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首页> 外文期刊>RSC Advances >An environmentally friendly preparation and characterization of waterborne polyurethane hydrogels by polyvinyl alcohol physical cross-linking to improve water absorption
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An environmentally friendly preparation and characterization of waterborne polyurethane hydrogels by polyvinyl alcohol physical cross-linking to improve water absorption

机译：通过聚乙烯醇物理交联对水性聚氨酯水凝胶进行环保制备及表征，以提高吸水性

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摘要

In this study, waterborne polyurethane hydrogels were successfully synthesized with a waterborne polyurethane solution (WPU) and poly(vinyl alcohol) (PVA), which acted as a cross-linking agent in a freezing-thawing method. The average diameter of WPU, as determined by dynamic light scattering, was around 41.3 nm. The structure and morphology of the polyurethane composite hydrogel were characterized by means of FTIR, SEM and TGA, which confirmed that WPU and PVA formed a homogeneous miscible system through hydrogen bonds. The FTIR analysis showed that with the increasing WPU content, a large number of hydroxyl groups were provided for hydrogen bonding with the carbonyl group of WPU, resulting in strong hydrogen bonding interactions. From SEM, the number of surface pores of the PU/PVA composite hydrogels increased with increasing WPU content. With the increasing WPU content, the tensile strength of the PU/PVA composite hydrogels decreased. 70% PU/PVA prepared gave the best water absorption of 16.33 g g(-1) in distilled water. The PU/PVA hydrogels had three stages of water absorption, namely, a fast adsorption phase, a slow adsorption phase and an equilibrium adsorption phase. The waterborne polyurethane hydrogel prepared from an environmentally friendly synthetic method was shown to be a promising new candidate as a wound dressing material.
机译：在这项研究中，水性聚氨酯水凝胶被成功地与水性聚氨酯溶液（WPU）和聚（乙烯醇）（PVA），其充当在冻融方法的交联剂来合成。 WPU的平均直径，通过动态光散射所确定的，大约为41.3纳米。通过FTIR，SEM和TGA，这确认了WPU和PVA形成通过氢键均相混溶的系统的装置中的聚氨酯复合水凝胶的结构和形貌进行了表征。的FTIR分析显示，与增加WPU内容，被设置成用于与羰基WPU的，导致强的氢键相互作用的氢键大量羟基。从SEM，表面的数目细孔PU / PVA水凝胶复合随WPU含量增加的。随着越来越WPU内容时，PU / PVA复合水凝胶的拉伸强度降低。 70％的PU / PVA制备得到在蒸馏水16.33克克（-1）最好的水吸收。的PU / PVA水凝胶具有吸水性，即，快速吸附阶段，吸附速度慢相和平衡吸附阶段的三个阶段。从环境友好的合成方法制备的水性聚氨酯水凝胶被证明是有前途的新的候选作为创伤敷料材料。

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  • 来源
    《RSC Advances》 |2015年第90期|共10页
  • 作者

    Wang Cai; Zheng Yudong; Qiao Kun; Xie Yajie; Zhou Xiaoteng;

  • 作者单位

    Univ Sci &

    Technol Beijing Sch Mat Sci &

    Engn Beijing 100083 Peoples R China;

    Univ Sci &

    Technol Beijing Sch Mat Sci &

    Engn Beijing 100083 Peoples R China;

    Univ Sci &

    Technol Beijing Sch Mat Sci &

    Engn Beijing 100083 Peoples R China;

    Univ Sci &

    Technol Beijing Sch Mat Sci &

    Engn Beijing 100083 Peoples R China;

    Univ Sci &

    Technol Beijing Sch Mat Sci &

    Engn Beijing 100083 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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