Effect of rubber polarity on selective wetting of carbon nanotubes in ternary blends
Effect of rubber polarity on selective wetting of carbon nanotubes in ternary blends
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DOI：
10.3144/expresspolymlett.2015.87
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发表时间：
2015-11-01
影响因子：
3.3
通讯作者：
Radusch, H-J.
中科院分区：
文献类型：
--
作者：
Le, H. H.;Parsaker, M.;Radusch, H-J.
基于原子力显微镜（AFM）和傅里叶变换红外光谱（FTIR）对橡胶-填料凝胶（润湿概念）的分析，定性和定量表征了碳纳米管（CNTs）在三元丁苯橡胶（SBR）/顺丁橡胶（BR）/天然橡胶（NR）共混物中的选择性润湿动力学。发现几乎所有的CNT被非极性NR润湿，但不被其他非极性橡胶如BR或弱极性SBR润湿。有人提出，连接到NR的α-末端的磷脂可以通过阳离子-π相互作用与CNT表面相互作用，从而在NR和CNT之间形成强键合。使用校正的NR的表面张力值，其中涉及在我们以前的工作中发现的磷脂的影响，选择性润湿的碳纳米管在三元橡胶共混物可以很好地预测使用Z-模型的热力学平衡状态。通过用极性橡胶如丁腈橡胶（NBR）代替非极性BR作为共混物组分，由于CNT与NBR的腈基之间的强相互作用，CNT被NBR润湿的程度略高于被NR润湿的程度。SBR在两种共混物中均未与CNT结合。
Based on atomic force microscopy (AFM) and Fourier transform infrared spectroscopy (FTIR) analysis of the rubber-filler gel (wetting concept) the kinetics of selective wetting of carbon nanotubes (CNTs) in ternary styrene butadiene rubber (SBR)/butadiene rubber (BR)/natural rubber (NR) blends was qualitatively and quantitatively characterized. Almost all CNTs are found to be wetted by the non-polar NR but not by the other non-polar rubber like BR or weakly polar SBR. It was proposed that phospholipids, which are linked to the alpha-terminal of NR can interact with the CNT surface through cation-pi interactions forming strong bonding between NR and CNTs. Using the corrected surface tension value of NR, which involves the effect of phospholipids found in our previous work the selective wetting of CNTs in ternary rubber blends can be well predicted using the Z-model for a thermodynamic equilibrium state. By replacing the non-polar BR by a polar rubber like nitrile butadiene rubber (NBR) as a blend component CNTs are wetted by NBR slightly more than by NR thanks to the strong interaction between CNTs and nitrile groups of NBR. SBR remains unbound to CNTs in both blends.