Chloroprene (CP)-based block copolymers were synthesized via the RAFT-mediated emulsion polymerization of CP using polyacrylate macro-chain transfer agents (CTAs) via a one-pot (in-situ), two-step process. The quantitative formation of hydrophobic macro-CTA in the latex in the first step and subsequent incorporation of CP monomer into the latex using a high internal phase emulsion (HIPE) in the second step were observed to be crucial for producing poly(CP)-based block copolymers. The formation of poly(CP)-b-poly(n-butyl acrylate)s were confirmed by an evident shift in the SEC traces and the ¹H and DOSY NMR measurements. The block copolymers exhibited microphased structures composed of the poly(CP) matrix with low Tg (−30 °C) and the poly(nBA) spherical phase with lower Tg (−50 to −60 °C), as revealed by dynamic mechanical analysis (DMA) and transmission electron microscopy (TEM). This study represents the first report of the controlled synthesis of poly(CP)-based block copolymers by RAFT-mediated emulsion polymerization using HIPE.

氯丁二烯（CP）基嵌段共聚物是通过聚丙烯酸酯大分子转移剂（CTA）通过一锅（原位）两步法，通过RAFT介导的CP乳液聚合而合成的。观察到第一步中胶乳中疏水性大分子CTA的定量形成以及第二步中使用高内相乳液（HIPE）将​​CP单体掺入胶乳中对于生产基于聚CP的聚合物至关重要嵌段共聚物。聚（CP）-b-聚（丙烯酸正丁酯）的形成通过SEC迹线的明显偏移和¹H和DOSY NMR测量。动态力学分析表明，嵌段共聚物表现出由低Tg（-30°C）的聚（CP）基质和较低Tg（-50至-60°C）的聚（nBA）球形相组成的微相结构。 （DMA）和透射电子显微镜（TEM）。这项研究代表了首次报道使用HIPE通过RAFT介导的乳液聚合控制合成基于聚（CP）的嵌段共聚物。