Formation Mechanism Analysis of Shear‐Induced Microgel Filaments during Microfluidic Gelation,Macromolecular Materials and Engineering

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Formation Mechanism Analysis of Shear‐Induced Microgel Filaments during Microfluidic Gelation
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2020-12-16 , DOI: 10.1002/mame.202000586
Shuhei Fukushima ₁ , Yuriko Takayama ₁ , Eri Nasuno ₁ , Yasuko Yanagida ₂ , Norihiro Kato ₁

Affiliation

Dynamic microfluidic gelation enables the fabrication of bundle‐structured multiple parallel microgel filaments from an aqueous two‐phase system. The formation mechanism of shear‐induced filaments from an alginate (Alg)/polyvinyl alcohol (PVA) blend is studied using red‐colored PVA and a titanium alkoxide PVA crosslinker. Bundle‐structured Alg microgel filaments are formed through contact with a Ca²⁺ crosslinker. In this process, the PVA acts as a sacrificial polymer to maintain the Alg gel filaments because approximately 90% of the red‐colored PVA is released from the Ca²⁺‐crosslinked Alg gel filaments into the wash water. In addition, the fabrication of PVA gel filaments shows that the sacrificial PVA is also transformed into fibrillar domains under shear. However, the filament structure cannot be formed from a single‐phase PVA/Alg solution. These results clearly show that the bundle‐structured gel filaments are maintained by preventing the fusion of filaments during gelation based on the tendency of the non‐crosslinked filaments to cause splitting of the gelled filaments.

中文翻译：

微流凝胶化过程中剪切诱导的微凝胶丝形成机理分析

动态微流凝胶能够从水相两相系统制造成束结构的多根平行微凝胶丝。使用红色PVA和钛醇盐PVA交联剂研究了藻酸盐（Alg）/聚乙烯醇（PVA）混合物中剪切诱导长丝的形成机理。束状Alg微凝胶丝是通过与Ca ²⁺交联剂接触而形成的。在此过程中，PVA作为牺牲聚合物来维持Alg凝胶丝，因为大约90％的红色PVA从Ca ^2+中释放出来。将Alg凝胶丝交联到洗涤水中。此外，PVA凝胶丝的制造表明，在剪切作用下，牺牲性PVA也被转化为纤维状结构域。但是，灯丝结构不能由单相PVA / Alg溶液形成。这些结果清楚地表明，基于非交联细丝引起胶凝细丝分裂的趋势，可以通过防止胶凝过程中细丝融合来保持束状凝胶细丝。

更新日期：2021-02-15

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