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Crystallization behavior and isothermal crystallization kinetics of polylactide/polystyrene‐ b ‐polybutadiene‐ b ‐polystyrene blends compatibilized with poly(styrene‐ ran ‐methyl acrylate)
Author(s) -
Wu Shouang,
Wang Bocheng,
Xu Xiaoling,
Wu Chonggang,
Hu Tao,
Zheng Xuan,
Gong Xinghou
Publication year - 2021
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.50933
Subject(s) - materials science , polybutadiene , polystyrene , crystallization , polymer chemistry , compatibilization , plasticizer , chemical engineering , methyl acrylate , copolymer , isothermal process , styrene , acrylate , composite material , polymer blend , polymer , thermodynamics , physics , engineering
The morphology, non‐isothermal and isothermal crystallization behavior, and spherulite growth of polylactide (PLA)/polystyrene‐ b ‐polybutadiene‐ b ‐polystyrene (SBS) blends were investigated in the presence of a poly(styrene‐ ran ‐methyl acrylate) (S–MA) compatibilizer synthesized using surfactant‐free emulsion copolymerization. Scanning electron microscopy revealed that the SBS dispersed‐phase became more uniform and refined as the amount of S–MA compatibilizer was increased from 0 to 3 wt%. Calorimetric characterization of the non‐isothermal and isothermal crystallization behavior analyzed using Avrami theory shows that the SBS in PLA shows plasticization and dilution effects simultaneously. When the PLA matrix chains do not move easily and/or its effective crystallization time window is narrow, the plasticization effect of the SBS is more significant. However, when the PLA matrix chains move more easily and/or its crsytallization window is wide, the dilution effects effect of the SBS is more notable. After the addition of S–MA, the plasticization and dilution effects were enhanced.