Ways to improve the heat resistance of plexiglass

There are many ways to improve the heat resistance of plexiglass, each way has its advantages and disadvantages. Some ways can improve the heat resistance of plexiglass, keep transparency, and make other properties decline. In order to improve the heat resistance and other properties of plexiglass at the same time, sometimes some improvement methods need to be used at the same time. For example, the main function of PHMI is to improve the heat resistance, and the main function of MAA is to improve the refractive index. In this way, PHMI is the main monomer, and MAA is the side monomer. The resulting copolymer not only has higher heat resistance, but also has higher refractive index. In this way, the terpolymer has higher heat resistance and lower hygroscopicity. The Vicat softening point temperature of mma-phmi-nma copolymer reaches 137 ℃, and it absorbs water The rate is about 25% lower than PMMA, and other properties are similar to PMMA. At present, scientists at home and abroad are still working hard to develop high-performance plexiglass, so as to expand its application scope and improve economic benefits.

The relatively large craze on the porthole of plexiglass was broken off along the craze direction by micro analysis. The craze section was observed by SEM, and the sampling position and method of craze sample were also discussed. The solvent craze of YB-2 polymethylmethacrylate produced by micro solvent corrosion and large amount of solvent corrosion was used to analyze the fracture morphology, and compared with that of porthole craze.

According to the test results and analysis, the craze of PMMA can be divided into solvent craze, stress craze and stress solvent craze. The craze produced by solvent is solvent craze, which is disordered and distributed in disorder. Solvent vapor in storage and manufacturing environment can make PMMA produce solvent craze.