Synthesis and properties of nitrogen heterocycle-functionalized core-shell hyperbranched polyester / Subramanian Karpagam in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 2 (05/2015)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 2 (05/2015) . - p. 233-242 Titre : Synthesis and properties of nitrogen heterocycle-functionalized core-shell hyperbranched polyester Type de document : texte imprimé Auteurs : Subramanian Karpagam, Auteur ; S. Guhanathan, Auteur Année de publication : 2015 Article en page(s) : p. 233-242 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale Analyse thermique Azote Calorimétrie Caractérisation Composés hétérocycliques Core-Shell Diélectriques Poids moléculaires Polyesters Polymères -- Propriétés électriques Polymères -- Propriétés thermiques Polymères -- Synthèse Polymères ramifiés Résonance magnétique nucléaire Thermogravimétrie Index. décimale : 668.4 Plastiques, vinyles Résumé : Core-shell hyperbranched polyesters (HBPE) of third generation prepared from 2,2?-bis (hydroxymethyl) propionic acid (Bis-MPA) as an ABx monomer and N-heterocyclic (indole, piperidine and piperazine) phosphoryl dichloride as a core molecule by melt condensation process. These polymers were characterized by FT-IR, 1H NMR, 13C NMR, 31P NMR, elemental analysis, and MALDI spectroscopy. The thermal behavior of the polymers has been investigated by thermo gravimetric analysis (TGA) and differential scanning calorimetry (DSC). There is no weight loss observed until 250 °C under nitrogen atmosphere. DSC showed that the glass transition temperatures was about ?14 and ?30 °C for the prepared core-shell HBPE. The dielectric properties such as dielectric constant and loss factor for these polyesters were also studied with respect to change of frequency (50 Hz to 5 MHz). Note de contenu : - EXPERIMENTAL : Materials - Methods - Measurements of dielectric properties - Synthesis of N-heterocyclic phosphoryl dichloride - Synthesis of phosphorous containing third generation (G3) of N-heterocyclic hyperbranched polyester (HBPE) - RESULTS AND DISCUSSION : Synthesis of hyperbranched polyesters - Characterization of hyperbranched polyesters - Degree of branching - Molecular weight and molecular weight distribution - Electrical properties - Thermal properties DOI : 10.3139/217.2990 En ligne : https://drive.google.com/file/d/1di8F6zbcE4a7EKMS620xoEVRSJ-DM_m2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23905 [article]

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