This work aims to improve the mechanical properties of starch-based hydrogels using a double-network (DN) strategy. The single network (SN) starch hydrogel was first prepared glutaraldehyde as crosslinker. compressive SN were influenced by both crosslinker content and crosslinking time. possessing best then fabricated into DN hydrogels. Poly(vinyl alcohol) (PVA) borax used secondary polymer crosslinker, respectively. PVA-borax complexation partly enhanced hydrogel's modulus 30% its toughness...

In this study, properties of natural rubber (NR) were enhanced by adding sisal fiber, which is a tropical plant in Thailand. Sisal fiber/natural composites prepared the incorporation fiber at various loadings into rubber. Natural grafted with maleic anhydride (NR-g-MA) house and epoxidized (ENR50) used to enhance compatibility between With increasing loading, tear strength hardness increased while their scorch time, cure tensile strength, elongation break decreased. Moreover, interfacial...

Bisphenol-A based epoxy resin was modified by blending with 1% weight (wt%) of methyl methacrylate (MMA)/glycidyl (GMA) grafted depolymerized natural rubber (GDNR). The blend showed the impact strength 163% higher than that neat resin. In order to study effect alkalized and silanized woven sisal fiber on properties 1 wt% GDNR/epoxy blend, prepared using 2 NaOH solution treated γ-glycidoxypropyltrimethoxysilane (A-187). Composites were manufactured hand-lay up process. Amounts in composite 3,...

Generally, poly(ethylene glycol) (PEG) is added to poly(lactic acid) (PLA) reduce brittleness and improve mechanical properties. However, shape memory properties of PEG/PLA blends suffered due the blend's incompatibility. To enhance abilities blends, 0.45% maleic anhydride-grafted (PLA-g-MA) was used as a compatibilizer. Thermal properties, morphologies, microstructures, containing different PLA-g-MA contents were investigated. The compatibilized blend with 2 wt% exhibited enhanced tensile...

Poly(lactic acid) (PLA) exhibits excellent shape memory properties but suffers from brittleness and a high glass transition temperature (Tg), limiting its utility in flexible durable applications. This study explored the modification of PLA through incorporation poly(ethylene glycol) (PEG), varying both content (5–20 wt%) molecular weight (4000–12,000 g/mol), to enhance suitability for specific applications, such as medical splints. The PLA/PEG blend, containing 15 wt% PEG with 12,000 g/mol,...

Calcined eggshell powder, prepared from waste eggshell, was melted mixed with HDPE at contents of 10–40 wt%. It shown that calcined powder a good functional filler for HDPE. Young's modulus and ultimate stress the filled increased increasing content. In addition, thermal decomposition temperature yield strength were not significantly influenced by addition filler. Compatibilizing 2 wt% maleic anhydride grafted improved impact according to homogeneous distribution

This study illustrated the potential applications of thermoresponsive poly(N-isopropylacrylamide) (PNIPAm) grafted nylon membranes with different grafting yields and architecture. The gating performance at temperatures below above lower critical solution temperature (LCST) PNIPAm (32 °C) were demonstrated. linear PNIPAm-grafted membrane exhibited a sharp response over range 20–40 °C. yield 25.5% 21.9%, for crosslinked respectively, highest function water flux had stable repeatable...

Abstract Highly filled wood‐substituted composites from matrices based on polymer alloys of benzoxazine resin (BA‐a) and phenolic novolac using Hevea brasiliensis woodflour as a filler were developed. The results reveal that can significantly reduce the curing temperature neat resin, thereby minimizing degradation during processing. limiting oxygen indices (LOIs) all BP above self‐extinguishable limit i.e. >26. In addition, LOI values found to moderately increase whereas rate burning...

This study was a preliminary observation for potential use of the bovine bone-based hydroxyapatite (b-HA)/poly(lactic acid) (PLA) composite as biomaterial. SEM micrographs, XRD pattern, and FTIR spectrum calcined bone revealed that obtained powder in form crystalline carbonated HA, highly agglomerated. The surface HA modified with either 3-aminopropyltriethoxysilane (APES) or 3-methacryloxypropyltrimethoxysilane (MPTS) order to enhance compatibility between b-HA PLA matrix. TGA GPC results...

Three types of arylamine‐based benzoxazine resins modified with both condensed‐phase and gas‐phase action flame retardant, i.e. triphenyl phosphate (TPP) at various weight ratios were investigated. From rheological study, it was found that the viscosity benzoxazines/TPP mixtures significantly lower than neat monomers suggesting flow property enhancement. Furthermore, differential scanning calorimetry results revealed onset maximum temperatures exothermic peak, due to ring opening...

In this study, the effect of silane treatment methods on cure characteristics and mechanical, dynamic morphological properties rice husk flour (RHF)/natural rubber (NR) composites was investigated. The RHF surface pretreated with alkali solution then treated bis(triethoxysilylpropyl) tetrasulfide (TESPT) using unwashing method washing method. expected difference between these two layers presented surface. Unwashed TESPT‐treated (UW‐ST) washed (W‐ST) were incorporated into NR to prepare...

Thermo-responsive, biocompatible polyurethane (PU) with shape memory properties is highly desirable for biomedical applications. An innovative approach to producing wound closure strips using polymers (SMPs) of significant interest. In this work, PU composed polycaprolactone (PCL) and 1,4-butanediol (BDO) was synthesized two-step polymerization. Palm oil (PO) added enhancing the Young’s modulus beyond set criterion 130 MPa. It found that had ability crystallize at room temperature segments...

Abstract The effect of natural fibers (vetiver grass and rossells) on quiescent crystallization polypropylene (PP) composites was analyzed in this study. Also, equilibrium melting temperature ( T ) the elucidated. Natural fiber‐PP showed lower when compared to neat PP. Thermal analysis performed via differential scanning calorimeter study kinetics. exhibited higher rate than that Furthermore, spherulitic growth transcrystallinity were investigated under a polarized light optical microscope....

In this work, nano-size HA was produced from bovine bone. At various heat treatment temperatures, poorly crystalline, partially crystalline and forms of were obtained. PLA composites prepared by incorporating contents into matrix. The characteristics the obtained powders affected properties including mechanical properties, morphologies, molecular weight, in vitro bioactivity degradation behaviors composites. case study, all illustrated induction bone-like calcium phosphate compounds on their...

Summary In this study, physical properties of glycidyl methacrylate grafted polylactic acid (PLA‐g‐GMA) were studied and compared with those (PLA). PLA‐g‐GMA was prepared by using an internal mixer. Differences in crystallization characteristics between PLA observed from X‐ray diffraction (XRD). After applying tensile stress to samples, peak (2θ) at about 29° clearly occurred only samples. This implies that small crystals may be formed during PLA‐g‐GMA. The stress‐strain curve exhibits...

In this study, flame-retardant poly (butylene succinate) (PBS) composites were developed utilizing a bio-based intumescent flame retardant (IFR) system. Water hyacinth fiber (WHF) was used as carbon source, while ammonium polyphosphate (APP) served both an acid source and blowing agent. Effects of WHF:APP weight ratio total IFR content on the thermal stability flammability WHF/APP/PBS investigated. The results demonstrated that 15WHF/30APP/PBS composite with WHF to APP 1:2 45 wt% had maximum...

ABSTRACT The cold‐crystallization and crystal evolution of amorphous poly(lactic acid) (PLA) are analyzed during multistep tensile deformation annealing at 70°C using in situ synchrotron wide‐angle X‐ray scattering (WAXS) measurements. 2D‐WAXS diffraction pattern reveals that the PLA crystalline structure forms perpendicular to draw direction. process lets a rearrangement structure, while stretching causes contraction. Both WAXS FTIR analyses confirm crystals developed through α′‐form....