Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/107447
Type: Artigo de periódico
Title: Grafting Of Diethyl Maleate And Maleic Anhydride Onto Styrene-b-(ethylene-co-l- Butene)-b-styrene Triblock Copolymer (sebs)
Author: Passaglia E.
Ghetti S.
Picchioni F.
Ruggeri G.
Abstract: In this paper a study of the bulk functionalization of styrene-b-(ethylene-co-1-butene)-b-styrene triblock copolymer (SEBS) with diethyl maleate (DEM) or maleic anhydride (MAH) and dicumyl peroxide (DCP) as initiator in a Brabender mixer is described. The determination of the functionalization degree (FD) by NMR analysis indicates that the FD values depend on the feed composition and in particular on the DEM/DCP ratio. All obtained products were fractionated by solvent extraction and characterized by IR, NMR and GPC. The results obtained show that the functionalization takes place with a very large preference at the aliphatic carbons of the polyolefin block. Moreover occurrence of degradation and chain extension reactions gives a functionalized product with a MWD larger than 1. Acetone extraction allows the isolation of styrene rich oligomers, thus the high MW functionalized polymer has a lower content of aromatic units than original SEBS. The results are described with reference to reaction mechanism previously reported in case of the functionalization under similar conditions of polymonoalkenes. (C) 2000 Elsevier Science Ltd. All rights reserved.In this paper a study of the bulk functionalization of styrene-b-(ethylene-co-1-butene)-b-styrene triblock copolymer (SEBS) with diethyl maleate (DEM) or maleic anhydride (MAH) and dicumyl peroxide (DCP) as initiator in a Brabender mixer is described. The determination of the functionalization degree (FD) by NMR analysis indicates that the FD values depend on the feed composition and in particular on the DEM/DCP ratio. All obtained products were fractionated by solvent extraction and characterized by IR, NMR and GPC. The results obtained show that the functionalization takes place with a very large preference at the aliphatic carbons of the polyolefin block. Moreover occurrence of degradation and chain extension reactions gives a functionalized product with a MWD larger than 1. Acetone extraction allows the isolation of styrene rich oligomers, thus the high MW functionalized polymer has a lower content of aromatic units than original SEBS. The results are described with reference to reaction mechanism previously reported in case of the functionalization under similar conditions of polymonoalkenes.
Editor: Elsevier Science Ltd, Exeter, United Kingdom
Rights: fechado
Identifier DOI: 10.1016/S0032-3861(99)00696-5
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-0342804450&partnerID=40&md5=a150a28854cb651f2bc3382473a1e653
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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