Crystallization behavior of polypropylene-graft-cardanol prepared by reactive extrusion / Q. Chen in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 1 (03/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 1 (03/2013) . - p. 43-48 Titre : Crystallization behavior of polypropylene-graft-cardanol prepared by reactive extrusion Type de document : texte imprimé Auteurs : Q. Chen, Auteur ; F. Yin, Auteur ; L. Zheng, Auteur ; X. Xiao, Auteur ; J. Lin, Auteur Année de publication : 2013 Article en page(s) : p. 43-48 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cardanol Copolymères greffés Cristallisation Extrusion réactive Nucléation Peroxyde de dicumyle Polypropylène Index. décimale : 668.4 Plastiques, vinyles Résumé : The polypropylene-graft-cardanol (CAPP) was prepared by reactive extrusion of polypropylene (PP), dicumyl peroxide (DCP) and cardanol. Differential scanning calorimeter, polarizing microscope and wide-angle X-ray diffraction were used to evaluate the effects of DCP and cardanol on the nucleation and crystallization of PP. Results indicated that DCP could work as crystallization nucleator for PP and cardanol could afford the impurity needed at the small angle kick pleat of lamellae during spherulite growth. For the effect of DCP on nucleation, it was found that the crystallization rate of PP was enhanced by 2 to 3 times by the addition of 0.2% DCP. For the effect of cardanol on spherulite growth, it was found that the growth rates of CAPP were increased from 10.9 µm · min–1 to 13.5 µm · min–1 by the addition of 5% cardanol. Due to the nucleation effect of DCP, the total crystallization rates of degraded PP initiated by DCP at the process of reactive extrusion (dPP) and of CAPP were quicker than that of PP. Attributed to the promotion by cardanol, the spherulite grew more perfectly in CAPP than in PP, so Avrami exponents of PP increased from 2.1 – 2.5 to 3.1 –3.5 by the addition of cardanol. Note de contenu : - EXPERIMENTAL : Materials - Preparation of PP-g-cardanol - Grafting ration measurements - Nonisothermal crystallization - isothermal crystallization- Spherulite growth rate measurements - X-ray diffraction analysis - RESULTS AND DISCUSSION : Effect of cardanol concentration on the nonisothermal crystallization of capps - Isothermal crystallization behavior of Capps - Spherulite growth rate - Crystalline structure analyzed by WAXD DOI : 10.3139/217.2649 En ligne : https://drive.google.com/file/d/1un9nop2sy-KrTMjvGAcjQzLZOmaJlxVH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17763 [article]

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Preparation and characterization of bamboo fibers coated with titanium urushiol and its composite materials with polypropylene / F. Yin in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 5 (11/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 5 (11/2013) . - p. 489-495 Titre : Preparation and characterization of bamboo fibers coated with titanium urushiol and its composite materials with polypropylene Type de document : texte imprimé Auteurs : F. Yin, Auteur ; J. Lin, Auteur ; X. Mao, Auteur ; Y. Deng, Auteur ; Q. Chen, Auteur Année de publication : 2013 Article en page(s) : p. 489-495 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Composites à fibres végétales Composites à fibres végétales -- Propriétés mécaniques Fibres de bambous Polypropylène Poudres Titane Index. décimale : 668.4 Plastiques, vinyles Résumé : Bamboo fibers (BFs) coated with titanium urushiol (BFTiU) was prepared by in situ reaction. Effects of activation time, urushiol concentration, reaction time and butyl titanate concentration etc on the coating ratio of BFTiU were investigated. On the other hand, the BFTiU was characterized by FTIR measurements, scanning electron microscope, thermo gravimetric analysis and differential scanning calorimetry. The results showed that titanium urushiol compound was coated on the BFs by coordination reaction and the coating ratio of BFTiU reached 35% at the optimal preparation condition. It also could be found that BFTiU possessed better heat resistant properties than BFs. Due to titanium urushiol coated on BFs, the elongation at break, the maximum deflection and the bending strength of BFTiU/PP composites were 33%, 30 % and 10% higher than those of BP/PP composites respectively. Particularly, the tensile strength of BFTiU/PP composites was better than that of BP/PP composites at the presence of 70% BFTiU. Note de contenu : - EXPERIMENTAL : Materials - Preparation of bamboo fibers (BFs) - Preparation of bamboo fibers coated with urushiol titanium compounds (BFTiU) - Preparation of BP/PP compsites and BFTiU/PP composites - CHARACTERIZATIONS : FTIR analysis - Thermogravimetric analysis - Differential scanning calorimetry - Scanning electron microscopie - Mechanical properties - RESULTS AND DISCUSSION : FTIR analysis - SEM analysis of BFs and BFTiU - Effect of ultrasonic activation time on the coating ratio of BFTiU - Effect of the concentration of urushiol on the coating ratio of BFTiU - Effect of the reaction time on the coating ratio of BFTiU - Thermal degraded process of BFs and BFTiU - Mechanical properties of BP/PP composite and BFTiU/PP - SEM analysis of BP/PP composites and BFTiU/PP composites DOI : 10.3139/217.2751 En ligne : https://drive.google.com/file/d/13hrU6rANpK8iOPWX8CE-7RIwuB6G_fC7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19895 [article]

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