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標題: Iterative synthesis of monodisperse pendants for making comb-like polyurethanes
作者: Chien-Hsin Wu
Yu-Ching Chen
Shenghong A. Dai
Su-Chen Chen
Shih-Huang Tung
Rong-Ho Lee
Wen-Chiung Su
Ru-Jong Jeng
關鍵字: Iterative synthesis;Dendrons;Polyurethanes;Shape memory materials
Project: Polymer, Volume 119, 16 June 2017, Pages 1-12
Polyurethanes grafted with well-defined polar pendants were synthesized and investigated. A series of linear and dendritic poly(urea/malonamide)s with uniform chain length were first prepared from an iterative synthesis route, which is based on a dual-functional building block, 4-isocyanate-4´-(3,3-dimethyl-2,4-dioxo-azetidine)diphenyl methane (IDD). Moreover, side chain polyurethanes (SPUs) bearing azetidine-2,4-dione functional groups were prepared from one pot reaction for following post-functionalization of poly(urea/malonamide)s when IDD-diols were added to polyurethane prepolymers as chain extenders. Subsequently, the azetidine-2,4-dione functional groups on the SPUs underwent addition reactions with amino functional group containing dendritic or linear poly(urea/malonamide)s under mild condition, without the need of catalyst and protection/deprotection procedure to achieve polyurethanes grafted with well-defined pendants. Mechanical properties of these comb-like polyurethanes strongly depend on the architecture and the molecular length of poly(urea/malonamide) pendants, which could be adjusted by the grafting fractions of the dendritic or linear poly(urea/malonamide)s with various generations. These poly(urea/malonamide) pendants provided strong hydrogen bonding interactions to achieve physical crosslinking effects in the polyurethanes. Consequently, the polyurethanes with improved mechanical properties and sustained phase transition exhibit shape memory properties.
DOI: 10.1016/j.polymer.2017.05.014
Appears in Collections:化學工程學系所

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