Hygrothermal aging and tensile behavior of injection‐molded rice husk‐filled polypropylene composites

Abstract

ABSTRACT:The effect of the filler volume fraction on the tensile behavior of injectionmolded rice husk-filled polypropylene (RH-PP) composites was studied. Hygrothermal aging behavior was also investigated by immersing the specimens in distilled water at 30 and 90°C. The kinetics of moisture absorption was studied from the amount of water uptake by specimens at regular interval times. It was found that the diffusion coefficient and the maximum moisture content are dependent on the filler volume fraction and the immersion temperatures. Incorporation of RH into the PP matrix has led to a significant improvement in the tensile modulus and a moderate improvement in the tensile strength. Elongation at break and energy at break, on the other hand, decreased drastically with the incorporation of the RH filler. The extent of deterioration incurred by hygrothermal aging was dependent on the immersion temperature. Both the tensile strength and tensile modulus deteriorated as a result of the combined effect of thermal aging and moisture attack. Furthermore, the tensile properties were not recovered upon redrying of the specimens. Scanning electron microscopy was used to investigate the mode of failure of the RH-PP composites.

Biocomposite consisting of miscanthus fiber and biodegradable binary blend matrix: compatibilization and performance evaluation

“…This could be associated with the agglomeration of bers in the matrix. 23 The exural strength of the uncompatibilized composites is still superior in comparison to PBS/PBAT blend matrix. This phenomenon once again proves that the miscanthus bers have good reinforcing capabilities in the polymer matrix.…”

“…Similar occurrence has been reported in exural modulus with increasing ller content in polymer matrices. 23,24 Moreover, the addition of miscanthus bers into polymer matrix resulted in superior exural properties than its matrix. 25 As mentioned before, the polymer chain mobility has been hindered in the presence of bers, consequently the composites become stiffer and have a higher exural strength as compared to their matrix.…”

Effect of fiber surface modification on the lifetime of glass fiber reinforced polymerized cyclic butylene terephthalate composites in hygrothermal conditions

“…Many publications have investigated the mechanical and thermal characterization of FRP under different hygrothermal conditions. The effects of moisture and applied temperature on mechanical properties of FRP are investigated in the literature [5][6][7][8][9][10][11][12][13][14]. In detail, Bajracharya et al [5] reviewed the mechanical properties and durability of glass fiber reinforced recycled mixed plastic waste composites.…”

“…They found that moisture absorption was a critical factor that controlled the thermal and mechanical properties of GFRP rebar. Mohd Ishak et al [9][10][11] have done many works on the hygrothermal aging properties of fiber reinforced polymer composites. Tajvidi et al [12] and Ellyin et al [13] have investigated the effect of temperature on different composites.…”

NaBF4 as a hygrothermal durability enhancer for glass fibre reinforced polypropylene composites

“…Besides these perfect covalent bondings, there are still some un-reacted silanol groups, polar groups of lubricants or surfactants [15] and other weak points in the interphase, which are liable to interact with [16] and accommodate water molecules, leading to the degradation of interphase properties, correspondingly, the mechanical properties of composites. When the non-hygroscopic features of GFs and PP are taken into consideration [17], it becomes obvious that proper interphase design holds great promise to improve the hygrothermal durability of composites [3]. However, as yet reports addressing the further improvement of the hygrothermal durability of GF (the most widely used fibre reinforcement globally) reinforced PP composites are rather limited.…”