Abstract

Mixed 18% solutions of cellulose and PAN terpolymer containing methyl acrylate and methylsulfonate comonomers in N-methylmorpholine-N-oxide have been obtained over the entire range of compositions. All the obtained systems based on cellulose and PAN are biphasic, and the morphological features of the emulsions change from highly dispersed isotropic to fibrillar depending on the phase composition and the intensity of the deformation effect. At high shear stresses that emerge during preparation of the solutions in an extruder, all emulsions are characterized by the same microheterogeneous morphology, which is transformed into fibrillar by deformation. An IR spectroscopic study has established that in the preparation process, specific interactions occur between the functional groups of macromolecules of the cocomponents, leading to the formation of PAN/cellulose associates, which undergo hydrophobic repulsion along the interfaces. It is this process that initiates the fibrillation of the cellulose solution phase in the presence of a PAN solution during deformation. The rheological behavior of mixed solutions over the entire range of concentrations in continuous and dynamic modes at temperatures of 110–130°C is a direct consequence of the phase composition and morphological transformations occurring during deformation. Emulsion compositions characterized by viscoelastic properties that make it possible to successfully form composite fibers have been chosen.

中文翻译：

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N-甲基吗啉-N-氧化物中纤维素和 PAN 共聚物联合溶液的结构-形态和流变特征

摘要

含有丙烯酸甲酯和甲基磺酸酯共聚单体的纤维素和 PAN 三元共聚物在N中的 18% 混合溶液已经在整个组合物范围内获得了-甲基吗啉-N-氧化物。所有基于纤维素和PAN的体系都是双相的，乳液的形态特征根据相组成和变形效应的强度从高度分散的各向同性变为纤维状。在挤出机中制备溶液过程中出现的高剪切应力下，所有乳液都具有相同的微异质形态，通过变形转变成纤维状。红外光谱研究表明，在制备过程中，共组分大分子的官能团之间会发生特定的相互作用，导致形成 PAN/纤维素缔合体，并沿着界面经历疏水排斥。正是这个过程在变形过程中在 PAN 溶液存在的情况下引发了纤维素溶液相的原纤化。在 110–130°C 温度下，混合溶液在整个浓度范围内以连续和动态模式的流变行为是变形过程中发生的相组成和形态转变的直接结果。已经选择了以粘弹性为特征的乳液组合物，使得能够成功地形成复合纤维。在 110–130°C 温度下，混合溶液在整个浓度范围内以连续和动态模式的流变行为是变形过程中发生的相组成和形态转变的直接结果。已经选择了以粘弹性为特征的乳液组合物，使得能够成功地形成复合纤维。在 110–130°C 温度下，混合溶液在整个浓度范围内以连续和动态模式的流变行为是变形过程中发生的相组成和形态转变的直接结果。已经选择了以粘弹性为特征的乳液组合物，使得能够成功地形成复合纤维。