聚乳酸在层状苯基膦酸锌上的外延结晶:两种晶格匹配下相互垂直的棒状晶体

IF 2.7 3区 化学 Q2 POLYMER SCIENCE
Shi-Juan Ding, Ling-Na Cui, Yue-Jun Liu
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引用次数: 0

摘要

作为一种高效成核剂,本研究将层状苯基膦酸锌(PPZn)加入聚乳酸(PLA)中,研究聚乳酸在 PPZn 上的外延结晶。研究强调了相应的晶格间距变化、结晶形态和结晶结构,以揭示外延结晶机理。结果表明,随着 PPZn 含量的增加和退火时间的延长,通过 X 射线衍射(XRD)和偏振光学显微照片(POM)测量,观察到 PPZn 的晶格间距增大,并形成相互垂直的棒状晶体,这意味着随着聚乳酸 α 形晶体在其表面外延生长,PPZn 晶体的层间间距扩大,即外延结晶。具体来说,PPZn 晶体沿[010]和[100]方向外延生长出 "边上 "薄片,两种晶格匹配度极佳,可接受的不匹配度分别为 0.347% 和 7.5%。在外延结晶机制的支持下,聚乳酸/PPZn 复合材料断口形貌中观察到的丝状结构表明聚乳酸和 PPZn 之间具有很强的界面粘附性,这使得聚乳酸/PPZn 复合材料的冲击韧性比纯聚乳酸提高了 53.6%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Epitaxial crystallization of polylactic acid on layered zinc phenylphosphonate: Mutual perpendicular rodlike crystals under two lattice matchings

Epitaxial crystallization of polylactic acid on layered zinc phenylphosphonate: Mutual perpendicular rodlike crystals under two lattice matchings

As a highly effective nucleating agent, layered zinc phenylphosphonate (PPZn) is incorporated into polylactic acid (PLA) to investigate the epitaxial crystallization of PLA on PPZn in this study. The corresponding lattice spacing change, crystalline morphology, and crystalline structure are emphasized to reveal the epitaxial crystallization mechanism. As a result, with the increase of PPZn content and the annealing time, the increasing lattice spacing of PPZn and the formation of mutually perpendicular rodlike crystals are observed through x-ray diffraction (XRD) and polarized optical micrograph (POM) measurements, implying that the interlayer spacing of PPZn crystals is expanded as the PLA α-form crystals epitaxially grow on its surface, that is, epitaxial crystallization. To be specific, “edge on” lamellae epitaxial grow on the PPZn crystals along the [010] and [100] directions under two excellent lattice matchings, which possess acceptable mismatching of 0.347% and 7.5%, respectively. With the support of the epitaxial crystallization mechanism, the occurrence of the filamentous structure observed in the fracture morphology of PLA/PPZn composites suggests strong interfacial adhesion between PLA and PPZn, which makes the impact toughness of the PLA/PPZn composites increase by 53.6% compared with pure PLA.

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来源期刊
Journal of Applied Polymer Science
Journal of Applied Polymer Science 化学-高分子科学
CiteScore
5.70
自引率
10.00%
发文量
1280
审稿时长
2.7 months
期刊介绍: The Journal of Applied Polymer Science is the largest peer-reviewed publication in polymers, #3 by total citations, and features results with real-world impact on membranes, polysaccharides, and much more.
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