Controlled grafting of cellulose esters using SET-LRP process

0350691 - ÚMCH 2011 RIV US eng J - Journal Article
Vlček, Petr - Raus, Vladimír - Janata, Miroslav - Kříž, Jaroslav - Sikora, Antonín
Controlled grafting of cellulose esters using SET-LRP process.
Journal of Polymer Science. Part A - Polymer Chemistry. Roč. 49, č. 1 (2011), s. 164-173. ISSN 0887-624X. E-ISSN 1099-0518
R&D Projects: GA ČR GA106/09/1348
Institutional research plan: CEZ:AV0Z40500505
Keywords : cellulose esters * copolymerization * graft copolymers
Subject RIV: JI - Composite Materials
Impact factor: 3.919, year: 2011

We present the application of SET-LRP process to a grafting of cellulose diacetate (CDA), and cellulose acetate butyrate (CAB). The macroinitiators with various functionality densities have been prepared by acylation of the backbones with 2-bromoisobutyryl (BrIB) or dichloroacetyl (DCA) groups. MMA was polymerized using DCA-functionalized macroinitiators in the presence of PMDETA as a ligand. At 30 °C, the reaction is slow, whereas the higher temperature (60 °C) speeds up the polymerization so that MMA conversion is 30% after 5 h. For BuA and t-BuA grafting, BrIB-functionalized macroinitiators are more convenient in a combination with Cu(0) and Me6TREN ligand.. Kinetic studies show “living” character of both the graftings. Important advantages of SET-LRP, compared with classic ATRP, are (i) higher polymerization rate, (ii) lower extent of recombination of the growing grafts and (iii) negligible coloration of the products with catalytic residua.
Permanent Link: http://hdl.handle.net/11104/0006144