本研究以构建高强度、高韧性的自修复水凝胶为目标。利用PVA和淀粉分子之间的氢键作为第一物理交联网络,PVA和硼酸分子之间的动态硼酸脂键作为第二化学交联网络,形成一种双交联结构AR/PVA-B水凝胶。AR/PVA-B水凝胶表现出杰出的机械性能...本研究以构建高强度、高韧性的自修复水凝胶为目标。利用PVA和淀粉分子之间的氢键作为第一物理交联网络,PVA和硼酸分子之间的动态硼酸脂键作为第二化学交联网络,形成一种双交联结构AR/PVA-B水凝胶。AR/PVA-B水凝胶表现出杰出的机械性能(断裂伸长率631.2%,最大应力为24.6 k Pa)和优异的自修复性能(无外界刺激的条件下,室温5 min实现94.5%自修复效率)。此外基于自修复性能水凝胶还表现出优秀的重铸性能。本研究为电子皮肤应用中的高强度和快速自修复性能的PVA水凝胶制备提供理论支持与探索。展开更多
本论文以四硼酸钠为交联剂,通过化学交联法和冻融法制备聚乙烯醇(PVA)/海藻酸钠(SA)/聚吡咯(PPy)光热复合水凝胶。采用接触角测量仪、红外热像仪、傅里叶红外光谱仪、力学拉伸机等对复合水凝胶进行测试与表征。结果表明:在PVA中引入SA...本论文以四硼酸钠为交联剂,通过化学交联法和冻融法制备聚乙烯醇(PVA)/海藻酸钠(SA)/聚吡咯(PPy)光热复合水凝胶。采用接触角测量仪、红外热像仪、傅里叶红外光谱仪、力学拉伸机等对复合水凝胶进行测试与表征。结果表明:在PVA中引入SA有助于形成紧密的三维网络互穿结构,力学性能显著提高;PPy的加入提高了复合水凝胶的光热转化效率,同时还具有增加吸水率,进一步改善了力学性能的特点。In this thesis, polyvinyl alcohol (PVA)/sodium alginate (SA)/polypyrrole (PPy) photothermal composite hydrogels were prepared by chemical cross-linking method and freeze-thawing method using sodium tetraborate as cross-linking agent. The composite hydrogels were tested and characterised using contact angle measurement instrument, infrared thermography, Fourier infrared spectroscopy and mechanical stretching machine. The results showed that the incorporation of SA into PVA helped to form a compact three-dimensional network interpenetrating structure and improve the mechanical properties of PVA;the incorporation of PPy increased the efficiency of photothermal conversion, and also increased the water absorption rate, which further improved the mechanical properties.展开更多
文摘本研究以构建高强度、高韧性的自修复水凝胶为目标。利用PVA和淀粉分子之间的氢键作为第一物理交联网络,PVA和硼酸分子之间的动态硼酸脂键作为第二化学交联网络,形成一种双交联结构AR/PVA-B水凝胶。AR/PVA-B水凝胶表现出杰出的机械性能(断裂伸长率631.2%,最大应力为24.6 k Pa)和优异的自修复性能(无外界刺激的条件下,室温5 min实现94.5%自修复效率)。此外基于自修复性能水凝胶还表现出优秀的重铸性能。本研究为电子皮肤应用中的高强度和快速自修复性能的PVA水凝胶制备提供理论支持与探索。
文摘本论文以四硼酸钠为交联剂,通过化学交联法和冻融法制备聚乙烯醇(PVA)/海藻酸钠(SA)/聚吡咯(PPy)光热复合水凝胶。采用接触角测量仪、红外热像仪、傅里叶红外光谱仪、力学拉伸机等对复合水凝胶进行测试与表征。结果表明:在PVA中引入SA有助于形成紧密的三维网络互穿结构,力学性能显著提高;PPy的加入提高了复合水凝胶的光热转化效率,同时还具有增加吸水率,进一步改善了力学性能的特点。In this thesis, polyvinyl alcohol (PVA)/sodium alginate (SA)/polypyrrole (PPy) photothermal composite hydrogels were prepared by chemical cross-linking method and freeze-thawing method using sodium tetraborate as cross-linking agent. The composite hydrogels were tested and characterised using contact angle measurement instrument, infrared thermography, Fourier infrared spectroscopy and mechanical stretching machine. The results showed that the incorporation of SA into PVA helped to form a compact three-dimensional network interpenetrating structure and improve the mechanical properties of PVA;the incorporation of PPy increased the efficiency of photothermal conversion, and also increased the water absorption rate, which further improved the mechanical properties.
