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Thermoreversible Gelation Interfering with Phase Separation in Multicomponent Mixtures of Associating Polymers
Macromolecules ( IF 5.1 ) Pub Date : 2022-06-14 , DOI: 10.1021/acs.macromol.2c00921 Fumihiko Tanaka 1
Macromolecules ( IF 5.1 ) Pub Date : 2022-06-14 , DOI: 10.1021/acs.macromol.2c00921 Fumihiko Tanaka 1
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A theoretical scheme is developed to study thermoreversible gelation interfering with liquid–liquid phase separation in mixtures of reactive (associating) molecules carrying the number fi (i = 1, 2, ..., s) of functional groups Ai capable of forming cross-link junctions. The number of molecular species s is arbitrary. The formed three-dimensional polymer networks are assumed to include multiple cross-link junctions containing an arbitrary number ki of functional groups Ai of each component. By extension of the conventional cascade theory of gelation to reversible multiple cross-links, the average molecular weights of the cross-linked three-dimensional polymers are calculated, from which the gel-point condition is derived. Also, the chemical potentials of each component and the Gibbs matrix are explicitly calculated, and the stability limit of a homogeneous phase (the spinodal condition) is derived. The relationship between the gel-point condition and the spinodal condition is studied in detail. Some important applications to ternary cross-links made up of three-component functional groups are suggested. A general strategy to construct ternary phase diagrams and their temperature–concentration cross sections is presented, on the basis of which the potential temperature dependence of the spinodal lines (UCST and LCST) in relation to heat-setting and cold-setting gelation is discussed.
中文翻译：
热可逆凝胶化对缔合聚合物多组分混合物相分离的干扰
开发了一种理论方案来研究热可逆凝胶化干扰在反应性（缔合）分子混合物中的液-液相分离，这些分子携带的数量为f i ( i = 1, 2, ..., s ) 的官能团 A i能够形成交联点。分子种类s的数量是任意的。假设形成的三维聚合物网络包括多个交联结，其中包含任意数量k i的官能团 A i每个组件的。通过将传统的凝胶级联理论扩展到可逆的多重交联，计算了交联的三维聚合物的平均分子量，由此推导出凝胶点条件。此外，还明确计算了每个组分的化学势和吉布斯矩阵，并导出了均相的稳定性极限（旋节线条件）。详细研究了凝胶点条件和旋节线条件之间的关系。提出了由三组分官能团组成的三元交联的一些重要应用。提出了构建三元相图及其温度-浓度截面的一般策略，
更新日期：2022-06-14
中文翻译：
热可逆凝胶化对缔合聚合物多组分混合物相分离的干扰
开发了一种理论方案来研究热可逆凝胶化干扰在反应性（缔合）分子混合物中的液-液相分离，这些分子携带的数量为f i ( i = 1, 2, ..., s ) 的官能团 A i能够形成交联点。分子种类s的数量是任意的。假设形成的三维聚合物网络包括多个交联结，其中包含任意数量k i的官能团 A i每个组件的。通过将传统的凝胶级联理论扩展到可逆的多重交联，计算了交联的三维聚合物的平均分子量，由此推导出凝胶点条件。此外，还明确计算了每个组分的化学势和吉布斯矩阵，并导出了均相的稳定性极限（旋节线条件）。详细研究了凝胶点条件和旋节线条件之间的关系。提出了由三组分官能团组成的三元交联的一些重要应用。提出了构建三元相图及其温度-浓度截面的一般策略，
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