A study on the crystallization kinetics of PLLA in the presence of Graphene Oxide and PEG-grafted-Graphene Oxide: Effects on the nucleation and chain mobility. (1st February 2019)

• Record Type: Journal Article
• Authors: Karimi, Samira; Ghasemi, Ismaeil; Abbassi-Sourki, Foroud
• Is Part Of: Composites. Number 158(2019)
• Page Start: 302
• Page End: 310
• Publication Date: 2019-02-01
• Subjects: PLLA -- Isothermal crystallization -- Nucleation -- Graphene oxide; Composite materials -- Periodicals; Materials science -- Periodicals; Composite materials; Periodicals; Electronic journals; 620.118
• DOI: 10.1016/j.compositesb.2018.10.004
• Languages: English
• ISSNs: 1359-8368

Abstract

Abstract: The crystallization behavior of Poly(L-lactic acid) (PLLA) was studied in the presence of different nanoparticles. Two types of nanoparticles including Graphene oxide (GO) and Poly(ethylene glycol) (PEG)-grafted Graphene oxide (GO-g-PEG) were examined at various concentrations. SEM images revealed an improvement in the dispersion of nanoparticles after grafting PEG chains on the GO surface. Kinetic analysis and morphological observations indicated that GO-g-PEG has enhancing effects on the crystallization rate and nucleation ability of PLLA. This was attributed to the improved dispersion of GO-g-PEG in the PLLA matrix. The contribution of nucleation and growth steps was examined using generalized Lauritzen-Hoffman model.