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Preparation and characterization of hydrophilic temperature‐dependent polyurethane containing the grafted poly(N‐isopropylacrylamide)
Author(s) -
Chung YongChan,
Bae Jin Cheol,
Choi Jae Won,
Chun Byoung Chul
Publication year - 2019
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.25172
Subject(s) - materials science , swelling , polyurethane , ultimate tensile strength , glass transition , monomer , poly(n isopropylacrylamide) , lower critical solution temperature , composite material , polymer chemistry , chemical engineering , polymer , copolymer , engineering
The polyurethane (PU) structure is modified with dimethylolpropionic acid (DMPA) and poly(N‐isopropylacrylamide; poly[IPA]) to prepare hydrophilic temperature‐dependent PU that is investigated with reference to the degree of crosslinking, thermal properties of soft segment, tensile and shape memory performance, hydrophilic conversion of surface, and temperature‐dependent water swelling and water vapor permeability (WVP). The thermal properties of soft segment (melting, crystallization, and glass transition) are significantly affected by poly(IPA). Breaking tensile stress also increases with increasing IPA monomer content due to crosslinking effect but breaking tensile strain does not significantly decrease with increasing IPA monomer content. Shape recovery capability at 10°C steeply inclines to over 90% from 46.9% for unmodified PU by the grafting of poly(IPA), whereas shape retention at −25°C does not decrease below 90% with the increase in IPA content. Poly(IPA)‐grafted PU can display temperature‐dependent control of water swelling and WVP due to transformation of the grafted poly(IPA) depending on the surrounding temperature. POLYM. ENG. SCI., 59:1719–1728 2019. © 2019 Society of Plastics Engineers