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Titolo:
MORPHOLOGICAL BEHAVIOR AND INSTRUMENTED DART IMPACT PROPERTIES OF BETA-CRYSTALLINE-PHASE
Autore:
TJONG SC; SHEN JS; LI RKY;
Indirizzi:
CITY UNIV HONG KONG,DEPT PHYS & MAT SCI,83 TAT CHEE AVE KOWLOON HONG KONG
Titolo Testata:
Polymer
fascicolo: 12, volume: 37, anno: 1996,
pagine: 2309 - 2316
SICI:
0032-3861(1996)37:12<2309:MBAIDI>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
ISOTACTIC POLYPROPYLENE; FRACTURE-TOUGHNESS; MELTING BEHAVIOR; POLYMERS; POLY(PROPYLENE); BLENDS; FORM;
Keywords:
BETA-PHASE; IMPACT STRENGTH; POLYPROPYLENE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
30
Recensione:
Indirizzi per estratti:
Citazione:
S.C. Tjong et al., "MORPHOLOGICAL BEHAVIOR AND INSTRUMENTED DART IMPACT PROPERTIES OF BETA-CRYSTALLINE-PHASE", Polymer, 37(12), 1996, pp. 2309-2316

Abstract

Specimens consisting of high-purity beta-phase polypropylene were prepared by adding a bicomponent beta-nucleator consisting of equal amounts of pimelic acid and calcium stearate. Scanning electron microscopy (SEM), differential scanning calorimetry (d.s.c.), dynamic mechanical analysis and instrumented drop weight impact tests were used to characterize the morphology, thermal behaviour and the impact properties of the beta-phase polypropylene. SEM examinations show that the beta-spherulites exhibit a sheaf-like structure with no clear boundaries between them. This distinct spherulitic morphology results in a substantial improvement in the falling weight impact resistance. Fractographic analysis reveals that microfibrils and voids were formed in the fracture induction area of the beta-form specimen. The greater impact strength observed in the beta-form material is due to the larger energy dissipation which is associated with the formation of microfibrils. Furthermore, d.s.c. analysis showed that there is no beta --> alpha phase conversion during the impact test. (C) 1996 Elsevier Science Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 08:45:07