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Flow‐induced crystallization of polylactide stereocomplex under pressure
Author(s) -
Song YingNan,
Zhao QingXiang,
Yang ShuGui,
Ru JiaFeng,
Lin JianMei,
Xu JiaZhuang,
Lei Jun,
Li ZhongMing
Publication year - 2018
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.46378
Subject(s) - crystallization , materials science , nucleation , shear flow , differential scanning calorimetry , shear rate , polymer , homogeneous , shear (geology) , chemical engineering , crystallization of polymers , composite material , polymer chemistry , thermodynamics , rheology , physics , engineering
Although shear and pressure fields always coexist in practical polymer processing, their combined influence on the crystallization behavior of polylactide stereocomplex (SC) is ambiguous due to the limit of experiment device. In that case, a homemade device was employed to prepare samples under the coexistence of shear and pressure and explore the crystallization behavior of SC. Differential scanning calorimetry and synchrotron radiation were used to investigate the combined effect of shear flow and pressure on SC crystallization. The results show that shear flow was helpful for SC formation. Shear flow promoted the phase mixing of the polymer blends and improved the nucleation efficiency of SC. Pressure had a negative effect on SC formation because of the decrease in free volume. Regard to polylactide homogeneous (HC), pressure played a positive role on HC formation. Pressure suppressed the formation of SC network which could impede HC generation. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46378.