Chemical and Biomolecular Engineering Faculty Research

Title

New High-throughput Approach to Measure Copolymerization Reactivity Ratios Using Real-time Ftir Monitoring

Document Type

Article

Publication Date

8-15-2004

Abstract

This paper presents a novel high-throughput approach to measure copolymerization reactivity ratios from a single experiment using high-speed real-time Fourier transform infrared (FTIR) monitoring of the isobutylene/isoprene (IB/IP) system initiated by 2-chloro-2,4,4-trimethyl-pentane (TMPCl)/TiCl4 in hexane/methyl chloride (Hx/MeCl) 60:40 v/v solvent at −80 °C. Traditional polymer analysis is severely limited in this system, which is riddled by side reactions. The reactivity ratios calculated by linear (Mayo-Lewis and Kelen-Tüdös) methods and by a nonlinear least square (NLLS) method (van Herk algorithm) showed good agreement with r1 =1.32 and r2 = 0.74 calculated using Mayr's nucleophilicity scale. Combination of the Kelen-Tüdös and NLLS methods yielded r1 = 1.17 ± 0.01 and r2 = 0.99 ± 0.02. These values agree well with those reported by Thaler et al. but disagree with most reported data. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 4084–4100, 2004

Publication Title

Journal of Polymer Science Part A: Polymer Chemistry

Volume

42

Issue

16

First Page

4084

Last Page

4100