碳化硼-有机硅二维层状复合材料的制备与动态力学性能

Preparation and dynamic mechanical properties of boron carbide and organosilicon two-dimensional laminated composites

科技发展对材料性能提出越来越高的要求,通过对材料内部结构进行有序排列使其在特定方向上实现性能最佳发挥是目前解决高性能应用需求的一个有效的方法。传统单向冷冻技术无法实现二维有序结构的制备。通过双向冷冻方法制备了厘米级的单取向碳化硼(B_(4)C)层状结构支架,在其层间填充聚二甲基硅氧烷(PDMS)制备出具有各向异性的碳化硼-有机硅二维层状复合材料。复合材料的A生长面为PDMS和B_(4)C骨架的交替排列结构,B生长面为海浪状的堆叠结构,且层状支架在复合材料中保持着明显的二维有序层状结构。复合材料面内最大动态模量各向异性比可达12.9,动态模量表现出明显的佩恩效应。这种方法为二维层状有序复合材料的制备提供新思路。

The development of science and technology has put forward higher and higher requirements for material properties.It is an effective way to achieve the best performance in a specific direction by ordering the internal structure of materials.However,the traditional one-way freezing technology cannot achieve the preparation of twodimensional ordered structure.B_(4)C layered scaffolds with single orientation were prepared by bidirectional freezing method.The layered scaffolds were filled with polydimethylsiloxane(PDMS)to prepare the two-dimensional layered boron carbide and organosilicate composites with anisotropy.There is an alternate arrangement structure of PDMS and B_(4)C skeleton at the growth plane of A in the composite material.It is a stacked structure like ocean waves at the growth plane of B.The layered scaffold maintains an obvious two-dimensional ordered layered structure in the composite material.The maximum in-plane anisotropy ratio of dynamic modulus of the composite can reach 12.9,and the dynamic modulus shows obvious Payne effect.It provides some new methods and ideas for the preparation of anisotropic composite material systems.