End-functional poly(methyl methacrylate)s via group transfer polymerization |
| |
Authors: | Rudhramyna Gnaneshwar Swaminathan Sivaram |
| |
Affiliation: | Division of Polymer Science and Engineering, National Chemical Laboratory, Pune 411 008, India |
| |
Abstract: | Hydroxyl-, amine-, and lactone-end-functional poly(methyl methacrylate)s (PMMA) were prepared with controlled molecular weights and Mw/Mn = 1.06–1.19 via group transfer polymerization. This was achieved by the electrophilic termination of silyl ketene acetal ended PMMAs with benzaldehyde, N-trimethylsilyl benzaldimine, and 5,6-dihydro-2H-pyran-2-one, respectively. The number-average degree of functionalization, as determined by NMR/SEC, was in the range of 0.70–0.85. A Lewis acid was used for terminating silyl ketene acetal ended PMMA with N-trimethylsilyl benzaldimine, whereas tetra-n-butyl ammonium bibenzoate was used in the case of benzaldehyde and 5,6-dihydro-2H-pyran-2-one. MALDI-TOF MS analysis of the end-functional polymers indicated the competing formation of cyclic end groups due to a back-biting reaction along with end-functional PMMAs. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 2514–2531, 2007 |
| |
Keywords: | α,β-unsaturated lactones back-biting degree of functionality electrophilic termination end-functional polymers functionalization GTP hydroxyl, amine-terminal polymers living anionic polymerization MALDI-TOF MS PMMA silyl ketene acetal ended poly(methyl methacrylate) |
|
|