Preparation And Thermal Properties Of Poss Based Heat-resistant Hybrid Modifiers MMA-MAH-MAPOSS And ST-MAH-MAPOSS

The new era of society is also a new era of materials,Traditional single materials have their own characteristics.Inorganic materials have the characteristics of heat resistance,electrical properties,high rigidity and hardness,Organic materials are light,easy to process and tough.However,a single material is clearly unable to meet the needs of rapid social development,and new composite materials for specific needs have emerged in some special industries and fields.The existing composite materials are mainly prepared by physical blending or chemical hybridization.The biggest problem with physical blending is that the composite components are not well distributed evenly.Organic and inorganic hybrid materials not only achieve bonding at the molecular level.It can also combine the excellent characteristics of each part.This thesis mainly explores the preparation of binary and ternary organic-inorganic hybrid copolymer modifiers by MAPOSS chemical modification of PMMA,MMA-MAH copolymer and ST-MAH copolymer.The thermal properties of each modifier were characterized and compared with the thermal properties of the pure organic copolymer before modification.MAPOSS is a polyhedral oligomeric silsesquioxane(POSS)synthesized by KH570 through hydrolysis and condensation two-step method.It has an organic-inorganic hybrid composed of Si-O-Si inorganic skeleton and 8 identical R-based organic chains.The structure has the advantages of POSS-specific nano-size effect,intramolecular hybrid structure,thermal stability and flame retardancy,structural designability,solubility and reactivity.In this paper,the introduction of hybrid modification of MAPOSS effectively improves the thermal stability of the polymer during thermal decomposition.The Tg of PMMA is increased to above 120 °C,and the residual carbon rate is up to 5.23%.The Tg of MMA-MAH polymer is increased to above 130 °C,and the carbon residue rate is up to 7.3%.The carbon residue rate is increased to 15.6% without affecting the Tg of the ST-MAH polymer.