Journal
SUSTAINABLE MATERIALS AND TECHNOLOGIES
Volume 35, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.susmat.2023.e00566
Keywords
Graphene oxide; Poly (l-lactic acid); Polyglycolic acid; Interfacial interaction
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In this study, PLLA chains were grafted onto graphene oxide (GO) to improve the interfacial interaction for PLLA/PGA scaffold. The PLLA-grafted GO reduced the interfacial tension and increased the contact surface area between PLLA and PGA, enhancing the interfacial interaction. The PLLA/PGA scaffold containing 1 wt% the PLLA-grafted GO showed significant improvement in tensile and compressive strength, and demonstrated good cytocompatibility for cell adhesion, migration, and proliferation.
The interfacial interaction between poly (l-lactic acid) (PLLA) and poly (glycolic acid) (PGA) is poor although the blending of PLLA and PGA may combine the advantages of both, which seriously affects the mechanical properties of PLLA/PGA bone scaffold. In this study, PLLA chains were grafted onto graphene oxide (GO) by ringopening polymerization reaction, and the modified GO was used as nanofiller to increase the interfacial interaction for PLLA/PGA scaffold fabricated by selective laser sintering (SLS). The result indicated that GO grafted with PLLA chains reduced the interfacial tension between GO and PLLA from 24.09 mN/m to 3.74 mN/m, thus drawing GO from PGA phase to the interface between PLLA and PGA. The GO at the interface hindered the coalescence of PGA phase through the repulsive forces and facilitated the breakup of the PGA phase, which increased the contact surface area between PLLA and PGA, and thereby enhancing the interfacial interaction. Consequently, the tensile and compressive strength of the PLLA/PGA scaffold containing 1 wt% the PLLA-grafted GO, on which L-LA ring-opening polymerized for 24 h, were increased by 44.64% and 69.65%, respectively, compared with PLLA/PGA scaffold. Besides, the cell adhesion and fluorescence experiments demonstrated that the bone scaffold had good cytocompatibility for cell adhesion, migration and proliferation.
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