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Nitroxide mediated living radical polymerization of styrene onto poly (vinyl chloride)

机译：一氧化氮介导的苯乙烯在聚氯乙烯上的活性自由基聚合

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摘要

Nitroxide-mediated 'living' free radical polymerisation (LREP) was employed for the first time to prepare graft copolymer by having arylated poly (vinyl chloride) (PVC-Ph) as a backbone and polystyrene (PS) as branches. The graft copolymerization of styrene was initiated by arylated PVC carrying 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) groups as a macroinitiator. Thus, the arylated PVC was prepared in the mild conditions and these reaction conditions could overcome the problem of gelation and crosslinking in polymers. Then, 1-hydroxy TEMPO was synthesized by the reduction of TEMPO with sodium ascorbate. This functional nitroxyl compound was coupled with brominated arylated PVC (PVC-Ph-Br). The resulting macro-initiator (PVC-Ph-TEMPO) for 'living' free radical polymerization was then heated in the presence of styrene to form graft copolymer. DSC, GPC, 1{sup left}(HNMR), and FT-IR spectroscopy were employed to investigate the structure of the polymers.
机译：首次使用氧化亚氮介导的“活性”自由基聚合（LREP），以芳基化聚氯乙烯（PVC-Ph）为骨架，聚苯乙烯（PS）为支链，制备接枝共聚物。苯乙烯的接枝共聚反应是通过带有2,2,6,6-四甲基-1-哌啶基氧基（TEMPO）基团作为大分子引发剂的芳基化PVC引发的。因此，在温和的条件下制备芳基化的PVC，这些反应条件可以克服聚合物中胶凝和交联的问题。然后，通过用抗坏血酸钠还原TEMPO来合成1-羟基TEMPO。该功能性的硝酰基化合物与溴化的芳基化PVC（PVC-Ph-Br）偶联。然后在苯乙烯的存在下加热所得的用于“活性”自由基聚合的大分子引发剂（PVC-Ph-TEMPO），以形成接枝共聚物。用DSC，GPC，1 {HupNMR}和FT-IR光谱研究聚合物的结构。

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