【摘要】 在制备六氯环三膦腈的过程中将八氯环四膦腈很好地分离出来,并以八氯环四膦腈作为聚合单体在300℃下熔融开环聚合8h,可得到较高收率(46%)的聚二氯膦腈中间体,进一步被乙醇钠取代可制得聚二乙氧基膦腈弹性体。两种环膦腈单体以及聚合物,通过IR,1HNMR,31PNMR,熔点测定、动态热机械分析等手段进行了表征;通过半经验法计算了(—PN—)基团在弹性体内对结构单元摩尔体积的贡献Vr(—NP—)=34.06cm3/mol,并讨论了聚二乙氧基膦腈的分子构象,结果表明其高分子链呈(tc′)构象,内转角φ近似为56.3°。更多还原

【Abstract】 Attempts have been made to synthesize poly(diethoxyphosphanzene) via thermal polymerization of octachlorocyclotetraphosphazene. The structures of the monomer and polymer were investigated by means of IR and ~ 1H-NMR. Dynamic mechanical behavior and some physical properties of the poly(diethoxyphosphanzene), such as glass transition temperature, density and intrinsic viscosity number, were discussed. The molar volume of the constitutional unit (—PN—) was calculated via the experimental data by a semiempirical method. A primary goal of the present study is to extend our understanding of the molecular structures and the conformational properties of polyphosphazene by performing theoretical calculations.更多还原