Dj. Frater et al., A KINETIC-STUDY OF THE FORMATION OF POLYSTYRENE STARS USING 1,2-BIS(TRICHLOROSILYL)ETHANE, Journal of polymer science. Part B, Polymer physics, 35(4), 1997, pp. 587-594
The kinetics of formation of a chlorosilane-linked polystyrene six-arm
star is reported. The precursor arm material(M(n) = 88,000) was made
using anionic polymerization in benzene. Prior to addition to the 1,2-
bis (trichlorosilyl) ethane linking agent, the anions were endcapped w
ith about five units of isoprene. Size exclusion chromatography using
multiangle laser Light scattering and viscosity detectors was utilized
for characterization. This technique has allowed the molecular weight
s, radii of gyration, and intrinsic viscosities to be measured for sta
r components in aliquots taken from the reactor at various times. It w
as found that four-arm star is formed within 30 min after the addition
of the chlorosilane linking agent. There is a Linear relationship bet
ween the logarithm of molecular weight of the star samples and logarit
hm of time of the reaction after the formation of the four-arm star. (
C) 1997 John Wiley & Sons, Inc.