Synthesis And Properties Of Novel Poly(Aryl Ether Ketone) Contain Biphenyl And Ester In Main Chain

This dissertation reviewed the development and study of polyarylether ketone in recent years, five new types of polyarylether ketone which include biphenyl and ester group in main chain was synthesized in this paper.1. A new monomer 4,4'-di(4-phenoxybenzoyl)biphenyl(DPOBBP) was prepared by Fredel-Crafts reaction of 4-bromobenzoyl and biphenyl,followed by condensation with phenol in high boiling solvent NMP. A series of poly(ether ketone ketone ether ketone ketone)/ poly(ether ketone ketone)(PEKKEKK/PEKK) copolymers containing biphenyl group in main chain were prepared by low temperature solution polycondensation of DPOBBP as the third monomer with diphenyl ether(DPE) and isophthaloyl chloride(IPC) in the present of AlCl3/DCE/NMP as complex catalyst/solvent system. The copolymers were characterized by FT-IR, DSC, TG, XRD etc. The results indicate that the polymers have good crystallinity and high thermal stability.2. A series of poly(aryl ether ketone ketone ether ketone ketone)(PEKKEKK) which include biphenyl in main chain were prepared by low temperature solution polycondensation of 4,4'-di(4-phenoxybenzoyl)biphenyl with terephthaloyl chloride(TPC) and isophthaloyl chloride(IPC) in the presence of AlCl3/DCE/NMP as complex catalyst/solvent system. The polymers were characterized by FT-IR, DSC, TG, XRD etc. The results show that the glass transition temperature and the melting temperature increases gradually with the increasing of the ratio of TPC to IPC, the polymers are also crystalline and have high thermal stability and excellent chemical-resistent property.3. A series of poly(ether ketone ketone ether ketone ketone)/poly(ether sulfone ether ketone ketone)(PEKKEKK/PESEKK)copolymers containing biphenyl and sulfonel groups in main chain were synthesized by polycondensation of DPOBBP with DPODPS and TPC in the presence of AlCl3/DCE/NMP as complex catalyst/solvent system. The polymers were characterized by FT-IR, DSC, TG, XRD etc. The results show that the copolymers exhibit excellent thermal stability, high crystallinity and the melting temperature decreases with the decreasing of the ratio of DPOBBP to DPODPS. When the content of DPODPS is up to 50%, the copolymers is non-crystalline and has good solubility has improved.4. A series of random copolymers composed of poly(ether ester ester ether ketone ketone) and poly(ether ketone ketone) containing ester in main chain (PEEEEKK/PEKK) were prepared by low temperature solution polycondensation of paradioxybenzene di(4-phenoxybenzoate), diphenyl ether(DPE) and isophthaloyl chloride(IPC) in the presence of AlCl3/DCE/NMP as complex catalyst/solvent system. The copolymers were characterized by FT-IR, DSC, TG, XRD etc. The results indicate that the copolymers are all non-crystalline except for the polymer(d6) and exhibit good heat-resistant and solvent-resistant. The decomposition temperatures taken at 5% weight loss of the polymers in nitrogen are all over 430℃.5. Six kinds of random copolymers of poly(ether ester ester ether ketone ketone) (PEEEEKK) were prepared by low temperature solution polycondensation of paradioxybenzene di(4-phenoxybenzoate) with terephthaloyl chloride(TPC) and isophthaloyl chloride(IPC) in the presence of AlCl3/DCE/NMP as complex catalyst/solvent system. The copolymers were characterized by FT-IR, DSC, TG, XRD etc. The results show that the copolymers have excellent heat-resistance. The decomposition temperature taken at 5% weight loss of the polymers in nitrogen are all over 435℃. When the content of IPC is up to 80%, the melting temperature of polymers are lower than that of PEKK.