Phase behavior of magnesium stearate blended with polyethylene ionomers / Katsuyuki Wakabayashi in Industrial & engineering chemistry research, Vol. 49 N° 23 (Décembre 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 23 (Décembre 2010) . - pp. 11906–11913 Titre : Phase behavior of magnesium stearate blended with polyethylene ionomers Type de document : texte imprimé Auteurs : Katsuyuki Wakabayashi, Auteur ; Richard A. Register, Auteur Année de publication : 2011 Article en page(s) : pp. 11906–11913 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Magnesium Polyethylene ionomers Résumé : The phase behavior in blends of magnesium salts of long-chain fatty acids with magnesium-neutralized ethylene-based ionomers is described. Anhydrous magnesium stearate and magnesium stearate−palmitate, collectively termed MgSt(Pm), show a common phase behavior, consisting of a crystalline lamellar mesophase (LAM) bilayer phase at low temperatures, a liquid crystalline hexagonal (HEX) phase at intermediate temperatures, and a molten disordered (DIS) phase at high temperatures. Once heated into the HEX or DIS phase, neat MgSt(Pm) is kinetically prevented from reforming the LAM phase upon cooling. Blending an ionomer into MgSt(Pm) destabilizes the HEX phase in favor of DIS; an intimately mixed DIS phase is formed above the LAM and ionomer melting points, where the ionomer acts as an effective solvent for the MgSt(Pm). Quenching this solution forms co-crystals that incorporate alkyl tails from the fatty acid salt and ethylene sequences from the ionomer. Heating the blend to below the LAM melting point melts the co-crystals and allows pure, well-ordered LAM MgSt(Pm) to crystallize from the solution. A generalized phase diagram for MgSt blended with ionomers is presented to describe the observed behavior. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100109e [article] Phase behavior of magnesium stearate blended with polyethylene ionomers [texte imprimé] / Katsuyuki Wakabayashi, Auteur ; Richard A. Register, Auteur . - 2011 . - pp. 11906–11913. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 23 (Décembre 2010) . - pp. 11906–11913 Mots-clés : Magnesium Polyethylene ionomers Résumé : The phase behavior in blends of magnesium salts of long-chain fatty acids with magnesium-neutralized ethylene-based ionomers is described. Anhydrous magnesium stearate and magnesium stearate−palmitate, collectively termed MgSt(Pm), show a common phase behavior, consisting of a crystalline lamellar mesophase (LAM) bilayer phase at low temperatures, a liquid crystalline hexagonal (HEX) phase at intermediate temperatures, and a molten disordered (DIS) phase at high temperatures. Once heated into the HEX or DIS phase, neat MgSt(Pm) is kinetically prevented from reforming the LAM phase upon cooling. Blending an ionomer into MgSt(Pm) destabilizes the HEX phase in favor of DIS; an intimately mixed DIS phase is formed above the LAM and ionomer melting points, where the ionomer acts as an effective solvent for the MgSt(Pm). Quenching this solution forms co-crystals that incorporate alkyl tails from the fatty acid salt and ethylene sequences from the ionomer. Heating the blend to below the LAM melting point melts the co-crystals and allows pure, well-ordered LAM MgSt(Pm) to crystallize from the solution. A generalized phase diagram for MgSt blended with ionomers is presented to describe the observed behavior. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100109e

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