AgNPs/BNNSs杂化填料增强PI导热性能有限元模拟
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摘要
基于随机添加算法和均匀化理论,通过有限元方法,建立纳米银/氮化硼纳米片(AgNPs/BNNSs)杂化填料填充聚酰亚胺(PI)的三维随机代表体积单元RVE模型,并选用Abaqus软件对复合材料的导热性能进行模拟,研究了填料不同填充含量及AgNPs粒径对PI热导率的影响。结果显示,随着杂化填料含量的增加,PI/AgNPs/BNNSs复合材料的热导率不断增加,而且明显高于PI/BNNSs复合材料的热导率;当AgNPs的粒径减小时,PI/AgNPs/BNNSs复合材料的导热性能有所增加,并在AgNPs粒径为10nm,质量分数为20%时达到最大热导率2.189W/(m·K);且随着填料质量分数的增加,PI/AgNPs/BNNSs复合材料的导热性能逐渐趋于各向同性。
Based on random addition algorithm and homogenization theory,hybrid ?llers made of boron nitride nanosheets(BNNSs) and silver nanoparticles(AgNPs) was added in polyimide matrix,a three-dimensional random representative volume element(RVE) model of AgNPs/BNNSs hybrid ?ller ?lled with polyimide was established,Abaqus software was used to simulate the thermal conductivity of composite materials through the ?nite element method. The in?uence of ?lling content and the diameter of AgNPs on the thermal conductivity of the composite were studied. The results show that the thermal conductivity of the PI/AgNPs/BNNSs composites increases with the increase of the ?lling content of the hybrid ?ller,and is signi?cantly higher than the PI/BNNSs composites using single BNNSs as ?ller. With the decrease of the diameter of AgNPs,the thermal conductivity of the PI/AgNPs/BNNSs composites is increased and reaches a maximum value of 2.189 W/(m · K) when the AgNPs diameter is 10 nm. In addition,with the increase of ?ller mass fraction,the thermal conductivity of PI/AgNPs/BNNSs composites tended to be isotropic.
Based on random addition algorithm and homogenization theory,hybrid ?llers made of boron nitride nanosheets(BNNSs) and silver nanoparticles(AgNPs) was added in polyimide matrix,a three-dimensional random representative volume element(RVE) model of AgNPs/BNNSs hybrid ?ller ?lled with polyimide was established,Abaqus software was used to simulate the thermal conductivity of composite materials through the ?nite element method. The in?uence of ?lling content and the diameter of AgNPs on the thermal conductivity of the composite were studied. The results show that the thermal conductivity of the PI/AgNPs/BNNSs composites increases with the increase of the ?lling content of the hybrid ?ller,and is signi?cantly higher than the PI/BNNSs composites using single BNNSs as ?ller. With the decrease of the diameter of AgNPs,the thermal conductivity of the PI/AgNPs/BNNSs composites is increased and reaches a maximum value of 2.189 W/(m · K) when the AgNPs diameter is 10 nm. In addition,with the increase of ?ller mass fraction,the thermal conductivity of PI/AgNPs/BNNSs composites tended to be isotropic.
引文
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[8]Lee H L,Kwon O H,Ha S M,et al.Thermal conductivity improvement of surface-enhanced polyetherimide(PEI)composites using polyimide-coated h-BN particles[J].Physical Chemistry Chemical Physics,2014,16(37):20 041-20 046.
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