Lee Seon Suk, Lee Dai Soo
Division of Semiconductors and Chemical Engineering, Chonbuk National University, Jeonju 561-756, Korea.
J Nanosci Nanotechnol. 2010 May;10(5):3370-4. doi: 10.1166/jnn.2010.2247.
Nanocomposites based on poly(styrene-b-(ethylene-co-butylene)-b-styrene) (SEBS) and multiwalled carbon nanotubes (MWNTs) were prepared. In order to facilitate the dispersion of MWNTs in the nanocomposites, the pristine MWNTs were reduced by Li to anions and SEBS was sulfonated. Poly(4-styrenesulfonic acid) (PSSA) was also added to either SEBS or S-SEBS and the morphology and properties of the nanocomposites were examined. Nanocomposites prepared from S-SEBS, PSSA, and the modified MWNTs showed a threshold decrease in electrical resistivity due to the percolation of MWNTs at a critical MWNT content (P(c)) lower than those for the nanocomposites based on SEBS, PSSA, and the MWNTs. It was found that the P(c) decreased with increasing the concentration of PSSA in the nanocomposites containing S-SEBS. The efficient percolation of MWNTs in the S-SEBS/PSSA nanocomposites was attributed to interactions between the ionic moieties of MWNTs and S-SEBS and the fine dispersion of the MWNTs. Nanocomposites based on S-SEBS showed large increase of rubbery plateau modulus compared with those based on SEBS. PSSA played the role of plasticizer of sulfonated PS blocks above T(g) of PS blocks in S-SEBS.
制备了基于聚（苯乙烯 - b -（乙烯 - 共 - 丁烯） - b - 苯乙烯）（SEBS）和多壁碳纳米管（MWNTs）的纳米复合材料。为了促进多壁碳纳米管在纳米复合材料中的分散，将原始的多壁碳纳米管用锂还原为阴离子并对SEBS进行磺化。还将聚（4 - 苯乙烯磺酸）（PSSA）添加到SEBS或S - SEBS中，并研究了纳米复合材料的形态和性能。由S - SEBS、PSSA和改性多壁碳纳米管制备的纳米复合材料由于多壁碳纳米管在低于基于SEBS、PSSA和多壁碳纳米管的纳米复合材料的临界多壁碳纳米管含量（P(c)）下的渗滤而表现出电阻率的阈值降低。发现P(c)随着含有S - SEBS的纳米复合材料中PSSA浓度的增加而降低。多壁碳纳米管在S - SEBS/PSSA纳米复合材料中的有效渗滤归因于多壁碳纳米管的离子部分与S - SEBS之间的相互作用以及多壁碳纳米管的良好分散。与基于SEBS的纳米复合材料相比，基于S - SEBS的纳米复合材料的橡胶态平台模量大幅增加。在S - SEBS中，高于PS嵌段的T(g)时，PSSA起到了磺化PS嵌段增塑剂的作用。
