Synthesis of some methacrylate polymers containing pendant hydroxy group, investigate thermal and dielectrical properties

In this study, first, some compounds containing epoxide ring were synthesized by reaction of phenol derivativies with epichlorohydrin. Then, methacrylate monomers bearing hdyroxy side goup were synthesized from ring opening reaction of methacrylic acid with epoxide compounds. The preparation of homopolymer and copolymer was prepared by radical polymerization method. The FT-IR, 1H and 13C-NMR techniques for structural characterization were used mainly. The thermal behavior of polymers was measured by DSC and TGA techniques, the results were compared with each other. The average molecular weights and the polydispersities of polymers were measured by GPC technique. HBFPMA-co-BMA was prepared from 2-hydroxy-3-benzophenoxy propyl methacrylate (HBFPMA) and benzyl methacrylate (BMA) in different ratios. The monomer reactivity ratios of copolymer were calculated according to method of Kelen-Tüdös. Dielectric behavior of polymers was investigated as a function of temperature and frequency and associated with their structures. The activation energy for thermal degadation of poly(2-hdroxy-3-naphtoxy propyl methacrylate) was calculated according to the method of Flynn-Wall-Ozawa by using decomposition curves in different heating rations. The thermal degadation of poli(2-hydroxy-4-nitrophenoxy propyl methacrylate) was investigated by progammed heating from ambient temperature to 500oC under vacuum followed by the product collection. The cold ring fraction (CRF) of products volatile at degadation temperature but not at ambient temperature was identified by FT-IR, NMR, GS-MS. Based on degadation, the major product of CRF is 2-hydroxy-3-(4-nitrophenoxy) propyl methacrylate.