Polymers from pine gum components: Radical and coordination homo and copolymerization of pinenes

Ana Maria Ramos, Luís S. Lobo, João M. Bordado

Research output: Contribution to journalConference article

12 Citations (Scopus)

Abstract

The present work is aimed at studying the reactivity of α- and β-pinenes in radical polymerization. The pinene homopolymers obtained were oligomers, showing both isomers similar reactivities. In order to achieve products of higher molecular weight, the radical copolymerization of α- and β-pinene with methyl methacrylate and styrene was performed, giving rise to polymers with M̄w varying from 11 500 to 53 000. In radical copolymerization α-pinene showed to be more reactive than β-pinene. All the radical reactions performed were carried out with a Ziegler-Natta catalyst, TiCL4/Et3Al, and with Et3Al. Under the conditions tested, β-pinene did not undergo any polymerization reaction and the cocatalyst showed a pronounced catalytic effect. The coordination polymers obtained at 5 h had chain lenghts of the same order of magnitude of the corresponding radical copolymers obtained at 50 h, although for much lower overall conversion.

Original languageEnglish
Pages (from-to)43-50
Number of pages8
JournalMacromolecular Symposia
Volume127
DOIs
Publication statusPublished - 1 Jan 1998
Event10th Rolduc Polymer Meeting on Petro Polymers vs Green Polymers - Kerkrade, Netherlands
Duration: 5 May 19977 May 1997

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