Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 39, Pages 36278-36285Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b12368
Keywords
carbon nanotube; click reaction; hyperbranched polymers; strength; load transfer
Funding
- National Natural Science Foundation of China [51873233, 51573210]
- Hubei Provincial Natural Science Foundation of China [2018CFA023]
- Fundamental Research Funds for the Central Universities [CZP18001]
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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 thiolended 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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