Beta-Cyclodextrin Mediated Synthesis of Syndiotactic-rich Polystyrene

Ravi, P. and Udaya Sankar, K. and Divakar, S. (2000) Beta-Cyclodextrin Mediated Synthesis of Syndiotactic-rich Polystyrene. Journal of Inclusion Phenomena and Macrocyclic Chemistry, 38. pp. 99-112.

PDF J._Inclusion_Phenom_38(1-4)_dec_2000.pdf Restricted to Registered users only Download (96kB)

Abstract

Stereoregular polystyrene (PS) was prepared using various molar equivalents of - cyclodextrin (-CD) by polymerising styrene in the presence of -CD. Stereoregular (isotactic, atactic and syndiotactic) distributions of the prepared polystyrene polymers were determined from terminal model Bernoullian statistics using 13C NMR data. Inclusion complexation of styrene by -cyclodextrin was detected by UV-Visible spectroscopy, which gave a binding constant value of 31606  3350 M−1 for the 1 : 1 complex. With an increase in the styrene : -CD ratios, the proportion of syndiotactic polymers increased. The glass transition temperature (Tg) of the polymer also increased along with melting temperature (Tm) at higher styrene : -CD ratios. In addition, the molecular weight of the polymers prepared decreased with increase in the -CD concentration.

Item Type:	Article
Uncontrolled Keywords:	Beta-CD, syndiotactic rich, 13C NMR, crystallanity, stereoregularity
Subjects:	500 Natural Sciences and Mathematics > 04 Chemistry and Allied Sciences > 27 Polymer Chemistry
Divisions:	Fermentation Technology and Bioengineering Food Packaging Technology
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	01 Jul 2009 04:43
Last Modified:	30 May 2012 11:00
URI:	http://ir.cftri.res.in/id/eprint/9137

Actions (login required)

View Item