Effect of Heat Treatment Temperature on Properties of Ramie Fiber Reinforced Phenolic Resin Composites
Duan Chengming, Yuan Jiao, Fei Youqing
College of Materials Science and Engineering, Hunan University, Changsha 410082, China
Abstract：It was divided into 4 groups by low-cost natural ramie fiber (RF), and 3 groups were heat-treated at 150, 180, 210℃ in a nitrogen atmosphere, the other group was left untreated. Then phenolic resin/RF composites were made by vacuum impregnation and compression molding. The effects of heat treatment of RF at different temperatures on the thermal stability, dynamic mechanical properties, tensile properties, and bending properties of composites were studied and scanning electron microscope was used to observe the morphology of the fracture surface. The results show that heat-treated RF can improve the properties of its composites. When the heat treatment temperature is 180℃, the high-temperature thermal stability of the composite material is the best, its storage modulus, tensile strength, flexural strength and flexural modulus of the composite material are optimal, which are improved compared with the untreated, respectively, by 15.89%, 28.5%, 27.4% and 16.72%. When the heat treatment temperature is 150℃, the tensile modulus of the composite is optimal, which is 22.31% higher than that of the untreated. The heat treatment can effectively remove the moisture in the RF, and make the fiber and resin bond better.
Keywords：heat treatment; ramie fiber; phenolic resin; composite material; thermal stability
Duan Chengming，Yuan Jiao，Fei Youqing. Effect of heat treatment temperature on properties of ramie fiber reinforced phenolic resin composites[J]. Engineering Plastics Application，2020，48(5)：88-92.