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Inata, Hitoshi; Ayama, Kazuhiko; Fujiyama, Mitsuyoshi

doi:10.4325/seikeikakou.13.391

Cited by 3 publications

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“…Although the viscosities of MH-30 and MH-50 are higher than that of MP-MH, which is an ionically crosslinked compound produced by the filling of magnesium hydroxide (MH), in a previous study, 37 the extrudate surfaces of the former are rough whereas that of the latter is smooth. Accordingly, it is assumed that the factor determining the extrudate nature is not the viscosity of whole compound but the viscosity of matrix resin itself.…”

Section: Extrudate Appearancementioning

confidence: 99%

“…Fujiyama 23 measured the capillary flow properties of an LDPE and a PP covalently crosslinked with a peroxide and found that is largely increased by light crosslinking and that the values of samples with considerably high degrees of crosslinking are considerably high and scarcely change with shear rate, agreeing with the results of the present experiments. Inata et al 37 showed that the of an ionically crosslinked compound produced by the filling of MH, MP-MH, is considerably higher than that of an uncrosslinked compound, P-MH. Among the ionically crosslinked compounds in the present study, the increase of is particularly notable at high MH contents in the MH series.…”

Section: End Correction Coefficientmentioning

confidence: 99%

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Rheological properties of ionically crosslinked poly(propylene)‐type thermoplastic elastomers

Fujiyama

Yamane

Ayama

et al. 2002

J of Applied Polymer Sci

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Maleic anhydride was grafted onto poly(propylene) (PP)-type thermoplastic elastomer PER by reactive processing with a screw extruder and a maleated PER (MPER) was prepared. With the intent of ionic crosslinking, metal compounds such as aluminum stearate (AlSt), magnesium stearate (MgSt), calcium stearate (CaSt), zinc stearate (ZnSt), potassium stearate (KSt), sodium stearate (NaSt), magnesium hydroxide (MH), zinc oxide (ZnO), and zinc sulfide (ZnS) were added to the MPER and meltmixed with the screw extruder, and crosslinked compounds were obtained. The degree of crosslinking estimated from the gel fraction was in the order AlSt, MgSt, CaSt, ZnSt Ͼ NaSt, KSt Ͼ MH Ͼ ZnO, ZnS Ͼ MPER. The rheological properties, such as capillary flow properties and dynamic viscoelasticities, of the compounds were measured and their melt processabilities were evaluated. The viscosity increased with increasing the content of the metal compounds and the increase was higher at the lower shear rate. The increasing effect of the viscosity at low shear rates was AlSt Ͼ MgSt Ͼ ZnSt Ͼ NaSt Ͼ KSt Ͼ MH Ͼ ZnO Ͼ ZnS Ͼ MPER. Namely, the viscosity increasing effect of the metal salt of stearic acid is the higher for the larger ionic charge and the viscosity increasing effects of other compounds are lower than those of the metal salts of stearic acid. Accordingly, by changing the kind and content of the metal compounds, the viscosity can be freely controlled. Considering also other rheological characteristics, these ionically crosslinked compounds are assumed to show ideal flow processabilities except for the extrudate appearance. To improve the appearance, it is necessary to dilute the compound with unmodified PER, PP, or fillers.

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Section: Extrudate Appearancementioning

confidence: 99%

Section: End Correction Coefficientmentioning

confidence: 99%

Rheological properties of ionically crosslinked poly(propylene)‐type thermoplastic elastomers

Fujiyama

Yamane

Ayama

et al. 2002

J of Applied Polymer Sci

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Rheological properties of ionically and covalently crosslinked polypropylene‐type thermoplastic elastomers

Fujiyama

Kondou

Ayama

et al. 2002

J of Applied Polymer Sci

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Maleic anhydride was grafted onto a polypropylene-type thermoplastic elastomer PER by reactive processing with a screw extruder, and a maleated PER (MPER) was prepared. Aiming at ionic crosslinking, magnesium 12-hydroxy stearate (MgStOH), zinc oxide (ZnO), and zinc sulfide (ZnS), and aiming at covalent crosslinking, melamine as an amino compound, and Epocizer and GRYCI-ALE as epoxy compounds, were added to the MPER, melt-mixed by use of the screw extruder, and crosslinked compounds were obtained. The rheological properties such as capillary flow properties and dynamic viscoelasticities of the compounds were measured and their melt processabilities were evaluated. The degree of crosslinking was in the order of epoxy compounds Ͼ MgStOH Ͼ melamine Ͼ ZnO, ZnS Ͼ MPER (blank). In the case of the compound with MgStOH of a moderately high degree of crosslinking, the nonNewtonian behavior is remarkable and the die swell ratio is low and suitable for extrusion. However, in the case of compounds with epoxy compounds of an excessive degree of crosslinking, fine extrudate cannot be obtained due to the lack of fusion and the control of degree of crosslinking is necessary.

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Research Topics of “Ionomer” Resin

Nishioka¹

2010

Seikei kako

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Cited by 3 publications

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Rheological properties of ionically crosslinked poly(propylene)‐type thermoplastic elastomers

Rheological properties of ionically crosslinked poly(propylene)‐type thermoplastic elastomers

Rheological properties of ionically and covalently crosslinked polypropylene‐type thermoplastic elastomers

Research Topics of “Ionomer” Resin

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