Relationship between the structure and thermal properties of polypropylene/graphene nanoplatelets composites for different platelet-sizes
Relationship between the structure and thermal properties of polypropylene/graphene nanoplatelets composites for different platelet-sizes
复制标题
不同片尺寸聚丙烯/石墨烯纳米片复合材料结构与热性能的关系
DOI：
10.1016/j.compscitech.2019.107826
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发表时间：
2019-10
期刊：
影响因子：
--
通讯作者：
Pengzhang
中科院分区：
文献类型：
--
作者：
Ziwei Xu;Suihua He;Jingjing Zhang;Shijun Huang;Anfu Chen;Xialing Fu;Pengzhang
采用熔融挤出法制备了不同类型的石墨烯纳米片(GNPs)及其混杂体系增强的PP纳米复合材料。在实验分析和模拟的基础上，系统研究了影响PP/GNPs纳米复合材料热性能的因素，包括GNPs的尺寸、质量分数和不同尺寸的GNPs的比例。当GNPs含量较高时(9，12 wt%)，GNPs在PP中广泛分布，基本形成热路径。GNPs的尺寸和热学性质决定了复合材料的导热系数。当GNPs含量较低时(6 wt%)，对于单一体系而言，直径越大且分布适中越有利于获得较高的导热系数，说明热路径的形成对导热系数有很大影响。对于混杂体系，当中、小直径GNPs的比例为8：2时，填充中、小直径GNPs的PP具有最高的导热系数，比填充小直径GNPs的单一体系高23.8%。更准确地说，小直径的GNPs在连接分散的中直径GNPs时起到了作用，因为形成了大量的热路径。这表明不同GNPs协同作用下的分布状态对PP/GNPs纳米复合材料的导热系数有显著影响。此外，还研究了不同GNPs之间的协同作用对GNPs增强PP复合材料导热性能的影响。热流图像表明不同尺寸的GNPs之间存在协同效应。
Polypropylene (PP) nanocomposites reinforced with different types of graphene nanoplatelets (GNPs) and their hybrid systems are prepared via melt extrusion. On the basis of experimental analysis and simulation, the factors of thermal property of the PP/GNPs nanocomposites, including GNPs size, weight fraction and proportion of various sizes, are systematically investigated. At high GNPs content (9,12 wt %), GNPs are widely distributed in PP matrix and the thermal paths are basically formed. The thermal conductivity of composites is determined by the size and thermal properties of GNPs. At low GNPs content (6 wt %), for single system, the larger diameter with moderate distribution would be more conducive to achieve the higher thermal conductivity, indicating the formation of thermal paths dramatically affects the thermal conductivity. For hybrid system, the PP filled with medium and small diameter GNPs obtains the highest thermal conductivity when the ratio of medium diameter GNPs to small diameter GNPs is 8:2, and is 23.8% higher than the single system of PP filled with small diameter GNPs. More precisely, the small diameter GNPs play a role in connecting the scattered medium diameter GNPs, as mass thermal paths are formed. This shows that the distribution state by combining the synergistic effect of various GNPs significantly affects the thermal conductivity of PP/GNPs nanocomposites. Moreover, a numerical simulation dealing with the synergistic effect of different GNPs, is developed on the thermal conductivity of GNPs-reinforced PP matrix. The heat flux images demonstrate the existence of synergistic effect between different sizes of GNPs.
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影响因子：
17.1
作者：
Marconnett, Amy M.;Yamamoto, Namiko;Goodson, Kenneth E.
通讯作者：
Goodson, Kenneth E.
影响因子：
4.4
作者：
Feng Zhang;Qiuying Li;Yujin Liu;Shijie Zhang;Chifei Wu;Weihong Guo
通讯作者：
Feng Zhang;Qiuying Li;Yujin Liu;Shijie Zhang;Chifei Wu;Weihong Guo
影响因子：
13.1
作者：
Kong, K. T. S.;Mariatti, M.;Busfield, J. J. C.
通讯作者：
Busfield, J. J. C.
影响因子：
4
作者：
M. Hung;O. Choi;Y. Ju;H. Hahn
通讯作者：
M. Hung;O. Choi;Y. Ju;H. Hahn
影响因子：
3.5
作者：
M. Safdari;M. Al-Haik
通讯作者：
M. Safdari;M. Al-Haik