Polyaniline as an antioxidant and antirad in SBR vulcanizates

Ismail, M. N.; Ibrahim, Mervat S.; El‐Ghaffar, M. A. Abd

doi:10.1016/s0141-3910(98)00016-0

Cited by 39 publications

(23 citation statements)

References 3 publications

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“…Note that T dec increased over 60°C at 30 wt% PAn‐ g ‐SGF, relative to the neat iPP. Indeed, the stabilizer properties of polyaniline against oxidative degradation have been previously noted by Ismail et al [30] in rubbers. Chemically, polyaniline structure contains secondary amine groups, which are between two aromatic groups and might behave as hindered amines scavenging free radicals that start the polymer degradation [31].…”

Section: Resultsmentioning

confidence: 75%

Electrically conducting polypropylene/polyaniline‐grafted‐short glass fiber composites: Microstructure and dynamic mechanical analysis

Valerio-Cárdenas¹,

Romo-Uribe²,

Cruz-Silva³

2010

Polymer Engineering & Sci

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The thermal properties of isotactic polypropylene (iPP) reinforced with polyaniline‐grafted‐short glass fibers (PAn‐g‐SGF) at 10, 20, and 30 wt% concentration and iPP blended with 5 wt% PP‐grafted‐maleic anhydride (PP‐gMA) and 30 wt% of PAn‐g‐SGF were investigated. iPP crystallizes into a spherulitic morphology, the microfiller promoted larger spherulite size and higher dynamic modulus, but the overall degree of crystallinity decreased as the concentration of PAn‐g‐SGF increased. The melting temperature, Tm, was not influenced by the microfiller. However, the crystallization temperature, Tc, as determined by DMA, first decreased reaching a minimum at ca. 20 wt%, and then increased, in contrast with Tc determined by DSC, it increased as concentration increased. The initial reduction in Tc observed by DMA seems to be associated with the crystallites growing from the microfiller into the matrix, the overall molecular dynamics then being less affected. On the other hand, increase in Tc above 20 wt% concentration suggests that the percolation threshold could be responsible for these results. Addition of the maleic anhydride copolymer produced higher shear modulus, transition temperatures, and activation energy, suggesting higher interaction between microfiller and polymer matrix. POLYM. ENG. SCI., 2011. © 2010 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 75%

Electrically conducting polypropylene/polyaniline‐grafted‐short glass fiber composites: Microstructure and dynamic mechanical analysis

Valerio-Cárdenas¹,

Romo-Uribe²,

Cruz-Silva³

2010

Polymer Engineering & Sci

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“…Upon exposure to radiation, high-molecular weight PTFE degrades to low-molecular weight PTFE. It is reported in the literature that the radiation resistance of polymer materials can be improved appreciably when aluminum flakes, radical stabilizers, ceramic fiber, inorganic fillers, etc., are added to the polymer matrix (Ref [6][7][8][9][10][11]. Among the various methods available for improving the radiation resistance of a polymer, blending the polymer with a filler material is the simplest process.…”

Section: Introductionmentioning

confidence: 99%

Radiation Degradation of Polytetrafluoroethylene-Lead Composites

Karmakar

Lawrence

Mallika

et al. 2015

J. of Materi Eng and Perform

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Composites of polytetrafluoroethylene (PTFE) with Pb (0-15 wt.%) were fabricated and irradiated up to 50 kGy in a 60 Co-gamma chamber to evaluate the effect of Pb in improving the radiation tolerance of PTFE. Thermal and mechanical properties were measured for the irradiated and un-irradiated PTFE samples and its composites. The number average molecular weight of PTFE was estimated at different doses from the enthalpy of crystallization values obtained by Differential Scanning Calorimetry. Reduction in the percentage increase in the enthalpy of crystallization and melting of PTFE-15% Pb composite, during irradiation indicated the stabilizing effect of lead on PTFE. Surface morphology of PTFE and its composites revealed that the formation of micro-cracks and blisters in PTFE, owing to radiation damage was controlled by lead. Elongation at break values and SEM images of the irradiated composites indicated that 15% Pb offered better stability to PTFE than 10% Pb.

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“…Although the abrasive resistance, heat-resistant quality and aging-resistant performance of SBR are better than those of natural rubber, the double bonds and allyl-hydrogen groups on SBR molecular chains make rubber aging more likely in thermal or humid conditions. 3,4 In addition, as the poor dispersity of silica in rubber matrix resulting from the high surface energy of silica severely degrades the rubber performance, it's necessary to change the surface polarity of silica from hydrophilicity to lipophilicity via surface modication, which can improve the dispersity and reinforcement performance of silica in rubber matrix. The tensile strength of vulcanized SBR is only about 3 MPa, resulting in the need for SBR to be reinforced before use.…”

Section: Introductionmentioning

confidence: 99%

Effect of nanosilica-based immobile antioxidant on thermal oxidative degradation of SBR

et al. 2015

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A new kind of nanosilica-based immobile antioxidant (RT-silica) consisting of nanosilica, antioxidant intermediate p-aminodiphenylamine (RT) and silane coupling agent 3-glycidoxypropyltrimethoxysilane (KH-560) was successfully synthesized via a grafting reaction in our laboratory. It was revealed that the anti-oxidation performance of the SBR/RT-silica composite was far superior to that of the SBR/silica composite, especially at high temperature, based on the results of non-isothermal oxidation induction time (OIT) tests. The calculation of protection factors (PFs) based on two non-Arrhenius temperature functions showed that silica possessed an acceleration effect on the aging of the SBR matrix. According to the results of tensile tests, the SBR/RT-silica composites exhibited more preeminent mechanical properties and residual rates during accelerated aging, in comparison with the SBR/silica composites. The affections of RT-silica on the cross-linking network of the SBR matrix were investigated via a tube model, demonstrating that RT-silica can't change the cross-linking density, but can induce the chain entanglement of rubber molecular chains. Moreover, the calculated values of degradation activation energy of SBR composites via the Kissinger-Akahira-Sunose (KAS) method and Friedman method showed that RT-silica changed the thermal-oxidative aging mechanism of the SBR matrix.

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Polyaniline as an antioxidant and antirad in SBR vulcanizates

Cited by 39 publications

References 3 publications

Electrically conducting polypropylene/polyaniline‐grafted‐short glass fiber composites: Microstructure and dynamic mechanical analysis

Electrically conducting polypropylene/polyaniline‐grafted‐short glass fiber composites: Microstructure and dynamic mechanical analysis

Radiation Degradation of Polytetrafluoroethylene-Lead Composites

Effect of nanosilica-based immobile antioxidant on thermal oxidative degradation of SBR

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