磨盘碾磨应力场作用下苯乙烯-丁二烯-苯乙烯嵌段共聚物的结构变化  

Structure changes of styrene-butadiene-styrene block copolymer in shear stress field produced by pan milling

作　　者：敖宁建[1] 王琪[1] 陈英红[1] 

机构地区：[1]四川大学高分子研究所高分子材料工程国家重点实验室

出　　处：《合成橡胶工业》2005年第1期17-20,共4页China Synthetic Rubber Industry

基　　金：国家重点基础研究专项基金资助项目(G1999064809);国家自然科学基金重点资助项目(50233010)

摘　　要：采用原子力显微镜法、傅里叶变换红外光谱法、透射电子显微镜法、差示扫描量热法和X光电子能谱法等研究了苯乙烯 -丁二烯 -苯乙烯嵌段共聚物 (SBS)在磨盘碾磨应力场作用下 ,其相结构和分子结构的变化。结果表明 ,磨盘形力化学反应器独特的剪切和挤压力场将SBS在室温下粉碎成5 0～ 10 0 μm的微粒 ;在碾磨过程中 ,SBS分子链断裂 ,特性黏数下降 ,聚苯乙烯分散相发生畸变 ,其相区尺寸增加 ;磨盘碾磨使SBS分子链的活性增加 ,诱使其发生交联反应 ,同时在分子链中引入含氧基团 ,可用于SBS的改性。By using atomic force microscope,Fourier-transform infrared spectroscopy,transmission electron microscope, differential scanning calorimetry , X-ray photoelectron spectroscopy and the structural changes of styrene-butadiene-styrene block copolymer (SBS) under the stress field produced by pan-milling were investigated systematically. The results showed that SBS could be pulverized to powders with diameter of 50～100 μm under the very strong shearing and squeezing stress field. During pan-milling,SBS molecular chains were ruptured, intrinsic viscosity number decreased and the aberration of dispersing phase of polystyrene increased,domain size occurred. In addition,pan-milling increased the activity of SBS molecular chain and hence could induce its crosslinking reaction. The introduction of oxygen containing groups onto SBS molecular chain also caused by pan-milling.

关 键 词：苯乙烯-丁二烯-苯乙烯嵌段共聚物 磨盘形力化学反应器 力化学 结构变化 

分 类 号：TQ334[化学工程—橡胶工业]