聚苯酯和碳纤维改性PTFE力学性能研究

Study on Mechanical Properties of Polyphenylene Ester and Carbon Fiber Modified PTFE

为了强化PTFE材料的力学性能,采用碳纤维(CF)和聚苯酯(POB)先后对PTFE进行填充改性,考察不同含量的CF和POB对PTFE复合材料的表面粗糙度、玻璃化转变温度、压缩和拉伸性能影响。结果表明:复合材料的表面粗糙度随着CF含量的增加而增大,质量分数20%CF改性PTFE的粗糙度高达10.02μm;当CF质量分数恒定为20%时,复合材料的表面粗糙度随着POB含量的增加而减小;CF和POB的加入使得PTFE的玻璃化转变温度略有提高;随着CF和POB含量的增加,复合材料的压缩模量、压缩强度以及拉伸模量增加,但拉伸强度有所降低,拉伸断口均呈现基体与填充物的丝块状连结。CF和POB的刚性较PTFE基体大,在压缩过程中可以有效承担载荷,从而强化压缩性能;但因填充物和PTFE界面结合能力差,分子间作用力小,因此拉伸强度降低。

In order to enhance the mechanical properties of PTFE materials,carbon fiber(CF)and polybenzoate(POB)were used to modify PTFE materials.The effects of different contents of CF and POB on the surface roughness,glass transition temperature,compression and tensile properties of PTFE composites were investigated.The results show that the surface roughness of the composites increases with the increase of CF content,with a roughness of up to 10.02μm for PTFE composite with CF mass fraction of 20%.When the CF mass fraction remains constant at 20%,the surface roughness of the composites decreases with the increase of POB content.The addition of CF and POB slightly increases the glass transition temperature of PTFE composites.With the increase of CF and POB content,the compressive modulus,compressive strength and tensile modulus of PTFE composites increases,but the tensile strength decreases,and the tensile fractures show a filamentous connection between the matrix and the filler.CF and POB has higher rigidity than PTFE matrix and can effectively bear the load during compression process,thereby enhancing the compression performance.However,due to the poor bonding ability between the filler and PTFE interface,the intermolecular force is small,resulting in a decrease in tensile strength.