Počet záznamů: 1

Cellulose-based graft copolymers with controlled architecture prepared in a homogeneous phase

  1. 1.
    0364282 - UMCH-V 2012 RIV US eng J - Článek v odborném periodiku
    Raus, Vladimír - Štěpánek, M. - Uchman, M. - Šlouf, Miroslav - Látalová, Petra - Čadová, Eva - Netopilík, Miloš - Kříž, Jaroslav - Dybal, Jiří - Vlček, Petr
    Cellulose-based graft copolymers with controlled architecture prepared in a homogeneous phase.
    Journal of Polymer Science. Part A - Polymer Chemistry. Roč. 49, č. 20 (2011), s. 4353-4367 ISSN 0887-624X
    Grant CEP: GA ČR GA106/09/1348; GA ČR GAP208/10/0353
    Výzkumný záměr: CEZ:AV0Z40500505
    Klíčová slova: atom transfer radical polymerization (ATRP) * cellulose * graft copolymers
    Kód oboru RIV: JI - Kompozitní materiály
    Impakt faktor: 3.919, rok: 2011

    Cellulose-based macroinitiators with predetermined number of initiation sites were synthesized by acylation of microcrystalline cellulose AVICEL PH-101 with 2-bromoisobutyryl bromide under homogeneous reaction conditions in the DMAc/LiCl solvent system. The influence of different methods of cellulose activation on the acylation efficiency and reproducibility was investigated. A new activation protocol, based on solvent exchange to 1,4-dioxane, was introduced. Prepared macroinitiators were used for grafting with styrene and MMA using optimized ATRP reaction conditions to achieve well-controlled polymerizations with high initiation efficiency. In addition, SET LRP technique employing Cu(0) as the catalyst was used for the first time to prepare cellulose-graft-polystyrene and cellulose-graft-poly(MMA) copolymers in a homogeneous phase. Moreover, some of the prepared copolymers were characterized by static and dynamic light scattering, and microscopic techniques.
    Trvalý link: http://hdl.handle.net/11104/0006546