Chemistry Reference
In-Depth Information
Allyloxy donor monomers
Vinyloxy donor monomers
EVE
EAE
O
O
BVE
AHE
O
O
HO
HBVE
O
O
AIG
O
O
O
HVE
O
O
O
O
O
VIG
O
ACG
O
O
O
O
O
O
VCG
HO
O
AR
O
O
HO
OH
HO
O
VIR
O
HO
O
O
AIR
O
O
O
O
VTMR
O
O
O
O
O
O
ATMR
O
O
Butenedioate acceptor monomers
O
DEF
O
O
O
O
O
DEM
O
O
Scheme 7 Monofunctional donor and acceptor monomers used (EAE: Ethyl allyl
ether; AHE: Allyl hexyl ether; AIG: Allyl isopropylidene glycerol; ACG: Allyl glycerol car-
bonate; AR: Allyl-
D
-ribofuranoside; AIR: Allyl-2,3-O-isopropylidene-
D
-ribofuranoside;
ATMR: Allyl-2,3,5-tri-O-methyl-
D
-ribofuranoside; EVE: Ethyl vinyl ether; BVE: Butyl vinyl
ether; HBVE: 4-hydroxybutyl-vinyl ether; HVE: Hexyl vinyl ether; VIG: Vinyl isopropylidene
glycerol; VCG: Vinyl glycerol carbonate; VIR: Vinyl-2,3-O-isopropylidene-
D
-ribofuranoside;
VTMR: Vinyl-2,3,5-tri-O-methyl-
D
-ribofuranoside; DEF: Diethyl
fumarate; DEM: Diethyl
maleate).
O
O
OH
h
ν
OH
°
+
°
PI
Scheme 8 Photolysis of 2-hydroxy 2-methyl-1-phenylpropanone (PI).
The kinetic profiles of monomer conversion were obtained by FTIR
monitoring of the photosensitive formulations exposed in solvent-free
condition in the form of thin liquid films cast between two NaCl plates.
Under 365 nm irradiation, e
cient initiator photolysis induced the decay
of specific bands of each monomer (at 775 cm
1
of butenedioates and
815 cm
1
for vinylic double bond or 930 cm
1
for allylic unsaturation), as
shown in Fig. 1 for a blend of the vinylated ribose (VIR) and diethyl
fumarate (DEF).
Two characteristic quantities have been considered to evaluate
the reactivity in donor-acceptor copolymerization: the initial rate of
Search WWH ::
Custom Search