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Titolo:
In-process rheometry studies of LDPE compounds - Part II: Magnesium hydroxide filled
Autore:
Kelly, AL; Woodhead, M; Coates, PD; Barnwell, D; Martin, K;
Indirizzi:
Univ Bradford, Dept MEch & Med Engn, Bradford BD7 1DP, W Yorkshire, England Univ Bradford Bradford W Yorkshire England BD7 1DP , W Yorkshire, England Raychem Ltd, Swindon SN3 5HH, Wilts, England Raychem Ltd Swindon Wilts England SN3 5HH Swindon SN3 5HH, Wilts, England
Titolo Testata:
INTERNATIONAL POLYMER PROCESSING
fascicolo: 4, volume: 15, anno: 2000,
pagine: 361 - 368
SICI:
0930-777X(200012)15:4<361:IRSOLC>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
RHEOLOGICAL PROPERTIES; CALCIUM-CARBONATE; TITANIUM-DIOXIDE; POLYPROPYLENE MELTS; POLYMER MELTS; EXTRUSION; POLYSTYRENE; BLACK;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Coates, PD Univ Bradford, Dept MEch & Med Engn, Bradford BD7 1DP, W Yorkshire, England Univ Bradford Bradford W Yorkshire England BD7 1DP re, England
Citazione:
A.L. Kelly et al., "In-process rheometry studies of LDPE compounds - Part II: Magnesium hydroxide filled", INT POLYM P, 15(4), 2000, pp. 361-368

Abstract

The second part of a comprehensive study into the investigation and validation of in-process measurements on a low. density polyethylene compound during extrusion is reported. A commercial grade of branched low a density polyethylene was used in the study, compounded with various levels of magnesium hydroxide flame retardant filler, up to 50 %; by weight. In-line and on-line rheometry were used to monitor melt flow behaviour during single screw and twin screw extrusion; off-line capillary rheometry was performed on thecompound before and after extrusion, to examine any change in rheology. Morphological observations were made using scanning electron microscopy, and molecular characterisations carried out using gel permeation chromatography. in-process rheometry, was found to be able to detect the presence of filler at low and high loadings, brit was unable to discriminate between intermediate levels. Offline rheometry indicated that twin screw extrusion altered the rheology of the compound. and capillary wall slip was found to increase after extrusion. Morphological observation indicated that filler in the compound was better dispersed after extrusion, especially at high volume fractions. Molecular weight and polydispersity of the LDPE were shown to increase after extrusion, more so in the case of low filler loadings. Overall, in-process measurements provided useful rheological data, and the compound was found to exhibit complex, process-dependent rheology.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 02:57:39