聚酯改性环氧乙烷四氢呋喃/多异氰酸酯N100黏合剂的力学性能

Mechanical Properties of Polyester Modified PET/Polyisocyanates N100 Binder

为提升环氧乙烷四氢呋喃(PET)/N100黏合剂体系的高温力学性能,分别将聚己二酸己二醇酯(PHA)、聚己二酸乙二醇酯(PEA)、聚己二酸新戊二醇酯(PNA)、聚己内酯(PCL)引入到PET/N100体系中并进行性能测试。X射线衍射表明,受N100的影响,改性黏合剂胶片不存在结晶衍射峰;利用红外光谱研究了聚酯加入后H键合羰基的含量的变化;低场核磁共振测试结果表明,聚酯的引入主要通过增加交联网络中耐高温的交联部分的含量来提升黏合剂的高温力学强度;差示扫描量热及力学性能测试结果表明,相容性较好的PHA,PNA,PCL引入黏合剂体系后常温下最大拉伸强度可达2 MPa左右,且温度升高至80℃时仍保有1.84 MPa的断裂强度。

In order to improve the high temperature mechanical properties of the PET/polyisocyanates N100 binder system,polyhexylene adipate(PHA),polyethylene adipate(PEA),poly(neopentyl glycol)adipate(PNA),polycaprolactone(PCL)was introduced into the PET/N100 system respectively.X-ray diffraction results show that there is no crystal diffraction peaks in the modified binder film due to the influence of N100.The change of the number of H-bonded carbonyl groups after the polyester addition was studied by infrared spectroscopy.Low field nuclear magnetic resonance test results show that with the introduction of polyester,the high temperature mechanical strength of the binder is improved by increasing the content of the cross-linked portions of the cross-linked network in high temperature resistance;the DSC and mechanical properties test results show that the PHA,PNA and PCL with good compatibility can reach the maximum tensile strength at room temperature up to 2 MPa after being introduced into the binder system,and the fracture strength of 1.84 MPa is still maintained when the temperature is raised to 80℃.