Effect of Molecular Weight of the Reactive Precursors in Melt Reactive Blending

Yin, Zhihui; Koulic, Christian; Jeon, Hong G.; Pagnoulle, Christine; Macosko, Chris; Jérôme, Robert

doi:10.1021/ma0206366

Cited by 32 publications

(23 citation statements)

References 13 publications

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“…[32,33] A third attractive strategy, by a continuous process, consists to synthesize, in situ, a block or graft copolymer at the interface between the immiscible polymers. [24,[34][35][36][37][38][39][40][41][42][43][44][45][46] Reactive extrusion can then be used with the advantage to combine simultaneously both the blending and the chemical reaction with short residence times. These reactions often happen between two functional groups located at the end of the polymer chains.…”

Section: Introductionmentioning

confidence: 99%

Solvent-free preparation, characterization, and properties of SEBS–g–polycarbonate copolymers

Chevallier

Becquart

Majesté

et al. 2013

Designed Monomers and Polymers

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The reactions between polycarbonate (PC) and polystyrene-block-poly(ethylene-butylene)-block-polystyrene-graftedmaleic anhydride (SEBS-g-MAH) is a novel, convenient, solvent-free, and easy way to create SEBS-g-PC in order to compatibilize polystyrene and PC blends. This study determines the most efficient catalyst among Tin (II) bis(2-ethylhexanoate) (SnOct 2 ), 1,5,7-Triazabicyclo[4.4.0]dec-5-ene (TBD), Titanium tetrabutoxide (Ti(OBu) 4 ) and Sodium 4-hydroxybenzenesulfonate dihydrate (SHBS) in the molten state at 220°C. From 20 to 30 wt% of SEBS-g-MAH (or KFG) chains became insoluble. The size exclusion chromatography analyses showed the formation of a double distribution due to PC chains scission and grafting reactions onto SEBS-g-MAH with the exception of the Ti(BuO) 4 use. Fine microstructures with a percolation effect proved the efficiency of both the TBD and the SnOct 2 . The PC transition temperature decreased in at least 10°C, confirmed that only SnOct 2 and TBD were efficient to catalyze the grafting reactions. No evolution was observed with the SHBS and Ti(OBu) 4.

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Section: Introductionmentioning

confidence: 99%

Solvent-free preparation, characterization, and properties of SEBS–g–polycarbonate copolymers

Chevallier

Becquart

Majesté

et al. 2013

Designed Monomers and Polymers

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“…This strategy is well adapted for acrylic systems for which functional block copolymers can be rather easily prepared, but it is more difficult to apply for PE/PA or other systems for which the synthesis of block copolymers is more challenging. Yin et al24 studied kinetics of end‐grafting of PS and poly(methyl methacrylate) for chains of different length while keeping the concentration of reactive species constant. Interestingly, in such mixture, at short reactive times, both long and short PS chains can be grafted whereas for longer reactive times, only short chains react, leaving long PS chains unreacted.…”

Section: Introductionmentioning

confidence: 99%

Co‐continuous Nanostructured Blend by Reactive Blending: Incorporation of High Molecular Weight Polymers

Gani

Tencé‐Girault

Millequant

et al. 2010

Macro Chemistry & Physics

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One of the most challenging issues remaining in the design and the synthesis of robust nanostructured polymers blends is incorporating long crystallizable chains while preserving the co‐continuity of the phases. Here, we demonstrate that by reactive blending of functionalized polyolefin and polyamides such co‐continuous structures can be obtained provided that a bimodal mixture of short and long polyamides is used. The short chains react more readily to form graft copolymers that facilitate both grafting of long chains and formation of nanostructures. We discuss different mixing strategies, characterize, and compare reacted products and resulting blend structures.

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“…An alternative explanation has been put forward by Yin et al [23] and Hu et al [24], who argued that when the interface is covered by the copolymer formed, the reactive groups cannot diffuse through the copolymer. Hu referred to this phenomenon as interfacial screen effect [24].…”

Section: Polymer Blendsmentioning

confidence: 99%

Monitoring Reactive Processes along the Extruder

Covas

Machado

2005

International Polymer Processing

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This paper reports data obtained from monitoring the evolution of chemical conversion and morphology during the production of a compatibilized polymer blend of PA 6/EPM/EPM-g-MA and of modified polyolefins (grafted with MA) in a co-rotating twin screw extruder. In the first case, the MA content of the modified rubber decreases strongly to almost zero-level and the particle size reduces dramatically from mm to sub-lm level already in the melting zone. The process seems to be mainly influenced by the local flow characteristics, as they assure efficient generation and renewal of interfacial area. In the second case of MA grafting, a similar evolution is observed regardless of the polyolefin type but, for this kind of reactions, temperature and residence time play an important role.A brief presentation of the on-line monitoring tools used in the above studies is also included.

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Effect of Molecular Weight of the Reactive Precursors in Melt Reactive Blending

Cited by 32 publications

References 13 publications

Solvent-free preparation, characterization, and properties of SEBS–g–polycarbonate copolymers

Solvent-free preparation, characterization, and properties of SEBS–g–polycarbonate copolymers

Co‐continuous Nanostructured Blend by Reactive Blending: Incorporation of High Molecular Weight Polymers

Monitoring Reactive Processes along the Extruder

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