异丙醇助溶剂对聚丙烯酸水溶液流变性和可纺性的影响,Journal of Polymer Science

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异丙醇助溶剂对聚丙烯酸水溶液流变性和可纺性的影响
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2023-04-24 , DOI: 10.1002/pol.20220719
Sunilkumar Khandavalli ₁ , Yingying Chen ₁ , Nisha Sharma‐Nene ₁ , Kashyap Sundara Rajan ₂ , Samrat Sur ₂ , Jonathan P. Rothstein ₂ , Kimberley S. Reeves ₃ , David A. Cullen ₃ , K. C. Neyerlin ₁ , Scott A. Mauger ₁ , Michael Ulsh ₁

Affiliation

我们研究了二元水-醇溶剂混合物中的醇组分（异丙醇，IPA）对剪切和拉伸流变性能的影响，以及静电纺丝中粘弹性对聚丙烯酸（PAA）纤维形成的作用。水-IPA 混合物中 PAA 的比粘度η _sp和拉伸弛豫时间λ _E的缩放比较表明，与无盐聚电解质水溶液相比，PAA 具有更强的缩放作用，但非缠结状态中的η _sp表现出类似聚电解质的性质。缩放η _sp ~ c ^0.5对于所有 IPA%。这种偏差表明 IPA 诱导 PAA 缔合/聚集。然而，与纠缠态相比，作为 IPA% 函数的η _sp和λ _E幅度之间的趋势因浓度而异。η _sp及其弹性模量表现出最大值，而λ _E随着 IPA% 单调增加，表明各种相互作用的复杂相互作用决定了它们在水-IPA 混合物中的结构，以不同的方式影响它们的剪切和拉伸响应。静电纺丝实验表明，增加 IPA% 可减少珠状纤维和均匀纤维的出现。使用无量纲数的分析表明，IPA 增强了它们的弹性，以及随之而来的对喷射/长丝在静电纺丝过程中断裂的稳定作用，在改善它们的纤维形成方面发挥了作用。

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Effect of isopropanol cosolvent on the rheology and spinnability of aqueous polyacrylic acid solutions

We investigate the effect of alcohol fraction (isopropanol, IPA) in a binary water-alcohol solvent mixture on the shear and extensional rheological properties, as well as the role of viscoelasticity on fiber formation of poly(acrylic acid) (PAA) in electrospinning. Comparison of the scaling of both specific viscosities η_sp and extensional relaxation times λ_E of PAA in water–IPA mixtures, showed stronger scaling compared to salt-free aqueous polyelectrolyte solutions, except for the η_sp in the unentangled regime displaying a polyelectrolyte-like scaling η_sp ~ c^0.5 for all IPA%. Such deviation suggested IPA induces association/aggregation of PAA. However, the trends between η_sp and λ_E magnitudes as a function of IPA% differ for concentrations compared in the entangled regime. The η_sp as well as their elastic moduli exhibit a maximum, whereas λ_E increases monotonically with IPA%, suggesting a complex interplay of various interactions are dictating their structure in water-IPA mixtures, affecting their shear and extensional response differently. Electrospinning experiments showed increasing IPA% reduces the onset of both beaded and uniform fibers. Analysis using dimensionless numbers indicated the enhancement of their elasticity by IPA, and the consequent stabilizing effect on their jets/filaments against break-up during electrospinning, plays a role in the improvement of their fiber formation.

更新日期：2023-04-24

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