Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/95655
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
李榮和
Rong-Ho Lee
Wen-Chiung Su
Ru-Jong Jeng
關鍵字: Iterative synthesis;Dendrons;Polyurethanes;Shape memory materials
出版社: POLYMER
Project: Polymer, Volume 119, 16 June 2017, Pages 1-12
摘要: 
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.
URI: http://hdl.handle.net/11455/95655
DOI: 10.1016/j.polymer.2017.05.014
Appears in Collections:化學工程學系所

Files in This Item:
File Description SizeFormat Existing users please Login
1-s2.0-S0032386117304810-main.pdf期刊論文2.58 MBAdobe PDFThis file is only available in the university internal network   
Show full item record
 

Google ScholarTM

Check

Altmetric

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.