CN113087849A - 一种高强韧导电水凝胶的制备方法 - Google Patents

一种高强韧导电水凝胶的制备方法 Download PDF

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CN113087849A
CN113087849A CN202110487717.3A CN202110487717A CN113087849A CN 113087849 A CN113087849 A CN 113087849A CN 202110487717 A CN202110487717 A CN 202110487717A CN 113087849 A CN113087849 A CN 113087849A
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宋晓峰
韩立彬
任亚君
夏文龙
曲瑞
刘磊
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Changchun University of Technology
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Abstract

本发明涉及一种高强韧导电的水凝胶制备方法，该制备方法以二甲基亚砜(DMSO)/水为溶剂，聚乙烯醇（PVA）为水凝胶基体，4‑(甲基丙烯酰氧基)乙基‑1‑苯酸(MBA)和1,4‑二(5‑己烯氧基)苯(RM26)为交联剂，过硫酸钾(KPS)为引发剂，氯化钠(NaCl)为导电介质，经化学物理反应、溶剂置换、盐浸渍形成高强韧导电PVA基水凝胶。该水凝胶拉伸强度、断点伸长率和电导率分别较纯PVA导电水凝胶提高了2.85倍、1.52倍和1.21倍。

Description

一种高强韧导电水凝胶的制备方法
技术领域
本发明涉及水凝胶领域，特别涉及一种高强韧导电PVA基水凝胶的制备方法。
背景技术
水凝胶是一种通过物理或化学交联形成的三维网络结构的水膨胀体，具有柔韧性、富水性和良好的生物相容性等优点。导电水凝胶可仿生电子皮肤、制成穿戴电子设备以及柔性传感器在在生物医学、组织工程中展现出良好的应用前景，然而水凝胶的较差的机械性能，极大地限制它在这些方面的应用价值。因而，开发强韧的导电水凝胶成为研究的热点。
聚乙烯醇（PVA）有良好的生物相容性和无毒性，广泛应用于工业、农业、医疗等领域。PVA本身可以通过物理交联的方式形成水凝胶，但是较低的强度、韧性，以及高温下凝胶会从固体向液体转变，严重影响了它在可穿戴电子设备、仿生医学工程等方面的应用。
发明内容
为了克服PVA水凝胶存在的技术缺陷，本发明提供了一种高强韧导电PVA基水凝胶的制备方法。本发明选用的交联剂MBA带有刚性侧链和亲水羧基，刚性侧链增强水凝胶的机械性能，亲水羧基与PVA中的羟基形成强氢键增强水凝胶的力学性能，同时还促进了NaCl在水凝胶网络的分散性；选用的辅助交联剂RM26 中既有刚性的苯环又有柔性的碳链；选用的DMSO/水二元溶剂体系，两种溶剂分子间相互作用导致PVA链缺乏溶解而结晶，因此所制备的水凝胶是由PVA链间氢键、PVA和PMBA之间的氢键以及PVA分子链内结晶形成的物理交联网络，从而实现了高强度、高韧性，为离子传输提供稳定的网络通道。
附图说明
图1为水凝胶的断裂强度、断点伸长率和电导率。
具体实施方式
下面通过实施例对本发明进行具体描述。
实施例1：
(1) 在二甲基亚砜-水混合溶剂中加入1.9g的PVA，110℃充分溶解，降温至60℃缓慢滴入0.1g的MBA和0.005RM26充分溶解，加入0.005g的KPS搅拌均匀后，脱气；将液体倒入的模具中，放入60℃鼓风烘箱反应6h，降至室温，于-20℃冷冻24h，室温解冻，用去离子水进行溶液置换，每隔12h换水一次持续一周，除去DMSO；
(2)将步骤(1)中的水凝胶在1mol/L的NaCl水溶液中浸泡12h，在30℃下彻底干燥水凝胶直到质量不再发生变化，用1mol/L NaCl水溶液中再次溶胀，得到的高强韧导电PVA基水凝胶。

Claims (8)

1.一种高强韧导电水凝胶的制备方法，其特征在于：
(1)原料分别为聚乙烯醇（PVA）、4-(甲基丙烯酰氧基)乙基-1-苯酸（MBA）、1,4-二(5-己烯氧基)苯（RM26）和过硫酸钾（KPS）；
(2)在二甲基亚砜(DMSO)/水混合溶剂中加入PVA，110℃充分溶解，降温60℃缓慢滴入MBA和RM26溶解，加入KPS搅拌均匀后脱气，将液体倒入模具中，在60℃反应6h，降至室温，-20℃冷冻24h，室温解冻，用去离子水进行溶液置换，每隔12h换水一次持续一周，除去DMSO；
(3)将上述水凝胶在1mol/L的氯化钠（NaCl）水溶液中浸泡12h后，在30℃干燥至恒重，再一次在1mol/LNaCl水溶液中充分溶胀，制得高强韧导电PVA基水凝胶。
2.根据权利要求书1所述的一种高强韧电水凝胶，其特征在于，PVA为基体，MBA为交联剂，RM26为辅助交联剂，过硫酸钾（KPS）为引发剂。
3.根据权利要求书1所述的MBA的分子结构：
Figure 761719DEST_PATH_IMAGE001
。
4.根据权利要求书1所述的RM26的分子结构：
Figure 331110DEST_PATH_IMAGE002
。
5.根据权利要求书1所述，三种原料及引发剂的投料质量比为95:5:0.25:0.25。
6.根据权利要求书1所述的步骤(2)中，二甲基亚砜和水的质量比为8:2。
7.根据权利要求书1所述的步骤(2)中，原料与溶剂的含量比为1:9。
8.根据权利要求书1所述步骤(3)中，盐溶液不仅限于NaCl水溶液，还可以是硫酸钠、氯化钾、硫酸钾、氯化锂等水溶液。
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BE742298A (zh) * 1968-11-27 1970-05-27
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US20150037540A1 (en) * 2013-07-31 2015-02-05 Kabushiki Kaisha Toshiba Template, a method of processing a template, a method of producing a pattern, and resist
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US20150037540A1 (en) * 2013-07-31 2015-02-05 Kabushiki Kaisha Toshiba Template, a method of processing a template, a method of producing a pattern, and resist
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