Gel formation and liquid crystalline order in cellulose triacetate solutions
Gel formation and liquid crystalline order in cellulose triacetate solutions
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DOI：
10.1016/0032-3861(83)90195-7
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发表时间：
1983-07
期刊：
影响因子：
4.6
通讯作者：
G. Meeten;P. Navard
中科院分区：
文献类型：
--
作者：
G. Meeten;P. Navard
用光学显微镜、旋光法和圆二色谱研究了三醋酸酯纤维素溶液在三氟乙酸溶液中形成液晶态的过程。当临界浓度低于34g/100ml时，形成清澈的各向同性溶液。浓度比这更高的溶液处于胆甾型液晶状态。如果向溶液中加入水，如果聚合物浓度超过临界值，就会形成凝胶相。我们用Pincus-de Gennes理论解释我们的观察结果，并表明液晶有序的形成既涉及分子间作用力，也涉及分子内作用力。
The formation of a liquid crystalline state of cellulose triacetate solution in trifluoroacetic acid was studied using optical microscopy, polarimetry and circular dichroism measurements. Below a critical concentration of 34 g 100 ml a clear isotropic solution was formed. Solutions more concentrated than this were in the cholesteric liquid crystalline state. If water was added to the solution, a gel phase was formed if the polymer concentration was above a critical value. We interpret our observations in terms of the Pincus-de Gennes theory and show that the formation of liquid crystalline order involves both inter-and intramolecular forces.