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Titolo:
Polypropylene blends with potential as materials for microporous membranesformed by melt processing
Autore:
Chandavasu, C; Xanthos, M; Sirkar, KK; Gogos, CG;
Indirizzi:
New Jersey Inst Technol, Inst Polymer Proc, Newark, NJ 07102 USA New Jersey Inst Technol Newark NJ USA 07102 er Proc, Newark, NJ 07102 USA New Jersey Inst Technol, Ctr Membrane Technol, Dept Chem Engn, Newark, NJ 07102 USA New Jersey Inst Technol Newark NJ USA 07102 em Engn, Newark, NJ 07102 USA
Titolo Testata:
POLYMER
fascicolo: 3, volume: 43, anno: 2002,
pagine: 781 - 795
SICI:
0032-3861(200202)43:3<781:PBWPAM>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
TWIN-SCREW EXTRUDER; PHASE; DISPERSION; MORPHOLOGY; FILM;
Keywords:
polymer blends; microporous membranes; melt processing;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Xanthos, M New Jersey Inst Technol, Inst Polymer Proc, GITC Bldg,Suite 3901, Newark, NJ 07102 USA New Jersey Inst Technol GITC Bldg,Suite 3901 NewarkNJ USA 07102
Citazione:
C. Chandavasu et al., "Polypropylene blends with potential as materials for microporous membranesformed by melt processing", POLYMER, 43(3), 2002, pp. 781-795

Abstract

Novel microporous membranes with pore size ranging from 2 to 25 nm were produced from immiscible polypropylene blends via melt processing and post-extrusion treatments. Systems containing polystyrene and polyethylene terephthalate as the minor phase components were employed as starting membrane materials at concentrations not exceeding 15 wt%. The blends were first compounded in a co-rotating twin-screw extruder and subsequently extruded througha sheet die to obtain the non-porous precursor films. These were uniaxially drawn (100-500%) with respect to the original dimensions at a temperaturebelow the glass transition temperature of the minor phase to induce a microporous structure and then post-treated at elevated temperatures to stabilize the porous structure, which consisted of uniform microcracks in the order of a few nanometers in width. The effects of dispersed phase concentration and component melt rheology on the solid and microporous blend morphologies are presented. Finite element modeling of the stretching operation in the solid state yielded a successful interpretation of the blend response to uniaxial tension that resulted in microcrack formation. The processes developed in this work may be considered as solventless alternatives to phase inversion manufacturing practices for membranes containing mesopores. (C) 2001 Elsevier Science Ltd. All rights reserved.

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Documento generato il 03/07/20 alle ore 01:19:27