Properties of a new thermoplastic fluorinated polymer

Garbuglio, C.; Modena, Mario M.; Valera, Miguel Ángel; Ragazzini, M.

doi:10.1016/0014-3057(74)90056-1

Cited by 9 publications

(2 citation statements)

References 2 publications

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“…This copolymer has high melting and operation temperatures which are by 50-70C lower than that of polytetrafluoroethylene (PTFE). The alternating TFE-E copolymers possess high thermal stability in air even at 500 o C and their specific property is the high radiation resistance-1000 кGy (Garbuglio et al, 1974;Weis & Wilke, 1992;Feng & Chan, 2003;Liu et al, 2007). For the first time, the use of RHA as fillers of TFE-E copolymer was described in (Atanassov et al, 2010).…”

Section: Tetrafluoroethylene-ethylene Copolymer Compositesmentioning

confidence: 99%

Obtaining Some Polymer Composites Filled with Rice Husks Ash-A Review

Turmanova

Genieva²,

Vlaev³

2012

IJC

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Rice husks are an important by-product of rice milling process and are major waste product of the agricultural industry. Rice husk contain nearly 20 mass% silica, which is present in hydrated amorphous form. They have now become a great source as a raw biomass material for manufacturing of value-added silicon composite products, including silicon carbide, silicon nitride, silicon tetrachloride, magnesium silicide, pure silicon, zeolite, fillers of rubber and plastic composites, cement, adsorbent and support of heterogeneous catalysts. The rice husk was subjected to pyrolysis in fluidized-bed pilot plant in air or nitrogen atmosphere. The controlled thermal degradation of the rice husks in air or nitrogen leads to production of white rice husks ash (WRHA) and black rice husks ash (BRHA) respectively. WRHA contains almost pure (95mass %) silica in a hydrated amorphous form, similar to silica gel, with high porosity and reactive surface OH groups. BRHA contains different amounts of carbon and silica in amorphous form with high specific surface area and porosity. The raw rice husks and the obtained pyrolysis products were used as fillers of polypropylene (PP) and tetrafluoroethylene-ethylene copolymer (TFE-E) composites. The kinetics and thermodynamics of water adsorption onto filled polypropylene composites during soaking were studied at different temperatures, quantities and nature of fillers. It was established, that the adsorption kinetics was limited by intra-particle diffusion in plane sheet particles. The sorption process is exothermal in nature and accompanied with decrease of the entropy.The physicomechanical properties of composite materials were determined. The fillers introduced in polypropylene change the mechanical strength and make the composites brittle. This change is more pronounced for the composites with BRHA and RRH, followed by WRHA. The composites studied showed lower elongation at break. The biggest decrease was observed for the composites with BRHA where ε decrease from 500 (for the initial PP) to 7 % at filling degree of 20 mass %. The effects of the amount of adsorbed water, temperature and treatment time on the composites tensile properties were estimated. It was found after immersion in water that the composites improve their tensile strength compared to initial non-treated samples. The thermal stability and kinetics of non-isothermal degradation of PP and TFE-E composites filled with 10 or 20 mass % vigorously grounded and mixed RRH, BRHA, WRHA and Aerosil Degussa (AR) were studied. Using different calculation procedures the most probably kinetic mechanism was found to be described by kinetic equations of n -th order (F n mechanism). The kinetic parameters were obtained, and a linear dependence between ln A and E was observed, known also as kinetic compensation effect.The abundance of a waste from paddy milling industry, as well as its interesting complex of behaviors are prerequisite for success for obtaining of cheap and valuable products and gives a new alternatives for its ...

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Section: Tetrafluoroethylene-ethylene Copolymer Compositesmentioning

confidence: 99%

Obtaining Some Polymer Composites Filled with Rice Husks Ash-A Review

Turmanova

Genieva²,

Vlaev³

2012

IJC

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“…Because of its excellent thermal and chemical durability, as well as its electrical properties, ETFE is used for various industrial applications, including chemical manufacturing materials, wire coating insulation and so on. 1 This polymer film is also used as a covering sheet for sports facilities because of its excellent weatherability, transparency and mechanical strength. 2 These various properties are sensitively governed by the structure and properties of the crystal lattice and the higher-order structure, which is composed of both crystalline and amorphous regions.…”

Section: Introductionmentioning

confidence: 99%

Effect of the third monomer unit on the phase transition of oriented ethylene-tetrafluoroethylene copolymer studied by the temperature-dependent measurements of 2D X-ray scattering and polarized infrared spectroscopy

Funaki

Phongtamrug

Tashiro

2012

Polym J

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The influence of third monomer units with different chain lengths on the phase-transition behavior of the uniaxially oriented ethylene tetrafluoroethylene (ETFE)-alternating copolymer has been investigated through the use of temperature-dependent measurements of X-ray fiber diagrams, small-angle X-ray scattering patterns and polarized infrared spectra. (i) The phase transition between the low-and high-temperature phases occurs discontinuously; (ii) in the transition, the conformational disordering and radical thermal motion of the chains occur drastically as known from the increment of the half-width of the X-ray 004 reflection profile in the high-temperature region, which is associated with the trans-gauche conformational disordering; (iii) the phase-transition temperature decreases with an increase in the third monomer unit content, and the decreasing rate is overwhelmingly higher for the terpolymer with short CF 3 groups than for the terpolymer with longer C 4 F 9 groups. The CF 3 groups are included in the crystal lattice and affect the phase-transition point significantly, whereas the C 4 F 9 groups are expelled from the lattice and affect the transition behavior to a small degree; and (iv) The temperature-dependent two-dimensional small-angle X-ray scattering pattern measurements of the oriented samples revealed that the long period of the stacked lamellar structure did not change in the transition between the low-and high-temperature phases.

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Physical Properties of Alternating Copolymers

McEwen

Johnson

1985

Alternating Copolymers

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Properties of a new thermoplastic fluorinated polymer

Cited by 9 publications

References 2 publications

Obtaining Some Polymer Composites Filled with Rice Husks Ash-A Review

Obtaining Some Polymer Composites Filled with Rice Husks Ash-A Review

Effect of the third monomer unit on the phase transition of oriented ethylene-tetrafluoroethylene copolymer studied by the temperature-dependent measurements of 2D X-ray scattering and polarized infrared spectroscopy

Physical Properties of Alternating Copolymers

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