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Titolo:
Reaction mechanism and rheological properties of polypropylene irradiated under various atmospheres
Autore:
Lugao, AB; Hutzler, B; Ojeda, T; Tokumoto, S; Siemens, R; Makuuchi, K; Villavicencio, ALCH;
Indirizzi:
IPEN, Inst Energy & Nucl res, Sao Paulo, Brazil IPEN Sao Paulo BrazilIPEN, Inst Energy & Nucl res, Sao Paulo, Brazil EMBRARAD, Sao Paulo, Brazil EMBRARAD Sao Paulo BrazilEMBRARAD, Sao Paulo, Brazil OPP, Polo Petroquim Triunfo, R Gde Do Sul, Brazil OPP R Gde Do Sul Brazil P, Polo Petroquim Triunfo, R Gde Do Sul, Brazil Japan Atom Energy Res Inst, Takasaki Radiat Chem Res Estab, Takasaki, Gumma 37012, Japan Japan Atom Energy Res Inst Takasaki Gumma Japan 37012 Gumma 37012, Japan
Titolo Testata:
RADIATION PHYSICS AND CHEMISTRY
fascicolo: 3-6, volume: 57, anno: 2000,
pagine: 389 - 392
SICI:
0969-806X(200003)57:3-6<389:RMARPO>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
RADIATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
9
Recensione:
Indirizzi per estratti:
Indirizzo: Lugao, AB IPEN, Inst Energy & Nucl res, Sao Paulo, Brazil IPEN Sao PauloBrazil st Energy & Nucl res, Sao Paulo, Brazil
Citazione:
A.B. Lugao et al., "Reaction mechanism and rheological properties of polypropylene irradiated under various atmospheres", RADIAT PH C, 57(3-6), 2000, pp. 389-392

Abstract

It is well-known that the melt-strength properties of a polymer increases with molecular weight and with long chain branching due to the increase in the entanglement level. This study is a contribution for the understanding of the following points: - the role of branching, crosslinking and degradation on melt strength properties; - the mechanism and the kinetics of PP irradiation with time of irradiation and the importance of double bond formation. The results showed that degradation was the major reaction in the initial step of irradiation no matter the atmosphere and or antioxidant. However, double bond formation increased the production of branching and crosslinkingreactions. Double bond formation had no effect on the crystallization kinetics, on the other hand, long chain branching had a marked effect on the crystallization temperature. (C) 2000 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/12/20 alle ore 00:02:23