Abstract
The compatibility between poly(lactic acid) (PLA) and natural fibers to develop bio-sourced, recyclable, and biodegradable composites remains a commonplace issue. This work highlights that, at least in the case of hemp, pulping and bleaching towards delignified short fibers attained remarkable improvements over untreated hemp strands. This approach differs from usual proposals of chemically modifying hydroxyl groups. Soda-bleached hemp fibers (SBHFs) granted a relatively large bonding surface area and a satisfactory quality of the interphase, even in the absence of any dispersant or compatibilizer. To attain satisfactory dispersion, the matrix and the fibers were subjected to kinetic mixing and to a moderately intensified extrusion process. Then, dog-bone specimens were prepared by injection molding. Up to a fiber content of 30 wt.%, the tensile strength increased linearly with the volume fraction of the dispersed phase. It reached a maximum value of 77.8 MPa, signifying a relative enhancement of about 52%. In comparison, the tensile strength for PLA/hemp strands was 55.7 MPa. Thence, based on the modified rule of mixtures and the Kelly & Tyson modified equation, we analyzed this performance at the level of the constituent materials. The interfacial shear strength (over 28 MPa) and other micromechanical parameters were computed. Overall, this biocomposite was found to outperform a polypropylene/sized glass fiber composite (without coupling agent) in terms of tensile strength, while fulfilling the principles of green chemistry.
Funder
Spanish Ministry of Science and Innovation
Subject
Polymers and Plastics,General Chemistry
Reference48 articles.
1. (2022, November 29). UN News UN Environment Assembly Opens, Sets Sites on Ending Plastic Pollution. Available online: https://news.un.org/en/story/2022/02/1112972.
2. (2022, December 22). EUR-Lex Communication from the Commission to the European Parliament, the Council, the European Economic and Social Committee and the Committee of the Regions. Roadmap to a Resource Efficient Europe. Available online: https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:52011DC0571.
3. Influence of Recycling of Poly(lactic acid) on Packaging Relevant Properties;Hopmann;J. Appl. Polym. Sci.,2015
4. Plant Fibre-Reinforced Polymers: Where Do We Stand in Terms of Tensile Properties?;Bumbaris;Int. Mater. Rev.,2017
5. Recent Progresses of Fabrication and Characterization of Fibers-Reinforced Composites: A Review;Yang;Compos. Commun.,2019
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献