A series of heterografted PVSt-g-(PS/PE) based on polystyrene (PS) backbone with mixed PS and polyethylene (PE) side chains was obtained, in which the branching density of PVSt-g-(PS/PE) was above 72%. Because of the extremely short backbone, long side chains and high branching density in these comb-like copolymers, the topological structure of PVSt-g-(PS/PE) was similar to asymmetrical star copolymers. By adjusting the molar ratio of PS and PE side chains, the total PS (PVSt backbone + side chain PS) volume fraction in the graft copolymers could be adjusted. PVSt-g-(PS/PE) showed a microphase-separated structure at the melt state, depending on the composition of the copolymers. When the volume fraction of PS changed from 42.7% to 76.9%, the microphase-separated structures changed from lamellar phase structure to cylindrical morphology. Furthermore, all the PVSt-g-(PS/PE) samples with the microphase-separated structure showed a typical rheological behavior of cross-linked network-like structure, but the change trend of melt elasticity of the copolymer with increasing temperature depended on the microphase-separated structure.

得到了一系列基于聚苯乙烯（PS）主链的杂化接枝PVSt- g-（PS / PE），具有混合的PS和聚乙烯（PE）侧链，其中PVSt- g-（PS / PE）的支化密度高于72％。由于这些梳状共聚物中的骨架极短，侧链长且支链密度高，PVSt- g-（PS / PE）的拓扑结构与不对称星形共聚物相似。通过调节PS和PE侧链的摩尔比，可以调节接枝共聚物中总PS（PVSt主链+侧链PS）的体积分数。PVSt- g ^-（PS / PE）在熔融状态下显示出微相分离的结构，这取决于共聚物的组成。当PS的体积分数从42.7％变为76.9％时，微相分离的结构从层状相变为圆柱状。此外，所有具有微相分离结构的PVSt- g-（PS / PE）样品均表现出典型的交联网络状结构的流变行为，但共聚物的熔体弹性随温度升高的变化趋势取决于温度。微相分离的结构。