Cascade of transitions of polyelectrolytes in poor solvents
Cascade of transitions of polyelectrolytes in poor solvents
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DOI：
10.1021/ma9507958
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发表时间：
1996-04-08
期刊：
影响因子：
5.5
通讯作者：
Obukhov, SP
中科院分区：
文献类型：
--
作者：
Dobrynin, AV;Rubinstein, M;Obukhov, SP
我们建立了一个均匀带电聚合物在贫溶剂中稀溶液构象的标度模型。我们发现，有一个范围内的温度和电荷密度的聚合物有一个项链状的形状与紧凑的珠子加入窄字符串。在这种构象中，链的自由能低于圆柱形球，因为项链的长度大于圆柱体的长度，并且与链上的总电荷成比例。随着链上电荷的变化或温度的变化，项链在不同珠子数量的项链之间经历了一连串的突然转变。
We develop a scaling model for the dilute solution conformation of a uniformly charged polymer in a poor solvent. We find that there is a range of temperatures and charge densities for which the polymer has a necklace-like shape with compact beads joined by narrow strings. The free energy of a polyelectrolyte in this conformation is lower than in a cylindrical globule because the length of the necklace is larger than that of a cylinder and is proportional to the total charge on the chain. With changing charge on the chain or temperature, the polyelectrolyte undergoes a cascade of abrupt transitions between necklaces with different numbers of beads.