相容剂对弹性体 TPU／POE 共混体系流变性的影响

摘要

我们通过动态频率、应变流变仪研究了添加POE－g－MAH、 POE－g－NH2相容剂的TPU／POE共混物三元共混体系在200℃下的动态流变学行为。随POE－g－MAH、 POE－g－NH2添加量的增加，共混体系的动态模量G′也显著增加，而且曲线随着频率增大而逐渐靠近。这是因为POE分子链上的酸酐及氨基基团与TPU分子上的氨基甲酸酯发生反应， TPU与POE之间形成的界面区和界面粘结力增加，从而使相态结构的稳定性提高。 POE－g－MAH、 POE－g－NH2的加入，导致二元共混斜率完全偏离线性关系，极大地提高了POE与TPU的相容能力。%The blends of thermoplastic urethane ( TPU) and polyolefin elastomer ( POE) were produced with the aid of the compatibilizers, and their dynamic rheological behaviors under 200 ℃ were investigated by a dynamic frequency strain-rheometer.Results showed that the dynamic modulis of the blends increase significantly with increasing content of POE-g-MAH or POE-g-NH2 , and the storage and the loss moduli were getting close to each other radually as the frequency increases.The reactions between the anhydride and amino groups on the POE molecular chains and the carbamates on the TPU molecules resulted in a larger interfacial layer and stronger interfacial adhesion stress, which improved the stabilities of the phase structures.The addition of POE-g-MAH or POE-g-NH2 caused the slope of the binary blend deviating from the linear relation completely and improved the compatibility between POE and TPU greatly.