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Preparation and properties of polyacrylamide/polyvinyl alcohol physical double network hydrogel

机译：聚丙烯酰胺/聚乙烯醇物理双网络水凝胶的制备与性能

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摘要

A novel physical double network hydrogel (PDN gel) composed of physically cross-linked PVA and hydrophobically associated polyacrylamide (HAPAM) has been successfully prepared by one-pot in situ polymerization and subsequent freeze-thaw cycling. FTIR and XRD analysis showed the presence of two unique mechanisms that contribute to the PDN gels' mechanical properties. Strong hydrogen bonds between PVA and PAM chains and crystallization of PVA were responsible for the enhancement in mechanical strength of PDN gels. The impact of crystallization during freeze-thaw cycling was investigated by comparing freeze-thawed PDN and Semi-IPN HAPAM/PVA hydrogels. The crystallinity and mechanical properties of the PDN hydrogels were also evaluated as a function of the number of cycles and the content of PVA. Moreover, the PDN hydrogels exhibit self-healing capability and good anti-fatigue properties stemming from the physical network of PVA and HAPAM by virtue of the extensive interchain hydrogen bonding between the hydroxyl side groups and the network structure reorganization of hydrophobically associated polyacrylamide. This study thus demonstrates a general approach to improve the mechanical properties and self-healing efficiency of hydrogels by combining the synergistic cross-linking effects provided by hydrophobically associated micelles and crystalline microdomains.
机译：由物理交联的PVA和疏水相关的聚丙烯酰胺（HAPAM）组成的一种新型物理双网络水凝胶（PDN凝胶）通过原位聚合和随后的冻融循环成功地成功地制备了成功制备。 FTIR和XRD分析显示出两个有助于PDN凝胶机械性能的独特机制的存在。 PVA和PAM链之间的强氢键和PVA的结晶负责PDN凝胶的机械强度的增强。通过比较冻结的PDN和半IPN Hapam / PVA水凝胶来研究结晶期间结晶期间的影响。还评估了PDN水凝胶的结晶度和力学性能作为循环次数和PVA含量的函数。此外，PDN水凝胶具有从PVA和HAPAM的物理网络呈现自愈性能力和良好的抗疲劳性能，凭借羟侧基团与疏水相关的聚丙烯酰胺的网络结构重组之间的广泛的间隔键合。因此，该研究表明，通过组合通过疏水相关的胶束和结晶微粒提供的协同交联效应来改善水凝胶的机械性能和自我愈合效率的一般方法。

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  • 来源
    《RSC Advances》 |2016年第113期|共9页
  • 作者

    Zhang Yulin; Song Mingwei; Diao Yongfu; Li Binwei; Shi Linying; Ran Rong;

  • 作者单位

    Sichuan Univ Coll Polymer Sci &

    Engn Chengdu 610065 Peoples R China;

    Sichuan Univ Coll Arts Chengdu 610065 Peoples R China;

    Sichuan Univ Coll Polymer Sci &

    Engn Chengdu 610065 Peoples R China;

    Sichuan Univ Coll Polymer Sci &

    Engn Chengdu 610065 Peoples R China;

    Sichuan Univ Coll Polymer Sci &

    Engn Chengdu 610065 Peoples R China;

    Sichuan Univ Coll Polymer Sci &

    Engn Chengdu 610065 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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