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
中科院分区:
文献类型:
--
作者:
Huang Z;Zhong M;Yang H;Xu E;Ji D;Joseph P;Zhang RC
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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