Concepts of Nucleation in Polymer Crystallization

Concepts of Nucleation in Polymer Crystallization
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聚合物结晶成核的概念

DOI:
10.3390/cryst11030304
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发表时间:
2021-03
期刊:
影响因子:
2.7
通讯作者:
Rufina Alamo
Rufina Alamo
中科院分区:
材料科学3区
文献类型:
--
作者:
Jun Xu;Günter Reiter;Rufina Alamo

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成核作用在聚合物结晶中起着至关重要的作用,其中链的连通性和多重的长度和时间尺度使得高分子链的结晶成核成为一个有趣而复杂的课题。尽管在过去的几十年里,人们对这一主题进行了深入的研究,但仍有许多悬而未决的问题需要回答。半结晶聚合物材料的最终性能受以下所有因素的影响:起始熔体、成核路径、层状晶体的组织和最终结晶结构的演变。在这一观点下,我们试图讨论一些尚待解决的问题和相应的概念:非平衡聚合物、自诱导成核、不同过程的微观动力学、聚合物片晶的亚稳性、成核所涉及的层序和协同性等,通过新概念、新理论和先进方法的结合来解决这些开放问题,有助于更深入地理解聚合物晶体成核的多方面过程。
Nucleation plays a vital role in polymer crystallization, in which chain connectivity and thus the multiple length and time scales make crystal nucleation of polymer chains an interesting but complex subject. Though the topic has been intensively studied in the past decades, there are still many open questions to answer. The final properties of semicrystalline polymer materials are affected by all of the following: the starting melt, paths of nucleation, organization of lamellar crystals and evolution of the final crystalline structures. In this viewpoint, we attempt to discuss some of the remaining open questions and corresponding concepts: non-equilibrated polymers, self-induced nucleation, microscopic kinetics of different processes, metastability of polymer lamellar crystals, hierarchical order and cooperativity involved in nucleation, etc. Addressing these open questions through a combination of novel concepts, new theories and advanced approaches provides a deeper understanding of the multifaceted process of crystal nucleation of polymers.
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