木质素填充改性SBS弹性体的性能

摘要

The styrene/butadiene/styrene block copolymer(SBS)membrane materials filled with various contents of corn straw lignin were prepared through solution casting. The effects of lignin contents on the performances of SBS were studied by mechanical property testing,dynamic mechanical analysis(DMA) and cone calorimeter test. The tensile test results showed that the mechanical properties of SBS elastomer could be improved by filling with lignin. The tensile strength and elongation at break for the SBS with 6% lignin were 22.8MPa and 2400%,respectively. Compared with the unfilled SBS,the tensile strength and elongation at break of modified SBS increased by 32% and 15% respectively. The DMA analysis indicated that the storage modulus and the glass-transition temperature(Tg)were also improved by filling with lignin. The cone calorimeter test results showed that the total heat release(THR)and the specific extinction area(SEA)were reduced by filling with lignin. The rate of mass loss was slower,which indicated that the flame retardant property of SBS was improved by filling with corn straw lignin.%以玉米秸秆木质素为填充剂，利用溶液浇铸的方法制备了不同木质素填充的苯乙烯/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动态力学分析（DMA)、锥形量热分析等手段，研究了木质素的填充对SBS力学性能和燃烧性能的影响。拉伸试验结果表明，木质素的填充能使SBS的力学性能提高，在木质素质量分数为6%时，SBS膜的拉伸强度可达到22.8MPa，断裂伸长率可达2400%，比未添加木质素时分别增加了32%和15%。DMA分析表明，木质素填充SBS后，弹性体的模量和玻璃化转变温度提高。锥形量热分析可以看出，木质素的添加降低了SBS燃烧过程中的总热释放量，并且使燃烧后的烟量减少；加入木质素后，SBS燃烧过程的质量损失变得缓慢，木质素的填充提高了SBS弹性体的阻燃性能。