K. Huan et al., Synthesis and properties of polydimethylsiloxane-containing block copolymers via living radical polymerization, J POL SC PC, 39(11), 2001, pp. 1833-1842
Citations number
23
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Polydimethylsiloxane (PDMS) block copolymers were synthesized by using PDMS
macroinitiators with copper-mediated living radical polymerization. Diamin
o PDMS led to initiators that gac-e ABA block copolymers, but there was low
initiator efffciency and molecular weights are somewhat uncontrolled. The
use of mono- and difunctional carbinol-hydroxyl functional initiators led t
o AB and ABA block copolymers with nar row polydispersity indices (PDIs) an
d controlled number-average molecular weights (M-n's). Polymerization with
methyl methacrylate (MMA) and X-dimethyl aminoethyl methacrylate (DMAEMA) w
as discovered with a range of molecular weights produced. Polymerizations p
roceeded with excellent first-order kinetics indicative of living polymeriz
ation. ABA block copolymers with MMA were prepared with between 28 and 84 w
t % poly(methyl methacrylate) with M-n's between 7.6 and 35 K (PDI <1.30),
which show thermal transitions characteristic of block copolymers: ABA bloc
k copolymers with DMAEMA led to amphiphilic block copolymers with M-n's bet
ween 9.5 and 4.5.7 K (PDIs of 1.25-1.70), which formed aggregates in soluti
on with a critical micelle concentration of 0.1 g dm(-3) as determined by p
yrene fluorimetry experiments. Monocarbinol functional PDMS gave AB block c
opolymers with both MMA and DMAEMA. (C) 2001 John Wiley & Sons, Inc.