Thermoreversible Gelation Driven by Coil-to-Helix Transition of Polymers
Thermoreversible Gelation Driven by Coil-to-Helix Transition of Polymers
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DOI：
10.1063/1.1764120
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发表时间：
2003-07
期刊：
影响因子：
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通讯作者：
F. Tanaka;Y. Tamura
中科院分区：
文献类型：
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作者：
F. Tanaka;Y. Tamura
本文从理论上研究了聚合物链上螺旋聚集所驱动的热可逆凝胶化作用。两种根本不同的情况：(I)单螺旋的多重结合，以及(Ii)具有多个k的多螺旋的结合(如双螺旋(k=2)、三螺旋(k=3)等)。是根据不同的方程来处理的。作为聚合物浓度和温度的函数，导出了聚合物链(或多螺旋的链的集合)上的螺旋长度分布。将理论计算的溶液中总螺旋含量与不同聚合物浓度下ι-卡拉胶溶液的旋光实验数据进行了比较。结果表明，在低温下，从网络态到束态(对、三重态等)的转变非常剧烈。为了证实这种网络/配对转变，我们对形成氢键拉链状交联的聚合物溶液进行了蒙特卡罗模拟。
This paper theoretically studies thermoreversible gelation driven by aggregation of helices formed on the polymer chains. Two fundamentally different cases of (i) multiple association of single helices, and (ii) association by multiple helices with multiplicity k (such as double helices (k = 2), triple helices (k = 3), etc.) are treated on the basis of different equations. The helix length distribution on a polymer chain (or assemble of chains for multiple helices) is derived as a function of polymer concentration and temperature. Theretical calculation of the total helix content in the solution is compared with experimental data of optical rotation in ι‐carrageenan solutions at different polymer concentrations. It is shown that at low temperature there is a sharp transition from network to bundle state (pair, triplet, etc.). To confirm such a network/pairing transition, we carried out Monte Carlo simulation of polymer solution in which hydrogen‐bonded zipper‐like crosslinks are formed.