非均一交联高分子网络的结构表征

均一交联高分子网络在良溶剂和劣溶剂中平衡溶胀比Q和Q_0的比值依从Q/Q_0=1+k(Q-1)的关系,k是一个与溶剂性质和网络种类有关的恒定常数.当k已知时,测定非均一网络在良、劣两种溶剂中溶胀比Q~*和Q_0~*,依 Z=k(Q~*-1)(Q_0~*-1)/[(1-k)(Q~*-1)-(Q_0~*-1)],可得非均一因子Z及其他网络结构参数.用此方法研究了自由基引发的苯乙烯-二乙烯基苯无规共聚网络,所得结果符合聚合和网络形成机理的预计.

CHARACTERIZATION OF THE STRUCTURE OF INHOMOGENEOUS NETWORKS

The quotient of swelling ratio of homogeneous network in good solvent Q to that in poor solvent Qv satisfy the relationship Q/Q0 = 1+k(Q-1) in which k is a constant depending on the structure of the solvent and the monomer units of the network. If the constant k is pre-determined, the heteregeneity factor Z of the inhomogeneous real networks could be evaluated fromZ = k(Q -1)(Q0-1)/[(1-k)(Q-1)-(Q0 - 1)]The proposed method was sucessfully applied o the characterization of the inhomogeneous network of divinylbenzene-styrene random copo ymer initiated by free radicals. The variation of the estimated structural parameters are in accord with the prediction made from the mechanism of random copolymerization and network formation.