Yougen Chen, Keita Fuchise, A. Narumi
Nov 9, 2011
Citations
0
Influential Citations
52
Citations
Journal
Macromolecules
Abstract
The core-first synthesis of three-, four-, and six-armed star-shaped poly(methyl methacrylate)s (PMMAs) with predicted molecular weights and narrow molecular weight distributions (Mw/Mns) was carried out by the t-Bu-P4-catalyzed group transfer polymerization (GTP) of methyl methacrylate (MMA) using the newly designed silyl enolates, such as 1,1,1-tris[2-methyl-1-(trimethylsilyloxy)prop-1-enyloxymethyl]propane (EtC(MTS)3), tetrakis{[2-methyl-1-(trimethylsilyloxy)prop-1-enyloxy]methyl}methane (C(MTS)4), and bis{2,2,2-tris[2-methyl-1-(trimethylsilyloxy)prop-1-enyloxy]ethyl}ether (O(C(MTS)3)2), respectively. The absolute molecular weight (Mw(MALS)) of the obtained polymers proportionally increased with the increasing [MMA]0/[initiator]0 ratio, and the highest molecular weight was ca. 132 kg mol–1. Characterizations for the star-shaped PMMAs were conducted by cleavage and intrinsic viscosity [η] experiments. Cleavage experiments of the star-shaped PMMAs provided the evidence for homogeneous growth of the each ...