. The data acquired allow the calculation of local values of complex shear modulus and the generation of images that depict the viscoelastic properties of tissue. Acquisitions at different frequencies can capture the dispersive behavior of these quantities, and advanced approaches attempt to map anisotropic and poroelastic properties of materials. We will discuss current approaches for the inversion of MRE data, focusing on the issues and assumptions involved, and highlight some of the challenges faced in such inversions, particularly in thin or small structures in which wave propagation is dominated by waveguide effects. We will also present results based on neural network inversions, which may have lower repeatability error and be more resistant to noise than some current approaches.

Research on properties of bio-asphalt binders based on time and frequency sweep test

Bio-asphalt is a binding agent that is made of bio-oil and petroleum asphalt, or bio-oil modified with incorporations of some other additives under certain conditions. This study was carried out to evaluate the properties of bio-asphalt binder-based in terms of the value of complex shear modulus (G∗) and the phase angle (δ) tested by dynamic shear rheometer (DSR). Four bio-oil dosages of 5, 10, 15, and 20% based on the weight of asphalt (S100) were used to alter the SBS-modified binder. Whereby, the SBS content is approximately 1% of the weight of the virgin asphalt. The complex shear modulus and frequencies of virgin and short-term aged binders were tested. The master curves of rutting factor (G∗/sinδ) of different bio-asphalt were then generated to survey its rheological properties in a broad range of frequencies and temperatures. Based on the results, it was found that the addition of bio-oil extracted from sawdust has significantly increased the complex shear modulus of asphalt binder at the same frequency conditions after going through rolling thin film oven (RTFO), which is desirable for rutting prevention of asphalt mixtures. The rheological properties of bio-binders are more susceptible to the RTFO aging condition compared to the reference binder. The master curve of rutting factor of bio-binder indicated that the rutting factor of bio-asphalt increased with the increase of frequency before and after RTFO. Additionally, incorporations of bio-oil into the SBS modified asphalt, has greatly increased the rutting factor (G∗/sinδ) after RTFO, regardless of the loading frequency. However, the degree of enhancement was dominated by the percentage of bio-oil and aging condition.

A new simplified micromechanical model for asphalt mastic behavior

This study presented a new simplified micromechanical model that describes the asphalt mastic behavior at intermediate and high temperatures. Asphalt mastics were prepared using four fillers: glass, limestone, stone sawdust, and medical ash and one asphalt binder with a penetration grade of 60/70 (PG64-10). The mastics were prepared at four volume concentrations: 0.05, 0.10, 0.20, and 0.30. The Dynamic Shear Rheometer (DSR) frequency sweep tests were conducted at a wide range of temperatures and loading frequencies. A new model was developed for the mastic complex shear modulus value with a simplified form Gm=AGbB, such that A is a quadratic polynomial function of the volume concentration. The model had a high adjusted coefficient of determination (R2). It was validated using external measured data, and showed improved predictions of the mastic behavior. Findings also showed that the stone sawdust asphalt mastic had the highest complex shear modulus value at volume concentrations 0.05 and 0.10; whereas, at higher volume concentrations (0.20 and 0.30), the medical ash asphalt mastic and the glass asphalt mastic had the highest values, respectively. The stiffening effect of the asphalt mastics increased with the increase in temperature and the decrease in loading frequency.

A universal data quality assessment method for human brain magnetic resonance elastography using an elastic spherical phantom

Human brain Magnetic Resonance Elastography (MRE) is on the verge of being utilized as a clinical diagnostic tool. Several methods are being investigated at multiple clinical facilities; however each have different ways of introducing vibrations into the brain and processing image data. These differences result in dissimilar complex shear modulus values, which make it difficult to reproduce and report brain tissue mechanical properties across the research community and in longitudinal clinical studies. Human brain MRE Data Quality Assessment (DQA) reporting methods are needed. This study investigates a universal method to regulate the precision and accuracy of MRE independent of the vibration system and post processing technique. A thin-walled 15.2 cm diameter acrylic sphere was filled with silicone gel. The phantom is designed to mimic human head, neck, and torso mechanics during human brain MRE scanning and is compatible with most brain vibration methods. MRE-derived storage shear modulus yields approximately 1.5 kPa (60 Hz vibration) using a custom air pillow system (Resoundant, Inc.). The material will be cross validated with rheometry for further validation. This study provides insight on design characteristics for a standard DQA phantom for regulating the quality of human brain MRE for research reporting and in the clinic.

Evaluation of Bituminous Binder in Relation to Resistance to Permanent Deformation

Bituminous binders are thermoplastic liquids which behave as viscoelastic materials. Their deformation behavior can be determined by rheological parameters. The changes of both viscous and elastic properties with temperature and time are measured as the response of the material to deformation by periodic forces. The paper presents the most used parameters and rheological properties for the characterization of the rutting resistance of bituminous binders and asphalt mixtures. Rheological properties (G*, δ, η*) are determined for four bituminous binders (unmodified and polymer modified) at temperature 46 – 60 oC (80 oC). And resistance to deformation of asphalt concrete mixtures is determined by rutting test. The higher value of complex shear modulus, the stiffer bituminous binder is able to resist deformation.

Dynamic Mechanical Properties of PEG 4000 + Quartz Composites

The complex shear modulus of polyethylene glycol (PEG) 4000 + quartz compositesas a variation of processing temperature and applied temperature has been investigated using a Dynamic Mechanical Analysis (DMA) instrument. The quartz, obtained by processing silica sand from Tanah Laut, South Kalimantan, of as much as 40% by weight was used as the filler of the composite. The processing temperature was room temperature, 50°C, and 70°C after considering the theoretical melting point of PEG 4000. Results showed that such temperaturesgave several phenomena related with the complex modulus values from the pure PEG 4000 and the composite, i.e.they dropped with time indicating the presence of relatively rapid strain relaxation and were in the range of 50-300MPa. Furthermore, theaddition of quartz improved the values wherethe most improvement occurred on the 70°C sample,i.e. almost twice from the pure PEG 4000. Increasing the heating process, however, significantly reduced the values. The reduction was confirmed by further investigation where the result showed that the complex shear modulus value both in the pure PEG 4000 and the composite dropped with applied temperature at around 42°C and 45°C, respectively, whichcan be related to the melting PEG. A severe drop was particulartly observed in the composite which was believed caused by the addition of quartz in a lose powder form.

The Effect of Polyethylene Terephthalate Particle Size and Concentration on the Properties of Asphalt and Bitumen as An Additive

Research is extremely limited on the combination of polymeric materials, such as discarded polyethylene terephthalate (PET), with asphaltic materials indigenous to Trinidad and Tobago. This paper examines the effect of both concentration and particle size of added PET on the rheological properties of Trinidad Lake Asphalt (TLA) and Trinidad Petroleum Bitumen (TPB). The PET particle size ranges under study were >0.30 mm to 0.60 mm, >0.60 mm to 0.85 mm, and >0.85 mm to 1.18 mm. These particle sizes were added in concentrations by weight ranging from 2% to 8% PET for TPB and 2% to 4% PET for TLA. Incorporating the waste polymeric material PET in TLA and TPB influenced the physical properties of the resulting blends. For TLA-PET blends, the largest particle size range produced values of complex shear moduli that were higher than pure TLA. The smallest particle size range had the opposite effect. The optimal concentration for fatigue cracking and rutting resistance occurred at 2% PET with the largest particle size range. For TPB-PET blends, the peak value of complex shear modulus generally occurred at concentrations above pure TPB for all particle size ranges and temperatures tested. As the particle size range increased, these peak values occurred at lower concentrations of PET. The 2% concentration for the largest particle size range provided the best fatigue cracking resistance, whereas the particle size range >0.60 mm to 0.85 mm produced the best rutting resistance. This study demonstrated that incorporating waste PET as an additive in road paving mixtures could improve the overall quality of roads and also be a sustainable waste disposal option. Further research is recommended on the effect of PET particle size range and concentrations on TLA/TPB combinations commonly used in road paving applications along with accelerated weathering studies.

Investigation of the effect of rubber on rheological properties of asphalt binders using superpave DSR

The main objective of this study was to investigate the effect of the rubber additive on the rheological properties of asphalt binders including Superpave rutting parameter, fatigue parameter, storage modulus at six rubber percentages: 0.0, 2.5, 5.0, 7.25, 10, and 15%. The Superpave Dynamic Shear Rheometer (DSR) was used to measure the complex shear modules value and the phase angle for the fresh asphalt binder and the rubber-modified asphalt binders using DSR strain-controlled tests. The DSR tests were conducted at one loading frequency of 10 rad/sec (1.59 Hz) and five temperatures: 58, 64, 70, 76, and 82°C. A 12 percent constant strain was applied in these tests according to the Superpave specifications. The rubber additive improved the complex shear modulus value of asphalt binder at all temperatures. Findings of the study showed that the rubber additive resulted in an increase in each of: the complex shear modulus value, the rutting parameter, the fatigue parameter, and the storage modulus (|G*|, |G*|/sin δ, |G*|sin d, and |G*|cos δ, respectively) of the asphalt binder. In conclusion, the rubber additive improved the rutting resistance as well as the fatigue resistance of the asphalt binder by increasing the complex shear modulus value and the storage modulus, and decreasing the phase angle.

Correlation of morphology and rheological response of interfacially modified PTT/m-LLDPE blends with varying extent of modification

Morphology and rheology of poly(trimethylene terephthalate)/metallocene linear low-density polyethylene (PTT/m-LLDPE) immiscible blends with varying extent of compatibilization were experimentally examined and theoretically analyzed using Palierne and Coran models. A glycidyl methacrylate-based terpolymer was used to modify the interface of the blend. The particle radius in the PTT75/m-LLDPE25 system decreases in proportion to the level of added compatibilizer up to 5 wt% of terpolymer, beyond which the particle size remains unchanged. This is attributed to the saturation of interface by interfacial modifier leading to diminish the effectiveness of the compatibilizer. Morphological observations reveal that the saturation of the interface for PTT25/m-LLDPE75 system occurs at 2.5 wt% compatibilizer content. Rheological examinations show a sharp reduction of complex viscosity for the latter system at 10 wt% terpolymer which is ascribed to the micelle formation in the bulk phase. Plots of the relaxation time spectrum exhibit that upon addition of the compatibilizer the magnitude of the relaxation peaks associated with interface increases which is ascribed to the increase of the interfacial area. The Palierne model fails to predict admissible values and reasonable trend for interfacial tension. This failure is believed to be due to the excessively large difference between the complex shear modulus values of the dispersed and matrix phases. However, the Coran model used to describe the dynamic moduli, shows a good fit to the experimental data.