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

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℃.