文献类型：期刊文献

英文题名：Influence of chain extenders on the structure and physical properties of water-borne polyurethaneurea-polymethylmethacrylate

作者：Xu, Q; Jing, H; Hu, CP; Ying, SK

机构：[1]E China Univ Sci & Technol, Inst Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2000

期号：5

起止页码：545

外文期刊名：ACTA POLYMERICA SINICA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000089889100005)】；

语种：英文

外文关键词：polyacrylate; polyurethaneurea; aqueous dispersion; chain extender; structure; property

摘要：Ethylenediamine (EDA) and water were used respectively as the chain extender in the preparation of polyurethaneurea-polymethylmethacrylate (PUA) hybrid aqueous dispersions. The relationship between the structures and physical properties for dried films of these water-borne PUAs was studied by means of DSC,DMA and FTIR. The testing results of DSC and DMA show that there is only one broad glass transition peak in the PUA prepared with water as extender exhibiting a compatible system while there are two glass transition temperatures in the film made with EDA as extender giving rise to phase separated morpholygy. Furthermore,as consistent with the DSC scan results and DMA measurements, the experimental results of FTIR indicate that there are stronger hydrogen bonding effect and much higher urea bond density in the EDA system than in the water system. In this case,the different morphologies for these two multi-component systems should be expected. A yield phenomenon appeared in the stress-strain curve of PUA prepared with water as extender while it was not observed in the EDA counterpart. The PUA synthesized with EDA as extender is superior to the water counterpart in solvent and water resistance as well as tensile strength,which could be related with the morphologies for such two extender systems studied in this paper.