论文部分内容阅读
以苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)、玉米秸秆木质素为原料,以二氧六环为共溶剂,采用溶液浇铸的方法,制备了木质素填充的SBS弹性体膜材料。利用力学性能测试以及动态力学分析(DMA)、红外光谱分析和X射线光电子能谱(XPS)分析等方法,研究了木质素对SBS不同温度下热氧老化性能的影响。实验结果表明:在140~160℃温度范围内,老化2h后,木质素填充的SBS弹性体相比于未改性SBS拉伸强度的降幅由38.57%降至16.29%,断裂伸长率的降幅由35.96%降至8.30%;橡胶段玻璃化转变温度降幅由7.06%降至2.32%。木质素的添加有效减缓了高温热氧老化造成的SBS橡胶段玻璃化转变温度的变化以及SBS表面氧元素含量增加的幅度。木质素对SBS的填充起到了防老化的作用,提高了SBS的耐老化性能。
Using styrene-butadiene-styrene block copolymer (SBS), corn stover lignin as raw material and dioxane as co-solvent, the solution of casting was used to prepare lignin-filled SBS elastomeric film material. The effects of lignin on the thermal aging properties of SBS at different temperatures were studied by means of mechanical testing, dynamic mechanical analysis (DMA), infrared spectroscopy and X-ray photoelectron spectroscopy (XPS). The results showed that the tensile strength of SBS elastomer filled with lignin decreased from 38.57% to 16.29% at 2 h after aging at 140-160 ℃, and the elongation at break decreased From 35.96% to 8.30%; rubber segment glass transition temperature decreased from 7.06% to 2.32%. The addition of lignin effectively slowed the change of the glass transition temperature of the SBS rubber segment caused by high temperature thermal oxygen aging and the increase of oxygen element content on the surface of SBS. Filling of SBS with lignin has played a role in anti-aging, improving the anti-aging properties of SBS.