聚合物复合材料冷冻超薄切片技术——以等规聚丙烯/乙丙橡胶/纳米二氧化硅复合材料为例

Study on Ultrathin CryoSection Technology of Polymer Composites-A Case Study of iPP/EPR/SiO2 Composites

真实结构图像对聚合物材料的研究和改性极为重要。冷冻超薄切片技术是聚合物材料进行内部微观结构分析必要的前处理技术。根据聚合物材料分子运动随温度变化这一热力学性质,通过对等规聚丙烯/乙丙橡胶/纳米二氧化硅聚合物复合材料在不同温度下的切片实验,探究切片温度对样品的微观形态和结构的影响规律。实验发现,玻璃化转变温度是影响切片质量变化的关键点。当切片温度设定在材料的玻璃化转变温度附近时,前后所得到样品的微观形态结构呈现出显著的差异。然而,如果切片温度过低,可能会引起严重的卷片现象,不利于显微结构的观察与分辨。玻璃化转变温度是聚合物材料进行切片的最佳温度,不仅能确保获得样品的真实结构,还能够得到高质量且平整的切片。

Ultrathin cryo-section technology is a necessary pre-processing technology for the internal microstructure analysis of polymer materials.The true structure image is very important for the research and modification of polymer materials.According to the thermodynamic property that the molecular movement of polymer material changes with temperature,the section experiments of iPP/EPR/SiO2 composites are conducted at different temperatures to explore the changes and effects of section temperature on the microstructure and morphology of the sample.The experimental results show that the glass transition temperature is the turning point of the change of the section results.The microstructure of the samples obtained before and after the glass transition temperature is set have a great difference.However,too low section temperature can cause serious winding phenomenon,which is not conducive to the observation and resolution of microstructure.The glass transition temperature is the best Ultrathin cryo-section temperature for polymer materials,which not only ensures the true structure of the sample,but also can obtain high quality smooth slicing.