In-Situ Isothermal Crystallization of Poly(l-lactide).

In-Situ Isothermal Crystallization of Poly(l-lactide).
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聚(L-丙交酯)的原位等温结晶

DOI:
10.3390/polym13193377
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发表时间:
2021-09-30
期刊:
影响因子:
5
通讯作者:
Zhang RC
Zhang RC
中科院分区:
工程技术3区
文献类型:
--
作者:
Huang Z;Zhong M;Yang H;Xu E;Ji D;Joseph P;Zhang RC

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采用原位广角X射线衍射(WAXD)和偏光显微镜(POM)研究了聚乳酸(PLLA)的等温结晶过程。结果表明,PLLA在高温下形成球晶,而在低温下形成不规则的形貌。这可归因于PLLA在不同温度下的不同结晶速率。在低温下,成核速率快,因此链扩散非常慢,导致形成不完美的晶体。另一方面,在高温下,成核速率慢,链扩散快,导致形成完美的晶体。Avrami指数值随温度的变化进一步证实了晶体形貌特征的变化趋势。
The isothermal crystallization of poly(l-lactide) (PLLA) has been investigated by in-situ wide angle X-ray diffraction (WAXD) and polarized optical microscopes (POM) equipped with a hot-stage accessory. Results showed that the spherulites of PLLA were formed at high temperature, whereas irregular morphology was observed under a low temperature. This can be attributed to the varying rates of crystallization of PLLA at different temperatures. At low temperatures, the nucleation rate is fast and hence the chains diffuse very slow, resulting in the formation of imperfect crystals. On the other hand, at high temperatures, the nucleation rate is slow and the chains diffuse fast, leading to the formation of perfect crystals. The change in the value of the Avrami exponent with temperature further verifies the varying trend in the morphological feature of the crystals.
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发表时间: 2005-07-25
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影响因子: 4.6
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