Study On The Preparation And Antistatic Properties Of Modified POSS/PMMA Hybrid Materials

PMMA （polymethylmethacrylate）, commonly known as plexiglass,can meet theneeds of many fields such as construction, decoration, defense and aerospace for itslight weight, ease of processing and good light transmission. But the poor thermalstability and mechanical properties of PMMA and its electricity accumulation limitits application in some areas. Herein, we focused on the above problems of thePMMA material. POSS is the best choice to optimize the material for its hightemperature tolerance, easy to assemble and design and other performance andstructural advantages. At the same time, we explored the appropriate conductivefillers and antistatic agents to improve the antistatic properties while taking thethermal properties of materials into account.In the paper, we chose the silver nitrate as the main raw material and adoptedthe chemical reduction method supplemented by microwave irradiation technologyto prepare the silver nanoparticles. And we chose KH-550and TEOS as silica sourceto prepare the Ag/SiO₂composite particles. Transmission electron microscopy andUV-visible spectrophotometer were used to characterize the samples. The resultsshowed that: Ag nanoparticles and Ag/SiO₂composite particles have narrow sizedistribution and good distribution. By the spin coating method, we used the aboveAg nanoparticles and Ag/SiO₂composite particles to prepare the modified PMMAhybrid membranes. The curing process and antistatic properties of the membranehave also been studied. The results showed that: with the addition of the Agnanoparticles and Ag/SiO₂composite particles, surface resistivity of the PMMAmembrane materials has decreased. The surface resistivity dropped by three ordersof magnitude, and almost reached the antistatic requirements.In the paper, by the sol-gel method, we chose different functional groups ofsilane coupling agents as raw materials to prepare the POSS sol system withdifferent functional groups. The synthesis process parameters are: anhydrous ethanolas a solvent, formic acid as a catalyst,35°C water bath, thermostatic reaction7d. Bythe digital electrical resistance instrument, TG, DSC and other test equipments, andantistatic properties and thermal stability of POSS sol with different functionalgroups and their different content of PMMA membrane material were characterized.The results showed that the introduction of the POSS50with amino functional groupcan reduce the surface resistivity of the PMMA material significantly. At the sametime, the introduction of POSS will improve the thermal stability of PMMA. Whenthe mass fraction of POSS is15%, the glass transition temperature of the materialincreased by about25°C, the main reason is due to the specific spatial structure and inorganic skeleton.of POSS.Besides, we prepared the HEMA/POSS/PMMA hybrid membranes with theHEMA, POSS and MMA, and explored the antistatic properties of materials ofdifferent mass fraction of HEMA to determine the best ratio. The results showed thatwhen the mass fraction of HEMA is8%, the surface resistivity decreased by3to4orders of magnitude, and reached the anti-static requirements.