Postpolymerization modification of polynorbornene side chains via tetramethyl guanidine promoted esterification
Postpolymerization modification of polynorbornene side chains via tetramethyl guanidine promoted esterification
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DOI：
10.1002/pola.28269
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发表时间：
2016-12
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影响因子：
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通讯作者：
Jing Xu;Hongwei Zhang;Lu Wang;Meng Chen;D. Luo
中科院分区：
文献类型：
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作者：
Jing Xu;Hongwei Zhang;Lu Wang;Meng Chen;D. Luo
我们证明含有初级活化溴化物部分的聚降冰片烯是一种用于后聚合改性的新型化学可改性平台。聚合物P0是在Grubbs第三代(G-III)催化剂的辅助下，通过单体1的开环复分解聚合合成的。随后，在温和的化学计量条件下，在1,1,3,3-四甲基胍（TMG）存在下，将P0与正己酸、山梨酸、间甲基苯甲酸或4-硝基苯甲酸混合进行亲核取代，生成功能化聚合物P1-P4。 NMR 结果证实了反应位点的完全转化，并证明了 TMG 促进酯化的“点击”性质。通过热重分析和差示扫描量热法研究了所有聚合物样品的热稳定性和玻璃化转变行为。 © 2016 Wiley periodicals, Inc. J. Polym。科学，A 部分：聚合物。化学。 2016年
We demonstrate that polynorbornene containing primary activated bromide moieties is a novel chemically modifiable platform for postpolymerization modification. Polymer P0 was synthesized via ring-opening metathesis polymerization of monomer 1 with the assistance of Grubbs third generation (G-III) catalyst. Subsequently, nucleophilic substitution was conducted by mixing P0 with n-caproic acid, sorbic acid, m-toluic acid or 4-nitrobenzoic acid in the presence of 1,1,3,3-tetramethylguanidine (TMG) under mild and stoichiometric condition to generate functionalized polymers P1–P4. NMR results approved full conversion of the reactive sites and exemplified the “click” nature of TMG promoted esterification. Thermal stability and glass transition behaviors of all the polymer samples were investigated by thermal gravimetric analysis and differential scanning calorimetry. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016