EBS增容TPU/SEBS共混体系的相结构演变及分形特征

Phase Structure Evolution and Fractal Characteristics of EBS Compatibilized TPU/SEBS Blends

针对双乙撑酰胺(EBS)的TPU/SEBS共混体系的扫描电镜图,采用图像处理、图估计方法和分形理论定量计算体系分散相平均粒径、粒径分布宽度以及分形维数等表征相容性的参数值,随着EBS含量的变化,分析了TPU/SEBS共混体系相结构演变及分形特征的变化过程:由扫描电镜图定量计算的结果可知,随着EBS含量增加,TPU/SEBS共混体系分散相的分形维数D呈现先增大后减小趋势,分布宽度σ和分散相的平均粒径da呈现先减小后增大趋势;当含量为6%时,分散效果最佳,此时,分散相平均粒径da和分布宽度σ相对最小,分形维数D相对最大,相容性最佳。红外光谱法表明,当EBS含量为6%时,TPU/SEBS相容性最佳,从而验证了这一规律.

Scanning electron micrograph of TPU/SEBS blend for diethylene amide (EBS) was analyzed. Image processing, image estimation method and fractal theory were used to quantitatively calculate the average particle size of dispersed phase, particle size distribution width and fractal dimension which characterized the compatibility. The phase structure evolution and fractal characteristics of TPU/SEBS blends were studied with the change of EBS content. The results showed that the fractal dimension D of the dispersed phase of TPU/SEBS blends increased first and then decreased with the increase of EBS content, while the distribution width σ and the average particle size da of the dispersed phase decreased first and then increased. When the content was 6%, the dispersion effect was best. At this time, the average particle size da and distribution width σ of the dispersed phase were smallest relatively , the fractal dimension D was largest, and the compatibility was the best. Infrared spectroscopy also showed that the TPL/SEBS compatibility was the best when the EBS content was 6%, and the rule was verified.