热重分析法测定乳液共沉法天然橡胶复合材料的组分含量

Determination of Component Content of Co-precipitated NR Composites by Thermogravimetric Analysis

通过乳液共沉法制备了天然橡胶(NR)/白炭黑、NR/木粉和NR/木粉/白炭黑3种复合材料。采用热重(TG)分析法分别研究各组分及其复合材料的热质量变化过程,并根据单一组分在特定温度下的质量损失,基于残余物含量一定的方法计算出3种NR复合材料中各组分的实际含量。结果表明,复合材料各组分实际含量与其理论含量有一定偏差,证实乳液共沉工艺会造成复合材料中组分质量损失,在使用乳液共沉工艺制备复合材料时需注意调控工艺条件和原材料配比。通过TG分析仪结合理论计算方式测定用乳液共沉法制备的NR复合材料的组分含量具有很好的可操作性,可为乳液共沉工艺研究提供参考。

Three kinds of Natural rubber (NR)based composites,such as NR/silica,NR/wood flour and NR/wood flour/silica composites were prepared by emulsion co-precipitation method.Each component and the composites were characterized by thermogravimetric analysis test method.According to the loss weight of different components at specific temperatures,the actual content of each component in three kinds of NR composites was calculated based on the constant residual content.It was found that there was a certain deviation between the actual content of the composite components and its theoretical content, which confirmed that the emulsion co-precipitation process would cause the mass loss of the components. The emulsion co-precipitation process conditions and the ratio of raw materials should be adjusted.The determination of the composition of the co-precipitated NR composites by the thermogravimetric analysis combined with theoretical calculation had good operability,and the result had reference value for the study of emulsion co-precipitation process.