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Titolo:
A STUDY OF CELL NUCLEATION IN THE EXTRUSION OF POLYPROPYLENE FOAMS
Autore:
PARK CB; CHEUNG LK;
Indirizzi:
UNIV TORONTO,DEPT MECH & IND ENGN TORONTO ON M5S 3G8 CANADA
Titolo Testata:
Polymer engineering and science
fascicolo: 1, volume: 37, anno: 1997,
pagine: 1 - 10
SICI:
0032-3888(1997)37:1<1:ASOCNI>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
STYRENE-ACRYLONITRILE COPOLYMER; STRUCTURAL FOAM; MICROCELLULAR FOAMS; TENSILE TOUGHNESS; POLYCARBONATE; POLYSTYRENE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
40
Recensione:
Indirizzi per estratti:
Citazione:
C.B. Park e L.K. Cheung, "A STUDY OF CELL NUCLEATION IN THE EXTRUSION OF POLYPROPYLENE FOAMS", Polymer engineering and science, 37(1), 1997, pp. 1-10

Abstract

An investigation has been performed of the cell nucleation and initial growth behaviors in the foam processing of polypropylene (PP) in both the linear and branched forms. These materials were foamed in extrusion with the two blowing agents, CO2 and isopentane. The cell density generally increased with an increased content of the blowing agent, for both CO2 and isopentane. The effect of processing pressure on the cell density was distinct when CO2 was used, whereas no pressure effect was observed in the foam processing with isopentane. The cell morphologies for the two PPs were found to be significantly different. A slightly lower nuclei density was observed in the branched PP foams than inthe linear PP foams. However, the phenomenon of cell coalescence was observed much less in the branched PP foams. Most cells in the branched PP foams were closed, whereas in the linear PP foams they were connected to each other. The experimental results indicated that the branched structure played an important role in determining the cell morphologies through its effects on the melt strength and/or melt elasticity.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 14:56:29