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首页> 外文期刊>Journal of Applied Polymer Science >Elongational flow studies on the phase separation of hydroxypropylcellulose solution
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Elongational flow studies on the phase separation of hydroxypropylcellulose solution

机译：羟丙基纤维素溶液相分离的伸长流动研究

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The phase separation of hydroxypropylcellulose (HPC) in a mixed solvent of glycerol and water was investigated by an elongational flow birefringence method. In the one-phase region, the elongational flow birefringence had the characteristics of a typical coil-stretch transition-like pattern with a critical elongational strain rate (epsilon)over dot(c)(.)(epsilon)over dot(c) increased monotonously with temperature, but in the vicinity of the phase-separation point, (epsilon)over dot(c) began to decrease even in the one-phase region. In the two-phase region, the flow-induced birefringence pattern contained both a rigid rod-like response and the coil-stretch transition-like response of a flexible polymer. The appearance of the rod-like birefringence pattern indicates the association of HPC chains to form a precursor of the liquid-crystalline phase formation. (C) 2002 Wiley Periodicals, Inc. [References: 24]
机译：通过伸长流动双折射法研究了羟丙基纤维素（HPC）在甘油和水的混合溶剂中的相分离。在单相区域中，伸长流动双折射具有典型的线圈拉伸过渡样图案的特征，其在点（c）上的临界伸长应变率（ε）在点（c）上的ε增加。随温度单调变化，但在相分离点附近，即使在单相区域，点（c）上的ε也开始减少。在两相区域中，流动引起的双折射图案既包含刚性杆状响应，又包含柔性聚合物的线圈-拉伸转变状响应。棒状双折射图案的出现表明HPC链缔合以形成液晶相形成的前体。 （C）2002 Wiley Periodicals，Inc. [参考：24]

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