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Copolymerization of two new kinds of methacrylate monomers and determination of monomer reactivity ratios
Author(s) -
Erol Ibrahim
Publication year - 2006
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.23134
Subject(s) - copolymer , polymer chemistry , monomer , methacrylate , reactivity (psychology) , gel permeation chromatography , dispersity , thermogravimetric analysis , polymer , thermal stability , mole fraction , materials science , glass transition , chemistry , organic chemistry , medicine , alternative medicine , pathology
New methacrylate monomers 2‐( p ‐methoxyphenoxy)‐2‐oxo‐ethyl methacrylate (pMPOEMA), 2‐( p ‐chlorophenoxy)‐2‐oxo‐ethyl methacrylate (pClPOEMA), and 2‐oxo‐2‐phenylamino ethylene methacrylate (PAMA) were synthesized for the first time. The free‐radical‐initiated copolymerization of pMPOEMA and pClPOEMA with PAMA was carried out in 1,4‐dioxane solution at 65°C using 2,2′‐azobisisobutyronitrile (AIBN) as an initiator with different monomer‐to‐monomer ratios in the feed. The monomers and copolymers were characterized by Fourier transform infrared, 1 H and 13 C NMR spectral studies. The copolymer compositions were evaluated from nitrogen content in polymers. The reactivity ratios of the monomers were determined by applying Fineman–Ross and Kelen–Tüdös methods. The analysis of reactivity ratios revealed that pMPOEMA and pClPOEMA are less reactive than PAMA is, and copolymers formed are statistically in nature. The molecular weights ( M w and M n ) and polydispersity index of the polymers were determined using gel permeation chromatography. Thermogravimetric analysis of the polymers reveals that the thermal stability of the copolymers increases with an increase in the mole fraction of pMPOEMA and pClPOEMA in the copolymers. Glass transition temperatures of the copolymers were found to decrease with an increase in the mole fraction of PAMA in the copolymers. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 1864–1874, 2006