文献类型：期刊文献

英文题名：Morphology and properties of polybutadiene/styrene, polybutadiene/acrylonitrile based polyurethane

作者：Yang, YR; Chen, YL; Wang, DN; Hu, CP

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

年份：2002

期号：6

起止页码：795

外文期刊名：ACTA POLYMERICA SINICA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000179874100019)】；

语种：英文

外文关键词：polybutadiene/styrene based polyurethane; polybutadiene/acrylonitrile base polyurethane; morphology; phase separation; properties

摘要：Polyurethane membranes based on toluene diisocyanate ( TDI), 1, 4-butanediol ( BDO) and hydroxyl terminated polybutadiene/styrene (HTBS) or hydroxyl terminated polybutadiene/acrylonitrile (HTBN) and hydroxyl-terminated polybutadiene ( HTPB) were synthesized by solution polymerization. The morphologies of these samples were characterized by DSC, FTIR and AFM measurements. DSC results,showed that the T-g of the soft segments for HTPB and HTBS were about only 3 similar to 6 degreesC higher than that of their pure soft segments. This indicated that the HTPB and HTBS based PU were well phase separated. The T-g of soft segments for HTBN, however, were about 11 similar to 15 degreesC higher than that of the pure soft segment, which revealed a lower microphase separation degree of HTBN based PU. This might be attributed to that the -CN groups in the soft segment could create hydrogen bonding with -NH groups in hard segment as proton receiver leading to partly mixing of soft and hard segment. Results of infrared analysis revealed that about 90 percent of urethane C=O groups formed hydrogen bonds between hard segments for both HTPB and HTBS based PU and about 84 percent for HTBN based PU. AFM results showed that the coarseness degree increased with increasing the hard segments content in HTBN based PU. HTBN and HTPB based PU showed two continuous phases when hard segment content reached 63 %, whereas hard segments formed the. only continuous phase in HTBS with the same hard segment content. The mechanical properties showed that the strength of HTBS and HTBN based PU were about 1.5 and 2 times higher than that of HTPB based PU respectively. The modulus and elongation of HTBN and HTBS based PU was also higher than that of HTPB based PU.