Reactive Processing Of Polymer Blend Using Reactive Compatibilization And Dynamic Crosslinking: Phase Morphology Control And Microstructure – Property Relations

Harrats, Charef; Groeninckx, Gabriël

doi:10.1007/978-1-4020-2735-2_9

Cited by 6 publications

(1 citation statement)

References 7 publications

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“…Moreover, dynamic vulcanization can be considered as a compatibilization technique in the attempt to increase the compatibility of immiscible thermoplastic/elastomer blends. Dynamically vulcanized blends have been recognized as new outstanding materials combining good processability of thermoplastics and the unique elastic behavior of elastomers together, such as the potential to be recyclable, improved ultimate tensile strength, high strain recovery, high fatigue resistance, high oil resistance and high melt strength . High density polyethylene (HDPE)/ethylene vinyl acetate blends were dynamically vulcanized using dicumyl peroxide (DCP) as a free radical initiator and it was found that the shear viscosity of the vulcanized blends was higher than that of unvulcanized blends, in particular at low shear rates, because of the predominant crosslinking of the rubber phase .…”

Section: Introductionmentioning

confidence: 99%

Effect of acrylonitrile content of acrylonitrile butadiene rubber on mechanical and thermal properties of dynamically vulcanized poly(lactic acid) blends

Samthong

Kunanusont

Deetuam

et al. 2019

Polymer International

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We report here the morphology, thermal and tensile properties of poly(lactic acid) (PLA) blends composed of acrylonitrile butadiene rubber (NBR) with different acrylonitrile contents with/without dynamic vulcanization by dicumyl peroxide (DCP). The interfacial tension of PLA and NBR measured by contact angle measurement decreased as the acrylonitrile content of NBR decreased. Likewise, SEM images showed that the rubber particle size reduced with decreasing acrylonitrile content owing to the stronger interfacial adhesion between the PLA matrix and NBR domains. Incorporation of DCP at 1.0 phr for dynamic vulcanization led to higher crosslink density and, in turn, optimal tensile strength and tensile toughness as a result of the action of PLA-NBR copolymer as a reactive compatibilizer. The dynamic vulcanization of the blends containing low acrylonitrile NBR gave the most improved tensile properties because the free radicals from DCP decomposition preferentially attacked the allylic hydrogen atoms or double bonds of the butadiene backbone. Accordingly, more NBR macroradicals were generated and probably more PLA-NBR copolymers were produced. Moreover, further addition of DCP at 2.0 phr provided a large amount of crosslinked NBR gel, which significantly degraded the tensile properties. From the DSC results, dynamic vulcanization lowered the cold crystallization temperature, implying an improvement of cold crystallization. Finally, TGA results showed a higher degradation temperature as a function of DCP content, which suggested that thermal stability increased due to stronger interfacial adhesion as well as higher gel content.

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Section: Introductionmentioning

confidence: 99%