Polynorbornene dicarboximide/amine functionalized graphene hybrids for potential oxygen barrier films

Abstract

In this work, we prepared polynorbornene dicarboximide (PND)/amine functionalized graphene (AFG) hybrids in N,N‐dimethylacetamide (DMAc). The AFG was synthesized by modifying graphene oxides (GO) with amine groups. The AFG sheets were well‐dispersed in DMAc and randomly distributed throughout the PND matrix in the hybrid films, which enhanced the mechanical and oxygen barrier properties of the PND/AFG hybrid films. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012

Crumpled reduced graphene oxide–amine–titanium dioxide nanocomposites for simultaneous carbon dioxide adsorption and photoreduction

“…In addition, two new peaks corresponding to C(O)--N (287.4 eV) and C--N (286.6 eV) 52 appear in the C 1s spectrum of pristine CGOATI (Figure 6c), which confirms the ring--opening reaction between the amine groups and epoxy groups. As shown in Figure 6(b, d), a significant decrease in intensity of oxygen--containing groups (especially hydroxyl (285.9 eV) and epoxy groups (286.5 eV) 52 ) is observed in the spectra of both CGOATI and CGOTI after photoreduction, compared to the pristine samples. This decrease indicates the simultaneous photoreduction of r--GO in the CO 2 photoreduction process.…”

“…In the N 1s XPS spectra of the CGOATI, the two peaks at ~400.8 eV and ~399.5 eV are assigned to C(O)--N and C--N(H)--C or C--NH 2 species. 52 As shown in Figure 5(b, c, d), the percentage of C--N(H)--C or C--NH 2 species decreases from 61.8% to 52.9% after CO 2 adsorption on CGOATI, but increases to 61.7% after CO 2 photoreduction, which verifies the formation of alkylammonium carbamate species due to CO 2 adsorption and the reduction of carbamate after photoreduction. The deconvoluted C 1s spectrum (Figure 6a) of pristine CGOTI shows a strong C epoxide signal (286.5 eV), 52 which decreases in intensity in the spectrum of pristine CGOATI.…”

“…52 As shown in Figure 5(b, c, d), the percentage of C--N(H)--C or C--NH 2 species decreases from 61.8% to 52.9% after CO 2 adsorption on CGOATI, but increases to 61.7% after CO 2 photoreduction, which verifies the formation of alkylammonium carbamate species due to CO 2 adsorption and the reduction of carbamate after photoreduction. The deconvoluted C 1s spectrum (Figure 6a) of pristine CGOTI shows a strong C epoxide signal (286.5 eV), 52 which decreases in intensity in the spectrum of pristine CGOATI. In addition, two new peaks corresponding to C(O)--N (287.4 eV) and C--N (286.6 eV) 52 appear in the C 1s spectrum of pristine CGOATI (Figure 6c), which confirms the ring--opening reaction between the amine groups and epoxy groups.…”

“…The deconvoluted C 1s spectrum (Figure 6a) of pristine CGOTI shows a strong C epoxide signal (286.5 eV), 52 which decreases in intensity in the spectrum of pristine CGOATI. In addition, two new peaks corresponding to C(O)--N (287.4 eV) and C--N (286.6 eV) 52 appear in the C 1s spectrum of pristine CGOATI (Figure 6c), which confirms the ring--opening reaction between the amine groups and epoxy groups. As shown in Figure 6(b, d), a significant decrease in intensity of oxygen--containing groups (especially hydroxyl (285.9 eV) and epoxy groups (286.5 eV) 52 ) is observed in the spectra of both CGOATI and CGOTI after photoreduction, compared to the pristine samples.…”

Mechanical properties and degradation studies of poly(D,L‐lactide‐co‐glycolide) 50:50/graphene oxide nanocomposite films

“…[22][23][24][25] All of the composite films showed slightly lower oxygen transmission rate (51, 48, and 47 cc/m 2 · day, for the composites containing 1, 2, and 5 wt% of GO, respectively) than that of the pristine polymer film (57 cc/m 2 · day) due to barrier properties of the GO sheets, though the difference is marginal. Further reduction in the oxygen transmission rate, which is quite necessary for practical packing uses, may be expected with further increasing GO contents due to the 3D-randomly intercalated structure of the composite film that contained high aspect ratio sheets of GO in the film as observed from EF-TEM images.…”