Staudinger Ulrike, Satapathy Bhabani K, Jehnichen Dieter
Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Str. 6, 01069 Dresden, Germany.
Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New-Delhi 110016, India.
Polymers (Basel). 2019 Nov 7;11(11):1831. doi: 10.3390/polym11111831.
A nanostructured linear triblock copolymer based on styrene and butadiene with lamellar morphology is filled with multiwalled carbon nanotubes (MWCNTs) of up to 1 wt% by melt compounding. This study deals with the dispersability of the MWCNTs within the nanostructured matrix and its consequent impact on block copolymer (BCP) morphology, deformation behavior, and the electrical conductivity of composites. By adjusting the processing parameters during melt mixing, the dispersion of the MWCNTs within the BCP matrix are optimized. In this study, the morphology and glass transition temperatures () of the hard and soft phase are not significantly influenced by the incorporation of MWCNTs. However, processing-induced orientation effects of the BCP structure are reduced by the addition of MWCNT accompanied by a decrease in lamella size. The stress-strain behavior of the triblock copolymer/MWCNT composites indicate higher Young's modulus and pronounced yield point while retaining high ductility (strain at break ~ 400%). At a MWCNT content of 1 wt%, the nanocomposites are electrically conductive, exhibiting a volume resistivity below 3 × 10 Ω·cm. Accordingly, the study offers approaches for the development of mechanically flexible functional materials while maintaining a remarkable structural property profile.
一种基于苯乙烯和丁二烯、具有层状形态的纳米结构线性三嵌段共聚物通过熔融共混填充了高达1 wt%的多壁碳纳米管（MWCNT）。本研究探讨了MWCNT在纳米结构基体中的分散性及其对嵌段共聚物（BCP）形态、变形行为和复合材料电导率的影响。通过调整熔融混合过程中的加工参数，优化了MWCNT在BCP基体中的分散。在本研究中，MWCNT的加入对硬相和软相的形态及玻璃化转变温度（）没有显著影响。然而，MWCNT的加入降低了加工诱导的BCP结构取向效应，同时伴随着片层尺寸的减小。三嵌段共聚物/MWCNT复合材料的应力-应变行为表明，其具有更高的杨氏模量和明显的屈服点，同时保持高延展性（断裂应变~400%）。当MWCNT含量为1 wt%时，纳米复合材料具有导电性，体积电阻率低于3×10Ω·cm。因此，该研究为开发机械柔性功能材料提供了方法，同时保持了显著的结构性能。
