A study on thermal and electrical conductivities of ethylene-butene copolymer composites with carbon fibers / Y. Hamid in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 4 (2021)

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 4 (2021) . - p. 417-422 Titre : A study on thermal and electrical conductivities of ethylene-butene copolymer composites with carbon fibers Type de document : texte imprimé Auteurs : Y. Hamid, Auteur ; P. Svoboda, Auteur Année de publication : 2021 Article en page(s) : p. 417-422 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Composites à fibres de carbone Conduction électrique Copolymère butène éthylène Thermocinétique Index. décimale : 668.4 Plastiques, vinyles Résumé : Ethylene-butene copolymer (EBC)/carbon-fiber (CF) composites can be utilized as an electromechanical material due to their ability to change electric resistance with mechanical strain. The electro-mechanical properties and thermal conductivity of ethylene butene copolymer (EBC) composites with carbon fibers were studied. Carbon fibers were introduced to EBC with various concentrations (5 to 25 wt%). The results showed that carbon fibers’ addition to EBC improves the electric conductivity up to 10 times. Increasing the load up to 2.9 MPa will raise the electric resistance change by 4 500% for a 25% fiber sample. It is also noted that the EBC/CF composites’ electric resistance underwent a dramatic increase in raising the strain. For example, the resistance change was around 13 times higher at 15% strain compared to 5% strain. The thermal conductivity tests showed that the addition of carbon fibers increases the thermal conductivity by 40%, from 0.19 to 0.27 Wm–1K–1. Note de contenu : - Experimental : Materials - Characterization - Results and Discussion : Electrical properties - Thermal conductivity - Table 1 : The thermal conductivity parameters of EBC/CF DOI : https://doi.org/10.1515/ipp-2020-4003 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36715 [article]

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The three-phase structure of random butene-1/ethylene copolymers / M. L. Di Lorenzo in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 5 (11/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 5 (11/2016) . - p. 647-654 Titre : The three-phase structure of random butene-1/ethylene copolymers Type de document : texte imprimé Auteurs : M. L. Di Lorenzo, Auteur ; R. Androsch, Auteur ; I. Stolte, Auteur ; M. C. Righetti, Auteur Année de publication : 2016 Article en page(s) : p. 647-654 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Copolymère butène éthylène Cristallisation Matériaux amorphes Polybutylène Polymères isotactiques Index. décimale : 668.4 Plastiques, vinyles Résumé : The three-phase arrangement of random copolymers of butene-1 with ethylene was investigated and compared with isotactic poly(butene-1) homopolymer (iPB-1). In all the analyzed compositions, isothermal crystallization leads to a three-phase structure, made of one crystal phase and two amorphous fractions that differ in mobility: the mobile amorphous fraction (MAF), made of the polymer chains that relax at the glass transition, and a rigid amorphous fraction (RAF) made of the amorphous segments coupled with the crystal phase. Copolymerization with ethylene leads to a drop in crystal fraction and to a sizable increase of both the RAF, and of the specific RAF, i.e. of the RAF normalized to crystallinity. Analysis of crystal growth rate allowed quantifying the fold surface free energy, which increases of about 50 to 100% in the copolymers, compared to iPB-1 homopolymer. In the butene-1/ethylene random copolymers, ethylene units are mostly excluded from the crystals and accumulate at the crystal/amorphous interphase, thus affecting the rigid amorphous area. The varied composition and higher mobility of the rigid amorphous fraction of the copolymers affects also the Form II to Form I transformation of poly(butene-1) crystals, which occurs with enhanced kinetics in the copolymers, compared to iPB-1 homopolymer. DOI : 10.3139/217.3248 En ligne : https://drive.google.com/file/d/1ugwi9hEo1yiLYHohNhCYW1Scdre9tO_-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27405 [article]

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