Comparison of Properties of Poly(Lactic Acid) Composites Prepared from Different Components of Corn Straw Fiber

Abstract

In recent years, under the pressure of resource shortage and white pollution, the development and utilization of biodegradable wood-plastic composites (WPC) has become one of the hot spots for scholars’ research. Here, corn straw fiber (CSF) was chosen to reinforce a poly(lactic acid) (PLA) matrix with a mass ratio of 3:7, and the CSF/PLA composites were obtained by melt mixing. The results showed that the mechanical properties of the corn straw fiber core (CSFC) and corn straw fiber skin (CSFS) loaded PLA composites were stronger than those of the CSFS/PLA composites when the particle size of CSF was low. The tensile strength and bending strength of CSFS/CSFC/PLA are 54.08 MPa and 87.24 MPa, respectively, and the elongation at break is 4.60%. After soaking for 8 hours, the water absorption of CSF/PLA composite reached saturation. When the particle size of CSF is above 80 mesh, the saturated water absorption of the material is kept below 7%, and CSF/PLA composite has good hydrophobicity, which is mainly related to the interfacial compatibility between PLA and CSF. By observing the microstructure of the cross section of the CSF/PLA composite, the research found that the smaller the particle size of CSF, the smoother the cross section of the composite and the more unified the dispersion of CSF in PLA. Therefore, exploring the composites formed by different components of CSF and PLA can not only expand the application range of PLA, but also enhance the application value of CSF in the field of composites.

Biologial Activity of Plant Metabolites

“…Some common types of matrix materials used in corn stover composites are thermoplastic polyolefins from the recycling industry, such as polyethylene (Chun K. S. Et al., 2017), or polypropylene (Delgado-Aguilar M. et al, 2018) on one hand, or, on the other hand, polyvinyl alcohol very well known for its biodegradability (Yong K. J., 2022). A biodegradable and bio-based polymers such as polylactide acid (Qi Z., 2022), polycaprolactone (Wu C. S. and Liao, H. T. 2012), polyurethane (Kocak E. D. et al, 2023), natural resins such as soy-based resins (Pfister D. P. and Larock R. C. 2010), starchbased (Ibrahim M. I. J. et al 2019) or lignin-based matrix (Yuan Y. et al, 2019) that enhances the eco-friendliness and sustainability of corn stover composites, can be used. Combining different polymers to create a hybrid matrix that optimizes properties such as strength, flexibility, and biodegradability, polymer blends are also a possible choice (Li R. et al 2023).…”

Sifat Fisik Dan Mekanik Kemasan Tableware Dari Komposit Ampas Teh Hitam Dan Tepung Tapioka

“…Penyerapan air bermula dari adsorpsi air yang diberikan di permukaan luar komposit, ketika sel dari komposit menjadi jenuh maka air dapat masuk ke dalam struktur internal lewat celah antara matriks dan pengisi. Partikel serat berukuran besar cenderung membentuk rongga dan celah dalam komposit sehingga memungkinkan molekul air untuk masuk lebih banyak ke dalam komposit sehingga penyerapan air menjadi lebih tinggi (Qi et al, 2022).…”

Toward the production of biopolyethylene‐based ecocomposites with improved performance: The potential of eggshell particles as an ecological additive

“…[6][7][8] Developing ecocomposites and better adapting plastics production processes are necessary to reduce environmental damage. 9,10 Recently, [11][12][13][14] much attention has been focused on producing ecocomposites reinforced with natural raw materials due to biodegradability, low density, wide availability, low cost, carbon capture, and usually low energy content. The main renewable polymer matrices used for ecological composites production are polycaprolactone, 15,16 poly(lactic acid), 17,18 polyhydroxybutyrate, 19,20 poly(butylene adipate co-terephthalate), 21,22 and biopolyethylene (BioPE), 23,24 considering good mechanical properties for structural applications.…”