| 초록 |
PS-block-poly(ethylene-co-1-butene)-block-PS (SEBS) can be prepared by hydrogenation of PS-block-polybutadiene-block-PS (SBS), but the process is costly and tedious. Thus, we envisioned a new one-pot SEBS-like triblock copolymer synthetic scheme to grow PO chains from styrene moiety-carrying diorganozinc compounds by coordinative chain transfer polymerization (CCTP), followed by anionic styrene polymerization using a specially designed initiator, allowing PS chain growth from the styrene moieties as well as the Zn−C sites. We prepared it highly pure by developing synthesis of (CH2=CHC6H4CH2CH2CH2)2Zn, which is stable and crystalline solid. This enabled the production of PS-block-poly(ethylene-co-1-hexene)-block-PS (SEHS), which exhibited a stress−strain curve similar to that of the commercial-grade SEBS. The SEHS dispersed better in a polypropylene (PP) matrix, allowing it to act as a better toughening agent for PP blending than the commercial-grade SEBS. |
