期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 302, 期 1-3, 页码 559-567出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2007.03.043
关键词
polyurethanes; silicas; hybrids; crosslinking
资金
- National Research Foundation of Korea [R15-2006-022-01001-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Using a sol-gel process nanometer-scale silicas were incorporated into waterborne polyurethanes (PUs) which were synthesized from isophoronediisocyanate (IM), poly(tetramethyleneglycol) (PTMG), dimethylolpropionic acid (DMPA), triethylamine (TEA), diethylenetriamine (DETA) and 3-aminopropyltriethoxysilane as coupling agent. Thermal, mechanical, and dynamic mechanical properties of the hybrid composite have been studied. Si-29-NMR spectra gave evidence of condensation reaction between silica and silanes encaping the PU prepolymers, whereas transmission electron microscopy (TEM) showed the high connectivity of hybrid composites. It was found that greater thermal and mechanical properties of waterborne PU/silica hybrid composite were obtained when chemical networks were formed between PU and silica. (C) 2007 Elsevier B.V. All rights reserved.
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