【摘要】 将不同配比的苯乙烯-乙烯-丁二烯-苯乙烯嵌段共聚物(SEBS)/聚苯醚(PPO)通过同向双螺杆挤出机进行熔融共混。应用原子力显微镜(AFM)观察了SEBS/PPO不同配比的相态结构,并比较了其力学性能,同时还比较了不同充油量的SEBS/PPO共混物的相态结构、力学性能和流变性能。结果表明,随着PPO含量的增加,亮点聚苯乙烯(PS)段逐渐增加,PPO和PS完全融合到一起,当SEBS/PPO=80/20时乙烯-丁二烯(EB)段是连续相,PS相和PPO是分散相;当SEBS/PPO=20/80时发生相反转,PPO变为连续相;随着PPO含量的增加,拉伸强度大幅度增加,断裂伸长率明显降低;随着充油量的增加,拉伸强度和断裂伸长率均有不同程度的下降;表观黏度随非牛顿剪切速率的增加逐渐降低。更多还原

【Abstract】 SEBS/PPO blends were prepared with a twin-screw extruder,and the morphology was studied by atomic force microscope(AFM)and its mechanical properties were compared.With increasing PPO content light spot increased and the PPO and PS phase were completely miscible.When the ratio of SEBS and PPO was 80/20,EB segment was continuous phase and PS segments and PPO were dispersed phase.The hard segment structure was from dispersed phase to two continuous phase and then to continuous phase(SEBS/PPO=20/80).The tensile strength of the SEBS/PPO blends increased sharply and the elongation at break decreased with increasing PPO.Both tensile strength and elongation at break declined with increasing oil amount.更多还原