Anisotropic properties of elastomeric nanocomposites based on natural rubber and sp2 carbon allotropes

eXPRESS Polymer Letters

S. Agnelli¹ 

关键词: nanocomposites;    mechanical anisotropy;    electrical anisotropy;   

DOI  :  10.3144/expresspolymlett.2018.61

学科分类：生物科学（综合）

来源: eXPRESS Polymer Letters

【 摘 要 】

This work provides a comprehensive investigation of the anisotropic mechanical and electrical properties of elastomericnanocomposites based on natural rubber and sp2 carbon allotropes. They can be either nanometric and with highshape anisotropy like Carbon Nanotubes (CNT) and lamellar nanographite, or nanostructured and nearly isometric likecarbon black. Studies were performed on calendered and compression molded plates. A complete mechanical characterizationalong all main directions could be performed by a non-standard testing approach. Composites with nanometric, high aspectratio fillers gave rise to remarkable mechanical anisotropy, revealing an orthotropic and transversally isotropic response:modulus values were very similar in the sheet plane and much larger (almost twice as much) in the orthogonal direction.The electrical anisotropy achieved its maximum at lower CNT content. Composites with carbon black did not reveal mechanicalanisotropy, while, quite strikingly, a very large electrical anisotropy was observed for carbon black content closeto the percolation threshold. These results provide insights into the anisotropic behavior of nanofilled elastomers, and couldpave the way to their exploitation in advanced engineering design and biomimicking biomedical applications.

【 授权许可】

CC BY