Modification of styrene-isoprene block copolymers—3. Addition of maleic anhydride—mechanism

Mitov, Z.; Velichkova, R.

doi:10.1016/0014-3057(93)90023-9

Cited by 30 publications

(12 citation statements)

References 6 publications

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“…However, it is an attractive reagent for modification of hydrophilicity of nonpolar polymers as it is difficult to homopolymerize, therefore normally only one monomer unit is grafted on each generated radical active site. In the case of polydienes such as NR, styrene–isoprene (SI), and styrene–butadiene–styrene (SBS) block copolymers, the grafting process can be done through two different mechanisms, i.e., radical‐ inducing grafting and thermal grafting via an ene mechanism 14–19. For the ene mechanism, high temperature (160–240°C) is required for the fixation of MA to polydiene backbone.…”

Section: Introductionmentioning

confidence: 99%

Influence of styrene on grafting efficiency of maleic anhydride onto natural rubber

Saelao

Phinyocheep

2004

J of Applied Polymer Sci

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Grafting of maleic anhydride (MA) onto natural rubber (NR) has been investigated by using a radical initiated grafting process. NR was masticated to lower molecular weight than the original NR before treatment with 0.5-1.5% by mole of benzoyl peroxide (BPO) and 5-25% by mole of MA in toluene solution. Fourier transform infrared spectroscopy (FTIR) and titration method were used to analyze the fixation of MA on the NR. The reaction temperature was varied from 60 to 80°C. The % grafting of MA was higher at higher temperatures. Compared to the reaction without styrene, the addition of 0.1% by mole of styrene in the grafting process increased % MA grafting up to two times. It is postulated that the styrene may act as a charge transfer complex for the reaction of NR with MA. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 95: 28 -38, 2005

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Section: Introductionmentioning

confidence: 99%

Influence of styrene on grafting efficiency of maleic anhydride onto natural rubber

Saelao

Phinyocheep

2004

J of Applied Polymer Sci

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“…Grafting of MA or other polar monomers onto NR backbone improves the compatibility between NR and other polar elastomers and some engineering plastics such as polyamide. According to several authors [53][54][55][56][57][58][59], the grafting process of MA onto polydienes, such as NR, styrene-isoprene, and styrene-butadiene-styrene block copolymer, involves two different mechanisms, i.e., radical-induced grafting and thermal grafting via an ene mechanism. For the ene mechanism, high temperature (160-240°C) is required for the fixation of MA to polydiene backbone.…”

Section: Recent Progress In Rubber-organoclay Nanocompositesmentioning

confidence: 99%

Preparation and Characterization of Thermoplastic Elastomers/Plasticizer - Compatibilizer/Organoclay Nanocomposites by Reactive Extrusion System

Ad¹,

Mor²,

Erdoğan³

2017

Chem Sci J

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Polymer layered silicate nano-composites were prepared in melt by reactive extrusion (25:1 21 mm Rondol twinscrew compounding line) using poly(ethylene-co-propylene-co-ethylidenenorbornene) terpolymer (EPDM) as a matrx polymer, PP-g-MA and poly[(maleic anhydride-alt-1-octadecene)-g-PEO (poly(MA-alt-OD)-g-PEO) as functionalized polymer compatibilizer-internal plasticizer, octadecyl amine-montmorillonite (ODA-MMT) and dimethyldidodecyl ammonium -MMT (DMDA-MMT) as reactive and non-reactive nano-fillers, respectively. The formation of nano structural fragments, polymer blend composition-properties (thermal behavior and morphology) was studied using FTIR, XRD, TGA-DTG and DSC analysis methods. It was found that intercalation/exfoliation degree of EPDM macromolecules significantly depends on the origin and content of organoclays. Better results were obtained for nanocomposites prepared in the presence of reactive organo-filler (ODA-MMT) and PEO grafted alternating copolymer. The results of FTIR (chemical structure) and XRD (physical structure and exfoliation degree) analyses indicate that amidization of anhydride copolymer with alkyl amine groups of organo-filler and esterification of alternating copolymer with α -hydroxy-ω -methoxy-PEO occur in melt compounding in situ processing in the chosen extrusion conditions (barrel temperature: 120, 130, 140 and 145°C, twin-screw speed around 30-40 mrp). The glass-transition (Tg), melting (Tm) and recrystallization (Tc) temperatures strongly depend on the origin and content of organoclay and PEO-grafted copolymer-compatibilizer, respectively. Thermal behavior, crystallinity and thermostability of nanocomposites were significantly improved as compared with pristine EPDM terpolymer.

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“…MAH has been grafted onto SEBS, 8,9 poly-cisbutadiene, 10 styrene-isoprene block copolymers, 1 EPDM, 4,6,11 EPR, 2,12 and others. Gaylord et al 2 studied the grafting of MAH onto EPR rubber in the melt in the presence of high MAH concentrations, using a Brabender mixer.…”

Section: Introductionmentioning

confidence: 99%

“…The MAH grafting reaction can be conducted in polymer solution [1][2][3] or in the melt state. 4 -6 For the grafting of MAH a number of reactions have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Bulk modification of styrene–butadiene–styrene triblock copolymer with maleic anhydride

Wilhelm

Felisberti

2002

J of Applied Polymer Sci

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ABSTRACT:The bulk modification of SBS rubber with maleic anhydride in a mixing chamber of a Haake rheomixer was studied. The effect of temperature, maleic anhydride, and benzoyl peroxide concentrations on the grafting efficiency was evaluated. High grafting efficiency was achieved when the ratio of peroxide and maleic anhydride concentration was high. On the other hand, on this condition high insoluble fraction was generated. The addition of a diamine, 4,4Ј-diaminediphenylmethane to the reaction mixture minimizes the amount of insoluble polymer. However, the grafted MAH content also decreases. The graft copolymer was characterized by infrared spectroscopy and the grafting extension was determined by titration.

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Modification of styrene-isoprene block copolymers—3. Addition of maleic anhydride—mechanism

Cited by 30 publications

References 6 publications

Influence of styrene on grafting efficiency of maleic anhydride onto natural rubber

Influence of styrene on grafting efficiency of maleic anhydride onto natural rubber

Preparation and Characterization of Thermoplastic Elastomers/Plasticizer - Compatibilizer/Organoclay Nanocomposites by Reactive Extrusion System

Bulk modification of styrene–butadiene–styrene triblock copolymer with maleic anhydride

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