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Crystallisation and spherulite morphology of polylactide stereocomplex
Author(s) -
Shyr TienWei,
Ko HuanChieh,
Wu TzuMing,
Wu TzongMing
Publication year - 2019
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.5708
Subject(s) - spherulite (polymer physics) , materials science , crystallization , scanning electron microscope , morphology (biology) , optical microscope , chemical engineering , polymer chemistry , crystal (programming language) , composite material , crystallography , polymer , chemistry , biology , computer science , engineering , genetics , programming language
In this study we investigated the crystallisation behaviours of stereocomplex crystals in poly( l ‐lactic acid)/poly( d ‐lactic acid) ( PLLA/PDLA) blends (LD blends) of various weight ratios. The crystallisation and melting behaviours were studied using DSC, and the crystal structure was analysed through wide‐angle X‐ray diffraction. The morphology of homocrystals and stereocomplex crystals in the blends was examined using a hot‐stage polarising microscope and a scanning electron microscope. The DSC results showed that homocrystals and stereocomplex crystals were present in all LD blends except that with 50 wt% PLLA/50 wt% PDLA; in this blend, only stereocomplex crystals were present. The regime II → III transition temperature of stereocomplex crystals in a Lauritzen–Hoffman plot of the LD blends was determined to be 165 °C. A concentric spherulite consisting of stereocomplex crystals and homocrystals formed under two‐step isothermal crystallisation conditions with three growth stages was observed. The confined spherulitic growth rate in the concentric spherulite and the unrestricted spherulitic growth rate in individual spherulites were also analysed. © 2018 Society of Chemical Industry