AI Article Synopsis
- Carbon nanotube (CNT) buckypapers have unique properties that make them suitable for various applications, but pristine CNT films often have low strength and modulus due to weak interactions among the nanotubes.
- Chemical modifications, like the introduction of thiol-ended hyperbranched polymers, can enhance these properties, resulting in significant increases in strength, modulus, and elongation of the films.
- The study explores how the cross-linking from the chemical modifications leads to improved mechanical performance, balancing strength and flexibility in the functionalized CNT films.
Article Abstract
Carbon nanotube (CNT) buckypapers, or films, have the potential for wide applications because of their unique properties. Neat buckypapers or pristine CNT (PCNT) films have relatively large elongation but low strength and low modulus due to the weak interaction between CNTs. Chemical modifications of PCNT films can significantly strengthen the interaction between CNTs, resulting in high strength and high modulus but usually accompanied by low elongation. Here, we report the functionalization of pristine CNT films by thiol-ended hyperbranched polymers (THBP-n) via a thiol-ene click reaction that can introduce simultaneous improvements on the strength, modulus, and elongation to the PCNT film by 689, 812, and 32.4%, respectively. The high thiol content of THBP-n enables the formation of a network with a high degree of cross-linking between carbon nanotubes, which provides high-efficiency load transfer that increases the tensile strength and modulus of the resulting films and at the same time a compressible hyperbranched structure that allows for deformation and slip between CNTs and consequently improved elongation. The main factors affecting the mechanical performance of the functionalized CNT film are also investigated.
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| http://dx.doi.org/10.1021/acsami.9b12368 | DOI Listing |
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