单酚脱盐法联苯聚醚酮的合成

SYNTHESIS OF AROMATIC POLYETHERKETONES WITH BIPHENYL FROM MONOPHENOXIDE

以Ｆｒｉｅｓ重排法合成新单体，用单酚脱盐法制备了含刚性链段的联苯聚醚酮。经ＤＳＣ、ＩＲ和ＷＡＸＤ对聚合物的研究表明，联苯聚醚酮（ＤＰＥＫ）与聚醚醚酮（ＰＥＥＫ）均属正交晶系Ｐｂｃｎ空间群，而ＤＰＥＫ的玻璃化转变温度比ＰＥＥＫ高约４０℃。

The rigid homopolymers with biphenyl structure (DPEK where D represents biphenyl unit) were synthesized from monophenoxides by new monomers,4 (4 halobenzoly) 4′ hydroxybiphenyl, which were got through Fries rearrangement reaction, the general properties of polymer were studied by IR, DSC and WAXD. The results indicate that condensations proceed with very high para selectivity, giving crystalline polyethers with melting points at about 425 ℃. The crystal structures of DPEK have a close resenblance to that of poly(ether ether ketone) (PEEK), also belonging to the same space group (Pbcn) with the dimension of a=0.766 nm, b=0.606 nm and c=1.15 nm. DSC scans of DPEK show that the glass transition temperature ( T g) of DPEK is about 40 ℃ more than that of PEEK, which is used as high performance engineering materials.