CN111300961A - 一种褶皱型可拉伸驻极体的制备方法 - Google Patents
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Abstract
本发明公开了一种褶皱型可拉伸驻极体的制备方法,具体步骤为:对弹性聚合物进行拉伸处理,然后将进行过极化处理的聚合物带电薄膜粘附在处于拉伸状态下的弹性聚合物表面上,再将另一块同样处于拉伸状态的弹性聚合物基体粘附在聚合物薄膜表面。最后放松所施加的拉力,弹性聚合物基体收缩,中间的带电聚合物薄膜由于弹性聚合物的挤压形成褶皱结构。本发明获得的褶皱型驻极体在受到外界拉力时,中间的褶皱结构会铺平,从而展示出优异的可拉伸性能。该材料制备方法简单,易于大规模生产,可用于柔性传感器、人工皮肤、能量俘获等领域。
Description
技术领域
本发明属于功能材料领域,主要涉及提出一种褶皱型可拉伸驻极体的制备方法。
背景技术
近年来,随着柔性电子、个性化医疗等领域的蓬勃发展,越来越呼唤着新一代柔性换能材料更好地实现传感、俘能、人工皮肤等核心功能。驻极体材料是学界广为关注的一个候选者,它指的是一类携带永久电荷的电介质材料,多为聚合物软材料,例如四氟乙烯PTFE、聚丙烯PP、聚乙烯PE、聚对苯二甲酸PET、氟化乙丙烯共聚物FEP等等。由于其既具有优异的力电耦合性能,又具有柔韧性的特点,已被初步应用于上述领域,并显示出了优异的性能。但是,广泛使用的驻极体材料虽然具有一定的柔韧性,但是并不具备可拉伸性,这在一定程度上限制了驻极体材料在人工皮肤、柔性传感器、能量俘获等领域的进一步应用。
发明内容
为了克服上述现有技术存在的问题,本发明在于提供一种褶皱型可拉伸驻极体的制备方法,用该方法可以使得驻极体材料具有较好的可拉伸性能。
为了达到上述目的,本发明采用如下技术方案:
一种褶皱型可拉伸驻极体的制备方法,采用下述任一种方法制备得到,
(A)对弹性聚合物基体1进行拉伸处理,然后将进行过极化处理的聚合物薄膜2粘附在处于拉伸状态下的弹性聚合物1表面上,再将另一块处于拉伸状态的弹性聚合物基体1粘附在聚合物薄膜2表面;最后放松所施加的拉力,弹性聚合物基体1收缩,中间的带电聚合物薄膜2由于弹性聚合物基体1的挤压形成褶皱结构;
(B)对弹性聚合物基体1进行拉伸处理,然后将聚合物薄膜2粘附在处于拉伸状态下的弹性聚合物基体1表面上,对其进行极化处理,再将另一块处于拉伸状态的弹性聚合物基体1粘附在聚合物薄膜2表面;最后放松所施加的拉力,弹性聚合物基体1收缩,中间的带电聚合物薄膜2由于弹性聚合物基体1的挤压形成褶皱结构;
由于褶皱结构结构的存在,使得驻极体可拉伸。
所述拉伸处理是单轴拉伸或多轴拉伸。
所述聚合物薄膜2的厚度比弹性聚合物基体1小至少一个数量级。
所述聚合物薄膜2的杨氏模量比弹性聚合物基体1大至少一个数量级。
通过改变弹性聚合物基体1的拉伸倍数、两层弹性聚合物基体1的拉伸比例、弹性聚合物基体1和聚合物薄膜2的杨氏模量比来调控最终的驻极体的可拉伸性能。
所述聚合物薄膜2为密实薄膜或者带有孔洞的薄膜,当薄膜为密实结构时,所得驻极体为单极性驻极体,当薄膜为孔洞结构时,所得驻极体为双极性驻极体。
所述聚合物薄膜2材料采用四氟乙烯PTFE、聚偏二氟乙烯PVDF、聚丙烯PP、聚乙烯PE、聚对苯二甲酸PET、聚萘二甲酸乙二醇酯PEN、氟化乙丙烯共聚物FEP或环烯烃共聚物。
所述弹性聚合物基体1的材料为硅橡胶材料,例如聚二甲基硅氧烷PDMS或铂催化硅橡胶ECOFLEX及其它种类的硅橡胶材料。
所述粘附的方法是基于弹性聚合物基体1本身的粘性直接粘接成型,或者使用粘接剂粘接。
所述极化处理采用电晕极化法。
所述极化处理采用电晕极化法。
本发明具有以下优点:
1、与现有驻极体功能膜相比,本发明获得的褶皱型驻极体具有可拉伸的特性。
2、本发明制备方法简单易行。
3、利用本发明制备的褶皱型可拉伸驻极体薄膜可用于能量俘获、人工皮肤、柔性传感器等领域。
附图说明
图1为制备流程图(实施例1)。
图2为制备流程图(实施例2)。
图3为制备流程图(实施例3)。
图4为中间薄膜为密实结构时,获得的单极性褶皱型驻极体的可拉伸性能的演示图。
图5为中间薄膜为孔洞结构时,获得的双极性褶皱型驻极体的可拉伸性能的演示图。
具体实施方式
下面将结合附图及具体实例来详细说明本发明,但并不作为对本发明的限定。
实施例1:依据以下步骤可以获得褶皱型可拉伸驻极体。
1.如图1中第①步所示,首先将市售的0.5mm厚的3M公司VHB透明强力胶带剪成长度为5cm、宽度为3cm的两片长方形胶带。如图1中第②步所示,使用拉伸机分别将这两片VHB透明强力胶带沿长度方向单向拉伸2倍至10cm,保持这个拉伸长度;
2.选取厚度为10μm的聚四氟乙烯(PTFE)薄膜,将其剪成长度为4cm宽度为2cm的长方形薄膜,使用电晕极化法对其进行带电处理,使其携带表面负电荷。电晕充电电压控制为-10kV,电极与膜的距离为7cm,充电温度为常温,充电时间分别为1min。
3.如图1中第③步所示,将电极化处理过的PTFE薄膜粘附在处于拉伸状态下的其中一片VHB透明强力胶带表面,再将另一块处于拉伸状态的VHB透明强力胶带粘附在PTFE薄膜表面,以形成一个处在拉伸状态下的VHB-PTFE-VHB三明治结构,按压此三明治结构以挤掉其中的空气气泡。
4.如图1中第④步所示,放松拉力机所施加的拉力,VHB透明强力胶带收缩,中间的PTFE薄膜由于弹性聚合物基体的挤压形成褶皱结构。
实施例2:依据以下步骤可以获得褶皱型可拉伸驻极体。
1.如图2中第①步所示,首先将市售的0.5mm厚的3M公司VHB透明强力胶带剪成长度为5cm、宽度为3cm的两片长方形胶带。如图2中第②步所示,使用拉伸机分别将这两片VHB透明强力胶带沿长度方向单向拉伸2倍至10cm,保持这个拉伸长度;
2.选取厚度为10μm的聚四氟乙烯(PTFE)薄膜,将其剪成长度为4cm宽度为2cm的长方形薄膜。如图2中第③步所示,将其粘附在处于拉伸状态下的其中一片VHB透明强力胶带表面,使用电晕极化法对其进行带电处理,使其携带表面负电荷。电晕充电电压控制为-10kV,电极与膜的距离为7cm,充电温度为常温,充电时间分别为1min。
3.再将另一块处于拉伸状态的VHB胶带粘附在PTFE薄膜表面,以形成一个处在拉伸状态下的VHB-PTFE-VHB三明治结构,按压此三明治结构以挤掉其中的空气气泡。
4.如图2中第④步所示,放松拉力机所施加的拉力,VHB收缩,中间的PTFE薄膜由于弹性聚合物基体的挤压形成褶皱结构。
实施例3:依据以下步骤可以获得褶皱型可拉伸驻极体。
1.如图3中第①步所示,首先将市售的0.5mm厚的3M公司VHB透明强力胶带剪成长度为5cm、宽度为3cm的两片长方形胶带。如图3中第②步所示,使用拉伸机分别将这两片胶带沿长度方向单向拉伸2倍至10cm,保持这个拉伸长度;
2.选取市售厚度为50μm的聚丙烯(PP)薄膜,将其剪成长度为4cm宽度为2cm的长方形薄膜,使用电晕极化法对其进行带电处理,使其携带表面负电荷。电晕充电电压控制为-10kV,电极与膜的距离为7cm,充电温度为常温,充电时间分别为1min。
3.如图3中第③步所示,将电极化处理过的PP薄膜粘附在处于拉伸状态下的其中一片VHB透明强力胶带表面,再将另一块处于拉伸状态的VHB透明强力胶带粘附在PP薄膜表面,以形成一个处在拉伸状态下的VHB-PP-VHB三明治结构,按压此三明治结构以挤掉其中的空气气泡。
4.如图3中第④步所示,放松拉力机所施加的拉力,VHB透明强力胶带收缩,中间的PP薄膜由于弹性聚合物基体的挤压形成褶皱结构。
图4展示了当中间薄膜为密实结构时,获得的单极性褶皱型驻极体的可拉伸性。图5展示了当中间薄膜为孔洞结构时,获得的双极性褶皱型驻极体的可拉伸性。虽然中间的带电聚合物薄膜2杨氏模量较大,常规条件下不容易产生拉伸变形,如同当前的其它驻极体材料一样。但是从图4和图5可以看出,对于褶皱型驻极体,在受到外界拉力时,特定的褶皱结构使得拉力对聚合物薄膜2的效果主要为弯曲变形而不是拉伸变形,可以理解的是,弯曲一张聚合物薄膜要比拉伸它容易许多。这也就是本发明褶皱型驻极体具备可拉伸性的关键原因。不过,当外部拉力增大到一定程度,使得褶皱结构铺平,那么聚合物薄膜2不再有弯曲的空间,拉力对聚合物薄膜2的效果变为拉伸变形,这个时候对应的伸长率即为此驻极体的拉伸极限。由此可见,在制备过程中,对于弹性聚合物基体1的拉伸倍数决定了最后褶皱型驻极体的可拉伸限度。同样地,两层弹性聚合物基体1的拉伸比例、弹性聚合物基体1和聚合物薄膜2的杨氏模量比,这两个因素也可以影响褶皱型驻极体的拉伸性能。对于这些参数的简单改变都应涵盖在本发明的保护范围之内。
Claims (10)
1.一种褶皱型可拉伸驻极体的制备方法,其特征在于:采用下述任一种方法制备得到,
(A)对弹性聚合物基体(1)进行拉伸处理,然后将进行过极化处理的聚合物薄膜(2)粘附在处于拉伸状态下的弹性聚合物(1)表面上,再将另一块处于拉伸状态的弹性聚合物基体(1)粘附在聚合物薄膜(2)表面;最后放松所施加的拉力,弹性聚合物基体(1)收缩,中间的带电聚合物薄膜(2)由于弹性聚合物基体(1)的挤压形成褶皱结构;
(B)对弹性聚合物基体(1)进行拉伸处理,然后将聚合物薄膜(2)粘附在处于拉伸状态下的弹性聚合物基体(1)表面上,对其进行极化处理,再将另一块处于拉伸状态的弹性聚合物基体(1)粘附在聚合物薄膜(2)表面;最后放松所施加的拉力,弹性聚合物基体(1)收缩,中间的带电聚合物薄膜(2)由于弹性聚合物基体(1)的挤压形成褶皱结构;
由于褶皱结构结构的存在,使得驻极体可拉伸。
2.根据权利要求1中所述的一种褶皱型可拉伸驻极体的制备方法,其特征在于,所述拉伸处理是单轴拉伸或多轴拉伸。
3.根据权利要求1中所述的一种褶皱型可拉伸驻极体的制备方法,其特征在于,所述聚合物薄膜(2)的厚度比弹性聚合物基体(1)小至少一个数量级。
4.根据权利要求1中所述的一种褶皱型可拉伸驻极体的制备方法,其特征在于,所述聚合物薄膜(2)的杨氏模量比弹性聚合物基体(1)大至少一个数量级。
5.根据权利要求1中所述的一种褶皱型可拉伸驻极体的制备方法,其特征在于,通过改变弹性聚合物基体(1)的拉伸倍数、两层弹性聚合物基体(1)的拉伸比例、弹性聚合物基体(1)和聚合物薄膜(2)的杨氏模量比来调控最终的驻极体的可拉伸性能。
6.根据权利要求1中所述的一种褶皱型可拉伸驻极体的制备方法,其特征在于,所述聚合物薄膜(2)为密实薄膜或者带有孔洞的薄膜,当薄膜为密实结构时,所得驻极体为单极性驻极体,当薄膜为孔洞结构时,所得驻极体为双极性驻极体。
7.根据权利要求1中所述的一种褶皱型可拉伸驻极体的制备方法,其特征在于,所述聚合物薄膜(2)材料采用四氟乙烯PTFE、聚偏二氟乙烯PVDF、聚丙烯PP、聚乙烯PE、聚对苯二甲酸PET、聚萘二甲酸乙二醇酯PEN、氟化乙丙烯共聚物FEP或环烯烃共聚物。
8.根据权利要求1中所述的一种褶皱型可拉伸驻极体的制备方法,其特征在于,所述弹性聚合物基体(1)的材料为硅橡胶材料。
9.根据权利要求1中所述的一种褶皱型可拉伸驻极体的制备方法,其特征在于,所述粘附的方法是基于弹性聚合物基体(1)本身的粘性直接粘接成型,或者使用粘接剂粘接。
10.根据权利要求1中所述的一种褶皱型可拉伸驻极体的制备方法,其特征在于,所述极化处理采用电晕极化法。
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