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以改性玻璃纤维(GF)为表层的增强材料,以共挤出技术为加工工艺,制备了芯-表结构的木塑复合材料,分析了其在芯层1和芯层2两种复合体系下的弯曲和热膨胀性能。结果表明:当表层GF加入量为0时,即为表层为纯高密度聚乙烯(HDPE)时,无论是在芯层1还是芯层2的复合体系,芯—表结构木塑复合材料的线性热膨胀系数(LTEC)高于芯层材料,其弯曲模量和弯曲强度均小于芯层材料;芯—表结构木塑复合材料(GF增强表层)的弯曲强度、模量随着表层GF加入量的增加而增加;芯—表结构木塑复合材料的热膨胀性能是表层和芯层性能共同作用的结果,在表层加入GF后,其表层材料的热膨胀系数和芯—表结构木塑复合材料同时降低,且降低趋势相近。
The core-shell structure of WPC was prepared by using the modified glass fiber (GF) as the reinforcing material and the co-extrusion technology as the processing technology. Under the bending and thermal expansion properties. The results show that when the amount of superficial GF is 0, that is, when the surface layer is pure HDPE, the linearity of the core-surface structure WPC composites, whether in the core layer 1 or the core layer 2, The coefficient of thermal expansion (LTEC) is higher than the core material, and its flexural modulus and flexural strength are both less than those of the core material. The flexural strength and modulus of the core-surface structure WPC (GF reinforced surface layer) The thermal expansion of the core-sheet structure is the result of the interaction between the surface layer and the core layer. The thermal expansion coefficient of the surface layer material and the core-sheet structure wood-plastic composite material decrease simultaneously when GF is added into the surface layer, And reduce the similar trend.