SYNTHESIS AND PROPERTIES OF POLY(ARYL ETHER KETONE)S CONTAINING MULTI-CARBONYL IN THE MAIN CHAIN

Abstract

Poly(aryl ether ketone)s are considered as a kind of important high-performance polymers due to their excellent thermal stability,resistance to corrosion,creep and other outstanding properties.However,the PEK' s insolubility in common solutions and high melt point restrict its processing and application.In this paper,above all,a novel monomer,1,3-di(4-chloro formyl benzoyl) benzene(DMBC) was synthesised and confirmed by FT-IR,~1H-NMR and so on.Then three poly(aryl ether ketone)s containing multi-carbonly in their main chains were prepared by low temperature solution polycondensation of DMBC with 4,4′-diphenoxydiphenylsolfone(DPODPS),1,3-di(4-phenoxybenzoylbenzene(i-DPOPKK)and 1,4-di(4-phenoxybenzoyl)benzene(p-DPOPKK) in 1,2-dichloroethane(DCE) with the presence of AlCl_3 and DMAc.The structure of polymers(P_a,P_b,P_c) obtained were characterized by FT-IR and~1H-NMR.The inherent viscosities(η_(inh)) of them are above 0.70 dL/g.WAXD studies reveal that the three polymers have the same crystallization diffraction pattern as PEKK,which belongs to rhombic system,so all of them also belong to rhombic system.Thermal properties of the polymers were obtained by DSC and TGA.DSC analysis indicates that compared to PEKEKK and PEKK,the glass transition temperature(T_g) of polymers is improved,and the melting temperature(T_m) decreases.All of the polymers also show high thermal stability with 5% weight-loss temperature over 519℃ according to TGA.Compared to PEKEKK and PEKK,the solubility of polymers is also improved,especially with the introducing of sulfonyl and more isophthaloyl.