Nondestructive Functionalization of Graphene by Surface-Initiated Atom Transfer Radical Polymerization: An Ideal Nanofiller for Poly(p‑phenylene benzobisoxazole) Fibers

• Published in: Macromolecules Vol. 50; no. 4; pp. 1422 - 1429
• Main Authors: Hu, Zhen, Shao, Qing, Moloney, Mark G, Xu, Xirong, Zhang, Dayu, Li, Jun, Zhang, Chunhua, Huang, Yudong
• Format: Journal Article
• Language: English
• Published: American Chemical Society 28.02.2017
• ISSN: 0024-9297; 1520-5835
• DOI: 10.1021/acs.macromol.6b02694

A direct and nondestructive strategy for growing polymers from the surface of graphene is demonstrated. The technique involves the covalent attachment of an initiator via one-step cycloaddition of a diarylcarbene, followed by the polymerization of 2-hydroxyethyl methacrylate (HEMA) using atom transfer radical polymerization (ATRP). The functionalization strategy is shown to significantly increase the solubility of the resulting materials (PHEMA-G) and leave the structure of the graphene largely intact. Importantly, the PHEMA-G/poly­(p-phenylene benzobisoxazole) (PBO) composite fibers could be obtained by a one-pot polymerization and dry-jet wet spinning process. The nanocomposite fibers exhibited a tensile strength of 3.22 GPa (51.2% higher than PBO) and Young’s modulus of 139.3 GPa (33.7% higher than PBO) at very low PHEMA-G loading (1.0 wt %). This represents an excellent reinforcing efficiency, better than other reports of the graphene/PBO fibers system, and indicates that this material is suitable for applications in composite science.