In-situ isothermal crystallization of poly(L-lactide)

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Huang, Zirui, Zhong, Meiling, Yang, Haibo, Xu, Enqin, Ji, Dehui, Joseph, Paul ORCID: 0000-0002-5503-9979 and Zhang, Ri-Chao ORCID: 0000-0003-2355-1959 (2021) In-situ isothermal crystallization of poly(L-lactide). Polymers, 13 (19). p. 3377. ISSN 2073-4360

Abstract

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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Item type Article
URI https://vuir.vu.edu.au/id/eprint/42805
DOI 10.3390/polym13193377
Subjects Current > FOR (2020) Classification > 3403 Macromolecular and materials chemistry
Current > FOR (2020) Classification > 4004 Chemical engineering
Current > Division/Research > Institute for Sustainable Industries and Liveable Cities
Keywords poly(L-lactide), PLLA, wide angle X-ray diffraction, WAXD, polarized optical microscopes, POM, morphology
Citations in Scopus 3 - View on Scopus
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