ATRC法合成蝌蚪型及杠铃型环状聚合物

发布时间：2019-07-12 07:09

【摘要】：具有特定臂数的星型聚合物通过分子内链末端偶联反应可以制备出不同形状的环状聚合物。文中以三臂含溴代异丁酸酯为引发剂(Tri-Br),通过先核后臂的方法制备出三臂星型聚苯乙烯(PSt_3)。然后将合成的三臂星型聚苯乙烯(PSt_3)在极稀浓度条件下,利用原子转移自由基偶合(ATRC)技术合成一端为大分子环状,一端为线型聚合物链的蝌蚪型环状聚合物(Tadpole-PSt_3)。最后在高浓度条件下,通过ATRC技术,使三臂聚苯乙烯未参与分子内偶联的线型链段进行分子间偶合制备出杠铃型环状聚合物(Barbell-PSt_3)。使用核磁共振、凝胶渗透色谱对聚合物结构进行了表征。结果表明,成功合成了纯度较高的蝌蚪型环状聚合物,同时进一步合成了中间为聚合物链段两端为大环的杠铃型环状聚合物。
[Abstract]:Different shapes of annular polymers can be prepared by intramolecular chain end coupling reaction with star polymers with a specific number of arms. In this paper, three-arm star polystyrene (PSt_3) was prepared by nucleating and then arm with triarm brominated isobutyrate as initiator (Tri-Br). Then the three-arm star polystyrene (PSt_3) was synthesized by atom transfer radical coupling (ATRC) technique at very dilute concentration to synthesize tadpole annular polymer (Tadpole-PSt_3) with one end of macromolecular ring and one end of linear polymer chain. Finally, barbell cyclic polymer (Barbell-PSt_3) was prepared by intermolecular coupling of linear segments of triarm polystyrene without intramolecular coupling at high concentration by ATRC technique. The structure of the polymer was characterized by nuclear magnetic resonance (NMR) and gel osmotic chromatography (GPC). The results show that the tadpole annular polymer with high purity has been successfully synthesized, and the barbell ring polymer with large ring at both ends of the intermediate polymer segment has been further synthesized.
【作者单位】：常州大学材料科学与工程学院江苏省材料表面科学与技术重点实验室江苏省光伏科学与工程协同创新中心;南京工业大学材料科学与工程学院;
【基金】：国家自然科学基金资助项目(21474010,21104006) 中国博士后科学基金(2016M601785) 江苏省高校自然科学基金资助项目(15KJB50002) 江苏高校优势学科建设工程(PAPD)
【分类号】：O631.5

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