Advanced Polybenzoxazine Structures Based on Modified Reduced Graphene Oxide

Bîru, Elena Iuliana; Gârea, Sorina Alexandra; Nicolescu, Alina; Vasile, Eugeniu; Iovu, Horia

doi:10.3390/polym10090941

Cited by 12 publications

(11 citation statements)

References 21 publications

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“…However, polybenzoxazine still has shortcomings such as being cured at higher temperature, processing difficulty, and higher brittleness [7,8,9,13]. Commonly two methodologies are employed to overcome these limitations, (i) altering the benzoxazine monomer structure by molecular design, as new functionalities can be introduced by modifying the structure of the main chain [14,15,16,17], side chain [18,19,20], or end chain structure [21,22,23,24], (ii) by adding a second component such as nano-inorganic particles [25,26,27,28], rubber elastomers [29], fiber [30], or thermoplastic polymers [31,32,33].…”

Section: Introductionmentioning

confidence: 99%

Amino-Functionalized Lead Phthalocyanine-Modified Benzoxazine Resin: Curing Kinetics, Thermal, and Mechanical Properties

Gao

Pan

et al. 2019

Polymers

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Phenol-diaminodiphenylmethane-based benzoxazine (P-ddm)/phthalocyanine copolymer was prepared by using P-ddm resin as matrix and 3,10,17,24-tetra-aminoethoxy lead phthalocyanine (APbPc) as additive. Fourier-transform infrared (FTIR), differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and thermogravimetric analysis (TGA) were used to investigate the curing behavior, curing kinetics, dynamic mechanical properties, thermal stability, and impact strength of the prepared copolymers. The kinetic parameters for the P-ddm/APbPc blend curing processes were examined by utilizing the iso-conversional, Flynn–Wall–Ozawa, and Málek methods. The P-ddm/APbPc blends exhibit two typical curing processes, and DSC results confirmed that the blending of APbPc monomer can effectively reduce the curing temperature of P-ddm resin. The autocatalytic models also described the non-isothermal curing reaction rate well, and the appropriate kinetic parameters of the curing process were obtained. The DMA and impact strength experiments proved that the blending of APbPc monomer can significantly improve the toughness and stiffness of P-ddm resin, the highest enhancements were observed on 25 wt.% addition of APbPc, the recorded values for the storage modulus and impact strength were 1003 MPa and 3.60 kJ/m2 higher, respectively, while a decline of 24.6 °C was observed in the glass transition temperature values. TGA curves indicated that the cured copolymers also exhibit excellent thermal stabilities.

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Section: Introductionmentioning

confidence: 99%

Amino-Functionalized Lead Phthalocyanine-Modified Benzoxazine Resin: Curing Kinetics, Thermal, and Mechanical Properties

Gao

Pan

et al. 2019

Polymers

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“…Figure 4 shows the FTIR spectra of raw materials (PEO, rGO-TEPA, CsA) and CsA/P, CsA/PGT1, CsA/PGT2, and CsA/PGT5 composite nanofibrous membranes. In the FTIR spectrum of rGO-TEPA, few representative peaks were identified at 1654, 1561, 1443, and 1186 cm −1 , which can be attributed to the C=C stretching vibrations from the planar structure of the GO sheet, N-H bending, C-N stretching vibrations, and C-C asymmetric stretching, respectively [41].…”

Section: Atr-ftir Resultsmentioning

confidence: 99%

Electrospun Nanofibrous Membranes Based on Citric Acid-Functionalized Chitosan Containing rGO-TEPA with Potential Application in Wound Dressings

et al. 2022

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The present research work is focused on the design and investigation of electrospun composite membranes based on citric acid-functionalized chitosan (CsA) containing reduced graphene oxide-tetraethylene pentamine (CsA/rGO-TEPA) as materials with opportune bio-properties for applications in wound dressings. The covalent functionalization of chitosan (CS) with citric acid (CA) was achieved through the EDC/NHS coupling system and was checked by 1H-NMR spectroscopy and FTIR spectrometry. The mixtures to be electrospun were formulated by adding three concentrations of rGO-TEPA into the 1/1 (w/w) CsA/poly (ethylene oxide) (PEO) solution. The effect of rGO-TEPA concentration on the morphology, wettability, thermal stability, cytocompatibility, cytotoxicity, and anti-biofilm activity of the nanofibrous membranes was extensively investigated. FTIR and Raman results confirmed the covalent and non-covalent interactions that appeared between the system’s compounds, and the exfoliation of rGO-TEPA sheets within the CsA in the presence of PEO (CsA/P) polymer matrix, respectively. SEM analysis emphasized the nanofibrous architecture of membranes and the presence of rGO-TEPA sheets entrapped into the CsA nanofiber structure. The MTT cellular viability assay showed a good cytocompatibility with the highest level of cell development and proliferation registered for the CsA/P composite nanofibrous membrane with 0.250 wt.% rGO-TEPA. The designed nanofibrous membranes could have potential applications in wound dressings, given that they showed a good anti-biofilm activity against Gram-negative Pseudomonas aeruginosa and Gram-positive Staphylococcus aureus bacterial strains.

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“…Modified reduced graphene oxide was also employed in the synthesis of advanced PBZ structures. Iovu and coworkers obtained rGO‐BZ–based polymers with exfoliated structure by using two different types of aminated reduced graphene oxide (rGO). In this study, the aminated rGO was used as a primary amine component in the Mannich condensation reaction, along with formaldehyde and phenol.…”

Section: Polybenzoxazine/carbon Materials Compositesmentioning

confidence: 99%

Developing Polybenzoxazine Composites Based on Various Carbon Structures

Bîru

Gârea

Iovu

2019

Macro Chemistry & Physics

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The synthesis of composite materials based on various carbon structures and polybenzoxazines (PBZs) gives products with noticeable thermal, electrical, and mechanical properties. The role of different carbon materials is emphasized in terms of the main advantages in both structure and properties. On the other hand, the PBZ features are significant considering the high glass transition temperatures, low flammability, high char yields, and good thermal stability. This review article describes the synthesis, structure, and properties of polybenzoxazine composites based on carbon fibers, carbon nanotubes, graphene, graphene oxide, and other carbonaceous materials. Particular attention is given to the interactions possible to occur between the polybenzoxazine matrix and carbon component.

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Advanced Polybenzoxazine Structures Based on Modified Reduced Graphene Oxide

Cited by 12 publications

References 21 publications

Amino-Functionalized Lead Phthalocyanine-Modified Benzoxazine Resin: Curing Kinetics, Thermal, and Mechanical Properties

Amino-Functionalized Lead Phthalocyanine-Modified Benzoxazine Resin: Curing Kinetics, Thermal, and Mechanical Properties

Electrospun Nanofibrous Membranes Based on Citric Acid-Functionalized Chitosan Containing rGO-TEPA with Potential Application in Wound Dressings

Developing Polybenzoxazine Composites Based on Various Carbon Structures

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