Kinetics of thermal degradation and estimation of lifetime for polypropylene particles: Effects of particle size

Paik, Pradip; Kar, Kamal K.

doi:10.1016/j.polymdegradstab.2007.11.001

Cited by 117 publications

(42 citation statements)

References 41 publications

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“…The cables are supposed to be used at NPPs without failure for 30-40 years at temperatures up to 80 o C. At these temperatures, the plasticizers loss is due to their migration from bulk to surface and due to their evaporation. The cable becomes brittle and the glass transition temperature T g , increases (Beneš,et al, 2005;Paik et al, 2008).…”

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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“…This suggests that the enhancement of thermal stability for polymer in situ composite strongly depends on the inherent nature of the blend components; that is, the improved thermal stability of the final in situ composite is not only contributed from the TLCP dispersed phase but also the inherent characteristics of the matrix. In addition, Paik and Kar (2008) have studied the effect of particle size on kinetics of thermal degradation for PP. They found that with change in particle size of PP, thermal degradation and diffusion mechanism of degradation products are different even at constant heating rate.…”

Section: Scheme 2 -Thermal Degradation Mechanism Of Pp (Peterson Et Amentioning

confidence: 99%

Thermal decomposition kinetics of in situ reinforcing composite based on polypropylene and liquid crystalline polymer

Saikrasun

Saengsuwan

2009

Journal of Materials Processing Technology

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“…Paik et al [13] showed that single and multiple heating rate methods lead to almost same activation energy values which was in good agreement with each other. The data obtained in this study was analyzed using Brodio single heating-rate technique.…”

Section: Introductionmentioning

confidence: 58%

Influence of Plastic Type and Compatibilizer on Thermal Properties of Wheat Straw Flour/Thermoplastic Composites

Zabihzadeh

2010

Journal of Thermoplastic Composite Materials

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The thermal stability and the thermal expansion of wheat straw flour filled polypropylene and high density polyethylene composites were studied using thermogravimetric analysis and thermomechanical analysis. The results of this study showed that the thermal degradation and the thermal expansion of the composites were affected by plastic type and compatibilizer. The thermal stability of HDPEbased composites was found to be higher than that of PP-based ones. Adding compatibilizer to the composites boosted the thermal stability of agro-filler thermoplastic composites by improving the adhesion between wheat straw flour and the matrices. The thermal degradation activation energy of pure PP and HDPE was higher than that of the composites. The activation energy of compatibilized composites was slightly higher than uncompatibilized ones. TMA results indicated that wheat straw flour was a suitable material for decreasing the thermal expansion of the composites caused by cold and warm atmospheric changes. The thermal expansion of PP and wheat straw flour filled polypropylene composites was found to be lower than that of HDPE and HDPE-based composites.

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Kinetics of thermal degradation and estimation of lifetime for polypropylene particles: Effects of particle size

Cited by 117 publications

References 41 publications

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

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

Thermal decomposition kinetics of in situ reinforcing composite based on polypropylene and liquid crystalline polymer

Influence of Plastic Type and Compatibilizer on Thermal Properties of Wheat Straw Flour/Thermoplastic Composites

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