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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.

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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.com/id/eprint/9137

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