在生物基聚酸/聚4-基酸混合物中,不同兼容剂的拉伸性能和变形
Haoqi Luo1, Xiangyan Yang1, Qingyi Ding1
1Department of Polymer Materials and Engineering, School of Physics and Materials, Nanchang University, 330031 Nanchang, PR China.
International journal of biological macromolecules
|October 19, 2024
概括
将MSG或POM等兼容剂添加到聚4-乙酸 (P4HB) 和聚酸 (PLLA) 混合物中,可以显著提高它们的灵活性和强度. 这些添加剂增强了混合物的兼容性,从而带来了优越的拉伸性能和材料性能.
科学领域:
- 聚合物科学 聚合物科学
- 材料科学 材料科学 材料科学
- 生物材料是一种生物材料.
背景情况:
- 聚酸 (PLLA) 具有脆性,限制了其应用.
- 将PLLA与聚4-基酸盐 (P4HB) 混合,可以提供完全基于生物的替代品,但兼容性不佳.
- 了解兼容剂对PLLA/P4HB混合物形态和变形的影响至关重要.
研究的目的:
- 调查反应性 (MSG) 和非反应性 (POM) 兼容剂对PLLA/P4HB混合物特性的影响.
- 阐明兼容剂影响混合物形态,结晶和拉伸变形的机制.
- 为基于PLLA的混合物选择兼容剂制定准则.
主要方法:
- 准备的PLLA/P4HB混合物中含有不同度的MSG和POM兼容剂.
- 拉力测试用于评估机械性能,特别是断裂时的延伸.
- 微角X射线散射 (SAXS) 和广角X射线散射 (WAXS) 用于分析混合物形态和晶体结构.
主要成果:
- 两种MSG和POM兼容剂都显著增强了PLLA/P4HB混合物的破裂延伸,在最佳度下超过300%.
- MSG抑制了PLLA结晶并延长了应力稳定性,而POM促进了结晶和长时间的应力硬化.
- 兼容剂改变了混合物变形机制,MSG延迟了化,POM促进了再结晶.
结论:
- MSG和POM是PLLA/P4HB混合物的有效兼容剂,克服了固有的不兼容性问题.
- 兼容剂的选择影响混合物形态和变形行为,提供可调节的材料特性.
- 这些发现为选择兼容剂来定制基于PLLA的混合性能提供了理论基础.
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