DMA Results Research Articles

Experimental investigation of mechanical, tribological and dielectric properties of alumina nano wire-reinforced PEEK/PTFE composites

The main objective of the present research work was to evaluate dielectric, mechanical and tribological properties of alumina nanowire with PEEK/PTFE thermoplastic composite. In this work, the effect of reinforcement of PEEK (Polyetheretherketone) with 10% by wt, PTFE (Polytetrafluoroethylene) blend reinforced with 5 wt% of nano-sized alumina nanowire were studied. The composites stocks were fabricated through twin-screw extruder and injection moulding machine and characterized by LCR meter and universal testing machine. In this investigation, the tribological behaviour of polyetheretherketone (PEEK), polytetrafluoroethylene (PTFE) blends filled with alumina nanowire are investigated under different contact loads with constant sliding speed and time using a pin on disc tribometer. The dielectric constant and loss of the PEEK/PTFE reinforced 5wt% of alumina nanowire gives a very close reading with actual PEEK at lower frequency and temperature, which indicated effective charge transfer prevention of nano-silica wire. It is observed that at higher temperature and frequency the dielectric constant improved by 20%. The experimental results demonstrated that the coefficient of friction is significantly influenced by the increase of filler type and load for all samples. Very low COF of 0.2 was observed for PEEK composite contain 10 wt% of PTFE and 5wt% of alumina nano-wire. The DMA results revealed improved storage modulus for PEEK composite contain 10 wt% of PTFE and 5wt% of silica nano-wire. The SEM morphological images revealed that homogeneous blending of PEEK/PTFE and uniform dispersion of alumina nanowire.

Synthesis and characterization of asymmetric bismaleimide oligomers with improved processability and thermal/mechanical properties

Novel asymmetric bismaleimide (BMI) oligomers with different molecular weights and dianhydrides were designed and synthesized by 3,4′‐oxydianiline (3,4′‐ODA), 2,3,3′,4′‐oxydiphthalic dianhydride (a‐ODPA), and 2,3,3′,4′‐biphenyltetracarboxylic dianhydride (a‐BPDA). The chemical structures of BMI oligomers were confirmed by Fourier transform infrared spectrometry (FTIR) and gel permeation chromatography (GPC). X‐ray diffraction (XRD) exhibited broad peaks, suggesting amorphous structures. Heat flow curves of oligomers measured by differential scanning calorimeter (DSC) displayed wide processing window due to low glass transition temperatures (Tg). BMI oligomers exhibited high solubility in common organic solvents. Particularly, the OD‐BMI‐1 oligomer exhibited excellent solubility of more than 50 wt% in DMAc solvent. Tg value and minimum complex viscosity of OD‐BMI‐1 oligomer were only 121 °C and 8.1 Pa · s, respectively. The cured BMI resins possess high thermal and thermal‐oxidative stability. The Tg and the temperature of 5% weight loss in nitrogen were above 256 and 449 °C, respectively, and the residual weight percentages at 800 °C were all >49%. Moreover, films made of BMI resins exhibited excellent mechanical properties flexibility, as confirmed by photograph and DMA results of films. The elongation at break of the prepared films was found to be high (almost >9.6%). POLYM. ENG. SCI., 59:2265–2272, 2019. © 2019 Society of Plastics Engineers

Characteristics of HDPE/cardboard dust 3D printable composite filaments

Abstract In the field of 3D printing, new composites made from blends of natural materials and synthetic polymers have been emerging. In this research, 3D printable composite filaments made with the addition of 20, 50 and 75 wt% cardboard dust to HDPE polymer were analyzed. The influence of including cardboard dust into polymer matrix on the technological, morphological and mechanical properties of filaments was investigated. The addition of 20 wt% cardboard dust had a negligible influence on the diameter and density of the filament. Adding larger quantities of cardboard dust resulted in a substantially larger diameter and essentially lower density. SEM image analysis confirmed high porosity and nonuniformity of the structure. The FTIR spectra analysis revealed a decrease in crystallinity with increased content of cardboard dust present in the filament. According to DMA results, glass transition temperature (Tg) and storage moduli (E') of samples decreased with increased percentage of cardboard dust in HDPE matrix. In the filaments, loss moduli (E”) were low and peaks relatively undistinctive; composite filaments were hence less prone to a plastic deformation than pure HDPE filament. They also showed higher values of tan δ, which suggested a more intensive movement of structural elements and higher ability of damping. The mechanical properties declined; elastic moduli, tenacity, strain and stiffness of filaments lowered already at the addition of 20 wt% cardboard dust. Adding 50 and 75 wt% cardboard dust led to much lower tenacity and toughness, low deformability, resulting in the brittleness of filaments. Nevertheless, it was also established that 3D objects could be printed even with 50 wt% cardboard dust/HDPE filament. The research showed that the production of 3D printable composite filaments is feasible; however, the quantity optimization of fillers which is blended with HDPE polymer to reach good mechanical properties is required.

In Situ Vibrational Probes of Epoxy Gelation.

This paper presents an efficient way to measure the curing kinetics and gel point, αgel, in epoxy resins from one single experiment. The epoxy curing reaction is herein monitored using in situ and time-resolved near-infrared absorption spectroscopy (NIR). The curing profiles over different isothermal conditions are in good agreement with DSC. Furthermore, the increase of the NIR absorption bands of aromatic rings (unreactive throughout curing) probe the cure shrinkage, as more and more aromatic rings are localized within the fixed sample volume. Therefore, the gel point is determined using the onset of the aromatic absorption increase. The results are in good agreement with the theoretical gel point, as well as DMA results. This innovative approach enables gelation measurements on epoxy neat resins and film composites with an easy-to-perform, accurate, robust, and versatile method.

Investigation of Photodegradation Preventing of Polyvinyl Alcohol/Nanoclay Composites

The effects of UV irradiation on chemical, thermal, mechanical, and morphological properties of polyvinyl alcohol (PVOH)/2 wt.% of nanoclay(NC) filler were investigated. PVOH composite films were prepared from PVOH blend with fixed content (2%) of NC via the solution casting method. Pure PVOH and PVOH composites were exposed to 340 nm fluorescent UV lamps and assessed for 50 h, 100 h, and 200 h UV exposue. The experimental results such as Fourier transform infrared (FTIR) confirmed that 2% wt. NC filler is efficient and can resist chemical degradation that is caused by ultraviolet irradiation (UV). The carbonyl and hydroxyl indices were increased with increasing the UV exposure irradiation times of both PVOH and PVOH composite. However, the PVOH nanocomposites exhibited more resistant to increasing the indices after exposure to UV irradiation with a longer exposure time. The thermal results (TGA) indicated that PVOH nanocomposite is exhibited more resistance to thermal degradation after UV irradiation exposure compared to that of pure PVOH sample. From DMA results, the storage of modulus was reduced after exposure to UV irradiation of PVOH and PVOH nanocomposites. The results of Tg of PVOH nanocomposites increased after the incorporation of 2% wt. NC into PVOH after exposure to UV irradiation. PVOH nanocomposite exhibited more resistance to reduce the tensile strength after exposure to 200 h UV irradiation. XRD tests showed that PVOH/2 wt.% NC nanocomposites have more resistant to increase intensity after exposure to 200 h UV irradiation compared to that of PVOH sample. The morphology micrographs showed that no obvious cracks on the PVOH nanocomposite after UV irradiation exposure by comparing to that of pure PVOH.

Effect of reactive group types on the properties of poly(ethylene octane) toughened poly(lactic acid)

In this work, maleic anhydride (MA) and glycidyl methacrylate (GMA) grafted poly(ethylene octane) (MPOE and GPOE) were used to toughen poly(lactic acid) (PLA). Results exhibited that the MA and GMA strongly influenced the morphology and mechanical properties of PLA. The stronger interfacial reactions between the carboxyl and/or hydroxyl of PLA and epoxy groups of GPOE induced smaller dispersed phase sizes and higher impact strength than that of PLA/MPOE blends. SEM results showed that the shear yielding properties of the PLA matrix and cavitation of rubber particles were major toughening mechanisms. Rheological investigation indicated that the PLA/GPOE blends had higher storage modulus and complex viscosity at low angular frequencies range due to the high interfacial adhesion between PLA and GPOE. The results of DMA showed that all the PLA blends had lower storage modulus due to the low stiffness of the elastomers. Compared MPOE, the addition of GPOE significantly decreased the cold crystallization and melting temperature which indicated that GPOE could enhance the crystalline ability of PLA.

Antibacterial activity of sustainable composites derived from epoxidized natural rubber/silver-substituted zeolite/poly(lactic acid) blends

Sustainable composites derived from epoxidized natural rubber (ENR)/silver-substituted zeolite (AgZ)/poly(lactic acid) (PLA) blends possessing antibacterial activity were reported. ENR, herein, acted as an antibacterial promoter providing more hydrophilicity to the composites and facilitating water diffusion. Two methodologies were used to prepare composites, including solution casting (S) as well as solution casting followed by roll milling (SR). Both composites were compared in terms of morphology, AgZ dispersion, water absorption, and antibacterial activity. The shift of Tg and tan δ toward lower temperature of PLA composites consistently confirmed the compatibility between ENR and PLA by DSC and DMA results, respectively. The good AgZ distribution was observed in composites-SR, as confirmed by SEM/EDX. The results of agar disk diffusion susceptibility test showed that PLA, AgZ/PLA, and even ENR/AgZ/PLA composites-S showed no or less inhibition zone; meanwhile, ENR/AgZ/PLA composites-SR showed the significant inhibition zone against both Escherichia coli and Staphylococcus aureus. Besides, the antibacterial activity of the composites was required at least 5 wt% of AgZ. More than 98% inhibition of S. aureus growth by the composites-SR was observed during 2–24 h of cultivation, whereas AgZ/PLA provided the highest inhibition of only 75% at 24 h of cultivation. Hence, the incorporation of ENR enhances the bactericidal activity of the composites. In terms of mechanical properties, incorporating ENR into the composites decreased tensile modulus and strength, but increased the impact strength significantly. Therefore, the developed composites could be promising materials in food and biomedical fields in which antibacterial and impact resistance properties are required.

Triacetin as a Secondary PVC Plasticizer

The use of biobased plasticizers with low toxicity and good compatibility with polyvinyl chloride (PVC) has become more attractive in the recent years in contrast with phthalate derivatives. In this study, a glycerol derivative plasticizer (triacetin—TAG) was tested as a secondary plasticizer for PVC. TAG was added to PVC formulations from 10 up to 20 phr. The increase of the plasticizer content had a great influence on the properties of PVC samples. The good miscibility and therefore the efficient plasticization action of the TAG were supported by DMA results, since narrow peaks of tan (δ) curves and reduction of the Tg values for the samples were observed. The ensuing PVC demonstrated good rheological properties and thermal stability up to 200 °C. Finally, the presence of TAG reduces the hardness of materials and does not increase their density.

Synthesis of a benzoxazine-type dispersant and its application on epoxy/benzoxazine/ZrO2 composite: Dispersion performance and tensile behavior

Abstract Firstly, a benzoxazine-type silane coupling agent (BS) was synthesized using 3-aminopropyltriethoxysilane (KH-550), 3-N-pentadecylphenol and paraformaldehyde. Subsequently, modified amorphous zirconia (ZrO2) nanoparticles (NPs) were obtained through sol-gel method in ethanol with zirconium-butoxide (Zr(OBu)4) and the synthesized BS as dispersant. FTIR spectra confirmed the existence of BS structure on the surface of the synthesized ZrO2 particle. The results of DLS showed that the modified NPs possessed small particle size of 20–70 mm with low polydispersity index and stable dispersion performance which was consistent with the morphology observed in TEM. The zeta potential was proportional to the addictive BS amount and reached the maximum when the BS loading rate was 30 mol%. Bisphenol A epoxy resin (DGEBA) was cured with Bisphenol A benzoxazine and the modified ZrO2 NPs were incorporated to prepare the epoxy/benzoxazine/ZrO2 composite. Homogeneous dispersion of the modified NPs was observed in the cured composite which was in deep contrast with the unmodified one. The results of tensile test showed that the cured polymer with the BS modified NPs possessed promoted tensile strength. The maximum of tensile strength was 105.7 MPa derived from the BS3-3 group while that for the U3 group with the same content of unmodified ZrO2 NPs was just 73.5 MPa. The critical point of the tensile stress moved toward higher NPs content for the composites including the BS modified NPs and the standard deviation of the results, especially for the tensile stress, decreased remarkably which mean more stable mechanical behavior. DMA results were in good consistence with the tensile test that the composites with the BS-modified NPs possessed higher glassy modulus and Tg value.

Methyl Acetyl Ricinoleate as Polyvinyl Chloride Plasticizer

The use of alternative plasticizers with low toxicity and good compatibility with polyvinyl chloride (PVC) has become more attractive in the recent years in contrast with the phthalate derivatives. In this study, an additive derived from castor oil (methyl acetyl ricinoleate—MAR) was tested as a plasticizer for PVC. MAR was added to PVC in a range of 50–90 PHR and the increase of the plasticizer content had a great effect on maximum tension and tension at 100% of PVC samples. Moreover, the elongation at break also increased with the increase of plasticizer content. The good miscibility with PVC and therefore efficient plasticization action of MAR were proved by the DMA results, since narrow peaks of tan (δ) curves were observed. Moreover, the increase of MAR content reduced the Tg values of the samples [from 8.2 °C (50 PHR) to − 25.6 °C (90 PHR)]. PVC samples obtained using this bio-based plasticizer demonstrated good rheological properties [the increase of plasticizer content increased the MFI from 3.977 (50 PHR) up to 44.244 g.10 min−1 (90 PHR)] and proved to be thermally stable up to 200 °C. Finally, the MAR PVCs presented lower densities and lower hardness when compared with those produced from traditional plasticizes which are important aspects for the manufactories and consumers of PVC. In that sense, MAR proved to be a suitable plasticizer for PVC which may find a broad range of applications in the electric wires, carpets, hoses, shoes and construction industry, among many others.

Fabrication of hemicelluloses films with enhanced mechanical properties by graphene oxide for humidity sensing

An effective and green method to incorporate graphene oxide into quaternized hemicelluloses to form a hemicelluloses based film was introduced in this study. Tight, homogeneous, and smooth surfaces of the film were obtained from the SEM image. Data on the mechanical properties of the films indicated that the hybrid films prepared from QH and GO (component of GO was 4.8%) exhibited a high tensile strength of 43.83 MPa. This finding suggested that addition of GO contributed to the desirable mechanical properties of the hybrid film. The hybrid films exhibited high sensitivity to humidity; they could be bent spontaneously under wet conditions within seconds and stretched under dry conditions. In addition, the results of DMA indicated that the storage modulus of the hybrid films had an order of magnitude change in value at different humidities. These characteristics show that films can be potentially used in bio-medicine, packaging materials, and humidity sensors.

Designing and Preparation of Fiber-Reinforced Composites with Enhanced Interface Adhesion.

The interfacial properties between fibers and resin matrices show great influence on the properties of fiber-reinforced composites. In this work, phthalonitrile containing benzoxazine (BA-ph) was chosen as the resin matrix, which combined with the glass fiber (GF) to prepare reinforced composite laminates at low temperature (200 °C). The poly(arylene ether nitrile) (PEN) was used to modify the GF and BA-ph matrix. Curing behaviors of the BA-ph/PEN were investigated with Differential scanning calorimetric (DSC) and Dynamic rheological analysis (DRA), and results indicated that the polymerization would be hindered by PEN due to the dilution effects. Moreover, the formation of triazine rings which assigning to the ring-forming polymerization of nitrile groups in BA-ph and PEN could improve the compatibility of BA-ph and PEN in the matrix. The SEM images of the fracture surface of the composites revealed that the brittleness of BA-ph matrix and interfacial adhesion between GFs and matrix was improved. The enhanced interfacial adhesion was detailedly discussed from the perspective of physical entanglement and the copolymerization between PEN chains on the surface of GFs and BA-ph/PEN matrix. The results of DMA also explained the toughness of BA-ph/PEN matrix, the semi-interpenetrating polymer networks and the interfacial adhesion. In sum, a feasible strategy that modifies the surface of GFs and the brittleness of the thermosetting matrix by high-performance thermoplastic polymers, which can be employed to prepare the composite laminates with improved properties.

Effects of Palm Waste Filled Thermoplastic Composites on Dynamic Mechanical Analysis

The effects of palm waste (palm slag and palm ash) filled thermoplastic (high density polyethylene (HDPE) and recycled HDPE (rHDPE)) composites on dynamic mechanical analysis were examined. Two different particle size (150 μm – 300 μm) as coarse size and (≤ 75 μm) as fine size were used in this study. The palm waste of HDPE and rHDPE with 8 different types of sample were prepared using a twin screw extruder. 10 % of filler loading was chosen to produce the composite. The DMA result indicated that the fine size palm ash and coarse size palm slag have highest storage modulus incorporated with rHDPE composite meanwhile the effect of palm slag incorporated with HDPE also shown the similar findings as palm ash incorporated with HDPE. The loss modulus indicated that the coarse size of palm slag shows the lowest value and virgin HDPE gained the highest value after 90 °C in HDPE composite meanwhile fine size of palm ash and coarse size of palm slag both indicates the highest value when incorporated with rHDPE composite. For tan δ there are no significant differences recorded between the palm waste filled HDPE composite where virgin HDPE show the highest value. Meanwhile coarse size palm slag composite recorded the nearly identical tan δ value of rHDPE as the highest filled rHDPE composite. Conclusively, fine size palm ash and coarse size palm slag show the better viscoelastic properties in rHDPE composite.

Effect of containing polyhydric alcohol liquefied wood on the properties of thermoplastic polyurethane resins

Polyurethane (PU) is one of the most important synthetic resins which have been widely used in various industries. Most of the PU resins are prepared by reacting isocyanate with polyols. Polyhydric alcohol liquefied biomasses are rich in hydroxyl groups and are considered having the potential to be a raw material for preparing PU resins. In this study, wood of Japanese cedar (Cryptomeria japonica) was liquefied in polyethylene glycol/glycerol co-solvent with H2SO4 as a catalyst at 150 °C for 60 min. After being cooled, the liquefied product was diluted, neutralized, filtered and vacuum distilled to obtain the liquefied wood (LW). Thermoplastic PU resin (TPU) containing LW was prepared by reacting a mixture of polytetramethylene ether glycol (PTMG) and LW with different OH/OH molar ratios with 1,6-hexamethylene diisocyanate (HDI), using 1,4-butanediol as a chain extender. The influence of the amount of LW on the molecular structure, mechanical and thermal properties of TPU was investigated. FTIR analysis shows that LW-containing TPU, referred to as LWTPU, has more hydrogen bonding than neat TPU. Resin films made from LW-TPU prepared with a mixture of PTMG/LW with an OH/OH molar ratio of 80/20 and 65/35 have higher tensile strength and less breaking elongation than that of neat TPU. DMA results show introducing LW leads to TPU films being more rigid. TGA results show the thermal stability of TPU films can be enhanced by LW before the temperature reaches 350 °C.

Synthesis and properties of phthalonitrile terminated polyaryl ether nitrile containing fluorene group

ABSTRACTA series of phthalonitrile terminated polyaryl ether nitrile oligomers containing fluorene group (BPPENs) were synthesized and cured in the presence of bis[4‐(4‐aminophenoxy)phenyl]sulfone. Additionally, the quartz fiber reinforced composites were prepared by hot‐pressing process. The structure of oligomers was characterized by 1H‐NMR and GPC. The curing behavior of BPPENs was studied by DSC, IR, and rheological tests in detail. Thermal stability and mechanical properties were also investigated. The results showed that the oligomers showed excellent solubility. BPPENs could be dissolved in common solvents at ambient temperature. TGA and DMA results showed that the cured polymer and composites possessed excellent thermal properties with high residual weight of 72.4% at 1000 °C and 5% thermal degradation temperature (T5%) of 548 °C under inert atmosphere. The bending strength of quartz fiber reinforced composites was about 500 MPa, exhibiting good mechanical property. The products could be used as high performance polymers or a modifier for heat‐resistant resins. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46606.

Effect of crystallinity on CF/PPS performance under weather exposure: Moisture, salt fog and UV radiation

Abstract The crystalline content of a composite can affect its performance under environmental conditions. The objective of this study is to evaluate the influence of the crystallinity degree of CF/PPS composites to hygrothermal, salt fog and ultraviolet/condensation conditioning. DSC and DMA results, and Young's modulus and ILSS values were used to evaluate the changes in the thermal and mechanical properties of CF/PPS composites after conditioning. The crystallinity degree showed to affect the water uptake and the severity of degradation. Differences up to 40% were found among the mechanical properties values depending on the crystallinity. In the hygrothermal and salt fog conditioning the least crystalline laminates were mostly degraded. In contrast, in the ultraviolet/condensation conditioning the composites with the highest crystalline contents were more affected.

Construction of chelation structure between Ca2+ and starch via reactive extrusion for improving the performances of thermoplastic starch

Abstract A novel strategy was developed for the fabrication of thermoplastic starch with improved thermal and mechanical properties via chelating between starch and calcium gluconate (CG). Herein, the chelation structure between Ca2+ and hydrogen group in starch was constructed via reactive extrusion. CG (5–20 wt% based on starch) was added to the mixture (corn starch (CS) and glycerol (70:30 wt%)), then the mixtures were extruded by twin-screws extrusion to fabricate thermoplastic CS/CG (TPS-CG). FT-IR and XPS test were employed to confirm the chelation structure of CS/CG. TGA and TG-FTIR results demonstrated that chelation structure improved the thermal stability of CS/CGs, while reduced the amount of toxic volatile gas from the CS decomposition. The results of DMA, mechanical and rheological tests for TPS-CGs revealed that all the data increased when CG content ranged from 5% to 20%. The maximal increase in glass-transition temperature, notched impact and tensile strength, melt viscosity of TPS-CGs was 20 °C, 52.4%, 44.2% and 360%, respectively. The mechanism for these improvements and their variations by CGs content were attributed to improving the entanglement of starch molecular chain and the stiffness of TPS-CGs via the chelation structure. The study provided a convenient solution for TPS fabrication with satisfied properties.

Synthesis and characterization of waterborne polyurethane based on aliphatic diamine sulphonate and liquefiable dimethylol propionic acid

Abstract In this paper, aliphatic diamine sulphonate (AAS-Na) and liquefiable dimethylol propionic acid (LDMPA) were used together to synthesize waterborne polyurethane (WPU) with excellent property. The influence of -COOH/-SO 3 Na molar ratio on the structure and properties of the waterborne polyurethanes were characterized by IR, particle size analysis, DSC, DMA, apparent viscosity, water absorption, contact angle, tensile and peel strength tests. It was found that with decreasing -COOH/-SO 3 Na molar ratio from 10:0 to 3:7, (1) the particle size of the waterborne polyurethane emulsion decreased, while the apparent viscosity of the samples increased. (2) the water absorption of the WPU films decreased, while the contact angle of the films increased. (3) The tensile strength, elongation at break and peel strength of the samples increased. Furthermore, the results of DMA showed that incorporation of AAS-Na increased the storage modulus of the sample. And the results of DSC showed that with decreasing -COOH/-SO 3 Na molar ratio from 10:0 to 3:7, T g of soft segment shifted to lower temperature, which indicated that the micro-phase separation degree of the samples increased.

Comparison of yields and properties of microbial polyhydroxyalkanoates generated from waste glycerol based substrates

The accumulation efficiency and the properties of polyhydroxyalkanoates (PHAs) produced from acidified waste glycerol (AWG) and its derivatives via an enriched microbial consortium derived from soil, were investigated in this study. AWG consisted mainly from short chain fatty acids, 1,3 propanediol and residual glycerol, which were also evaluated individually as substrates. Accumulation capacity and yields were estimated after solvent extraction and purification and PHAs were further analyzed in terms of their chemical structure, thermal properties, molecular masses and mechanical properties. The lowest accumulation capacity was noticed for non-acidified waste glycerol as carbon source which led to the generation of P(3HB), whereas for the other carbon sources co-polymers of 3HB with 3HV or 3HHx were produced. Average molecular mass weights were quite high in all cases reaching ~1.8×106Da. The thermal properties and the mechanical behavior of PHAs were shown to be highly affected by their monomeric composition, whereas it was also concluded that DSC and DMA results were in good agreement.

Dynamic mechanical analysis and crystalline analysis of hemp fiber reinforced cellulose filled epoxy composite

Abstract The Dynamic mechanical behavior of chemically treated and untreated hemp fiber reinforced composites was investigated. The morphology of the composites was studied to understand the interaction between the filler and polymer. A series of dynamic mechanical tests were performed by varying the fiber loading and test frequencies over a range of testing temperatures. It was found that the storage modulus (E’) recorded above the glass transition temperature (Tg) decrease with increasing temperature. The loss modulus (E”) and damping peaks (Tan δ) values were found to be reduced with increasing matrix loading and temperature. Morphological changes and crystallinity of Composites were investigated using scanning electron microscope (SEM) and XRD techniques. The composites with Alkali and Benzoyl treated fibers has attributed enhanced DMA Results. In case of XRD studies, the composites with treated fibers with higher filler content show enhanced crystallinity.