CN105778123A - 一种琼脂氧化石墨烯双网络水凝胶及其制备方法 - Google Patents

一种琼脂氧化石墨烯双网络水凝胶及其制备方法 Download PDF

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CN105778123A
CN105778123A CN201610146025.1A CN201610146025A CN105778123A CN 105778123 A CN105778123 A CN 105778123A CN 201610146025 A CN201610146025 A CN 201610146025A CN 105778123 A CN105778123 A CN 105778123A
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王朝阳
朱胖
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South China University of Technology SCUT
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Abstract

本发明属于智能高分子材料技术领域,公开了一种琼脂氧化石墨烯双网络水凝胶及其制备方法。所述制备方法为:将氧化石墨烯粉末超声分散于去离子水中,得到氧化石墨烯分散液,然后加入水凝胶单体,冰浴下搅拌分散均匀,然后通氮气除氧后加入琼脂,在85~95℃温度下加热搅拌使琼脂溶解;冷却至室温,加入引发剂,震荡后将其注入到模具中,然后放入烘箱在40~60℃温度下反应24~48小时,得到所述琼脂氧化石墨烯双网络水凝胶。该水凝胶具有较高的拉伸强度及断裂伸长率,良好的抗疲劳性能和自愈合能力,可以用于组织工程以及人工智能器件。

Description

一种琼脂氧化石墨烯双网络水凝胶及其制备方法
技术领域
本发明属于智能高分子材料技术领域,具体涉及一种琼脂氧化石墨烯双网络水凝胶及其制备方法。
背景技术
水凝胶是一种包含大量水的三维高分子聚合物网络,具有类生物组织结构,因此在控制释药、组织工程、伤口敷料等方面具有重要应用前景,并且可以对多种外界刺激发生响应行为,从而在传感器方面发挥作用。但是传统水凝胶由于其内部组织结构含有大量水和缺陷区域,导致强度低、拉伸倍数低,抗疲劳性能差等多点,严重限制了水凝胶的实际应用。针对水凝胶力学强度的研究吸引了众多研究者的兴趣,多种新型水凝胶概念被提出,如纳米复合物水凝胶,滑环水凝胶,四臂水凝胶以及双网络水凝胶等等。其中双网络水凝胶由龚建平及其合作者提出并首次制备,具有优异的力学性能,推进了水凝胶的研究进展,但是仍然存在诸多问题。首先,传统双网络水凝胶一般采用两步法制备,其中涉及第一网络的合成,干燥,重新溶胀引进第二网络单体,二次聚合等步骤,制备过程复杂,耗费时间较长;其二,传统双网络水凝胶采用溶胀法引进第二网络的单体,不仅需要过量的第二单体,造成原料的浪费,而且因为溶胀过程无法精确控制,导致凝胶的性能难以重复;其三,传统双网络水凝胶制备方法决定其只能制备出诸如棒状、板状等简单形状的水凝胶,无法满足实际应用的需要;其四,传统双网络水凝胶一般采用化学交联,拉伸回复性能差,不具有自愈合性能。因此需要探索更为简单便捷的制备方法以及可逆的交联方式。
发明内容
为了解决以上现有技术的缺点和不足之处,本发明的首要目的在于提供一种琼脂氧化石墨烯双网络水凝胶。
本发明的另一目的在于一种上述琼脂氧化石墨烯双网络水凝胶的制备方法。
本发明目的通过以下技术方案实现:
一种琼脂氧化石墨烯双网络水凝胶,所述双网络水凝胶以天然高分子琼脂作为第一网络,以氧化石墨烯交联的高分子作为第二网络。
上述琼脂氧化石墨烯双网络水凝胶的制备方法,包括如下制备步骤:
(1)将氧化石墨烯粉末超声分散于去离子水中,得到氧化石墨烯分散液,然后加入水凝胶单体,冰浴下搅拌分散均匀,然后通氮气除氧;
(2)向步骤(1)得到的分散液中加入琼脂,在85~95℃温度下加热搅拌使琼脂溶解;
(3)将步骤(2)得到的分散液冷却至室温,加入引发剂,震荡后将其注入到模具中,然后放入烘箱在40~60℃温度下反应24~48小时,得到所述琼脂氧化石墨烯双网络水凝胶。
优选地,步骤(1)中所述氧化石墨烯分散液的浓度为1~4mg/mL。
步骤(1)中所述的水凝胶单体是指一类水溶性的单体,其通过原位聚合法可得到水凝胶;所述水凝胶单体优选为丙烯酰胺、丙烯酸、异丙基丙烯酰胺等中的一种。
优选地,所述水凝胶单体加入的质量百分含量为15%~25%。
优选地,所述琼脂的加入量为10~40mg/mL。
优选地,所述引发剂为过硫酸铵或过硫酸钾;引发剂的加入量为水凝胶单体质量的0.4%。
步骤(3)所述的模具形状可以根据应用和测试需求来决定,可以将凝胶前体溶液注入到各种形状的模具中,从而制备出各种形状的双网络水凝胶。
本发明的制备方法及所得到的产物具有如下优点及有益效果:
(1)本发明采用了一步法制备双网络水凝胶,相较于传统双网络水凝胶,无需经过第一网络干燥、再次溶胀等过程,制备方法简单,耗费时间短;
(2)本发明采用一步法,投料量精确可控,易于调整配方,能够根据需要制备性能不同的双网络水凝胶,并且可重复性强,不会浪费原料;
(3)本发明采用一步制备双网络水凝胶,不需要依靠第一网络具有高溶胀能力以引入第二网络单体,所以极大扩展了可以选用作为凝胶原料的单体种类;
(4)本发明采用双物理交联网络,琼脂依靠自身分子链之间的氢键形成第一网络,而氧化石墨烯则作为高分子聚合物的交联剂形成第二网络,这种双网络交联方式赋予水凝胶良好的抗疲劳性以及自愈合能力;
(5)本发明采用氧化石墨烯作为第二网络的交联剂,氧化石墨烯经过还原以后,可以赋予水凝胶良好的传热能力以及一定的导电性。
附图说明
图1为本发明所得琼脂氧化石墨烯双网络水凝胶的柔韧性测试效果图。
图2为本发明所得琼脂氧化石墨烯双网络水凝胶拉伸及自愈合性能测试曲线图。
具体实施方式
下面结合实施例对本发明作进一步详细的描述,但本发明的实施方式不限于此。
实施例1
(1)将氧化石墨烯粉末超声分散于去离子水中,得到浓度为1mg/mL的氧化石墨烯分散液,取上述氧化石墨烯分散液19.4mL,向其中加入丙烯酰胺单体3g,冰浴下磁力搅拌2h分散均匀,然后通氮气30min除氧;
(2)向步骤(1)得到的分散液中加入琼脂200mg搅拌5min,然后在90℃温度下加热搅拌15min使琼脂完全溶解;
(3)将步骤(2)得到的分散液冷却至室温,加入20mg/mL的过硫酸钾溶液0.6mL,快速振荡10s后将所得凝胶前体溶液注入到玻璃模具中,玻璃模具由两块100*100*3mm的玻璃板以及一块中间挖空的2mm厚的硅胶板组成。将玻璃模具密封后,放入45℃烘箱中反应24h,得到所述琼脂氧化石墨烯双网络水凝胶。
实施例2
(1)将氧化石墨烯粉末超声分散于去离子水中,得到浓度为1mg/mL的氧化石墨烯分散液,取上述氧化石墨烯分散液19mL,向其中加入丙烯酰胺单体5g,冰浴下磁力搅拌1h分散均匀,然后通氮气30min除氧;
(2)向步骤(1)得到的分散液中加入琼脂600mg搅拌5min,然后在85℃温度下加热搅拌20min使琼脂完全溶解;
(3)将步骤(2)得到的分散液冷却至室温,加入20mg/mL的过硫酸钾溶液1.0mL,快速振荡10s后将所得凝胶前体溶液注入到玻璃模具中,玻璃模具由两块100*100*3mm的玻璃板以及一块中间挖空的2mm厚的硅胶板组成。将玻璃模具密封后,放入40℃烘箱中反应48h,得到所述琼脂氧化石墨烯双网络水凝胶。
实施例3
(1)将氧化石墨烯粉末超声分散于去离子水中,得到浓度为2mg/mL的氧化石墨烯分散液,取上述氧化石墨烯分散液19.2mL,向其中加入异丙基丙烯酰胺单体4g,冰浴下磁力搅拌3h分散均匀,然后通氮气30min除氧;
(2)向步骤(1)得到的分散液中加入琼脂200mg搅拌5min,然后在95℃温度下加热搅拌10min使琼脂完全溶解;
(3)将步骤(2)得到的分散液冷却至室温,加入20mg/mL的过硫酸钾溶液0.8mL,快速振荡10s后将所得凝胶前体溶液注入到玻璃模具中,玻璃模具由两块100*100*3mm的玻璃板以及一块中间挖空的2mm厚的硅胶板组成。将玻璃模具密封后,放入60℃烘箱中反应24h,得到所述琼脂氧化石墨烯双网络水凝胶。
实施例4
(1)将氧化石墨烯粉末超声分散于去离子水中,得到浓度为3mg/mL的氧化石墨烯分散液,取上述氧化石墨烯分散液19.2mL,向其中加入丙烯酰胺单体4g,冰浴下磁力搅拌2h分散均匀,然后通氮气30min除氧;
(2)向步骤(1)得到的分散液中加入琼脂400mg搅拌5min,然后在90℃温度下加热搅拌15min使琼脂完全溶解;
(3)将步骤(2)得到的分散液冷却至室温,加入20mg/mL的过硫酸铵溶液0.8mL,快速振荡10s后将所得凝胶前体溶液注入到玻璃模具中,玻璃模具由两块100*100*3mm的玻璃板以及一块中间挖空的2mm厚的硅胶板组成。将玻璃模具密封后,放入45℃烘箱中反应24h,得到所述琼脂氧化石墨烯双网络水凝胶。
实施例5
(1)将氧化石墨烯粉末超声分散于去离子水中,得到浓度为4mg/mL的氧化石墨烯分散液,取上述氧化石墨烯分散液19.4mL,向其中加入丙烯酰胺单体3g,冰浴下磁力搅拌2h分散均匀,然后通氮气30min除氧;
(2)向步骤(1)得到的分散液中加入琼脂400mg搅拌5min,然后在90℃温度下加热搅拌15min使琼脂完全溶解;
(3)将步骤(2)得到的分散液冷却至室温,加入20mg/mL的过硫酸钾溶液0.6mL,快速振荡10s后将所得凝胶前体溶液注入到三角形模具中。将模具密封后,放入45℃烘箱中反应24h,得到所述琼脂氧化石墨烯双网络水凝胶。
实施例6
(1)将氧化石墨烯粉末超声分散于去离子水中,得到浓度为2mg/mL的氧化石墨烯分散液,取上述氧化石墨烯分散液19mL,向其中加入丙烯酰胺单体5g,冰浴下磁力搅拌2h分散均匀,然后通氮气30min除氧;
(2)向步骤(1)得到的分散液中加入琼脂400mg搅拌5min,然后在90℃温度下加热搅拌15min使琼脂完全溶解;
(3)将步骤(2)得到的分散液冷却至室温,加入20mg/mL的过硫酸铵溶液1.0mL,快速振荡10s后将所得凝胶前体溶液注入到球形模具中。将模具密封后,放入45℃烘箱中反应24h,得到所述琼脂氧化石墨烯双网络水凝胶。
本发明所得琼脂氧化石墨烯双网络水凝胶的柔韧性测试效果图如图1所示;其拉伸及自愈合性能测试曲线图如图2所示。由图1和图2可以看出,本发明所得琼脂氧化石墨烯双网络水凝胶具有较高的拉伸强度及断裂伸长率,良好的抗疲劳性能和自愈合能力。
上述实施例为本发明较佳的实施方式,但本发明的实施方式并不受上述实施例的限制,其它的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化,均应为等效的置换方式,都包含在本发明的保护范围之内。

Claims (7)

1.一种琼脂氧化石墨烯双网络水凝胶,其特征在于:所述双网络水凝胶以天然高分子琼脂作为第一网络,以氧化石墨烯交联的高分子作为第二网络。
2.权利要求1所述的一种琼脂氧化石墨烯双网络水凝胶的制备方法,其特征在于包括如下制备步骤:
(1)将氧化石墨烯粉末超声分散于去离子水中,得到氧化石墨烯分散液,然后加入水凝胶单体,冰浴下搅拌分散均匀,然后通氮气除氧;
(2)向步骤(1)得到的分散液中加入琼脂,在85~95℃温度下加热搅拌使琼脂溶解;
(3)将步骤(2)得到的分散液冷却至室温,加入引发剂,震荡后将其注入到模具中,然后放入烘箱在40~60℃温度下反应24~48小时,得到所述琼脂氧化石墨烯双网络水凝胶。
3.根据权利要求2所述的一种琼脂氧化石墨烯双网络水凝胶的制备方法,其特征在于:步骤(1)中所述氧化石墨烯分散液的浓度为1~4mg/mL。
4.根据权利要求2所述的一种琼脂氧化石墨烯双网络水凝胶的制备方法,其特征在于:步骤(1)中所述的水凝胶单体是指丙烯酰胺、丙烯酸或异丙基丙烯酰胺。
5.根据权利要求2所述的一种琼脂氧化石墨烯双网络水凝胶的制备方法,其特征在于:所述水凝胶单体加入的质量百分含量为15%~25%。
6.根据权利要求2所述的一种琼脂氧化石墨烯双网络水凝胶的制备方法,其特征在于:所述琼脂的加入量为10~40mg/mL。
7.根据权利要求2所述的一种琼脂氧化石墨烯双网络水凝胶的制备方法,其特征在于:所述引发剂为过硫酸铵或过硫酸钾;引发剂的加入量为水凝胶单体质量的0.4%。
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