Surface Functionalization of Graphene Oxide via Activators Regenerated by Electron Transfer for Atom Transfer Radical Polymerization and Its Effect on the Performance of Poly(lactic acid)

Zheng, Lang; Zhen, Weijun

doi:10.7317/pk.2018.42.4.581

Cited by 7 publications

(3 citation statements)

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“…The property of C ¼ O with a double bond led to a reduction of the absorption and shifted the functional peaks to the low wavenumber. 45 Figure 3 shows the XRD patterns of GO, PM-PV1, PM-PVGO2, PM-PVGO3, and PM-PVGO4 nanocomposites. A strong diffraction peak at 2h ¼ 11.1 is presented in the XRD spectra.…”

Section: Resultsmentioning

confidence: 99%

New fabricated PMMA-PVA/graphene oxide nanocomposites: Structure, optical properties and application

Kadhim

Al‐Bermany

2021

Journal of Composite Materials

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Graphene oxide nanosheets (GO) bring more interest in the tunable bandgap and enhanced the optical properties of nanocomposites. The developed method successfully mixed the PMMA- dissolved in dimethylformamide (DMF) with PVA dissolved in distilled water (DW) and DMF. New (PMMA-DMF)-(PVA-DW-DMF)/GO nanocomposite was successfully fabricated with various loading ratios of GO nanosheets for the first time. Several factors were applied to get fine desperation and homogeneous using the acoustic-solution casting method. Optical Microscope (OM), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and UV–visible spectrophotometer were applied to investigate the structure and optical properties of the PMMA-PVA-GO nanocomposite. The OM images confirmed the fine homogenous matrix and GO distribution in the nanocomposites. FTIR spectra exhibited the most functional group of polymers and GO in the nanocomposites and strong interfacial interaction between the GO and matrix as confirmed by the shifting in the XRD patterns of the PMMA. The optical properties results of the PMMA-PVA/GO nanocomposites revealed an improvement up to 400% of the absorbance, 337% of the absorption coefficient, 51% of the refractive index, 210% of the real and 125% of the imaginary dielectric constants in terms to increase the GO concentrations, whereas the reduction in the transmittance and energy bandgap results of allowed and forbidden indirect transition were exhibited up to 9 and 16.4%, respectively. These results could grow for better and wide applications such as radiation shielding, specific optoelectronic applications, and filters ultraviolet also could use in landfilling the chemical, nuclear, and radioactive waste.

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Section: Resultsmentioning

confidence: 99%

New fabricated PMMA-PVA/graphene oxide nanocomposites: Structure, optical properties and application

Kadhim

Al‐Bermany

2021

Journal of Composite Materials

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“…The analytic results are exhibited in Table S2, in which the impact factor of each level for the interfacial contact angle values of PGO‐PLLA was found to be 4.534, 7.870, 8.494, and 10.376, respectively. The grafting rate of PLLA onto PGO was calculated by TGA . Meanwhile, thermogravimetric data showed that the influence coefficients of the grafting rate of PGO‐PLLA were 6.507, 1.794, 3.110, and 12.484, respectively.…”

Section: Resultsmentioning

confidence: 99%

Preparation and characterization of phosphorylated graphene oxide grafted with poly(L‐lactide) and its effect on the crystallization, rheological behavior, and performance of poly (lactic acid)

Yang

Zhen

2019

Polymers for Advanced Techs

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Phosphorylated graphene oxide (PGO) was prepared by using phosphoric acid as functional reagent, and PGO was grafted with poly(L‐lactide) (PGO‐PLLA) by ring‐opening polymerization of L‐lactide as monomer under nano‐ZnO catalyst. The results of the orthogonal analysis showed the optimum reaction conditions to be as follows: the reaction temperature of 170°C, reaction time of 14 hours, the mass ratio of PGO of 10 wt%, and the mass of nano‐ZnO of 1 wt%. PGO‐PLLA was characterized by fourier transform infrared spectroscopy, gel permeation chromatography, and X‐ray photoelectron spectroscopy, which demonstrated that the PLLA molecular chains were successfully grafted onto the surface of PGO. Poly (lactic acid)/PGO‐PLLA nanocomposites (PLA/PGO‐PLLA) were prepared by melt intercalation. Mechanical test and fracture scanning electron microscopy showed that PGO‐PLLA (0.3 wt%) improved impact strength of PLA by 52.19%, which resulted in ductile fractures surface of PLA/PGO‐PLLA. Microcalorimetry and thermal degradation kinetics proved that PGO‐PLLA improved the thermal stability of PLA. Polarized optical microscopy and differential scanning calorimetry confirmed that PGO‐PLLA increased crystallization rate and spherulite kernel density of PLA, and crystallinity of PLA/PGO‐PLLA reached to 22.05%. Rheological behavior proved that PGO‐PLLA increased the self‐lubricity of PLA. Enzymatic degradation results illustrated that PGO‐PLLA had some inhibition for the biodegradability of PLA based nanocomposites.

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“…The biggest difference is that AGET-ATRP does not need to add a low-price catalyst, but introduces reducing agent (ascorbic acid) to react with oxidation state transition metal to produce the catalyst for ATRP. Zheng and Zhen [25] used AGET-ATRP polymerization to graft polymethyl methacrylate on GO and added it to PLA as a nucleating agent by melt blending to modify the PLA. The results show that the fracture elongation and impact strength of the composite have improved by 40.66% and 50.62%, respectively, due to the improved crystalline properties, and the composite has strong shielding performance against ultraviolet light.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Graphene Oxide-Polystyrene Graft Polymer Based on Reversible Addition Fragmentation Chain Transfer and Its Effect on Properties, Crystallization, and Rheological Behavior of Poly (Lactic Acid)

Yang

Zhen

2020

Advances in Polymer Technology

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Graphene oxide-polystyrene graft polymer (SGO-PS) was prepared by reversible addition-fragmentation chain transfer radical polymerization method. Orthogonal experiments indicated that the optimum synthesis reaction conditions for SGO-PS were as follows: the millimole ratio of chain transfer agent to initiator was 0.15 : 0.3, and the amount of styrene was 8 mL at 80°C for 12 hours. The products were characterized by Fourier transform infrared spectroscopy and thermal weightlessness analysis, and the highest grafting rate of SGO-PS was 62.46%. Then, PLA/SGO-PS nanocomposites were prepared using SGO-PS as fillers by melt intercalation method, and its crystallinity, mechanical properties, and thermal stability were significantly improved. Compared with pure PLA, the crystallinity of PLA/SGO-PS (0.3 wt%) nanocomposites was increased by 5 times. Multiple melting behavior tests showed that the introduction of SGO-PS caused the PLA molecular chain to be discharged into the unit cell in time, and the melting temperature shifted to a higher temperature, which ultimately made the grain structure of PLA composites more complete and stable than pure PLA. The rheological performance test showed that the uniform dispersion of SGO-PS in the PLA matrix inhibited the free movement of the PLA molecular chain and caused higher flow resistance, resulting in an increase in the complex viscosity, storage modulus, and loss modulus of PLA/SGO-PS.

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Surface Functionalization of Graphene Oxide via Activators Regenerated by Electron Transfer for Atom Transfer Radical Polymerization and Its Effect on the Performance of Poly(lactic acid)

Cited by 7 publications

References 0 publications

New fabricated PMMA-PVA/graphene oxide nanocomposites: Structure, optical properties and application

New fabricated PMMA-PVA/graphene oxide nanocomposites: Structure, optical properties and application

Preparation and characterization of phosphorylated graphene oxide grafted with poly(L‐lactide) and its effect on the crystallization, rheological behavior, and performance of poly (lactic acid)

Synthesis of Graphene Oxide-Polystyrene Graft Polymer Based on Reversible Addition Fragmentation Chain Transfer and Its Effect on Properties, Crystallization, and Rheological Behavior of Poly (Lactic Acid)

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