核激剂对聚[(R) -3-xybutyrate-co-R) -3-xyhexanoate结晶的作用
Masahiro Fujita1, Noboru Ohta2, Kiyoshi Yagi3
1Bioplastic Research Team, RIKEN CSRS, Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan.
五乙醇 (PERT) 作为核化剂,显著加快了聚-3-基酸-co-3-基酸 (P-3HB-co-3HH) 的结晶. 结合,而不是格子匹配,是这种增强核化过程的关键.
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
- 结晶研究 结晶研究
背景情况:
- 聚-[(R) -3-基酸盐-co-(R) -3-基酸盐] (P-(3HB-co-3HH)) 是一种具有潜在应用的可生物降解聚合物.
- 控制P-(3HB-co-3HH) 的结晶行为对于定制其材料特性至关重要.
- 核剂可以影响聚合物结晶动力学和形态学.
研究的目的:
- 为了研究作为核化剂的五乙醇 (PERT) 对P-(3HB-co-3HH) 结晶的作用.
- 阐明PERT诱导的异质核化的机制.
- 了解控制核形成的分子相互作用.
主要方法:
- 同时的同步射线辐射广角X射线衍射 (WAXD) 和小角X射线散射 (SAXS) 用于实时结晶监测.
- 同热结晶实验在各种温度下,有或没有PERT.
- 分子动力学 (MD) 模拟用于研究分子链-基质相互作用.
主要成果:
- 在显著更高的温度下,PERT诱导异质核化,其中纯P-(3HB-co-3HH) 结晶是最小的.
- 在PERT的存在下,结晶的诱导期大幅缩短.
- 模拟MD显示了有吸引力的相互作用和P-(3HB) 碳基基向PERT基基的特定方向.
- 晶体形状和P-(3HB) 的形态保持不变,表明核化增强而不改变晶体结构.
结论:
- 五乙醇 (PERT) 有效地作为P-(3HB-co-3HH的核化剂,通过增加核化位密度来增强结晶性.
- 在PERT上P-(3HB) 的异质核化的主要机制涉及键的形成,而不是晶格的匹配.
- 这项研究为潜在的材料应用提供了关于控制P-(3HB-co-3HH) 结晶的见解.
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