Preparation and Properties of Branched Polybutylenesuccinate

摘要

To obtain long branched polybutylene succinate (PBS), modified PBSs were prepared by introducing a branching agent, trimethylol propane (TMP), to the polycon-densation system of succinic acid and 1,4-butanediol. Molecular parameters such as absolute molecular weight and root-mean-square (RMS) radius of the modified PBSs were measured by gel permeation chromatography (GPC) with a multiangle laser light-scattering (MALLS) detector. The RMS radius of TMPO5, PBS prepared by incor-porating 0.5 wt % TMP during polycondensation, was the smallest of all PBSs tested at the same molecular weight. The notable shear thinning and much reduced loss tangent for TMPO5 qualitatively supported the difference in their molecular structures pre-dicted by GPC. The analytical results indicated that introducing 0.5 wt % TMP pro-duced PBS with chain branches long enough to produce molecular entanglements.