Simultaneously enhanced thermal conductivity and mechanical properties of PP/BN composites via constructing reinforced segregated structure with a trace amount of BN wrapped PP fiber
Simultaneously enhanced thermal conductivity and mechanical properties of PP/BN composites via constructing reinforced segregated structure with a trace amount of BN wrapped PP fiber
复制标题
微量BN包裹PP纤维构建增强偏析结构同时增强PP/BN复合材料的导热性能和力学性能
DOI：
10.1016/j.cej.2020.124563
复制
发表时间：
2020-06-15
影响因子：
15.1
通讯作者：
Guo, Shaoyun
中科院分区：
文献类型：
--
作者：
Li, Xiang;Li, Chunhai;Guo, Shaoyun
具有连续填料网络但隔离基体的隔离结构是提高复合材料热导率（TC）的经典原型。然而，由于聚合物基体的不连续性导致的较差的机械性能和由填料的随机接触引起的连续填料网络的急剧改善的TC，这种原型仅发现有限的应用。在这项工作中，一个增强的隔离结构，其中连续相是由氮化硼（BN）包裹了微量的PP纤维（PF），首次提出，以提高TC和力学性能的同时。在这种强化的偏析结构中，BN在PF的表面上排列，从而形成长程有序的高导热路径。与典型的偏析结构相比，具有增强偏析结构的复合材料的TC、断裂伸长率和拉伸强度分别提高了244%、133%和103%。因此，这项工作提供了一些新的见解，设计一个隔离的结构，以平衡TC和机械性能。
Segregated structure with continuous filler network but isolated matrix is a classic prototype to increase the thermal conductivity (TC) of the composites. However, such prototype only finds limited applications due to both the poor mechanical properties originated from the discontinuity of the polymer matrix and the mediately improved TC of the continuous filler network arising from the random contact of the fillers. In this work, a reinforced segregated structure in which the continuous phase is made with boron nitride (BN) wrapped a trace amount of PP fiber (PF), is first proposed in order to enhance the TC and mechanical properties simultaneously. In such reinforced segregated structure, BN aligns on the surfaces of PF thus forms a long-range ordered, high thermal conductive pathway. As expected, an enhancement of 244%, 133% and 103% in the TC, elongation at break and tensile strength of the composite with reinforced segregated structure are successfully achieved compared with typical segregated structure. Therefore, this work offers some new insights into the design of a segregated structure to balance the TC and mechanical properties.