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Interfacial compatibility of super‐tough poly(lactic acid)/polyurethane blends investigated by positron annihilation lifetime spectroscopy
Author(s) -
Zhao Xipo,
Yu Xiaolei,
Chen Hao,
Zhou Weiyi,
Fang Pengfei,
Peng Shaoxian
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.46596
Subject(s) - polyurethane , materials science , compatibility (geochemistry) , polyester , polymer , positron annihilation spectroscopy , toughness , composite material , polyol , polymer chemistry , chemical engineering , positron , positron annihilation , physics , quantum mechanics , engineering , electron
Supertough polylactide (PLA)/polyurethane (PU) blends were prepared by reactive blending of PLA with polyester polyol and toluene‐2,4‐diisocyanate. The free volume and interfacial compatibility between the two polymers were investigated by positron annihilation lifetime spectroscopy. The PU particles dispersed homogeneously in the PLA matrix and self‐assembled into a subinclusion microstructure, resulting in fibrils and significant plastic deformation occurs during impact process. More phase interface and free volume cavities formed between PLA and PU boundary because of a good interfacial compatibility between the two polymers, leading to smaller sizes of free volume cavities, and the increasing of the number of these cavities. Therefore, the toughness of PLA was greatly improved by blending PU. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46596.