Higher Tensile Modulus Research Articles

Fiber Extraction and Characterization from Typha Domingensis

ABSTRACT In recent years, the use of natural fibers has become highly popular in industrial textile applications. Typha domingensis (TD), a naturally growing plant under wetland conditions characterized by its high-quality leaf and seed fibers. An attempt was made to extract and characterize fibers from its leaves and seeds by water retting. The fibers obtained from the leaves were continuous, more than 0.9 m long, possess high tensile strength and modulus whereas, seed fibers were feathery and porous. The morphological, mechanical, chemical properties, and crystalline structure of both the fibers were analyzed. The scanning electron microscopic studies showed that typha fiber surface is smooth, fine, and circular in cross-section. The crystalline and chemical properties were very close to that of cellulosic fibers. This research has shown the possibility of using biodegradable TD leaf and TD seed fibers in the manufacturing of technical textiles and composites.

Effect of equilibrium pH on the structure and properties of bleach-damaged human hair fibers.

Hair proteins are significantly affected by environmental pH. This impact tends to increase with prior hair damage. To understand how pH affects bleached hair properties, we utilized a number of techniques allowing for the determination of hair thermal properties, swelling and water sorption, and dry and wet tensile properties. At pH 5, hair proteins had the best structural integrity, as determined by differential scanning calorimetry and the highest tensile modulus. At pH 10, protein cross‐linking density decreased, water content and hair cross‐sectional diameter increased. Alkaline treatment, when compared with pH 5, did not reduce intermediate filament conditions (evaluated via enthalpy measurement) nor mechanical property performance in the wet state. In contrast to alkaline‐treated hair, bleached hair equilibrated at pH 3 behaved very differently: it contained two different crosslink density zones, was the least stiff in dry and stiffest in wet conditions. Additionally, it absorbed less water and had the lowest diameter because of reduced water binding by protonated carboxyl groups. The pH 3 to 10 did not affect the mechanical strength of bleached hair in dry or wet conditions.

Microfibrillated cellulose from sweet sorghum (Shorghum Bicolor (L.) Moench) fiber by twin screw extruder and its charateristics on polylactic acid biocomposites

High tensile strength and modulus could be obtained by microfibrillated cellulose (MFC) addition into PLA matric. MFC production from sweet sorghum fiber with twin screw extruder (TSE) could be an effective mechanical treatment. The objective of this research is to study the effectivity of twin screw extruders for MFC production from sweet sorghum fiber and to analyze its effect on PLA biocomposites properties. Sorghum fiber was firstly delignificated with alkaline treatments and bleached with sodium peroxide solution to produce high cellulose content of fiber. Bleached sorghum fiber was then passed through into TSE for 1, 3, and 5 passes. Afterward, PLA biocomposites with MFC from TSE process were produced by the solvent casting method. Twin screw extruder with co-rotating intermeshing flow is effective for defibrillation and size reduction of cellulose fibers which could achieve 1-10 μm in diameter and millimeters in length.. The tensile strength of PLAM_TSE5 increase 4.54% in 50.60 Mpa and modulus of elasticity increase 40.36% in 2.82 Gpa. Storage modulus of PLAM_TSE5 also increases 10.64% in 3.088 Mpa compare to pure PLA.

Mechanical properties and environmental assessment of recycled carbon fibre reinforced polypropylene and acrylonitrile butadiene styrene products

In this study, the main objective is to determine effect of recycled carbon fibre (RCF) on the mechanical properties of thermoplastics composites and associated environmental impacts. Such study is important to improve the strength of the composites as previous studies are limited on RCF composites, particularly in environmental aspects. In the compounding stage, extrusion process was carried out by using two different thermoplastics i.e. polypropylene (PP) and acrylonitrile butadience styrene (ABS) mixing with RCF. Particle size and weight loading of RCF were chosen as parameters to be studied. Bonding strength between the RCF and thermoplastics matrix was investigated through tensile and flexural properties. Lastly, the assessment of the products was carried out to determine the environmental impacts. Generally, the incorporation of RCF into PP and ABS plastic increases the tensile and flexural properties of the samples. It can be seen that the addition of rCF significantly improves tensile modulus and flexural strength up to 10 wt% filler loading. From the environmental impact assessment, the ABS products have greater impact in all categories. The usage of rCF reduce the amount of plastic hence leads to lower environmental impacts. The product has a potential to be used in mechanical demanding application particularly those require high flexural strength and tensile modulus properties.

Transparent polyamide-imide films with high Tg and low coefficient of thermal expansion: Design and synthesis

Two series of optically transparent polyamide-imides (PAIs) were prepared by copolymerization of trimelletic acid chloride (TMAc), p-phthaloyl chloride (TPC), 2,2′-bis(trifluoromethyl)-[1,1′-biphenyl]-4,4′-diamine (TFDB) and 4,4’-(9-fluorenylidene) diamine (FDA). These series of PAIs displayed high glass transition temperatures (Tgs) ranging from 340 to 441 °C, 5% weight loss temperatures (T5%s) in nitrogen with 459–505 °C, and low coefficient of thermal expansion (CTE) of 21–56 ppm/K, which greatly affected by the feed ratio of rigid TPC units and cardo diamine in the polymer main chain. The transmittances at 500 nm (T500nm) of the PAI films were found in the range of 70.0–87.7%, All polymers demonstrated good organosolubility and mechanical properties with tensile strengths of 77–146 MPa, tensile moduli of 2.9–5.8 GPa and elongations at break of 2.9–8.2%. PAI-7-8 presented the best combination of high Tg of 401 °C and high tensile modulus of 5.0 GPa, low CTE value of 24 ppm/K, and high transparency (T500nm) of 87.2%.

Experimentation and validation of basalt & jute fiber reinforced in polymer matrix hybrid composites

Hybrid composite is a combination of natural fiber and synthetic fibers. Nowadays, polymer hybrid composites are extensively used in several engineering applications. Basalt fiber, because of its high tensile strength and modulus is considered with jute, as jute possess incredible antistatic properties forms a hybrid with polyester resin. In this proposed work polyester resin is used as a matrix, basalt and jute fibers are used as reinforcement to develop hybrid composites by Compression Molding Technique. The primary mechanical properties such as tensile strength, tensile modulus and compressive strength were experimentally found using universal testing machine in warp and weft direction where parameters are force, displacement, thickness, volume fraction of resin to fill the reinforcement. The relative significance are discussed by subjecting the developed hybrid polymer composite to dynamic behavior, the various parameters like mode shape, damping factor, frequency, acceleration and force are analyzed using Fast Fourier Transform analyzer experimentally and validated by using Lab-view software.

Adhesive properties of poly (methyl silsesquioxanes)/bio-based epoxy nanocomposites

Poly(methyl silsesquioxanes), PMSQ, are cyclic siloxanes with unusual features that are also widely known as silsesquioxanes due to their organic peripheral and inorganic silicate interior. These are organosilicon compounds with the chemical formula [RSiO3/2]n that are called silsesquioxanes where R may be alkyl, alkoxyl or aryl. These hybrid materials are quite famous to exhibit garner properties from their different inorganic and organic parts in a synergistic way. However, dealing with long-standing challenges and environmentally friendly requirements, we synthesized these PMSQ fine nanoparticles in our own laboratory. These nanoparticles were uniformly dispersed in a bio-based epoxy resin, and the mechanical properties, adhesive strength, and morphology of resultant nanocomposites were evaluated. PMSQ were found to be successfully dispersed into the bio-based epoxy resin in varying weight fractions of 1 wt%, 3 wt% and 5 wt%. The mechanical properties of PMSO-loaded epoxy resin samples are reported as functions of processing parameters. The highly dispersed PMSQ/bio-based epoxy resin nanocomposites showed high tensile modulus and strength values. In addition, it was found that fracture toughness values of all samples prepared by ultra-sonication were increased by increasing PMSQ content in nanocomposites. The corresponding synthesized epoxy resin composites were characterized by different techniques including, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC). SEM analysis reported high uniformly dispersed spherical PMSQ particles in epoxy resin. The bonding properties including, tensile modulus and strength of PMSQ were determined using a general testing machine. The obtained results confirmed a significant improvement in bonding performance of PMSQ dispersed in bio-based epoxy resin. PMSQ attracts feasible widespread applications in mechanical and environmental engineering.

Hybrid epoxy composites made from treated curauá fibres and organophilic clay

This work evaluates an epoxy composite reinforced with curauá fibres and/or organophilic clay. Epoxy polymers reinforced with nano-clays are also assessed. Composites are manufactured by cold pressing using fibres in pristine and treated conditions. Three levels of the factors NaOH solution (2.5, 5 and 10%) and immersion time (2, 4 and 10 hours) are investigated. Nano-clays are incorporated at the levels of 2.5, 5 and 10 wt.%. The morphology and crystallinity of the treated fibres are evaluated by scanning electron microscopy and X-ray diffraction, respectively. Tensile, three-point bending and impact tests are performed to characterise the composites. Tensile strength, flexural strength and impact resistance are increased by 24%, 44% and 47%, respectively, when compared to untreated fibre composites. The highest tensile and flexural strengths are achieved by hybrid composites containing 5 wt.% of nano-clay and 20 wt.% of curauá fibres treated with 5% NaOH for 4 hours. In contrast, the highest tensile modulus is achieved when hybrid composites are made from untreated fibres and 10 wt.% of nanoparticles. The highest impact resistance is obtained by curauá composites, without particles, composed of fibres treated with 5% NaOH for 4 hours. The inclusion of nano-clay leads to reduced impact resistance values.

Flexible and ion-conductive ionogel towards energy storage application

Ionogel with flexibility and ionic conductivity is a promising component of electrochemical devices. Developing flexible ionogel with high conductivity is urgent for efficient energy storage. Here, a flexible ionogel has been developed from ionic liquid and polymer substrate through simple solution casting method. The as-prepared ionogel displays good mechanical properties with high tensile modulus of 1.6 MPa and break elongation of 9.1%. And the translucent ionogel shows flexibility, which can be bended arbitrarily and tangled onto rod. In addition, the ionogel based supercapacitor gives specific capacity of 62 F g−1 at current density of 1 A g−1 with high coulombic efficiency. The supercapacitor can deliver stable energy output in wide current densities from 1 to 10 A g−1, indicating good rate capability. The device presents long cycling life with capacity retention of 86.3% over 10,000 cycles, showing great potential for practical applications. This work sheds light on the design and synthesis of ionogels for electrochemical energy storage and conversion devices.

Tailoring Polylactic Acid Properties for Packaging Applications: Effects of Co‐Addition of Halloysite Nanotubes and Selected Plasticizers

Polylactic acid (PLA) has recently given a huge attention because of its mechanical properties and good physical like good biodegradability and processability, high tensile modulus and strength. In the current research, the researchers utilized sesame oil (SO) and low molecular weight polyethylene glycol (PEG) as hydrophobic and hydrophilic plasticizers, towards improvise the ductility and toughness of PLA. The researchers synthesized nanocomposites by solution casting of the neat PLA/HNTs and PLA blends with weight ratio of (0,10, 20 and 30 wt%) for PEG and (0, 5 and 10 wt%) for SO. The influence of both plasticizers on chemical, thermal and mechanical properties of the nanocomposites were investigated. Characterization of the systems was achieved by mechanical testing and thermogravimetric analysis (TGA), field emission scanning electron microscope (FESEM), Fourier transform infrared spectroscopy (FTIR). The FTIR analyses confirmed the existing of hydrogen bonding between PLA and both PEG and SO. significant improvement was shown by the plasticized nanocomposites in elongation at break with the adding of PEG and SO, meanwhile, the plasticized films’ strength were decreased. For the thermal analyses, all the films exhibited lower thermal stability compared to PLA/HNTs film.

Modification of poly(ethylene 2,5-furandicarboxylate) with aliphatic polycarbonate diols: 1. Randomnized copolymers with significantly improved ductility and high CO2 barrier performance

Poly(ethylene 2,5-furandicarboxylate) (PEF) is a very promising biobased polymer possessing very high mechanical strength, rigidity and gas barrier performance. But its poor ductility and toughness may limit its applications. In this study, PEF-based copolymers with high intrinsic viscosity were successfully synthesized via melt polycondensation of dimethyl 2,5-furandicarboxylate (DMFD) and ethylene glycol in the presence of a copolycarbonate diol (PPeHC diol) as produced from 1,5-pentylene diol (PeDO), 1,6-hexylene diol (HDO) and dimethyl carbonate, and characterized with 1H NMR, 13C NMR, DSC, TGA, tensile, impact and gas barrier testing. The products were “randomnized” as a result of ester-carbonate exchange reaction occurring along melt polycondensation, and therefore became amorphous copolymers possessing composition-dependent physico-mechanical properties which can be tunable from rigid-to-ductile thermoplastics to thermoplastic elastomers. Particularily, the copolymers with φPPeHC of 25 wt% and 30 wt% are thermoplastics possessing greatly improved ductility (elongation at break up to 194%) and CO2 barrier performance higher than poly(ethylene terephthalate) (PET; BIFCO2 3.6–2.8), and retaining high tensile modulus (2.2–1.9 GPa) and yielding strength (69–58 MPa) comparable to the bottle-grade PET. In comparison, the copolymer with φPPeHC of 40 wt% behaves as a high performance thermoplastic elastomer with excellent gas barrier performance as well as high tensile strength (23 MPa).

Preparation of tough, high modulus, and creep-resistant PS/SIS/halloysite blend nanocomposites

In this work, polystyrene (PS)/poly(styrene-b-isoprene-b-styrene) (SIS)/organophilic halloysite nanotube (Org-HNT) blend nanocomposites were produced by melt compounding technique. The significant improvements in both toughness and impact strength values were obtained in PS/SIS blends containing 20%, 30%, and 40% SIS elastomer as compared to neat PS. Among them, PS-30SIS blend with a co-continuous morphology exhibited moderate tensile and impact properties and its nanocomposites having 3, 5, 7 and 10 phr Org-HNT were prepared through the melt mixing method. All the nanocomposites exhibited continuous/fibrillar morphologies with smaller elastomer domains and higher tensile modulus and toughness as compared to PS-30SIS blend. Among them, the nanocomposite having 7 phr Org-HNT and 30% SIS phase (7H-30SIS) exhibited the highest impact strength with enhanced tensile properties. The same nanocomposite exhibited about 21% and 100% increments in the modulus and toughness in comparison to its blend, respectively. The 7H-30SIS nanocomposite increased storage moduli of PS-30SIS blend at glass transition regions of both polyisoprene and PS phases and also at room temperature. Moreover, the rubbery storage moduli of the nanocomposites were found to be about 37% and 53% higher for 7 and 10 phr Org-HNT loaded nanocomposites, respectively, in comparison with that of PS-30SIS blend. The creep deformation and permanent deformation of the blend both decreased via introduction of the nanotubes which is in agreement with aforementioned improvements in the stiffness.

Fabrication by Electrospinning Technique and Characterization of Curcuma Mangga Val Reinforced PVA Fibrous Membranes

Antimicrobial and anti-diabetic of Curcuma mangga Val properties have attracted research interest. Curcuma mangga Val extract (CME) and poly (vinyl alcohol) (PVA) were blended and fabricated to the fibrous membranes by the electrospinning method. The effects of CME concentration on the fiber morphology and tensile properties of CME/PVA membranes are the goal of the current study. Scanning electron microscopy (SEM) of the membranes revealed bead-free fibers with straightly/continuously orientation formed in all CME/PVA membranes. The average fiber diameter increased from 186 nm to 297 nm, with the CME concentration from 0 to 3 wt.%, respectively. The addition of 1% CME resulted in a relatively high tensile strength of 24.96 ± 0.20 MPa, which is the highest among the CME/PVA membrane specimens. However, very high tensile modulus and low elongation showed in these results lead to reducing the functionality of the CME/PVA fibrous membrane due to the brittleness. The CME properties may contribute to those shortages.

Adhesive properties of bio-based epoxy resin reinforced by cellulose nanocrystal additives

Abstract The adhesive properties of a self-prepared bio-based epoxy resin with native cellulose nanocrystals (CNCs) are evaluated in this article. The porosity of actual CNCs is high. The most promising finding is the acquisition of high tensile modulus. The addition of CNC composites significantly increased the tensile modulus at lower wt.%, and the maximum crystallinity of CNCs was obtained. Bearing in mind the advantages of CNCs, scanning electron microscopy (SEM) showed a uniform distribution of concentrated CNCs. Clusters were formed at higher CNCs ratios, and the composite matrix content with high CNCs produced good expansion, low crystallinity, and increased elongation. Our analysis showed that the original CNCs were more evenly distributed in the self-prepared bio-based epoxy resin, which enhanced transformation, supported by improved dispersion of native CNCs. The presence of native CNCs greatly improved and enhanced the bonding performance of the bio-based epoxy resin in the interface area. Enhancing the mechanical properties of native CNCs has broad application prospects in environmental areas. This suggests that the widespread use of native CNCs in environmental engineering applications is feasible, especially in terms of adhesives properties.

A novel structural‐mechanical hypotheses relating costameres and ECM to optimal functional properties of skeletal muscle

The objective of this work is to understand how passive structural components in skeletal muscle provide effective load transmission as the dimensions of the muscle change.In addition to forces transmitted along muscle fibers, there is a growing recognition that other structural components may transmit contractile loads laterally from myofibrils to the muscle sarcolemma and even between muscle fibers. This loading path is presumed to be mediated by several structural molecules which link myofibrils to the sarcolemma and endomysium and even link across the extracellular space to other muscle fibers. A challenging question is how such forces can be transmitted along the muscle by passive structures such as the endomysium as the dimensions of the muscle change. Corresponding changes in the dimensions of passive materials will influence their ability to transmit mechanical loading due to their force/length properties. One dimension which may not experience significant changes as a muscle changes length is an oblique fiber cross section aligned with the aponeurosis of the muscle (y axis of figure & Huijing, 1998, J. Electromyogr. Kinesiol. 8:61–77). We simulated muscle contractions with a stiff tensile material oriented along this axis and found an increased force output relative to other muscle models. The unchanging dimension of this material means that the force it may transmit is not affected by changes of muscle length.Additionally, the constant area of the x‐y muscle plane illustrated in the lower part of the figure at all muscle lengths requires that the z dimension perpendicular to that plane must remain constant to maintain constant muscle volume. We concluded that a further critical component of passive muscle structure is a high tensile modulus along the z‐axis. These requirements for high tensile modulus along both the z and y axes suggest the presence of high tensile modulus over the y‐z plane, further suggesting that intra‐ and extracellular structural molecules, known to be anisotropic, must be specifically oriented to optimize muscle function. Costameres seem highly suited for this function. It is significant to note that our hypothesis suggests that critical mechanical properties (structural molecules?) may not be aligned with the long and/or cross‐sectional axes of the muscle fibers as commonly depicted. Furthermore, at least in the longitudinal (y axis) direction, the structural materials must retain similar properties within and across the intra‐ and extracellular regions of the muscle in order to maintain continuity of tensile mudulus.The figure illustrates a bundle of muscle fibers in the x‐y plane between two constant dimension y‐z planes. The dimension along the z axis remains constant during shortening, constrained by the tensile structure, maximizing the dimensional change along the other cross sectional axis. The longitudinal (y) axis of the plane provides a minimally deformed material to efficiently transmit both lateral and longitudinal force vectors at all muscle lengths without the mechanical consequences of deforming passive materials.Support or Funding InformationSupported by NIA Grant R01AG056999Diagram of hypothesized costamere planes traversing muscle fibersFigure 1

Influence of cellulose nanocrystal/sisal fiber on the mechanical, thermal, and morphological performance of polypropylene hybrid composites

Polypropylene (PP)/sisal fiber (SiF)/cellulose nanocrystals (CNC) hybrid composites were prepared at a variable weight percentage of SiF/CNC loading (29:1, 27:3, 25:5, and 23:7) using melt-blending technique followed by injection molding. The dispersion of the CNCs and SiFs within the nonpolar PP matrix was enhanced by using maleic anhydride grafted PP (MAPP) as a compatibilizer. Furthermore, the mechanical properties like tensile, flexural, and impact properties of the hybrid composites were evaluated. High tensile strength and modulus of 47.02 MPa and 2820.26 MPa, respectively, were observed for the hybrid composite with the incorporation of SiF/CNC (27:3 wt%) in the presence of 5 wt% MAPP. Additionally, an increment of 30.87% and 14.81% was observed for corresponding flexural strength and modulus as compared to their counterparts without MAPP. The elastic moduli obtained experimentally were compared with the theoretical elastic moduli using Cox–Krenchel and Ouali model in combination with the Halpin–Tsai model. Surface morphology by field emission scanning electron microscopy observed that the CNCs and SiFs were well dispersed within the PP matrix in the presence of MAPP. Differential scanning calorimetry thermograms showed no measurable changes in the melting temperature (Tm) of PP in PP hybrid composites; however, an increment in the crystallization temperature (Tc) was observed. The thermogravimetric analysis confirmed the enhancement in the thermal stability of PP hybrid composites due to the synergistic effect of hybridization within the PP matrix. Partial substitution of CNCs along with SiFs within the matrix polymer shows an increment in the stiffness of the hybrid composites as evident by dynamic mechanical analysis.

Improving Mechanical Properties and Biocompatibilities by Highly Oriented Long Chain Branching Poly(lactic acid) with Bionic Surface Structures.

Exploiting the solid-state drawing (SSD) process toward polymer materials for medical implant devices is of significance to simultaneously improve the mechanical property and biocompatibility. Herein, for the first time, the bionic implants with a microvalley surface of oriented long chain branching PLA (b-PLA) was fabricated by a feasible SSD process. The as-obtained b-PLAs could not only show a high tensile strength (278.1 MPa) and modulus (4.32 GPa) but also bear a superior protein adsorption as high as 622 ng/cm2. Such exceptional mechanical properties and biocompatibility could be ascribed to the SSD process-induced highly orientation degree and the morphology of parallel grooves within ridges structures, resulting in the greatly enhanced crystallinity and surface hydrophobicity as well as a biocompatible vascular endothelial microstructure for cell to adhesion and growth and thus an improved proliferation, differentiation, and activity of osteoblasts with spindle-shaped and spread morphology on surface of the b-PLAs. These findings may pave the way for designing the novel biomaterials for vascular stent or tissue engineering devices by the SSD process.

Vertical Fibrous Morphology and Structure-Function Relationship in Natural and Biomimetic Suction-Based Adhesion Discs

Summary Recent years have seen rapid development in bio-inspired materials for adhesion. However, it remains challenging to realize robust adhesion on rough aquatic surfaces. An inspiring natural model is the remora fish, which has evolved to retain powerful adhesion to hosts using a dorsal suction disc. We find that the remora suction disc has a unique fibrous architecture of vertically oriented collagen fibers that enable anisotropic mechanical properties and enhanced adhesion performance. In the engineered prototype, vertically oriented nylon fibers are embedded into the soft silicone matrix using electrostatic flocking. The anisotropic mechanical properties are validated in both natural and biomimetic suction discs. Furthermore, the biomimetic suction disc demonstrates an enhanced adhesion function with a maximum 62.5% increase in pull-off force and a 340% increase in attachment time compared with the silicone control. This work can shed light on natural adhesion mechanisms and inspire novel designs for aquatic soft adhesives and actuators.

Vapour-assisted roll-to-roll nanoimprinting of micropillars on nanocellulose films

Here we demonstrate a straightforward vapour-assisted roll-to-roll nanoimprinting lithography (R2RVANIL) patterning method to biobased nanocellulosic films with the aim to fabricate microstructured films with diffraction effect. In the R2RVANIL technique a roll with pillar structures is softly pressed against nanocellulose film in the presence of hot water vapour replicating the pattern onto the film. The printed pillar structures are compared with the structures produced using traditional thermal R2RNIL. The manufacturing method is demonstrated using optically transparent TEMPO-oxidised cellulose nanofibrils (TEMPO CNF). TEMPO CNF films possess high tensile strength and modulus whereas the tensile strain is low, they are very hygroscopic - a property which improves material processing at elevated humidities, thus overcoming a lack of a clear softening point. In this context, the water molecules are acting as plasticising molecules thereby softening the relative brittle nanocellulose film structures. Patterned pillars were achieved due to the swelling and softening of the film which was contacted with moist air. R2RVANIL method appears to be more gentle and surface properties such as roughness are different from the ones achieved via conventional thermal NIL method. The diffraction grating is demonstrated using laser beam compared to calculated diffraction patterns. Water vapour assisted patterning methods are beneficial, for example, in the future optics and electronics where films cannot be processed under high pressure and, on the other hand, high production volumes are needed.

Effects of post-gamma irradiation on swelling and mechanical properties of gamma vulcanized natural rubber latex (GVNRL) films

Gamma vulcanized natural rubber latex (GVNRL) films have shown promising properties for various applications that require less hazardous chemicals used or released during manufacturing and/or utilization. Examples of potential applications include the uses as chemical-free latex gloves in medical or food-related facilities and as stretchable latex covers for food and agricultural products. However, due to possible degradation on swelling and mechanical properties of these films from post-gamma irradiation used for sterilization, thorough investigations are required in order to fully understand their possible changes and/or degradations in properties of interest. As a result, this work investigated on effects of post-gamma irradiation on swelling and mechanical properties of natural rubber latex (NRL) films, which were pre-vulcanized using 12-kGy and 24-kGy gamma irradiation. The properties of interest in this work included tensile modulus at 300% elongation, tensile strength, and elongation at break, as well as other related physical properties such as swelling ratios and crosslink densities. The results showed that, for samples before post-gamma irradiation, the GVNRL films with 24-kGy vulcanizing dose had higher tensile modulus, tensile strength, and crosslink density, but lower elongation at break and swelling ratio, than the films with 12-kGy vulcanizing dose. However, after post-gamma irradiation at the accumulated dose of 24 kGy, the films with 12-kGy vulcanizing dose showed significant improvements in the values of tensile modulus, tensile strength, and crosslink density, whereas the films with 24-kGy vulcanizing dose showed noticeably degradation in these properties. Hence, the overall results suggested that, while higher gamma vulcanizing doses could initially produce NRL films with higher mechanical strength, they were more negatively affected by post-gamma irradiation such that mechanical degradation could be observed.