Environmentally-Friendly Acrylates-Based Polymer Latices - Advanced Materials for Agriculture, Food and Environmental Safety - page 163

[129]. h ey presented a method for determination of residual unsatura-
tions in copolymers and indicated that the ei ciency of crosslinking in
a monovinyl-divinyl copolymerization will be less than 100%. A kinetic
study of the bulk copolymerization of HEMA with EGDMA was investi-
gated by Ajzenberg and Ricard [130].
Ramelow and Pingili [131] synthesized EGDMA-MMA copolymer by
using photochemical initiator, UV radiation. Infrared spectroscopy was
used to calculate reactivity ratios and to identify the type of copolymeriza-
tion. h e reactivity ratios of EGDMA and MMA were calculated as 0.6993
and 1.8635, respectively, and it was found that as the MMA percentage in
the monomer feed increases, the percent conversion decreases.
Copolymer dispersions useful as aqueous automotive topcoats were
prepared by solution polymerization by Andre et al. [132]. Polymer of
AA-BA-HEMA-MMA was dispersed in aqueous amino-methylpropanol
and crosslinked with melamine resins to give a 23-μm-thick coating. A
paint i lm with outstanding i nished appearance, and acid, water, adhesion
and bending resistances was obtained by using a solvent-based thermoset-
ting base i nishing coat. Melamine resins were used as a crosslinker in the
above coating [133].
Hosoya et al. [134] synthesized monodispersed P(MMA-EGDMA)
packing materials by a multi-step swelling and polymerization method
with cyclohexanol or toluene as porogenic solvent. When toluene was
applied as a porogen, the seed polymer severely af ected the porous struc-
ture, while no ef ect was observed with cyclohexanols compared chro-
matographically with those prepared by the corresponding suspension
polymerization methods.
Crosslinked copolymers of acrylamide were obtained by the aqueous
suspension polymerization method by Dragan et al. [135]. In this method,
DVB and N,N-methylene-bis-acrylamide (MBAA) were used as crosslink-
ing agents and EA as a third comonomer. h e real acrylamide content in
the crosslinked copolymers was calculated taking into account the nitrogen
content at er the removal of the soluble fractions. h e water uptake depen-
dence on the copolymer structure gave information on the hydrophilicity
of these copolymers. Crosslinked copolymers of AA and EA and some ion
exchangers derived from them containing either primary amine groups
or carboxylic groups were studied by Dragan et al. [136], where DVB and
MBAA were used as crosslinkers. h e copolymers and the corresponding
ion exchangers were characterized by IR spectroscopy, swelling behavior
and thermogravimetric analysis. h e ion-exchange properties were corre-
lated with the crosslinker nature and the chemical reactions performed on
the acrylamide copolymers.