1,4-二乙炔苯与1,4-丁炔二醇的共聚及表征研究

The Synthesis and Characterization of Copolymers of 1,4-diethynylbenzene and 1,4-butynediol

本文以(Ph_3P)_2 PdCl_2为催化剂,用各种比例的对二乙炔苯(DEB)与1,4-丁炔二醇(BD)合成出共聚物及两种单体的均聚物。共聚物为褐黑色,不溶不熔。单体配比中DEB比例越高,共聚物交联度和比重越大,产率越高,溶胀度越小。单体摩尔比DEB/BD≥1/2时,共聚物最良溶剂为苯,溶度参数(δP)为9.15卡^(0.5)·cm^(-1.5),而DEB/BD=1/5时,共聚物最良溶剂为无水乙醇,8p=12.7卡^(0.5)·cm^(-1.5).对均聚物及共聚物做了红外光谱表征并讨论了聚合反应机理。

In this paper,the copolymers of 1,4-diethynylbenzene and 1,4-butynediol with various kinds of ratio and their homopolymers aresynthesized using(Ph_3P)_2PdCl_2 as catalyst.The copolymers are of black-brown color,insoluble in benzene,CHCl_3,THF and ethyl alcohol andinfusible until 350℃.The higher the ratio of DEB in copolymerization, the larger the density(d_4^(25)) of copolymers,the higher the yield of copoly-mers and the less the swellability(θ_p)and average molecular weight(?)between crosslinks((?)_c).When DEB/BD≥1/2(mole ratio of monomers),the best solvent of copolymers is benzene and the solubility parameter(δ_P)is 9.15 cal^0.5·cm^(-1.5),when DEB/BD=1/5,the best solvent of copolymer isethyl alcohol and δ_P is 12.7 cal^0.5·cm^(-1.5).IR spectra of homopolymersand copolymers arc drawn and studied and reaction mechanism ofcopolymerization is suggested.