scholarly journals Preparation and modification of itaconic anhydride-methyl methacrylate copolymers

2007 ◽  
Vol 72 (12) ◽  
pp. 1507-1514 ◽  
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.

Polymerization behavior of 2,6-dimethoxystyrene

1969 ◽  
Vol 47 (11) ◽  
pp. 2057-2060 ◽  
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.

scholarly journals Reactivity Ratios of the Copolymerization Styrene/ Methyl Methacrylate Using FT-IR Spectroscopy with Comparing to Mathematically Method

2012 ◽  
Vol 9 (4) ◽  
pp. 695-702 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Methyl Methacrylate ◽  
Linearization Method ◽  
Radical Copolymerization ◽  
Copolymer Composition ◽  
Reactivity Ratios ◽  
Monomer Reactivity Ratios ◽  
Free Radical Copolymerization ◽  
Average Value ◽  
Integral Curves ◽  
Ft Ir

Free Radical Copolymerization of Styrene/ Methyl Methacrylate were prepared chemically under Nitrogen ,which was investigated, in the present of Benzoyl Peroxide as Initiator at concentration of 2 × 10-3 molar at 70 °C, which was carried out in Benzene as solvent to a certain low conversion . FT-IR spectra were used for determining of the monomer reactivity ratios ,which was obtained by employing the conventional linearization method of Fineman-Ross (F-R) and Kelen-Tüdos (K- T). The experimental results showed the average value for the Styrene r1 / Methyl Methacrylate r2 system, Sty r1 = 0.45 , MMA r2 = 0.38 in the (F–R) Method and r1 = 0.49 , r2 = 0.35 in the (K–T) Method, The Results of this indicated show the random distribution of monomers in the copolymer.Likewise The monomer reactivity ratios were evaluated Mathematically in comparison in the (F–R) Method with the data STY r1 = 0.61 , MMA r2 = 0.47 , and r1 = 0.45 , r2 =0.38 in the (K–T) Method. And were used the values r1 ,r2 for STY / MMA Copolymers in computing integral curves for the instantaneous Copolymer composition throughout the whole range of conversion.

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