SIS/CNT复合材料的制备与性能

Preparation and Properties of SIS/CNT Composite

以聚苯乙烯(PS)和聚异戊二烯(PI)物质的量之比(嵌段比)分别为29/71和45/55的苯乙烯-异戊二烯-苯乙烯三嵌段共聚物(SIS)(分别记为SI-29,SI-45)为原料,以碳纳米管(CNT)为填料,通过熔融共混法制备了2种SIS/CNT复合材料(分别记为SI-29-1,SI-45-1),研究了不同嵌段比对其动态流变性能和力学性能的影响。结果表明:CNT的加入使SI-29中PS嵌段和PI嵌段的玻璃化转变温度(T_(g))均升高,SI-45中PI嵌段的T_(g)提升程度较低,而PS嵌段的T_(g)基本不变。CNT的加入使SIS的损耗模量、复数黏度以及黏流活化能均上升,其中,SI-29上升程度更明显。CNT的加入使SI-29的松弛时间明显延长,而对SI-45影响不大。此外,与SI-45-1相比,CNT的加入使SI-29-1拉伸强度的提升程度更明显。

Two types of SIS/CNT composites(SI-29-1 and SI-45-1,respectively)were prepared by melt blending method using styrene isoprene styrene triblock copolymers(SI-29 and SI-45)with a mass ratio(block ratio)of 29/71 and 45/55 for polystyrene(PS)and polyisoprene(PI)as raw materials,and carbon nanotubes(CNT)as fillers.The effects of different block ratios on their dynamic rheological properties and mechanical properties were studied.The results show that the addition of CNT increases the glass transition temperature(T_(g))of both PS blocks and PI blocks in SI-29,while has little effect on T_(g) of PS blocks and PI blocks in SI-45.The addition of CNT increases the loss modulus,complex viscosity and viscous flow activation energy of SIS,with SI-29 showing a more significant increase.The addition of CNT significantly prolongs the relaxation time of SI-29,but has little effect on SI-45.In addition,compared to SI-45-1,the addition of CNT results in a more significant improvement in the tensile strength of SI-29-1.