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The Effects of Gamma Irradiation on Molecular Weight, Morphology and Physical Properties of PHBV/Cloisite 30B Bionanocomposites

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Journal of Renewable Materials 2019年第9期7卷 807-820页

作者： Kahina Iggui Mustapha Kaci Mohamed Mahlous nicolas le moigne Anne Bergeret Laboratoire des Matériaux Polymères Avancés(LMPA) Universitéde Bejaia06000 BejaiaAlgeria Institut de Technologie UniversitéAkli Mohand OulhadjBouira 10000Algeria Centre de Recherche Nucléaire d'Alger(CRNA) Boulevard Frantz FanonAlger 16000Algeria Centre des Matériaux des Mines d’Alès(C2MA)a IMT Mines AlèsUniversitéde Montpellier6 avenue de Clavières30319 Alès CedexFrance.

In this paper,the effects of gamma irradiation on Cast poly(3-hydroxybutyrate-co-3-hydroxyvalerate)(PHBV)and PHBV/Cloisite 30B(C30B)(3 wt%)bionanocomposite prepared by melt compounding,were evaluated at various doses,i.e.,5,15,20,50 and 100 kGy at room temperature in *** in molecular weight,morphology and physical properties were *** study showed that the main degradation mechanism occurring in gamma irradiation in both Cast PHBV and C-PHBV/3C30B bionanocomposite is chain scission,responsible for the decrease of molecular *** scanning calorimetry(DSC)data indicated a regular decrease in crystallization temperature,melting temperature and crystallinity index for all irradiated samples with increasing the ***,DSC thermograms of both Cast PHBV and PHBV bionanocomposite exhibited double melting peaks due probably to changes in the PHBV crystal *** and DMA data showed a reduction in Young’s modulus,strength,elongation at break and storage modulus with the radiation dose;the decrease was however more pronounced for Cast *** morphological damages were much less pronounced for the PHBV bionanocomposite sample compared to Cast PHBV,for which some irregularities and defects were observed at 100 *** study highlighted the ability of C30B to counterbalance the detrimental effect of radiolytic degradation on the functional properties of PHBV up to 100 kGy,thus acting as a potential anti-rad.

关键词： Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)(PHBV) bionano-composite cloisite 30B gamma irradiation degradation

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The Effects of Accelerated Photooxidation on Molecular Weight and Thermal and Mechanical Properties of PHBV/Cloisite 30B Bionanocomposites

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Journal of Renewable Materials 2018年第3期6卷 288-298页

作者： Kahina Iggui Mustapha Kaci nicolas le moigne Anne Bergeret Centre des Matériaux des Mines d’Alès(C2MA) IMT Mines AlesUniversitéde Montpellier30100 AlèsFrance Laboratory of Advanced Polymer Materials University of BéjaïaBéjaïa Province06000Algeria Institut de Technologie UniversitéAkli Mohand OulhadjBouira 10000Algeria

The effects of accelerated photooxidation on the molecular weight and thermal and mechanical properties of Cast PHBV and PHBV/Cloisite 30B(3 wt%)bionanocomposites are investigated *** size exclusion chromatography(SEC)analysis,a significant decrease in both weight and number average molecular weights was observed for all irradiated samples over time,resulting from the chain scission *** scanning calorimetry(DSC)data indicated a decrease in degree of crystallinity and melting temperature after UV exposure,with the appearance of double melting peaks related to the changes in the crystal structure of *** stability,tensile and thermo-mechanical properties were also reduced consecutively in photooxidation,being more pronounced for Cast *** study shows that the incorporation of Cloisite 30B in PHBV provides a better resistance to photooxidation in comparison with the neat polymer.

关键词： Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) organo-modified montmorillonite bionanocomposites accelerated photooxidation and degradation

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