研究流量诱导导向型iPB-1的快速相位过渡机制
Lincheng Ji1, Heng Zhang1, Youxin Ji1
1College of Materials Science and Engineering, National Engineering Research Center for Advanced Polymer Processing Technology, The Key Laboratory of Material Processing and Mold of Ministry of Education, Zhengzhou University, Zhengzhou, 450002, P. R. China. yxji@zzu.edu.cn.
Soft matter
|March 19, 2025
概括
在化温度以上的异性聚乙烯-1 (iPB-1) 的火减缓了其相位过渡. 长时间的回火显著降低了转换动力学,影响了工业制造工艺.
科学领域:
- 聚合物物理 聚合物物理
- 材料科学 材料科学 材料科学
- 结晶运动学 结晶运动学
背景情况:
- 对聚合物物理学和工业来说,同位性聚烯-1 (iPB-1) 的相位过渡至关重要.
- 流动诱导的定向形式II的过渡速度比静止的同位素形式II快.
研究的目的:
- 调查无形区域对iPB-1转换动力学的影响.
- 了解退火如何影响相位过渡速率和机制.
主要方法:
- 使用了现场的X射线衍射和定制的扩展性风力计.
- 在各种温度和持续时间下进行了回火研究.
- 分析了小角度X射线散射 (SAXS) 数据.
主要成果:
- 在化温度 (Tm) 以上的化下降了相位过渡速率.
- 长时间的回火显著降低了转化动力学.
- 在化过程中晶度保持不变,但在冷却时增加.
- 萨克斯表示,化后长间距减少,这表明链条松.
结论:
- 在化过程中无形区域的放松会对iPB-1相位过渡动力学产生负面影响.
- 建议在iPB-1制造中进行快速冷却,以保持无形链结构并增强相位过渡.
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