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Effects of solvent perturbation on gelation driven by spinodal demixing

机译:溶剂微扰对旋节线分解驱动胶凝的影响

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摘要

We study effects of solvent perturbation on kinetic competition between spinodal demixing and gelation in agarose solutions at a concentration of 5 g/l. Two different cosolutes (tert-butyl alcohol and trimethyl amine N-oxide) known for altering in opposite way solvent-mediated interactions are chosen. By rheometry, static and dynamic light scattering experiments, we show that the cosolute presence shifts the boundary of the instability region of solution leaving unaffected temperature and polymer concentrature and polymer concentration values required for percolation. Results suggest that an appropriate choice of quenching temperature and solvent allows controlling the gelation time and the gel structural properties.
机译:我们研究了溶剂扰动对浓度为5 g / l的琼脂糖溶液中旋节线分解和凝胶化之间的动力学竞争的影响。选择两种已知以相反方式改变溶剂介导相互作用的不同溶质(叔丁醇和三甲胺N-氧化物)。通过流变学,静态和动态光散射实验,我们表明,固溶体的存在会改变溶液的不稳定性区域的边界,而不会影响温度和渗滤所需的聚合物浓度和聚合物浓度值。结果表明,适当选择淬火温度和溶剂可以控制胶凝时间和凝胶结构性质。

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