Controllability of radical copolymerization of maleimide and ethyl alpha-(n-propyl)acrylate using 1,1,2,2-tetraphenyl-1,2-bis(trimethylsilyloxy) ethane as initiator
Lj. Shi et al., Controllability of radical copolymerization of maleimide and ethyl alpha-(n-propyl)acrylate using 1,1,2,2-tetraphenyl-1,2-bis(trimethylsilyloxy) ethane as initiator, J POL SC PC, 38(16), 2000, pp. 2872-2878
Citations number
18
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
The radical copolymerization of maleimide (MI) and ethyl alpha-propylacryla
te was performed using 1,1,2,2-tetraphenyl-1,2-bis(trimethylsilyloxy) ethan
e (TPSE) as initiator. The whole copolymerization process might be divided
into two stages: in the first stage, the copolymerization was carried out o
n the common radical mechanism, the molecular weight of the copolymer incre
ased rapidly in much lower conversion (< 85%), and did not depend on the po
lymerization time and conversion; in the second stags, molecular weight of
the copolymer increased linearly with the conversion and the polymerization
time. It was found, however, when the conversion was higher than a certain
value, for example, more than 36%, the molecular weight of the copolymer w
as nearly unchangeable with the polymerization time and the molecular weigh
t distribution was widened. The effect of reaction conditions on copolymeri
zation was discussed and the reactivity ratios were calculated by the Kelen
-Tudos method, the values were r(MI) = 0.13 +/- 0.03, r(EPA) = 0.58 +/- 0.0
6 for TPSE system and r(MI) = 0.12 +/- 0.03, r(EPA) = 0.52 +/- 0.06 for AIB
N system. (C) 2000 John Wiley & Sons, Inc.