Copolymerization of 2-(4-tert-butylphenoxy)-2-oxo-ethyl Methacrylate with Methyl Methacrylate and Styrene: Synthesis, Characterization, and Monomer Reactivity Ratios

Methacrylates have high glass transition temperature (Tg) values and high thermal stability. A new methacrylate copolymer, poly(4-acetylphenyl methacrylate-co-ethyl methacrylate) (APMA-co-EMA), was synthesized. The thermal behaviors of copolymers were investigated by differential scanning calorimetry and thermogravimetric analysis. They behaved as new single polymers with singleTg’s and the thermal stability of the copolymers increased with increasing 4-acetylphenyl methacrylate (APMA) fraction, leading to the manufacture of copolymers with desiredTgvalues. Structure and composition of copolymers for a wide range of monomer feed ratios were determined by Fourier transform infrared (FT-IR) and1H-nuclear magnetic resonance (1H-NMR) spectroscopic techniques. Copolymerization reactions were continued up to 40% conversions. The monomer reactivity ratios for copolymer system were determined by the Kelen-Tüdös (ra(APMA)=0.81;rb(EMA)=0.61) and extended Kelen-Tüdös (ra=0.77;rb=0.54) methods and a nonlinear least squares (ra=0.74;rb=0.49) method.

Download Full-text

Preparation and modification of itaconic anhydride-methyl methacrylate copolymers

Journal of the Serbian Chemical Society ◽

10.2298/jsc0712507m ◽

2007 ◽

Vol 72 (12) ◽

pp. 1507-1514 ◽

Cited By ~ 8

Author(s):

Milos Milovanovic ◽

Snezana Trifunovic ◽

Lynne Katsikas ◽

Ivanka Popovic

Keyword(s):

Free Radical ◽

Methyl Methacrylate ◽

1H Nmr Spectroscopy ◽

Copolymer Composition ◽

Reactivity Ratios ◽

Complete Conversion ◽

Monomer Reactivity Ratios ◽

Itaconic Anhydride ◽

Methacrylate Copolymers ◽

Butyl Amine

The free radical copolymerisation of itaconic anhydride and methyl methacrylate in solution was studied at 60 ?C. The copolymer composition was determined by 1H-NMR spectroscopy and the obtained monomer reactivity ratios were calculated, rITA = 1.35?0.11; rMMA = 0.22?0.22 (by the Fineman-Ross method) and rITA = 1.27?0.38; rMMA = 0.10?0.05 (by the Mayo-Lewis method). The synthesised copolymers were modified by reaction with di-n-butyl amine. The copolymer composition after amidation was determined by elemental analysis via the nitrogen content. Amidation of the anhydride units in the copolymers with di-n-butyl amine resulted in complete conversion to itaconamic acid.

Download Full-text

Polymerization behavior of 2,6-dimethoxystyrene

Canadian Journal of Chemistry ◽

10.1139/v69-330 ◽

1969 ◽

Vol 47 (11) ◽

pp. 2057-2060 ◽

Cited By ~ 1

Author(s):

W. Y. Lau ◽

C. M. Burns

Keyword(s):

Molecular Structure ◽

Free Radical ◽

Methyl Methacrylate ◽

Random Copolymers ◽

Cross Linking ◽

Reactivity Ratios ◽

Monomer Reactivity Ratios ◽

Polymerization Behavior

Free radical, cationic, and anionic initiators were investigated as possible agents for the polymerization of 2,6-dimethoxystyrene. Polymerization was observed in all three cases, with rapid cross-linking apparently occurring with the cationic catalyst. Attempts at copolymerization with styrene and with methyl methacrylate resulted in the formation of homopolymers of 2,6-dimethoxystyrene, in the cationic cases, and of methyl methacrylate in the anionic cases. Random copolymers were obtained in the anionic case with styrene and in the free radical case with both comonomers. Monomer reactivity ratios were calculated, and the polymerization behavior was interpreted in terms of the molecular structure of 2,6-dimethoxystyrene.

Download Full-text