Functionalization of polypropylene via melt mixing

Ho, Rong‐Ming; Su, An‐Chung; Wu, Chun‐Hsien; Chen, S.I.

doi:10.1016/0032-3861(93)90400-5

Cited by 132 publications

(92 citation statements)

References 21 publications

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“…However, PP-g-MA is usually of low molar mass because the free radical grafting process is often accompanied by chain scission and some of the added compatibilizers are oligomers. [10,17,18] The grafted maleic units also lead to reduced crystallinity. At high maleic anhydride content, the miscibility between PP-g-MA and PP is also no more granted.…”

Section: Introductionmentioning

confidence: 99%

Poly(propylene)‐Layered Silicate Nanocomposites: Gas Permeation Properties and Clay Exfoliation

Osman

Mittal

Suter

2007

Macro Chemistry & Physics

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To monitor the mineral surface coverage and energy, the inorganic cations of two clays (montmorillonite) with different surface area/cation have been exchanged by alkylammonium ions, carrying alkyl chains of different number and length. The prepared OMs were free of unreacted organic ions. With increasing length and number of the alkyl chains, an increase in the basal‐plane spacing (d‐spacing) of the OM was observed. The d‐spacing also increased with increasing CEC of the clay (decreasing available area/cation). The OMs were compounded with PP and their effect on the crystallinity and gas‐barrier properties of the polymer was investigated. The OM had no influence on the degree of crystallinity of PP under the processing conditions used. Oxygen permeation through the composites decreased, depending on the cross‐sectional area of the exchanged organic cation and the CEC of the clay. These parameters control the mineral surface coverage (consequently the surface energy) as well as the tilt angle of the alkyl chains to the mineral surface, and hence the d‐spacing. Increasing the length of the alkyl chains and their number per cation enhanced the d‐spacing, clay exfoliation, and the gas‐barrier properties of the composites. A mixed morphology, consisting of delaminated aluminosilicate layers and OM tactoids of varying thickness was observed but no intercalation took place. The oxygen permeation coefficient of the nanocomposites was found to be a non‐linear function of the volume fraction of the inorganic part of the OM.magnified image

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Section: Introductionmentioning

confidence: 99%

Poly(propylene)‐Layered Silicate Nanocomposites: Gas Permeation Properties and Clay Exfoliation

Osman

Mittal

Suter

2007

Macro Chemistry & Physics

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“…A funcionalização do PP tem sido feita com sucesso por meio de reações em solução [3][4][5][6] , no estado fundido [7][8][9] e no estado sólido [10][11][12][13] . Em geral, as reações são feitas utilizando-se peróxidos, que geram radicais livres na cadeia polimérica, aos quais se adicionam moléculas polares [14] , tais como: fumarato de dietila [5] , anidrido maleico [9,15] , acetato de vinila [16] , ácido acrílico [17,18] , maleato de dietila [19,20] , anidrido itacônico [21] e isocianatos [22] .…”

Section: Palavras-chave: Funcionalização De Polipropileno Vinilsilanunclassified

Funcionalização do Polipropileno com Viniltrietoxisilano em Solução e no Estado Fundido

et al. 1998

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RESUMO: Polipropileno (PP) foi funcionalizado com viniltrietoxisilano (VTES) em solução e no estado fundido, utilizando peróxidos como iniciadores. A influência da concentração de silano e de peróxido sobre o grau de funcionalização foi avaliada por Espectrometria no Infravermelho com Transformada de Fourier (FTIR). As reações feitas no estado fundido resultaram em produtos com maior grau de funcionalização. Medidas de torque e determinações de peso molecular por Cromatografia de Permeação em Gel (GPC) demonstraram a ocorrência de reações de quebra de cadeia em todos os sistemas, porém mais acentuadamente nas reações feitas no estado fundido.

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“…The observed effects allowed to propose a reasonable mechanism, and select proper conditions for the functionalization degree (FD) and keep undesired secondary reactions under control [17,18]. In the present paper a similar study was extended to functionalization of SEBS with diethylmaleate (DEM) or MAH and dicumylperoxide (DCP) in the bulk using a Brabender mixer in order to evaluate the effect of the aromatic blocks in the process.…”

Section: Introductionmentioning

confidence: 99%

Grafting of diethyl maleate and maleic anhydride onto styrene- b -(ethylene- co -1-butene)- b -styrene triblock copolymer (SEBS)

Passaglia

Ghetti

Picchioni

et al. 2000

Polymer

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Grafting of diethyl maleate and maleic anhydride onto styrene-b-(ethylene-co-1-butene)-bstyrene triblock copolymer (SEBS) Picchioni, F.; Ghetti, S.; Passaglia, E.; Ruggeri, G. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. AbstractIn 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. ᭧

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Functionalization of polypropylene via melt mixing

Cited by 132 publications

References 21 publications

Poly(propylene)‐Layered Silicate Nanocomposites: Gas Permeation Properties and Clay Exfoliation

Poly(propylene)‐Layered Silicate Nanocomposites: Gas Permeation Properties and Clay Exfoliation

Funcionalização do Polipropileno com Viniltrietoxisilano em Solução e no Estado Fundido

Grafting of diethyl maleate and maleic anhydride onto styrene- b -(ethylene- co -1-butene)- b -styrene triblock copolymer (SEBS)

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