A KINETIC-STUDY OF THE FORMATION OF POLYSTYRENE STARS USING 1,2-BIS(TRICHLOROSILYL)ETHANE

Citation
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
Citations number
19
Categorie Soggetti
Polymer Sciences
ISSN journal
08876266
Volume
35
Issue
4
Year of publication
1997
Pages
587 - 594
Database
ISI
SICI code
0887-6266(1997)35:4<587:AKOTFO>2.0.ZU;2-W
Abstract
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.