ATR-FTIR研究超支化聚酯对PEG型聚氨酯弹性体的力学性能及形态的影响

Study on Effect of Hyperbranched Polyester on the Mechanical Properties and Morphology of PEG Polyurethane Elastomer by ATR-FTIR

为改善聚乙二醇(PEG)型聚氨酯弹性体的力学性能,将改性超支化聚酯(HBP)引入形成共混体系,利用衰减全反射傅里叶变换红外光谱(ATR-FTIR)研究了聚氨酯胶片的化学结构。结果表明,超支化聚酯对PEG型聚氨酯弹性体具有较好的增强增韧作用,当加入0.4%的第三代超支化聚酯时,聚氨酯弹性体的拉伸强度比空白胶片提高了2.53倍,达到了4.70 MPa;当加入1.6%的第一代超支化聚酯时,聚氨酯弹性体胶片的断裂伸长率比空白胶片提高了1.43倍,达到了438%。超支化聚酯的加入显著提高了聚氨酯的总氢键化程度和聚氨酯软硬段的微相分离程度,使得聚氨酯弹性体胶片的力学性能得以提高。

In order to enhance the mechanical properties of polyethylene glycol（PEG） polyurethane elastomer,the modified hyperbranched polyester（HBP） was introduced.The chemical structures of HBP/PEG polyurethane films were analyzed by attenuated total reflection-Fourier transfoum infrared speetrum（ATR-FTIR）.The results indicate that with the modified hyperbranched polyester added,the tensile strength and elongation at break of PEG polyurethane elastomer are improved obviously.When the content of hyperbranched polyester of the third generation is 0.4%,the resultant elastomer has the best tensile strength,which increases 2.53 times.When the content of hyperbranched polyester of the first generation rises up to 1.6%,the resultant elastomer has the best elongation at break,which increases 1.43 times.The degree of the total hydrogen bonding and the degree of microphase separation are increased,which enhance the mechanical properties of PEG polyurethane elastomer.