We investigate the nonlinear optical limiting effect of novel graphene dispersions and graphene dispersions in carbon tetrachloride at a wavelength of 3.8μm.The transmittances of graphene dispersions in carbon tetrac...We investigate the nonlinear optical limiting effect of novel graphene dispersions and graphene dispersions in carbon tetrachloride at a wavelength of 3.8μm.The transmittances of graphene dispersions in carbon tetrachloride under two different concentrations(0.004 and 0.008 mg/mL)and two different solution thicknesses(10 and 20 mm)are measured.The influences of concentration and thickness on the optical limiting effect of graphene dispersion are analyzed.Theoretical analysis of the experimental data shows that the main optical limiting mechanism of the new graphene dispersions is Mie scattering.The limiting capacity coefficient of the new graphene dispersion in carbon tetrachloride reaches 0.405 and the minimum transmittance reaches 0.292 when the concentration is 0.004 mg/mL and the thickness is 20 mm.The graphene dispersions in carbon tetrachloride can be used to achieve good nonlinear optical limiting effects at the wavelength of 3.8μm.展开更多
To prepare GO/Polyolefin nanocomposites with enhanced mechanical, electrical, or thermal properties is still a challenge due to the poor interfacial adhesion between GO and non-polar polyolefins. In this study, we rep...To prepare GO/Polyolefin nanocomposites with enhanced mechanical, electrical, or thermal properties is still a challenge due to the poor interfacial adhesion between GO and non-polar polyolefins. In this study, we report an effective strategy for the polyolefin-functionalized graphene oxide （fGO） using two-step methods GO was firstly modified by using glycidyl methacrylate （GMA） and styrene （St） dual monomers grafting method, thus GO-g-（GMA-co-St） with numerous epoxide groups is obtained. Then through the reaction between the epoxide group of GMA and anhydride group of maleic anhydrides （MAH） of the prepared HDPE-g-（MAH-co-St）, GO-g-HDPE-g-（MAH-co-St） could be obtained. The successful prepara- tion of the GO-g-HDPE-g-（MAH-co-St） was confirmed by AFM, TEM, FTIR, XRD, DSC, and TGA characterization. The results show the grafting ratios of the poly（GMA-co-St） and HDPE-g-（MAH-co-St） being up to 50.4 wt% and 70.4 wt%, respectively. The functionalized GO shows homogeneous dispersion in the nanocomposites with HDPE, and the stress at break and strain at break of the nanocomposite is increased by 28.7% and 130% respectively with only 0.2 wt% fGO loading. The approach of the polyolefin- functionalized GO paves a new way to develop not only polyolefin/graphene nanocomposites but also excellent nanocomposites of polyolefin/engineering plastic blends with graphene.展开更多
基金supported by the National Natural Science Foundation of China(NSFC)(Nos.62175105 and 61875086)the Fundamental Research Funds for the Central Universities(No.56XBC22047)。
文摘We investigate the nonlinear optical limiting effect of novel graphene dispersions and graphene dispersions in carbon tetrachloride at a wavelength of 3.8μm.The transmittances of graphene dispersions in carbon tetrachloride under two different concentrations(0.004 and 0.008 mg/mL)and two different solution thicknesses(10 and 20 mm)are measured.The influences of concentration and thickness on the optical limiting effect of graphene dispersion are analyzed.Theoretical analysis of the experimental data shows that the main optical limiting mechanism of the new graphene dispersions is Mie scattering.The limiting capacity coefficient of the new graphene dispersion in carbon tetrachloride reaches 0.405 and the minimum transmittance reaches 0.292 when the concentration is 0.004 mg/mL and the thickness is 20 mm.The graphene dispersions in carbon tetrachloride can be used to achieve good nonlinear optical limiting effects at the wavelength of 3.8μm.
基金the financial support from the National Natural Science Foundation of China(No. 51633003)State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology(No. OIC-201601006)
文摘To prepare GO/Polyolefin nanocomposites with enhanced mechanical, electrical, or thermal properties is still a challenge due to the poor interfacial adhesion between GO and non-polar polyolefins. In this study, we report an effective strategy for the polyolefin-functionalized graphene oxide （fGO） using two-step methods GO was firstly modified by using glycidyl methacrylate （GMA） and styrene （St） dual monomers grafting method, thus GO-g-（GMA-co-St） with numerous epoxide groups is obtained. Then through the reaction between the epoxide group of GMA and anhydride group of maleic anhydrides （MAH） of the prepared HDPE-g-（MAH-co-St）, GO-g-HDPE-g-（MAH-co-St） could be obtained. The successful prepara- tion of the GO-g-HDPE-g-（MAH-co-St） was confirmed by AFM, TEM, FTIR, XRD, DSC, and TGA characterization. The results show the grafting ratios of the poly（GMA-co-St） and HDPE-g-（MAH-co-St） being up to 50.4 wt% and 70.4 wt%, respectively. The functionalized GO shows homogeneous dispersion in the nanocomposites with HDPE, and the stress at break and strain at break of the nanocomposite is increased by 28.7% and 130% respectively with only 0.2 wt% fGO loading. The approach of the polyolefin- functionalized GO paves a new way to develop not only polyolefin/graphene nanocomposites but also excellent nanocomposites of polyolefin/engineering plastic blends with graphene.
基金supported by the National Natural Science Foundation of China (52373201,52103252 and 52090033)the Fundamental Research Funds for the Central Universities (2232024Y-01)the State Key Laboratory for Modification of Chemical Fibers and Polymer Materials (Donghua University)。
