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首页> 外文期刊>Journal of Applied Polymer Science >High strength and toughness of double physically cross-linked hydrogels composed of polyvinyl alcohol and calcium alginate
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High strength and toughness of double physically cross-linked hydrogels composed of polyvinyl alcohol and calcium alginate

机译：由聚乙烯醇和藻酸钙组成的双物理交联水凝胶的高强度和韧性

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摘要

The weak mechanical properties of hydrogels, especially physically cross-linked hydrogels are usually a major factor to hinder their application. To solve this problem, in this work, we prepared a high strength and toughness of double physically cross-linked (PDN) hydrogels composed of crystalline domain cross-linked polyvinyl alcohol (PVA) and Ca2+-cross-linked alginate (Alg). With a further annealing treatment, the noncovalent cross-linked network via the formed crystalline promote the as-prepared PDN PVA/Alg hydrogel to exhibit well mechanical properties with the tensile strength of similar to 1.94 MPa, elongation at break of similar to 607% and Young's modulus of similar to 0.45 MPa (above 70 wt% of water content). By analyzing the mechanism of improving the hydrogel mechanical properties, it is found that annealing can effectively improve the crystallinity of PVA in the hydrogel, and then greatly improve the mechanical properties of the hydrogel. This provides a general method for improving the mechanical properties of PVA PDN hydrogels. In addition, the PDN PVA/Alg hydrogel was also proved to have good ionic conductivity of 1.70 S m(-1). These desirable properties make the prepared physically cross-linked hydrogels promising materials for medical and biosensing fields.
机译：水凝胶，尤其是物理交联水凝胶的弱机械性能通常是阻碍其应用的主要因素。为了解决这一问题，在本研究中，我们制备了一种由晶域交联聚乙烯醇（PVA）和钙交联海藻酸盐（Alg）组成的高强度和高韧性的双物理交联（PDN）水凝胶。通过进一步退火处理，通过形成的晶体形成的非共价交联网络促进制备的PDN PVA/Alg水凝胶表现出良好的机械性能，拉伸强度接近1.94 MPa，断裂伸长率接近607%，杨氏模量接近0.45 MPa（水含量高于70 wt%）。通过分析提高水凝胶力学性能的机理，发现退火可以有效提高水凝胶中PVA的结晶度，从而大大提高水凝胶的力学性能。这为提高PVA-PDN水凝胶的力学性能提供了一种通用方法。此外，PDN-PVA/Alg水凝胶也被证明具有1.70μm（-1）的良好离子导电性。这些理想的性质使得所制备的物理交联水凝胶有望成为医疗和生物传感领域的材料。

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