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Titolo:
Effect of zinc stearate on properties of melt processable ionomer based onsodium salt of sulphonated maleated EPDM rubber
Autore:
Ghosh, SK; Bhattacharya, AK; De, PP; Khastgir, D; De, SK;
Indirizzi:
Indian Inst Technol, Ctr Rubber Technol, Kharagpur 721302, W Bengal, IndiaIndian Inst Technol Kharagpur W Bengal India 721302 1302, W Bengal, India
Titolo Testata:
PLASTICS RUBBER AND COMPOSITES
fascicolo: 1, volume: 30, anno: 2001,
pagine: 16 - 23
SICI:
1465-8011(2001)30:1<16:EOZSOP>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
IONIC THERMOPLASTIC ELASTOMER; HIGH-DENSITY POLYETHYLENE; CARBON-BLACK; PLASTICIZATION; BLENDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Ghosh, SK Eindhoven Univ Technol, Dept Chem Engn, Room STO 1-41,POB 513, NL-5600 MB Eindhoven, Netherlands Eindhoven Univ Technol Room STO 1-41,POB 513 Eindhoven Netherlands NL-5600 MB
Citazione:
S.K. Ghosh et al., "Effect of zinc stearate on properties of melt processable ionomer based onsodium salt of sulphonated maleated EPDM rubber", PLAS RUB C, 30(1), 2001, pp. 16-23

Abstract

Sulphonation of maleated copoly(ethylene/propylene/diene), followed by itsneutralisation by sodium hydroxide produces an ionomer containing both carboxylate and sulphonate anions on the backbone. Addition of zinc stearate lowers the melt viscosity of the ionomer, which is higher than the corresponding non-ionomer. Dynamic mechanical thermal analysis shows that zinc stearate acts as a low reinforcing filler under ambient conditions and as a plasticiser above 100 degreesC (i.e. above the melting point of zinc stearate). For example, incorporation of zinc stearate causes an increase in storage modulus E' at 25 degreesC, but a sharp decrease in E' at 110 degreesC. Furthermore, the plot of tan delta nu. temperature reveals that tan delta at the low glass-rubber transition temperature T-g decreases, while tan delta atthe high temperature ionic relaxation temperature T-i increases in the presence of zinc stearate. Incorporation of carbon black lowers tan delta at T-g and increases tan delta at T-i thus strengthening the biphasic structureof the ionomer. The ionomer shows higher tensile strength and modulus thanthe corresponding non-ionomer. Addition of zinc stearate increases the tensile strength and elongation at break, with marginal decrease in modulus. Carbon black increases the stress-strain properties of the zinc stearate filled ionomer. Reprocessability studies of the ionomer filled with zinc stearate and carbon black show that the material can be recycled without a decrease in properties.

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Documento generato il 29/03/20 alle ore 15:04:02