Effects of graphene on thermal oxidation of isotactic polypropylene

Margolin, Alexey L.; Монахова, Т. В.; Недорезова, П. М.; Klyamkina, A. N.; Polschikov, Sergey V.

doi:10.1016/j.polymdegradstab.2018.07.029

Cited by 21 publications

(13 citation statements)

References 27 publications

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“…It is known that graphite fillers may affect the thermal stability of biodegradable polyesters such as PLA, which usually inhibit thermal oxidation [ 30 ].…”

Section: Resultsmentioning

confidence: 99%

Impact of the Graphite Fillers on the Thermal Processing of Graphite/Poly(lactic acid) Composites

et al. 2021

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To assess the impact of graphite fillers on the thermal processing of graphite/poly(lactic acid) (PLA) composites, a series of the composite samples with different graphite of industrial grade as fillers was prepared by melt mixing. The average size of the graphite grains ranged between 100 µm and 6 µm. For comparative purposes, one of the carbon fillers was expandable graphite. Composites were examined by SEM, FTIR, and Raman spectroscopy. As revealed by thermogravimetric (TG) analyses, graphite filler slightly lowered the temperature of thermal decomposition of the PLA matrix. Differential scanning calorimetry (DSC) tests showed that the room temperature crystallinity of the polymer matrix is strongly affected by the graphite filler. The crystallinity of the composites determined from the second heating cycle reached values close to 50%, while these values are close to zero for the neat polymer. The addition of graphite to PLA caused a slight reduction in the oxidation induction time (OIT). The melt flow rate (MFR) of the graphite/PLA composites was lower than the original PLA due to an increase in flow resistance associated with the high crystallinity of the polymer matrix. Expandable graphite did not cause changes in the structure of the polymer matrix during thermal treatment. The crystallinity of the composite with this filler did not increase after first heating and was close to the neat PLA MFR value, which was extremely high due to the low crystallinity of the PLA matrix and delamination of the filler at elevated temperature.

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“…It is known that graphite fillers may affect the thermal stability of biodegradable polyesters such as PLA, which usually inhibit thermal oxidation [ 30 ].…”

Section: Resultsmentioning

confidence: 99%

Impact of the Graphite Fillers on the Thermal Processing of Graphite/Poly(lactic acid) Composites

et al. 2021

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“…In consequence, GO had a promising application prospect in the field of flame‐retardant epoxy resins. However, the dispersion of GO in epoxy resins and interfacial interaction between GO and EP matrix were the key factors affecting the properties of GO/EP materials 24,25 . Owing to the strong interaction between the graphene oxide refining sheet layers, agglomeration was easy to occur in the preparation of the epoxy resins modified with GO 26,27 …”

Section: Introductionmentioning

confidence: 99%

The Bi‐DOPO derivative functionalized graphene oxide: Preparation and its flame‐retardation on epoxy resin

Cui

Liu

et al. 2021

Polymers for Advanced Techs

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A novel functionalized graphene oxide (F‐GO) decorated with a double‐phosphaphenanthrene structure was fabricated using a covalent modification method. The F‐GO with Bi‐DOPO groups then was introduced into the epoxy matrix as a highly effective flame retardant. The Flame retardant epoxy resins (FREP) containing F‐GO exhibited superior fire‐resistant performance with extremely low loading. When the content of F‐GO was 1 wt%, the limiting oxygen index value of the FREP was increased from 19.9% to 30.8%, and the total heat release and the peak heat release rate was decreased by 44.0% and 55.5%, respectively. Meanwhile, the tensile and impact tests results indicated that the mechanical properties of the epoxy resins were improved with the addition of F‐GO. Furthermore, the thermogravimetric analysis showed that F‐GO greatly increased the char‐yield of the cured FREP. Based on the char analyses of SEM images, F‐GO was conducive to form a more protective char barrier for FREP during combustion. F‐GO developed a synergistic flame‐retardant effect of the Bi‐DOPO derivative and graphene layer structures on epoxy resins.

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“…5,6 There is now a family of graphene-related materials, such as pristine graphene, [7][8][9][10][11][12] graphene oxide, [13][14][15][16][17][18] reduced graphene oxide, [19][20][21] and graphene nanoplatelets (GNPs). [22][23][24][25] Typically, GNPs are much cheaper than other forms of graphene and are commercially available on the tonne scale. 26 The effects of filler orientation on the conductivity of the composite have been extensively studied recently, and anisotropic electrical properties have been reported.…”

Section: Introductionmentioning

confidence: 99%

“…It has an exciting combination of properties, especially its superb electrical conductivity (up to 10 8 S m −1 ) 5,6 . There is now a family of graphene‐related materials, such as pristine graphene, 7–12 graphene oxide, 13–18 reduced graphene oxide, 19–21 and graphene nanoplatelets (GNPs) 22–25 . Typically, GNPs are much cheaper than other forms of graphene and are commercially available on the tonne scale 26 …”

Section: Introductionmentioning

confidence: 99%

Examining the contribution of factors affecting the electrical behavior of poly(methyl methacrylate)/graphene nanoplatelets composites

Luo

Schubert

2021

J of Applied Polymer Sci

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In this study, poly(methyl methacrylate) (PMMA)/graphene nanoplatelets (GNPs) conductive composite films with different morphologies were fabricated from the same constituent materials using four fabrication techniques, solution casting (SC), SC followed by hot pressing (SCP), melt mixing followed by SC (MSC), and melt mixing followed by hot pressing (MP). Morphologies of dispersed GNPs and electrical properties in both in-plane and perpendicular direction were investigated and compared systematically. The corresponding percolation thresholds (Φ c ) of the composites varied from 0.42 ± 0.13 vol% to 3.26 ± 0.48 vol%. The conductivities varied up to two orders of magnitude and decreased in the sequence of SC > MSC > SCP > MP. These variations were explained in terms of GNPs size, GNPs orientation, distribution and dispersion state of fillers. The contribution of the above factors in each procedure were discerned individually, the results were discussed and compared with other experimental studies and simulations as well.

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Effects of graphene on thermal oxidation of isotactic polypropylene

Cited by 21 publications

References 27 publications

Impact of the Graphite Fillers on the Thermal Processing of Graphite/Poly(lactic acid) Composites

Impact of the Graphite Fillers on the Thermal Processing of Graphite/Poly(lactic acid) Composites

The Bi‐DOPO derivative functionalized graphene oxide: Preparation and its flame‐retardation on epoxy resin

Examining the contribution of factors affecting the electrical behavior of poly(methyl methacrylate)/graphene nanoplatelets composites

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