Viscoelastic properties of reactive and non‐reactive blends of ethylene‐methyl acrylate copolymers with styrene‐maleic anhydride copolymer

Bayram, Göknur; Yilmazer, Ülkü; Xanthos, M.

doi:10.1002/pen.10726

Cited by 12 publications

(7 citation statements)

References 18 publications

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“…It has been shown that several thermoplastics after reactive modification by chain extension exhibit a more enhanced shear‐thinning behavior in the lower shear‐rate region, which is attributed to a long‐time‐relaxation mechanism, such as entanglement couplings between the high MW fraction and those associated with long‐chain branches. However, broadening the relaxation time distribution is also responsible for the weak level of shear thinning in the higher shear‐rate region 7, 28, 29. The modified PET produced in this work consisted of gel particles dispersed in a polymeric melt, as demonstrated by the data in Figure 6.…”

Section: Resultsmentioning

confidence: 86%

Molecular and structural analysis of a triepoxide‐modified poly(ethylene terephthalate) from rheological data

Dhavalikar

Yamaguchi

Xanthos

2003

J. Polym. Sci. A Polym. Chem.

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The effects of reactive melt modification of poly(ethylene terephthalate) (PET) with a multifunctional epoxide-triglycidyl isocyanurate-that lead to chain extension/branching and formation of gel-like structures were rheologically characterized. The storage and loss moduli and the complex viscosity of the modified PET were larger than those of the unmodified PET. The elastic or solidlike behavior of PET was enhanced after reactive modification as a result of chain extension/branching. Modified Cole-Cole plots revealed that the modified resins show higher elasticity than the unmodified one. Reactive modification characterized by the presence of long-chain branching resulted in a wider molecular weight distribution. The effects of mixing temperature and the concentration of modifier corresponding to different stoichiometries were investigated. Higher amounts of modifier resulted in a polymeric structure near the sol-gel transition point whose linear viscoelastic properties obey scaling law. The relaxation spectrum was calculated from the oscillatory shear data by Tschoegl equations. Certain modified resins have rheological properties suitable for process operations such as extrusion foaming, blow molding, and thermoforming.

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Section: Resultsmentioning

confidence: 86%

Molecular and structural analysis of a triepoxide‐modified poly(ethylene terephthalate) from rheological data

Dhavalikar

Yamaguchi

Xanthos

2003

J. Polym. Sci. A Polym. Chem.

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“…The majority of previous rheological studies on reactively compatibilized polymer blends mainly focused on their linear viscoelastic behavior. 11,12 Reactive compatibilization significantly increases the complex modulus of blends of polyamide 6 (PA 6) and styrenic polymers in the low frequency range. 13 Quantitative analysis of the linear viscoelastic data using the extended model of Palierne 14,15 revealed that the physical principles which were established for physically compatibilized blends with preformed compatibilizing agents 16,17 are also valid for in situ compatibilized blends.…”

Section: Introductionmentioning

confidence: 99%

Reactive Blending of Polyamide 6 and Styrene−Acrylonitrile Copolymer: Influence of Blend Composition and Compatibilizer Concentration on Morphology and Rheology

Sailer

Handge

2008

Macromolecules

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In this article, we report on the influence of reactive compatibilization on the morphological and rheological properties of blends of polyamide 6 (PA 6) and a styrene-acrylonitrile copolymer (SAN). PA 6/SAN blends with two different composition ratios (70/30 and 30/70) and varying concentration of a styrene acrylonitrile maleic anhydride terpolymer (SANMA) were prepared. During melt mixing, the amino end groups of PA 6 react with the maleic anhydride groups of SANMA. The objective of this work is to study the elastic and viscous properties of the blends in shear and elongation as a function of compatibilizer concentration. The composition ratio of the blends (PA 6 or SAN matrix) has a strong influence on the morphology and rheology of the blends, in particular for large SANMA concentrations. We explain this phenomenon by the asymmetric properties of the reactively compatibilized interface which originates from the comblike architecture of the in situ generated interfacial agent. In linear viscoelastic shear oscillations, the reactively compatibilized PA 6/SAN blends with a PA 6 matrix depict for large SANMA concentrations the power laws G′ ∝ G′′ ∝ ω n with n ≈ 0.58 whereas the blends with a SAN matrix display a solidlike low frequency behavior. In melt elongation, the extensional viscosity of the PA 6/SAN blends exceed its linear viscoelastic prediction for large SANMA concentrations. Furthermore, our AFM investigations of elongated and subsequently quenched samples reveal that the stretch ratio of spherical SAN domains in the PA 6 matrix increases with SANMA concentration. In recovery, these stretched SAN domains recover more slowly to an isotropic shape when the SANMA concentration was increased.

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“…The melt behavior is considered to be more elastic if it is located further right [35] . The data of the chain-extended copolyester with a higher PPDI content was further on the right side and approached the 45 ° line at all frequencies, whereas the unreacted copolyester could not approach the 45 ° line, even at high frequencies.…”

Section: Rheological Properties Of the Chain-extended Copolyestermentioning

confidence: 99%

Preparation of high molecular weight and elastic copolyester by reactive extrusion with diisocyanate compound for laser printing process

Roh¹,

Kim²,

Lee

et al. 2012

Journal of Polymer Engineering

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A branched copolyester was synthesized using dimethyl terephthalate (DMT), 2,2-bis[4-(2-hydroxypropoxy)phenyl] propane, ethylene glycol (EG) and 2-(hydroxymethyl)-2-ethylpropane-1,3-diol (trimethylol propane, TMP). The branched copolyester and p -phenylene diisocyanate (PPDI) were melt extruded to enhance the melt viscosity and elasticity for use as a toner binder in the laser printing process. The effects of PPDI content on melt, thermal and rheological properties of the chain-extended copolyester were investigated. The melt fl ow index (MI) decreased with increasing amount of PPDI, due to a reaction between the hydroxyl chain end and isocyanate group. The storage modulus, loss modulus and complex viscosity of the chain extended copolyester were higher and the modifi ed Cole-Cole plots revealed the chain extended copolyester to have higher elasticity than that of the branched copolyester. The chain extended copolyester exhibited suitable melt and rheological properties for applications as a toner binder in the laser printing processes.

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Viscoelastic properties of reactive and non‐reactive blends of ethylene‐methyl acrylate copolymers with styrene‐maleic anhydride copolymer

Cited by 12 publications

References 18 publications

Molecular and structural analysis of a triepoxide‐modified poly(ethylene terephthalate) from rheological data

Molecular and structural analysis of a triepoxide‐modified poly(ethylene terephthalate) from rheological data

Reactive Blending of Polyamide 6 and Styrene−Acrylonitrile Copolymer: Influence of Blend Composition and Compatibilizer Concentration on Morphology and Rheology

Preparation of high molecular weight and elastic copolyester by reactive extrusion with diisocyanate compound for laser printing process

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