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首页> 外文期刊>Polymer bulletin >Synthesis and characterization of poly(styrene-block-n-butyl acrylate) pentablock copolymer via RAFT emulsion polymerization mediated by amphiphilic macroRAFT agent combined with pre-emulsion technology
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Synthesis and characterization of poly(styrene-block-n-butyl acrylate) pentablock copolymer via RAFT emulsion polymerization mediated by amphiphilic macroRAFT agent combined with pre-emulsion technology

机译：两亲macroRAFT试剂结合预乳液技术介导的RAFT乳液聚合合成苯乙烯嵌段共聚物（五嵌段共聚物）及其表征。

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摘要

Well-defined poly(styrene-block-n-butyl acrylate) pentablock copolymers were synthesized via RAFT (reversible addition-fragmentation chain transfer) emulsion polymerization with the combination of using a carefully designed amphiphilic macroRAFT at the nucleation stage and the pre-emulsion technology at the growth stage. The multiblock copolymers were produced within seven hours with narrow latex particle size distribution, high solid content and good latex stability. The thermal stability, thermal processability, microphase separation and mechanical properties of multiblock copolymers as well as corresponding random and blending (co)polymers were also investigated by thermogravimetric analysis (TG) instrument, Haake torque rheometer, differential scanning calorimetry (DSC) and scanning electron microscope (SEM), tensile and impact tests, respectively. The TG results revealed the multiblock copolymer has a good thermal stability with the initial decomposition temperature higher than 350 A degrees C. Rheological results demonstrated that the multiblock copolymers have higher torque values than corresponding random and blending (co)polymers. DSC and SEM analysis denoted that there exists phase separation of multiblock and blending (co)polymers. For multiblock copolymer, the impact strength increased by 27.39 % to 7. 44 kJ m(-2) with the composition of 60 wt% of styrene units and 40 wt% of n-butyl acrylate units. The tensile strength of multiblock copolymer increased with the increase of styrene composition.
机译：通过在成核阶段使用精心设计的两亲macroRAFT和预乳液技术的组合，通过RAFT（可逆加成-断裂链转移）乳液聚合合成定义明确的聚（苯乙烯-丙烯酸正丁酯）五嵌段共聚物。在成长阶段。该多嵌段共聚物在七个小时内生产，具有窄的胶乳粒度分布，高固含量和良好的胶乳稳定性。还通过热重分析（TG）仪器，Haake扭矩流变仪，差示扫描量热法（DSC）和扫描电子对多嵌段共聚物以及相应的无规和共混（共）聚合物的热稳定性，热加工性，微相分离和力学性能进行了研究。显微镜（SEM），拉伸和冲击测试。 TG结果表明，该多嵌段共聚物具有良好的热稳定性，其初始分解温度高于350 A℃。流变学结果表明，该多嵌段共聚物比相应的无规和共混（共）聚合物具有更高的扭矩值。 DSC和SEM分析表明存在多嵌段和共混（共）聚合物的相分离。对于多嵌段共聚物，其冲击强度提高了27.39％，达到了7。44 kJ m（-2），组成为60 wt％的苯乙烯单元和40 wt％的丙烯酸正丁酯单元。多嵌段共聚物的拉伸强度随苯乙烯组成的增加而增加。

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