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首页> 外文期刊>RSC Advances >Insight into the role of bound water of a nucleating agent in polymer nucleation: a comparative study of anhydrous and monohydrated orotic acid on crystallization of poly(L-lactic acid)
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Insight into the role of bound water of a nucleating agent in polymer nucleation: a comparative study of anhydrous and monohydrated orotic acid on crystallization of poly(L-lactic acid)

机译：洞察成核剂结合水在聚合物成核中的作用：无水和一水乳清酸对聚L-乳酸结晶的比较研究

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摘要

To gain an insight into the role of bound water of a nucleating agent in polymer nucleation, a biobased nucleating agent, orotic acid (OA), was selected as a model to investigate the effects on crystallization of poly(L-lactic acid) (PLLA). In such a context, two commercially available types of OA in anhydrous (OA-a) and monohydrated (OA-m) forms were melt mixed with PLLA, and their nucleation effectiveness on nonisothermal and isothermal melt crystallization of PLLA was comparatively studied. Results indicate that both forms of OA can significantly improve nonisothermal crystallization temperature and degree of crystallinity, overall isothermal crystallization rate, as well as nucleation density of PLLA. Interestingly, OA-a shows more prominent nucleation efficiency than OA-m. That is, the bound water of OA-m and its dehydration transition play a negative role in nucleation effects on PLLA crystallization. It is attributed to the deteriorated dispersion and the reduced active concentration of dehydration-transformed OA-a in PLLA/OA-m blends, as compared with pristine OA-a in PLLA/OA-a blends. Furthermore, an epitaxial mechanism is proposed to explain the nucleation phenomenon of PLLA/OA blends.
机译：为了深入了解成核剂结合水在聚合物成核中的作用，选择了一种生物基成核剂乳清酸（OA）作为模型来研究聚（ L -乳酸）（PLLA）。在这种情况下，将两种市售类型的无水（OA-a）和一水合（OA-m）形式的OA与PLLA熔融混合，并比较研究了它们在PLLA的非等温和等温熔体结晶中的成核效果。结果表明，两种形式的OA均可显着提高非等温结晶温度和结晶度，总等温结晶速率以及PLLA的成核密度。有趣的是，OA-a的成核效率比OA-m更高。也就是说，OA-m的结合水及其脱水转变对PLLA结晶的成核作用起着负面作用。与PLLA / OA-a共混物中的原始OA-a相比，其归因于PLLA / OA-m共混物中分散变质和脱水转化的OA-a活性浓度降低。此外，提出了一种外延机制来解释PLLA / OA共混物的成核现象。

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