The Synthesis And Characterization Of Novel PES Substituted With Hydroxyl Group And The Studies On Its Hybrids With Silica

Sol-gel reactions for silicon and metal alkoxides have been considered to offer unique routes in the manufactureof ceramic, inorganic glass, and organic polymer hybrid materials.Hybrid materials combinating of organic and inorganic two-phase characteristics are attracting increasing attention. Organic and inorganic membrane materials prepared by sol-gel hybrid are widely used in scientific applications.This paper is based on research of PES materials, and the research mainly includes the use of molecular design of monomer by-side with hydroxyphenyl new poly aryl ether sulfone, the use of side-chain hydroxyl group and the Tetraethylorthosilicate after hydrolysis, and new organic -- inorganic hybrid material gained in two steps.Firstly, through GPC test, we synthesized MPPES and HPPES with high molecular weight. The introduction of the side-chain hydroxyl polyethersulfone from weak polarity into polar, resulted in weak non-polar solvent dissolved in chloroform and insoluble in most polar solvents; because of intermolecular hydrogen bonding of HPPES, the glass transition temperature increased from 160℃to 210℃, which is the same as the introduction of the hydroxyl polymer in the high temperature, thermal stability increased. WAXD test results showed that MPPES and HPPES were amorphous polymers.Secondly, HPPES is the matrix, through experiment determining the optimum Sol conditions, choosing NMP as a reaction solvent. Thus HPPES-SiO2 was gained which was two-phase material, and the inorganic particles evenly distributed in the polymer matrix of hybrid materials. Hybrid materials were characterized by FT-IR, confirming in 1070 cm-1 the emergence of a significant inorganic - organic combination of absorption peaks. That polymer - inorganic phase is close through the bond. HPPES has a good role on the in-situ SiO2 surface modification. The inorganic particles could be dispersed well in the matrix. XRD tests showed that SiO2 distributed as the amorphous form into HPPES matrix. Under the optimal condition it showed that the amount of inorganic increased probability of collision.Tg value of the HPPES with rich hydroxyl is higher than MPPES, the consumption hydroxyl of polymer, resulted in a hybrid material lower Tg<210℃. when the inorganic phase amount increased gradually , SiO2 particles is restricted the movement of the matrix. while the glass transition temperature of the hybrid material increased, until higher than 210℃. TGA analysis in the air condition showed the hybrid material in the two obvious weight loss steps, the first stage of the weight loss reflected the inorganic component continued to condense under high temperature and some small molecules may overflow. the second weight loss step stemed from the oxidative degradation of the polymer molecular chain.