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Hybrid granular hydrogels: combining composites and microgels for extended ranges of material properties.
Soft Matter ( IF 2.9 ) Pub Date : 2020-03-28 , DOI: 10.1039/d0sm00213e Céline Samira Wyss 1 , Peyman Karami 2 , Pierre-Etienne Bourban 1 , Dominique P Pioletti 2
Soft Matter ( IF 2.9 ) Pub Date : 2020-03-28 , DOI: 10.1039/d0sm00213e Céline Samira Wyss 1 , Peyman Karami 2 , Pierre-Etienne Bourban 1 , Dominique P Pioletti 2
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Developing hydrogels with optimal properties for specific applications is challenging as most of these properties, such as toughness, stiffness, swelling or deformability, are interrelated. The improvement of one property usually comes at the cost of another. In order to decouple the interdependence between these properties and to extend the range of material properties for hydrogels, we propose a strategy that combines composite and microgel approaches. The study focuses first on tailoring the swelling performance of hydrogels while minimally affecting other properties. The underlying principle is to partially substitute some of the hydrogels with pre-swollen microgels composed of the same materials. Swelling reductions up to 45% were obtained. Those granular hydrogels were then reinforced with nano-fibrillated cellulose fibres obtaining hybrid granular materials to improve their toughness and to further reduce their initial swelling. Four different structures of neat, granular and composite hydrogels including 63 different hydrogel compositions based on 20 kDa poly(ethylene glycol)dimethacrylate showed that the swelling ratio could be tailored without significantly affecting elastic modulus and deformation performance. The results explain the role of the PEGDM precursors on the swelling of the microgels as well as the influence of the microgel and fibre contents on the final properties. Moreover, the precursors of hydrogels with similar mechanical or swelling performance were injectable with a wide range of complex viscosities from 0.1 Pa s to over 1000 Pa s offering new opportunities for applications in confined as well as in unconfined environments.
中文翻译：
混合颗粒水凝胶：将复合材料和微凝胶结合使用，可扩展材料性能范围。
开发具有针对特定应用的最佳性能的水凝胶是具有挑战性的，因为这些性能中的大多数（例如韧性，刚度，溶胀或可变形性）是相互关联的。一种财产的改善通常是以另一种财产为代价的。为了消除这些特性之间的相互依赖关系并扩展水凝胶的材料特性范围，我们提出了一种将复合材料和微凝胶方法相结合的策略。该研究首先关注于调整水凝胶的膨胀性能，同时将对其他性能的影响降到最低。基本原理是用相同材料组成的预溶胀微凝胶部分替代某些水凝胶。溶胀减少高达45％。然后用纳米原纤化纤维素纤维增强那些颗粒状水凝胶，从而获得混合颗粒状材料，以提高其韧性并进一步减少其初始溶胀。包含63种基于20 kDa聚（乙二醇）二甲基丙烯酸酯的不同水凝胶组合物的纯净，颗粒状和复合水凝胶的四种不同结构表明，可以调整溶胀率，而不会显着影响弹性模量和变形性能。结果解释了PEGDM前体对微凝胶溶胀的作用，以及微凝胶和纤维含量对最终性能的影响。而且，具有相似机械或溶胀性能的水凝胶前体可以以从0开始的宽复数粘度注射。
更新日期：2020-04-24
中文翻译：
混合颗粒水凝胶：将复合材料和微凝胶结合使用，可扩展材料性能范围。
开发具有针对特定应用的最佳性能的水凝胶是具有挑战性的，因为这些性能中的大多数（例如韧性，刚度，溶胀或可变形性）是相互关联的。一种财产的改善通常是以另一种财产为代价的。为了消除这些特性之间的相互依赖关系并扩展水凝胶的材料特性范围，我们提出了一种将复合材料和微凝胶方法相结合的策略。该研究首先关注于调整水凝胶的膨胀性能，同时将对其他性能的影响降到最低。基本原理是用相同材料组成的预溶胀微凝胶部分替代某些水凝胶。溶胀减少高达45％。然后用纳米原纤化纤维素纤维增强那些颗粒状水凝胶，从而获得混合颗粒状材料，以提高其韧性并进一步减少其初始溶胀。包含63种基于20 kDa聚（乙二醇）二甲基丙烯酸酯的不同水凝胶组合物的纯净，颗粒状和复合水凝胶的四种不同结构表明，可以调整溶胀率，而不会显着影响弹性模量和变形性能。结果解释了PEGDM前体对微凝胶溶胀的作用，以及微凝胶和纤维含量对最终性能的影响。而且，具有相似机械或溶胀性能的水凝胶前体可以以从0开始的宽复数粘度注射。
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