INVESTIGADORES
BLANCO Maria Belen
artículos
Título:
On the OH-initiated degradation of acrylic acid and selected methacrylates in the troposphere
Autor/es:
M. B. BLANCO, G. R. LUQUE, R. A. TACCONE, S. I. LANE AND M. A. TERUEL
Revista:
Proceedings of the 19th Internacional Symposium on Gas Kinetics (GK 2006)
Referencias:
Año: 2006 p. 133 - 134
Resumen:
Acrylic acid (CH2=CHC(O)OH) and methacrylates (CH2=C(CH3)C(O)OR),
where R is an alkyl group, are widely used
in the industry of polymers, paper coating, paint formulations , etc. In addition they are produced naturally by
marine algae and in the rumen fluid of sheep. The atmospheric fate
of unsaturated and oxygenated volatile
organic compounds (VOCs) is mainly their reaction with OH radicals.
As part of an ongoing program in our
laboratory to study the atmospheric chemistry of oxygenated species, we report relative
rate coefficients for the gas-phase reactions of OH radicals with acrylic acid
(k1) and three unsaturated esters: methyl methacrylate (k2),
ethyl methacrylate (k3) and n-butyl methacrylate (k4):
OH + CH2=CHC(O)OH Products, (k1) OH + CH2=C(CH3)C(O)OCH3 Products, (k2) OH + CH2=C(CH3)C(O)OCH2CH3 Products, (k3) OH + CH2=C(CH3)C(O)O
CH2CH2CH2CH3 Products. (k4)
Kinetic experiments at room
temperature and atmospheric pressure of air were performed using a
relative-rate technique with GC-FID analysis. OH radicals were produced by the
photolysis of CH3ONO in the presence of NO/O2.