Cationic polymerization of 1, 3‐pentadiene coinitiated by zinc halides. Issue 3 (30th July 2012)

• Record Type: Journal Article
• Authors: Rozentsvet, Victor A.; Kozlov, Valery G.; Korovina, Nelly A.; Ivanova, Valentina P.; Kostjuk, Sergei V.
• Is Part Of: Journal of applied polymer science. Volume 128:Issue 3(2013:May 05)
• Page Start: 1771
• Page End: 1778
• Publication Date: 2012-07-30
• Subjects: Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.38336
• Languages: English
• ISSNs: 0021-8995

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Technology of industrial production of liquid rubber under trademark "SKOP" is based on the cationic polymerization of 1, 3‐penadiene (piperylene) in the presence of TiCl₄ or AlCl₃‐based catalytic systems. The disadvantage of these catalytic systems is the high probability of formation of branched and insoluble fractions due to the chain transfer to polymer. This deteriorates the useful qualities of SKOP. Here we propose the new initiating systems for the cationic polymerization of 1, 3‐pentadiene based on the homogeneous (dissolved in a minimal amount of diethyl ether) zinc halides (ZnCl₂ and ZnBr₂) as coinitiators and hydrochloric acid, <italic>tert</italic>‐butyl chloride or trichloroacetic acid as initiators. These initiating systems allow to synthesize fully soluble low molecular weight (<italic>M_n</italic> = 1000–3000 g mol⁻¹) poly(1, 3‐pentadiene)s with relatively narrow molecular weight distribution (<italic>M_w</italic>/<italic>M_n</italic> &lt; 2.0), which do not contain any high molecular weight and insoluble fractions in the whole range of monomer conversion. The polymers synthesized in the presence of zinc halides possess the same microstructure that those prepared with TiCl₄ as coinitiator. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013</p> </abstract>