通过高压压缩成型的生物质衍生合物聚胺 (PA11) 的分子定向和机械性能
Keisuke Ura1,2, Shotaro Nishitsuji2, Yutaka Kobayashi3
1Industrial Technology Institute, Miyagi Prefectural Government, Sendai 981-3206, Japan.
高压压缩成型通过诱导分子导向和稳定的三角形-prime (δ′) 晶相,显著提高了聚胺11 (PA11) 的机械性能. 这种方法可以提高拉伸强度,而不会损害冷却后的性能.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物科学 聚合物科学
- 生物材料工程 生物材料工程
背景情况:
- 聚胺11 (PA11) 是一种多功能,生物质衍生聚合物,具有先进应用的潜力.
- 优化PA11的机械性能对于扩大其在苛刻环境中的使用至关重要.
- 了解处理条件对PA11的结构-财产关系的影响是关键.
研究的目的:
- 研究高压压缩成型对PA11分子方向和机械性能的影响.
- 探索处理参数 (温度,压力) 与PA11的晶相行为之间的关系.
- 为了确定增强PA11抗拉强度的最佳条件.
主要方法:
- 在不同温度和压力下进行高压压缩成型.
- 拉力测试用于评估机械性能.
- 差分扫描热量计 (DSC) 和广角X射线散射 (WAXS) 用于热和结构分析.
- 极化光学显微镜 (POM) 用于观察分子方向.
主要成果:
- 在1000kN和140°C下,拉力断裂强度增加了2.4倍.
- 高压成型诱导了向 δ′晶体相的转移,在冷却后保留.
- 最佳条件 (1000 kN, 140 °C) 促进了分子导向和增加晶体性,增强强度.
- 较高的温度 (180°C) 导致方向性下降,尽管结晶性增加,但强度降低.
结论:
- 高压压缩成型有效增强PA11的机械性能.
- 分子导向和稳定的δ′相的形成对于提高拉伸强度至关重要.
- 处理温度和压力极大地影响PA11的相位转换,结晶性和分子方向,从而控制机械行为.
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