木质素对苯乙烯/丁二烯/苯乙烯/乙烯基吡啶嵌段聚合物的填充改性

Filling Modification of Pyridyl-functionalized Polystyrene/polybutadiene /polystyrene Elastomer with Lignin

玉米秸秆酶解木质素为原料,通过溶液浇铸的方法制备了不同含量木质素填充的吡啶基官能化苯乙烯/丁二烯/苯乙烯嵌段共聚物(SBS)膜材料,借助力学性能测试以及TG、SEM等分析手段,研究了木质素的含量对吡啶基官能化SBS(SBSVP)性能的影响。拉伸试验结果表明,SBSVP中加入适量的木质素可以提高弹性体的力学性能,在木质素质量分数6%时,SBSVP的拉伸强度可达12.6 MPa,断裂伸长率可达840%,比未填充SBSVP拉伸强度和断裂伸长率分别增加32.63%和3.83%;SEM分析表明,木质素与SBSVP的相容性较好,二者不存在明显的界面;TG分析表明,木质素填充SBSVP后,在受热降解前期失重大于纯的SBSVP,但中后期其最大分解速率低于纯的SBSVP,相应的最大分解速率温度高于纯的SBSVP,且最终材料的质量保留率高于未填充的SBSVP,表现出热稳定性的提高。

The pyridyl-functionalized polystyrene/polybutadiene/polystyrene （ SBS ） membrane materials filled with various contents of lignin were prepared through solution casting. The effects of lignin contents on the performances of pynidyl-functionalized SBS （ SBSVP） were studied by mechanical property testing and analysis of thermogravimetry analysis （ TGA） and scanning electron microscopy （ SEM） . The tensile test results showed that the mechanical properties of SBSVP elastomer could be improved by the filling of lignin. The tensile strength and elongation for the SBSVP with 6% lignin were 12. 6MPa and 840%. Compared with the unfilled SBSVP, the tensile strength and elongation at break of modified SBSVP increased for 32. 63% and 3. 83% respectively. The SEM analysis indicated that there was no remarkable interface between lignin and SBSVP, which showed an excellent interface compatibility. The TG analysis indicated that the SBSVP filled with lignin showed a higher weight loss than the pure SBSVP in the preliminary thermal degradation. In the middle and later periods of thermal degradation, the maximum decomposition speed of SBSVP filled with lignin was lower than that of pure SBSVP, and the corresponding maximum decomposition temperature was higher than that of pure SBSVP. In addition, the final weight retention of material filled with lignin was higher than that of pure SBSVP. This displayed the increase of thermal stability when SBSVP was filled by lignin.