对位芳纶短切纤维对聚苯腈树脂力学性能的影响

Effect of short⁃cut p⁃aramid fibers on mechanical properties of polyacrylonitrile resin

利用氯磺酸磺化对位短切芳纶纤维表面来引入—SO_(2)Cl基团,40 mmol/L的氯磺酸磺化改性效果最佳。利用苯基三乙氧基硅烷偶联剂对对位短切芳纶纤维进行二次改性,成功在纤维表面接枝偶联剂。将改性对位短切芳纶纤维与苯腈单体采取原位聚合方法制备聚苯腈/对位短切芳纶纤维复合材料,研究不同纤维含量对复合材料力学性能的影响。结果表明,其中纤维含量为0.5%(质量分数,下同)时,复合材料力学性能最佳,储能模量达4137 MPa,玻璃化转变温度达350℃,弯曲模量达4467 MPa。

The surface of short⁃cut p⁃aramid fibers was modified with chlorosulfonic acid to introduce—SO_(2)Cl groups.An optimal modification effect was achieved at a chlorosulfonic acid concentration of 40 mmol/L.The fibers were modi⁃fied by using phenyltriethoxysilane as a coupling agent,and the coupling agent was successfully grafted onto the fiber sur⁃face.The polyacrylonitrile/p⁃aramid fiber composites were prepared through in⁃situ polymerization of modified p⁃aramid fiber with benzonitrile monomer.The effect of fiber content on the mechanical properties of the composites was investi⁃gated.The composite obtained optimal mechanical properties at a fiber content of 0.5 wt%,and its storage modulus,glass transition temperature,and bending modulus reached 4,137 MPa,350℃,and 4,467 MPa,respectively.