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Thermo‐responsive shape memory properties based on polylactic acid and styrene‐butadiene‐styrene block copolymer
Author(s) -
Azizul Rahim Fathin Hani,
Saleh Abdul Aziz,
Shuib Raa Khimi,
Ku Ishak Ku Marsilla,
Abdul Hamid Zuratul Ain,
Abdullah Muhammad Khalil,
Shafiq Mohamad Danial,
Rusli Arjulizan
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.51000
Subject(s) - materials science , polylactic acid , copolymer , crystallinity , styrene butadiene , composite material , styrene , scanning electron microscope , compression molding , dynamic mechanical analysis , ultimate tensile strength , morphology (biology) , molding (decorative) , polymer chemistry , polymer , mold , biology , genetics
Abstract This study aims to compare thermal, mechanical, and shape memory behavior of polylactic acid (PLA) blended with different structures of styrene‐butadiene‐styrene block copolymer (SBS), namely linear SBS (L‐SBS), and radial SBS (R‐SBS). The amount of L‐SBS and R‐SBS added was varied between 10 and 70 wt%, and the blending process was carried out using an internal mixer at 180°C before the shaping process by the compression molding. An improvement in the degree of crystallinity was observed across the entire composition range with less pronounced transition temperature change. Tensile strength and modulus of PLA/L‐SBS blends were higher than PLA/R‐SBS blends across all composition ranges. The results also revealed that the shape fixing ratio (R f ) and recovery ratio (R r ) of PLA/L‐SBS were higher than PLA/R‐SBS, with PLA70/SBS30 showed the best shape memory behavior. The morphology characteristics of the blend were also examined with the scanning electron microscope.