聚丙烯复合包装材料断面冲击强度的分形表征

Fractal Characterization of Section Impact Strength of Polypropylene Compound Packaging Materials

中文关键词: 复合包装材料  断面  分形维数  冲击强度

英文关键词: composite packaging materials  section  fractal dimension  impact strength

中文摘要:

      目的 定量研究不同的六钛酸钾晶须(SPTW)质量分数对PP/PP-g-MAH/SPTW复合包装材料冲击断面复杂程度的影响。方法 分别采用硅烷偶联剂KH550改性六钛酸钾晶须，将改性过的六钛酸钾晶须与聚丙烯(PP)、马来酸酐接枝聚丙烯(PP-g-MAH)通过熔融共混法制得复合材料。测试复合材料无缺口冲击强度，采用扫描电镜对六钛酸钾晶须含量不同的复合材料进行形貌分析，基于分形理论，运用盒形计数法计算复合材料冲击断面形貌的分形维数，考察复合材料断面形貌分形维数和冲击强度的关系。结果 断面分形维数值在1.4165～1.8832之间，相关系数均大于0.92，表示有强相关性，说明断面分形特性显著；复合包装材料的冲击强度与断面分形维数之间大致上呈指数函数关系。结论 聚丙烯复合包装材料冲击断面的表面分形维数能有效反映复合包装材料的宏观力学性能。

英文摘要:

      The work aims to carry out quantitative study on the effects of different mass fractions of potassium hexatitanate whisker on the impact section complexity of PP/PP-g-MAH/SPTW compound packaging materials. Silane coupling agent KH550 was used to modify potassium hexatitanate whisker. The melt-blending process was adopted to melt and blend the modified potassium hexatitanate whisker with polypropylene (PP) maleic anhydride grafted polypropylene (PP-g-MAH), so as to prepare the compound materials. The tested compound materials had no notch impact strength. Scanning electron microscopy was used to analyze the morphology of compound materials with different amounts of potassium hexatitanate whiskers. Based on fractal theory, the box counting method was applied to calculate the fractal dimension of impact section morphology of compound materials and investigate the relationship between the fractal dimension of compound material’s section morphology and the impact strength. Fractal dimension values of the section were between 1.4165 and 1.8832. When all the correlation coefficients were greater than 0.92, it indicated a strong correlation, describing that the section’s fractal characteristics were remarkable. The exponential function relationship was generally discovered between the impact strength of compound packaging materials and section’s fractal dimension. The surface fractal dimensions of impact section of polypropylene compound packing material can effectively reflect the macro-mechanical properties of composite packing materials.