In polymer structure design, branching can occur randomly or by reactions designed to target specific architectures. This microstructural property affects many physical properties such as polydispersity, molecular weight and polymer chain size. A new reversible addition-fragmentation chain transfer/macromolecular design through interchange of xanthates (RAFT/MADIX) agents with polyvinyl alcohol was performed. In the process, polyvinyl alcohol (PVA), potassium hydroxide, carbon disulfide and derivatives of benzoylchloride were employed, and thus, three new graft chain transfer agents (g-CTA) were synthesized. PVA-g-PS graft copolymers were obtained using MADIX agents by changing various factors including initiator, amount of monomer and reaction time. While the linear increase in molecular weight with monomer consumption was observed, the polymerization reaction was kinetically detected to be the first order. Significant progress has been made in controlling the molecular weight distribution of the polymer by RAFT polymerization. The synthesized graft copolymers were characterized using FTIR, ¹H NMR, ¹³C NMR, GPC and DSC techniques. Also, the three new graft chain transfer agents were characterized by elemental analysis and the existence of xanthate -S-(C = S) O-PVA was confirmed. The synthesis of the copolymer with the MADIX agent, which has an almost infinite number of design possibilities, was successfully achieved. As a result, well-defined statistical PVA-g-PS copolymers having a narrow molecular weight distribution (PDI 1.23–1.47) were obtained.

在聚合物结构设计中，支化可以随机发生，也可以通过针对特定结构设计的反应发生。这种微观结构特性会影响许多物理特性，例如多分散性、分子量和聚合物链大小。通过黄原酸酯 (RAFT/MADIX) 试剂与聚乙烯醇的互换，进行了一种新的可逆加成-断裂链转移/大分子设计。在此过程中，利用聚乙烯醇（PVA）、氢氧化钾、二硫化碳和苯甲酰氯衍生物，合成了三种新型接枝链转移剂（g-CTA）。PVA-g-PS 接枝共聚物是使用 MADIX 试剂通过改变引发剂、单体量和反应时间等各种因素获得的。虽然观察到分子量随单体消耗线性增加，动力学检测到聚合反应为一级反应。通过 RAFT 聚合在控制聚合物的分子量分布方面取得了重大进展。合成的接枝共聚物使用 FTIR 表征，¹ H NMR、¹³ C NMR、GPC 和 DSC 技术。此外，三种新的接枝链转移剂通过元素分析进行​​了表征，并证实了黄原酸 -S-(C = S) O-PVA 的存在。共聚物与 MADIX 试剂的合成已成功实现，该试剂具有几乎无限的设计可能性。结果，获得了具有窄分子量分布（PDI 1.23-1.47）的明确定义的统计PVA-g-PS共聚物。