机械混炼制备碳纳米管/天然橡胶复合材料特性分析

通过机械混炼方法将碳纳米管与天然橡胶复合，与炭黑补强样品相比，碳纳米管在橡胶中的混入速度快，功率消耗低，温升幅度小，混炼胶的硫化焦烧时间略有增加，硫化返原现象减轻，硫化剂用量应适当增加。加入碳纳米管后，橡胶DSC曲线中的结晶熔融峰面积减少，交联反应放热峰变宽。碳纳米管复合材料的回弹、压缩疲劳性能明显优于炭黑补强样品，耐老化性能较好，拉伸、撕裂性能水平有待提高。

Characteristics of carbon nanotubes/natural rubber composites prepared by mechanical mixing

The characteristics of rubber composites,which are prepared by mechanical mixing,filled with carbon nanotubes were studied,and the analysis contrast to samples filled with carbon black was made.The results show that mixing nanotubes into rubber is fast,and the energy consumptions in course of mixing are saved.The scorch time of rubber filled with carbon nanotubes increases slightly with respect to sample filled with carbon black,and the curing reversion reduces.After the adding of carbon nanotubes,the area of crystal-melting peak in DSC curve of rubber decreases,and the width of exotherm peak belongs to cure reaction increases.In the rubber composites prepared by mechanical mixing,carbon nanotubes aggregate in some areas.The rebound degree,the dynamic compress properties and the aging properties of rubber composites filled with carbon nanotubes are more superior to that of rubber filled with carbon black.At the same time,the tensile and tear properties of rubber composites filled with carbon nanotubes need to improve.