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Fabricating high thermal conductivity rGO/polyimide nanocomposite films via a freeze-drying approach†
RSC Advances ( IF 3.9 ) Pub Date : 2018-06-15 00:00:00 , DOI: 10.1039/c8ra00827b Shiyang Wei 1 , Qiaoxi Yu 1 , Zhenguo Fan 1 , Siwei Liu 1 , Zhenguo Chi 1 , Xudong Chen 1 , Yi Zhang 1 , Jiarui Xu 1
RSC Advances ( IF 3.9 ) Pub Date : 2018-06-15 00:00:00 , DOI: 10.1039/c8ra00827b Shiyang Wei 1 , Qiaoxi Yu 1 , Zhenguo Fan 1 , Siwei Liu 1 , Zhenguo Chi 1 , Xudong Chen 1 , Yi Zhang 1 , Jiarui Xu 1
Affiliation
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The preparation of polymeric composite materials with low filler content as well as high thermal conductivity has been an important subject for the field of polymer material research. During our recent investigation on polyimide (PI), it was found that poly(amic acid) (PAA) solution (in dimethylacetamide, DMAc) could crystallize at low temperature. When adding reduced graphene oxide (rGO) as the thermal conductive fillers in the PAA solution, it was also found that the crystallization process of PAA would impel the rGO to rearrange in order and form an aligned thermal conductive network. To retain the rGO network structure, the freeze-drying technique was used to remove the solvent. Subsequently, through a thermal imidization process the final rGO/PI films containing a 3D rGO network could be obtained. The PI composite films retain good flexibility, excellent thermal stability, and exhibit excellent thermal conductivity. When the content of rGO added is 8 wt%, the thermal conductivity of the rGO/PI film can reach a high value of 2.78 W m−1 K−1, which is about 15.4 times that of neat PI and 5.5 times that of the rGO/PI composite film prepared by the conventional two-step routine with the same content of rGO.
中文翻译：
通过冷冻干燥方法制备高导热性 rGO/聚酰亚胺纳米复合薄膜†
低填料含量、高导热率的高分子复合材料的制备一直是高分子材料研究领域的重要课题。在我们最近对聚酰亚胺（PI）的研究中，发现聚酰胺酸（PAA）溶液（在二甲基乙酰胺，DMAc中）可以在低温下结晶。当在PAA溶液中添加还原氧化石墨烯（rGO）作为导热填料时，还发现PAA的结晶过程会促使rGO有序重新排列并形成排列的导热网络。为了保留rGO网络结构，使用冷冻干燥技术去除溶剂。随后，通过热酰亚胺化过程，可以获得包含3D rGO网络的最终rGO/PI薄膜。 PI复合薄膜保留了良好的柔韧性、优异的热稳定性，并表现出优异的导热性。当rGO添加量为8 wt%时，rGO/PI薄膜的导热系数可达到2.78 W m -1 K -1的高值，约为纯PI的15.4倍，纯PI的5.5倍。采用常规两步法制备出相同rGO含量的rGO/PI复合薄膜。
更新日期：2018-06-15
中文翻译：
通过冷冻干燥方法制备高导热性 rGO/聚酰亚胺纳米复合薄膜†
低填料含量、高导热率的高分子复合材料的制备一直是高分子材料研究领域的重要课题。在我们最近对聚酰亚胺（PI）的研究中，发现聚酰胺酸（PAA）溶液（在二甲基乙酰胺，DMAc中）可以在低温下结晶。当在PAA溶液中添加还原氧化石墨烯（rGO）作为导热填料时，还发现PAA的结晶过程会促使rGO有序重新排列并形成排列的导热网络。为了保留rGO网络结构，使用冷冻干燥技术去除溶剂。随后，通过热酰亚胺化过程，可以获得包含3D rGO网络的最终rGO/PI薄膜。 PI复合薄膜保留了良好的柔韧性、优异的热稳定性，并表现出优异的导热性。当rGO添加量为8 wt%时，rGO/PI薄膜的导热系数可达到2.78 W m -1 K -1的高值，约为纯PI的15.4倍，纯PI的5.5倍。采用常规两步法制备出相同rGO含量的rGO/PI复合薄膜。
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