Synthesis, Characterization, and Functionalization of Hyperbranched Poly(3,4-epoxycyclohexanemethanol)
Synthesis, Characterization, and Functionalization of Hyperbranched Poly(3,4-epoxycyclohexanemethanol)
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DOI：
10.1021/ma071756m
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发表时间：
2007-11
期刊：
影响因子：
5.5
通讯作者：
Y. Kitajyo;Yuki Kinugawa;M. Tamaki;H. Kaga;Noriaki Kaneko;T. Satoh;T. Kakuchi
中科院分区：
文献类型：
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作者：
Y. Kitajyo;Yuki Kinugawa;M. Tamaki;H. Kaga;Noriaki Kaneko;T. Satoh;T. Kakuchi
以三氟化硼二乙醚（BF3·OEt2）为催化剂，进行了脂环环氧醇3,4-环氧环己烯乙醇(1)的阳离子开环聚合反应。1的非均相聚合得到无凝胶聚合物（poly-1）。13C核磁共振测量结果表明，poly-1为超支化聚合物，具有多个末端单元，其支化度（DBs）在0.36 ~ 0.42之间。通过与线性聚（3,4-环氧环己烯乙醇）（聚-3）的物理性质比较，研究了聚-1的三维性质。聚-1的黏度和Mark - Houwink指数α远低于聚-3，表明聚-1在溶液中具有致密的构象。此外，poly-1的玻璃化转变温度（Tg）约为105℃，也低于poly-3。合成了一种具有疏水聚1核和亲水l-天冬氨酸壳的新型两亲性树突状聚合物（poly-1ASP）。
The cationic ring-opening polymerizations of an alicyclic epoxyalcohol, 3,4-epoxycyclohexanemethanol (1), were carried out using boron trifluoride diethyletherate (BF3·OEt2) as a catalyst. Polymerization of 1 heterogeneously proceeded to yield a gel-free polymer (poly-1). On the basis of the 13C NMR measurement, poly-1 was a hyperbranched polymer with numerous terminal units, and the degrees of branching (DBs) of poly-1 were in the range from 0.36 to 0.42. The three-dimensional property of poly-1 was investigated by comparison to the physical property of a linear poly(3,4-epoxycyclohexanemethanol) (poly-3). The viscosity and Mark−Houwink exponent α of poly-1 were much lower than those of poly-3, suggesting that poly-1 had a compact conformation in solution. In addition, the glass-transition temperature (Tg) of poly-1 was ca. 105 °C, which was also lower than that of poly-3. A novel amphiphilic dendritic polymer (poly-1ASP) having a hydrophobic poly-1 core and hydrophilic l-aspartic acid shell was synthesi...