CN109575456A - 一种多元杂化各向异性热扩散膜的制备方法 - Google Patents

一种多元杂化各向异性热扩散膜的制备方法 Download PDF

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CN109575456A
CN109575456A CN201811261887.4A CN201811261887A CN109575456A CN 109575456 A CN109575456 A CN 109575456A CN 201811261887 A CN201811261887 A CN 201811261887A CN 109575456 A CN109575456 A CN 109575456A
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罗富彬
颜品萍
李红周
钱庆荣
陈庆华
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Fujian Normal University
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Abstract

本发明公开一种多元杂化各向异性热扩散膜的制备方法,包括如下步骤:按质量比称取二维纳米片或者改性二维纳米片、一维纳米线或者改性一维纳米线和水溶性高分子物质;将二维纳米片或者改性二维纳米片加入至一定量的水中,超声分散形成悬浮液,再按照比例加入一维纳米线或者改性一维纳米线,超声分散,最后加入称量好的水溶性高分子物质,搅拌,倒入模具,除去溶剂,热压,冷却,获得多元杂化各向异性热扩散膜,具有各向异性热扩散,平面方向的热扩散系数是垂直方向热扩散系数的5倍以上。

Description

一种多元杂化各向异性热扩散膜的制备方法
技术领域
本发明属于导热材料领域,特别涉及各向异性高导热复合材料的制备。
背景技术
目前,电子器件正快速往集成化和微型化方向发展,与此同时,电子产品的处理器功能越来越强,功耗越来越大,造成的结果是大量热堆积。因此,热管理对于现代电子设备来说是一项重大挑战,控制热量的定向传输对延长电子设备的使用寿命和降低信号干扰具有重要意义。比如常用的智能手机一般采用在手机内表面粘贴散热膜,以贴合手机电池等发热部件与外壳,快速将热量传导扩散。
常用的高导热膜材料是石墨膜,石墨膜是一种具有独特结构的新型高导热材料,由于石墨膜的柔性以及片层结构,使其能够适应各种散热平面、屏蔽热源以及组件,同时石墨膜表面可以与金属、不干胶、塑胶等其它材料复合使用以满足更多的设计功能和需要。20世纪60年代,获取石墨膜的方法是在3400-3600 °C的高温、10MPa的高压条件下,采用高温热解沉积技术制备。然而,该制备方法成本高、制备周期长,因此在大规模制备过程中受到限制。随后,经过长期的探索,科学家们发现聚酰亚胺(PI)经过炭化、2800-3200 °C高温石墨化处理后,可以获得高定向的石墨薄膜。由此可以看出,石墨膜的制备需要经过超高温以及高压等条件。
石墨烯及其衍生物的发展为制备高导热膜提供了新的路径。由于石墨烯以及氧化石墨烯的二维层状结构,通过一些较简单的组装手段就可以获取石墨烯片层的定向排列,从而制备各种功能性膜材料。石墨烯膜的出现进一步扩宽了石墨烯基材料的应用领域。为了获取不同的性能,聚合物、半导体材料以及金属都可以与纳米片进行复合,通过结构调控,制备功能性的石墨烯膜。
发明内容
本发明的首要目的是提供一种多元杂化各向异性热扩散膜。
本发明的另一目的在于提供一种上述热扩散膜的制备方法。
本发明的目的通过下述技术方案实现:
一种多元杂化各向异性热扩散膜的制备方法,包括如下步骤:1)按质量比称取二维纳米片或者改性二维纳米片、一维纳米线或者改性一维纳米线和水溶性高分子物质;2)将二维纳米片或者改性二维纳米片加入至一定量的水中,超声分散形成悬浮液,再按照比例加入一维纳米线或者改性一维纳米线,超声分散,最后加入称量好的水溶性高分子物质,搅拌,倒入模具,除去溶剂,热压,冷却,获得多元杂化各向异性热扩散膜。
所述的水溶性高分子物质为聚氧乙烯、聚乙烯醇、聚丙烯酸或聚丙烯酰胺;二维纳米片为石墨烯、氧化石墨烯、氮化硼或二硫化钼;一维纳米线为碳纳米管、碳化硅纳米线或纳米银线。
所述改性二维纳米片和改性一维纳米线是指通过化学或者物理的形式对二维纳米片状或者一维纳米材料进行表面改性,以提高其与水溶性高分子物质的相容性。
当水溶性高分子物质质量为1时,二维纳米片或者改性二维纳米片的质量为0.1-10, 一维纳米线或者改性一维纳米线的质量为0.1-10。
将二维纳米片或者改性二维纳米片加入至一定量的水中,所述的二维纳米片或者改性二维纳米片与水的比例为0. 5-20 mg/ml。
改性二维纳米片为改性石墨烯、改性氮化硼或改性二硫化钼。本发明优选KH550等偶联剂改性。
本发明上述制备方法制得的多元杂化各向异性热扩散膜。
本发明所述的多元杂化各向异性热扩散膜,其特征在于:所述多元杂化各向异性热扩散膜包括三种或者三种以上组分,其中组分一为可水溶性高分子物质,组分二为高导热二维纳米片或者改性二维纳米片;组分三为一维纳米线或者改性一维纳米线。
所述多元杂化各向异性热扩散膜具有各向异性热扩散,平面方向的热扩散系数是垂直方向热扩散系数的5倍以上。
所述的除去溶剂的方式为室温挥发、烘干以及真空烘干。
本发明的优点在于:通过简单的技术手段,能够将二维纳米材料与一位纳米材料均匀分散在基材中,二维纳米片取向排列,一位纳米线作为“导热桥”链接二维纳米线片,使其在水平方向上具有较高的热扩散速率,制备的导热膜具有较高的各项异性热扩散系数、良好的柔顺性和力学强度。
附图说明
图1是制备的层状多元热扩散膜的侧面SEM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:
按质量比1:3:1称取石墨烯、碳化硅纳米线和聚乙烯醇,首先将石墨烯加入至水中,超声分散,配成浓度为5mg/mL液体,然后按照上述比例加入碳化硅纳米线,超声分散后,再加入称量好的聚乙烯醇,磁力搅拌3小时后,倒入模具,鼓风30℃烘干,剥离得到薄膜,80℃热压。
实施例2:
按质量比5:3:1称取KH550表面改性氮化硼、碳化硅纳米线和聚氧乙烯,首先将改性氮化硼加入至水中,超声分散,配成浓度为3(mg/mL)液体,然后按照上述比例加入碳化硅纳米线,超声分散后,再加入称量好的高分子,磁力搅拌3小时后,倒入模具,自然风干,剥离得到薄膜,40℃热压。
上述KH550表面改性氮化硼的方法为:将10g KH550溶于200ml乙醇溶液(95%),搅拌30分钟,加入30g氮化硼粉末, 60℃搅拌5h后,洗涤过滤3次, 60℃真空干燥后获得改性氮化硼粉末。
实施例3:
按质量比10:0.1:1称取氧化石墨烯、碳纳米管和聚氧乙烯,首先将氧化石墨烯加入至水中,超声分散,配成浓度为20(mg/mL)液体,然后按照上述比例加入碳纳米管,超声分散后,再加入称量好的高分子,磁力搅拌6小时后,倒入模具,自然风干,剥离得到薄膜,40℃热压。
实施例4:
按质量比0.5:0.1:1称取KH550表面改性氧化石墨烯、纳米银线和聚氧乙烯,首先将改性石墨烯加入至水中,超声分散,配成浓度为0.5(mg/mL)液体,然后按照比例加入纳米银线,超声分散后,再加入称量好的高分子,磁力搅拌3小时后,倒入模具,自然风干,剥离得到薄膜,60℃热压。
上述KH550表面改性氧化石墨烯的方法为:称取5g氧化石墨烯粉末,溶于150ml去离子水中,加入2g KH550, 超声分散30min,80℃反应24小时。然后取出,用去离子水洗涤过滤3次, 60℃真空干燥。
实施例5:
按质量比10:1:1称取氧化石墨烯、碳化硅纳米线和聚丙烯酸,首先将氧化石墨烯加入至水中,超声分散,配成浓度为5(mg/mL)溶液,然后按照比例加入碳化硅纳米线,超声分散后,再加入称量好的高分子,磁力搅拌3小时后,倒入模具,自然风干,剥离得到薄膜,40℃热压。
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 (9)

1.一种多元杂化各向异性热扩散膜的制备方法,包括如下步骤:1)按质量比称取二维纳米片或者改性二维纳米片、一维纳米线或者改性一维纳米线和水溶性高分子物质;2)将二维纳米片或者改性二维纳米片加入至一定量的水中,超声分散形成悬浮液,再按照比例加入一维纳米线或者改性一维纳米线,超声分散,最后加入称量好的水溶性高分子物质,搅拌,倒入模具,除去溶剂,热压,冷却,获得多元杂化各向异性热扩散膜。
2.根据权利要求1所述的制备方法,其特征在于:所述的水溶性高分子物质为聚氧乙烯、聚乙烯醇、聚丙烯酸或聚丙烯酰胺;二维纳米片为石墨烯、氧化石墨烯、氮化硼或二硫化钼;一维纳米线为碳纳米管、碳化硅纳米线或纳米银线。
3.根据权利要求1所述的制备方法,其特征在于:所述改性二维纳米片和改性一维纳米线是指通过化学或者物理的形式对二维纳米片状或者一维纳米材料进行表面改性,以提高其与水溶性高分子物质的相容性。
4.根据权利要求1所述的制备方法,其特征在于:当水溶性高分子物质质量为1时,二维纳米片或者改性二维纳米片的质量为0.1-10, 一维纳米线或者改性一维纳米线的质量为0.1-10。
5.根据权利要求1所述的制备方法,其特征在于:将二维纳米片或者改性二维纳米片加入至一定量的水中,所述的二维纳米片或者改性二维纳米片与水的比例为0. 5-20 mg/ml。
6.根据权利要求3所述的制备方法,其特征在于:改性二维纳米片为改性石墨烯、改性氮化硼或改性二硫化钼。
7.权利要求1-6任一制备方法制得的多元杂化各向异性热扩散膜。
8.根据权利要求7所述的多元杂化各向异性热扩散膜,其特征在于:所述多元杂化各向异性热扩散膜包括三种或者三种以上组分,其中组分一为可水溶性高分子物质,组分二为高导热二维纳米片或者改性二维纳米片;组分三为一维纳米线或者改性一维纳米线。
9.根据权利要求7所述的多元杂化各向异性热扩散膜,其特征在于:所述多元杂化各向异性热扩散膜具有各向异性热扩散,平面方向的热扩散系数是垂直方向热扩散系数的5倍以上。
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