聚乳酸(PLA)木塑复合材料由于其可生物降解性,与传统的石油基塑料相比具有显着优势。然而,解放军有几个缺点,包括高脆性,低耐热性,缓慢结晶,与生物质材料的相容性差,这限制了其潜在的应用。在本文中,我们研究了羧基封端的超支化聚酯(CHBP)对机械,结晶,聚乳酸/秸秆粉(SF)共混物通过挤出注塑成型的热性能。此外,我们加入传统增塑剂聚乙二醇(PEG)与CHBP协同增强PLA/SF复合材料的韧性。我们的结果表明,适当添加CHBP可以有效地改善PLA与秸秆粉之间的界面结合。CHBP的掺入也提高了拉伸强度,弯曲强度,冲击强度,断裂伸长率,热稳定性,和复合材料的结晶速率。此外,与单独使用PEG相比,CHBP和PEG的加入显著提高了复合材料的冲击强度。该方法还提高了材料的耐热性,减少了增塑剂的迁移。我们的研究证明了使用超支化聚合物和增塑剂来增强韧性的可行性,热稳定性,聚乳酸木塑复合材料的结晶性能,为提高这些复合材料的性能提供了新的途径。
Polylactic acid (PLA) wood-plastic composites have a significant advantage over traditional petroleum-based plastics due to their biodegradability. However, PLA has several shortcomings, including high brittleness, low heat resistance, slow crystallization, and poor compatibility with biomass materials, which have limited its potential applications. In this paper, we investigated the effects of carboxy-terminated hyperbranched polyester (CHBP) on the mechanical, crystalline, and thermal properties of PLA/straw flour (SF) blends through extrusion injection molding. Additionally, we added the traditional plasticizer polyethylene glycol (PEG) to synergize with CHBP to enhance the toughness of PLA/SF composites. Our results showed that the appropriate addition of CHBP effectively improved the interfacial bonding between PLA and straw flour. The incorporation of CHBP also improved the tensile strength, bending strength, impact strength, elongation at break, thermal stability, and crystallization rate of the composites. Furthermore, the addition of both CHBP and PEG significantly improved the impact strength of the composites compared to using PEG alone. This method also improved the heat resistance of the material and reduced the migration of plasticizers. Our study demonstrates the feasibility of using hyperbranched polymers and plasticizers to enhance the toughness, thermal stability, and crystalline properties of PLA wood-plastic composites, providing a new approach to improving the properties of these composites.