Amphiphilic hyperbranched polymers : synthesis, characterization and self-assembly performance / Ren Longfang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 2 (Année 2020)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 2 (Année 2020) . - 12 p. Titre : Amphiphilic hyperbranched polymers : synthesis, characterization and self-assembly performance Type de document : texte imprimé Auteurs : Ren Longfang, Auteur ; Qiaoxuan Niu, Auteur ; Jing Zhao, Auteur ; Taotao Qiang, Auteur Année de publication : 2020 Article en page(s) : 12 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Composés amphiphiles Encapsulation Polymères -- Synthèse Polymères amphiphiles Systèmes auto-assemblés Index. décimale : 668.9 Polymères Résumé : A series of amphiphilic hyperbranched polymers (AHP-s, the “s” refers to the algebra of AHP) were synthesized by the reaction between hydroxyl-terminated hyperbranched polymers (HBP-s, the “s” refers to the algebra of HBP) and palmitoyl chloride. FTIR, NMR and GPC were used to determine the structure of AHP-s, the results showed that AHP-s exhibits core-shell structure. The thermal properties of polymers were investigated by DSC and TGA. It was found that AHP-2, AHP-3 and AHP-4 display higher thermal stability than AHP-1 (AHP-1, AHP-2, AHP-3 and AHP-4 represent the first, second, third and fourth generation AHP, respectively). Furthermore, the self-assembly performance of AHP-s in THF solvent was investigated by TEM and SEM. Finally, the encapsulation capacity of the AHP-s for methyl orange (MO) was explored at different concentrations of AHP-s and pH conditions. It was found that AHP-s is capable of accommodating hydrophilic guest MO. Moreover, the higher generation of AHP-s, the stronger encapsulation capacity obtained. And the encapsulation capacity closely associated with the pH of encapsulation system. Note de contenu : - EXPERIMENTAL SECTION : Materials - Synthesis of amphiphilic hyperbranched polymers (AHP-s) - Characterization - Self-assembly experimental method in THF - Methodology for dye extraction phase transfer processes - Phase transfer experiment under different pH - RESULTS AND DISCUSSION : Characterization of amphiphilic hyperbranched polymers - Thermal properties of amphiphilic hyperbranched polymers - Self-assembly of amphiphilic hyperbranched polymers in THF - Phase transfer mechanism - Phase transfer mechanism under different pH DOI : https://doi.org/10.1186/s42825-019-0015-7 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-019-0015-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37328 [article]

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Hyperbranched polymer surfactant : synthesis, characterization and surface tension activity / Ren Longfang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 11 p. Titre : Hyperbranched polymer surfactant : synthesis, characterization and surface tension activity Type de document : texte imprimé Auteurs : Ren Longfang, Auteur ; Zheng Tang, Auteur ; Taotao Qiang, Auteur ; Guoguo Zhang, Auteur Année de publication : 2021 Article en page(s) : 11 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Chlorure d'acide gras Concentration micellaire critique Polymères ramifiés Surfactants -- Synthèse Tension superficielle Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : A series of hyperbranched polymer surfactants (HBP-C8, HBP-C12 and HBP-C16) were synthesized by the reaction between hydroxyl-terminated hyperbranched polymers (HBP) and fatty acyl chloride. The structure of obtained hyperbranched polymer surfactant was characterized by FTIR, NMR and GPC. The results showed that the products have amphiphilic structure. The thermal property of the hyperbranched polymer surfactant investigated by DSC and TGA was strongly influenced by the length of end alkyl chain. Surface activity of hyperbranched polymer surfactant was analyzed by surface tension method and UV spectrophotometry, respectively. The results showed that hyperbranched polymer surfactant took on better surface activity, which can effectively reduce the surface tension of the water. The hyperbranched polymer surfactant has a lower critical micelle concentration (CMC) and displays single molecular micellar properties, which can package small hydrophilic molecules in relatively low concentration. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of hyperbranched polymer surfactant - Testing and characterization - Surface tension activity of HBP-C - Critical micelle concentration (CMC) of HBP-C - RESULTS AND DISCUSSION : Characterization of HBP-C - Optimization of HBP-C - Grafting rate of HBP-C - Thermal properties of HBP-C - Surface tension of HBP-C - CMC of HBP-C - Table 1 The grafting rate of HBP-C - Table 2 GPC results of HBP-C DOI : https://doi.org/10.1186/s42825-020-00049-6 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-020-00049-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37473 [article]

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