皮层对皮-芯结构木塑复合材料性能的影响

发布时间：2018-05-04 19:37

本文选题：皮-芯结构 + 木塑复合材料　；参考：《南京林业大学学报(自然科学版)》2017年05期

【摘要】：【目的】研究在两种不同芯层材料的复合体系下,增强材料含量与皮层厚度对共挤出(皮-芯结构)木塑复合材料弯曲与热膨胀性能的影响。【方法】以共挤出技术为加工工艺,选取短玻璃纤维(SGF)为皮层的增强材料,制备共挤出型(皮-芯结构)木塑复合材料(WPC)。分析了在芯层1与芯层2两种复合体系下,不同皮层厚度(1.0、1.2及1.6 mm)和皮层填料含量(0%、10%、20%、30%和40%)对共挤出型皮-芯结构WPC的弯曲性能和热膨胀性能的影响。【结果】当表面为纯的高密度聚乙烯(HDPE)时,在芯层1和芯层2两个复合体系中,皮层越厚则复合材料的热膨胀系数(LTEC)越高,其热膨胀性能越差;当SGF的加入量恒定时,其LTEC随着皮层厚度的增加而降低。当皮层的弯曲模量比芯层低时,共挤出木塑复合材料的弯曲模量随着皮层厚度的升高逐渐降低;当芯层的弯曲模量比皮层低时,共挤出木塑复合材料的弯曲模量随皮层厚度的升高而升高。皮层为SGF/HDPE材料时,在芯层1和芯层2两个复合体系中,随着皮层SGF的含量从0%增加到40%时,其弯曲性能显著性提高,LTEC显著降低。当皮层的LTEC值比芯层大时,皮层厚度的降低可以降低共挤出木塑复合材料的LTEC;当皮层的LTEC值小于芯层时,共挤出木塑复合材料的LTEC随皮层厚度的增加而减少。【结论】通过改性芯层可以提高皮-芯结构木塑复合材料的整体性能,其增强趋势与表层的增强趋势相似。
[Abstract]:[objective] to study the composite systems of two different core-layer materials, The effect of the content of reinforcing material and the thickness of Cortex on the bending and Thermal expansion Properties of Wood-plastic Composites during Co-Extrusion. [methods] A short glass fiber reinforced material (SGFs) was selected as the cortical reinforcing material, and the co-extrusion technology was used as the processing technology. Co-extrusion (leather-core structure) wood-plastic composites (WPCs) were prepared. Two kinds of composite systems of core layer 1 and core layer 2 are analyzed. The effects of different cortical thickness (1.0 mm and 1.6 mm) and cortical packing content (30% and 40%) on the bending and thermal expansion properties of coextrusion leather-core structure WPC were studied. [results] when the surface was pure high density polyethylene (HDPE), In the core layer 1 and core layer 2 composite system, the thicker the cortical layer is, the higher the thermal expansion coefficient of the composites is and the worse the thermal expansion performance of the composites is, and the LTEC decreases with the increase of the thickness of the cortex when the content of SGF is constant. When the bending modulus of the cortical layer is lower than that of the core layer, the bending modulus of the co-extruded wood-plastic composite decreases with the increase of the thickness of the cortical layer, and when the bending modulus of the core layer is lower than that of the cortical layer, The bending modulus of co-extruded wood-plastic composites increases with the increase of cortical thickness. When the cortical layer is a SGF/HDPE material, the bending properties of the composite system of core layer 1 and core layer 2 decrease significantly with the increase of cortical SGF content from 0% to 40%. When the LTEC value of the cortex is larger than that of the core layer, the decrease of the thickness of the cortex can reduce the LTEC of the co-extruded wood-plastic composite, and when the LTEC value of the cortex is smaller than that of the core layer, The LTEC of co-extruded wood-plastic composites decreases with the increase of the thickness of the cortex. [conclusion] the overall properties of wood-plastic composites with leather core structure can be improved by the modified core layer, and the strengthening trend is similar to that of the surface layer.
【作者单位】：南京林业大学材料科学与工程学院;School
【基金】：中国博士后基金特别资助项目(2017T100313);中国博士后基金面上项目(2016M601821) 江苏省博士后基金A类项目(1601027A) 国家自然科学基金项目(31500483,31400502) 国家留学基金博士后项目(201508320022) 江苏高校优势学科建设工程资助项目(PAPD)
【分类号】：TB332

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