摘要
通过氧化-还原引发自由基聚合反应,实现了乙烯基三乙氧基硅烷改性水性聚氨酯共聚反应。应用红外光谱测试(FTIR-ATR)表征了共聚产物,根据差示扫描量热测试(DSC)、热失重分析(TG)、X-射线衍射分析(XRD)测试分析了改性前后水性聚氨酯的热性能、结晶性能。实验结果表明,在偶联剂单体加入量为水性聚氨酯质量的2%时,体系交联度可达到12%,明显改善了水性聚氨酯疏水性,其耐水性提高了54%,耐丙酮性提高21%,断裂强度提高23 MPa。
A radical copolymerization of vinyl silanes （A-151） with waterborne polyurethane （WPU） was conducted with N,N dimethyl aniline and benzoperoxide redox system as initiators. The reaction mechanism and structure of copolymers were confirmed by FI＇IR-ATR, XRD, DSC, TG analysis by the mechanical properties, water and solvent resistance tests. The results showed that modified WPU film had better water resistance when mass fraction of A-151 was 2% and crosslinking degree was 12%. The water, acetone resistance of modified WPU increased by 54% and 21% respectively and breaking tenacity enhanced by 23 MPa compared with original WPU film.
出处
《皮革科学与工程》
CAS
2015年第5期45-49,共5页
Leather Science and Engineering
基金
质检公益性行业科研专项项目(201310066)
关键词
水性聚氨酯
乙烯基三乙氧基硅烷
自由基聚合
交联
waterborne polyurethane
vinyl silane coupling agent
radical copolymerization
cross linking
