Investigation of mechanical properties and internal structure of novel ionic double-nework gels and comparison with conventional hydrogels
Investigation of mechanical properties and internal structure of novel ionic double-nework gels and comparison with conventional hydrogels
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DOI：
10.1007/s00542-015-2630-4
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发表时间：
2016-01-01
影响因子：
2.1
通讯作者：
Furukawa, Hidemitsu
中科院分区：
文献类型：
--
作者：
Ahmed, Kumkum;Watanabe, Yosuke;Furukawa, Hidemitsu
凝胶是一类重要的柔软和湿润材料，具有上级性质，在组织工程、生物医学工程和电化学中具有不同的应用。为了加速凝胶的发展，需要用多种方法和新材料合成具有高机械强度、超低表面摩擦和合适弹性模量的多功能凝胶，并研究其内部结构，以确保最佳实施到任何合适的领域。在众多类型的凝胶中，由离子液体（IL）制成的离子凝胶将可能用于电化学器件中的各种应用，如传感器、致动器、电池和摩擦学领域。离子液体具有许多独特的物理化学性质，使其成为凝胶材料的潜在候选者。本工作利用光聚合法合成了一种以离子液体为基质的离子型双网络凝胶。疏水性单体甲基丙烯酸甲酯用作第一网络，疏水性IL单体N，N-二乙基-N-（2-甲基丙烯酰基乙基）-N-甲基铵双（三氟甲基磺酰基）酰亚胺用作第二网络。所得iDN凝胶显示出透明性、柔性和良好的机械韧性。首次尝试确定iDN凝胶的筛目尺寸，以通过扫描显微镜光散射来理解基于离子液体的凝胶的内部结构。从内部结构尺寸、溶剂含量和杨氏模量三个方面确定了iDN凝胶的三种交联密度。通过比较三种网格密度，讨论了凝胶的网络结构与力学性能的关系。通过比较iDN凝胶和常规水凝胶的交联密度，了解iDN凝胶的网络结构，并讨论其与水凝胶的结构行为的差异。
Gels are an important class of soft and wet materials having superior properties with diverse applications in tissue engineering, bio-medical engineering, and electrochemistry. In order to accelerate the development of gels, it is required to synthesize multi-functional gels of high mechanical strength, ultra low surface friction and suitable elastic modulus with a variety of methods and new materials and investigate their internal structure to ensure the best implementation to any suitable fields. Among many types of gels, ionic gels made from ionic liquids (ILs) will be possibly used for diverse applications in electrochemical devices as sensors, actuators, batteries and in the field of tribology. ILs are characterized by many unique physico-chemical properties which make them a potential candidate for gel materials. In the present work a novel approach for preparing Ionic double-network gels (iDN gels) using IL have been synthesized utilizing photo-polymerization process. A hydrophobic monomer methyl methacrylate has been used as a first network and a hydrophobic IL monomer, N,N-diethyl-N-(2-mthacryloylethyl)-N-methylammonium bistrifluoromethylsulfonyl)imide has been used as a second network. The resulting iDN gels show transparency, flexibility and good mechanical toughness. An attempt to determine the mesh size of the iDN gels has been made for the first time to understand the internal structure of the ionic liquid based gels by scanning microscopic, light scattering. Three types of crosslinking densities of the iDN gels were experimentally determined from the size of internal structure, solvent content and Young's modulus. By comparing the three mesh densities, the relation between the network structure and mechanical properties of the gels is discussed. We compared the crosslinking densities of the iDN gels and conventional hydrogels to understand the network structure of the iDN gels and discussed its difference of structural behavior from that of hydrogels.