摘要
利用乙酸酐对自身可以水分散的超支化水性聚氨酯(WHBPU)进行封端,得到了乙酰基封端的超支化水性聚氨酯(AWHBPU).研究了超支化水性聚氨酯共混改性聚氨酯乳液的剪切黏度、粒径分布以及表面张力.实验结果表明,对WHBPU羟基的封闭可以有效降低共混聚氨酯乳液的黏度;AWHBPU共混乳液偏离牛顿流体程度明显下降;粒径和表面张力测试表明,超支化水性聚氨酯进入胶束内部引起粒径上升是引起黏度下降的重要原因.
A acetyl-terminated waterborne hyperbranched polyurethane （AWHBPU） was synthesized by acetic anhydride and waterborne hyperbranched polyurethane （WHBPU）. The viscosity, particle size distribution and surface tension of waterborne polyurethane emulsion modified by waterborne hyperbranched polyurethane were studied. Results show that the viscosity of the modified emulsion can be reduced by AWHBPU blending, while non-Newtonian index of the emulsion modified by AWHBPU increases. The test results of particle size distribution and surface tension show that the main cause of the viscosity declining is the particle size increasing, which is induced by AWHBPU accessing to the inside of waterborne polyurethane micelle.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2012年第11期1195-1199,共5页
Transactions of Beijing Institute of Technology
关键词
超支化
水性聚氨酯
剪切黏度
表面张力
hyperbranched polymers
waterborne polyurethane
viscosity
surface tension
作者简介
田星（1982-），男，博士生，E-mail：1090021@bit．edu．cn
通信作者：罗运军（1964-），男，教授，博士生导师，E—mail：yjluo@bit．edu．cn
