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Titolo:
MECHANICAL-BEHAVIOR OF INJECTION-MOLDED BETA-CRYSTALLINE PHASE POLYPROPYLENE
Autore:
TJONG SC; SHEN JS; LI RKY;
Indirizzi:
CITY POLYTECH HONG KONG,DEPT PHYS & MAT SCI KOWLOON HONG KONG
Titolo Testata:
Polymer engineering and science
fascicolo: 1, volume: 36, anno: 1996,
pagine: 100 - 105
SICI:
0032-3888(1996)36:1<100:MOIBPP>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
ISOTACTIC POLYPROPYLENE; MELTING BEHAVIOR; POLY(PROPYLENE); ADDITIVES; FORM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
18
Recensione:
Indirizzi per estratti:
Citazione:
S.C. Tjong et al., "MECHANICAL-BEHAVIOR OF INJECTION-MOLDED BETA-CRYSTALLINE PHASE POLYPROPYLENE", Polymer engineering and science, 36(1), 1996, pp. 100-105

Abstract

High purity and a large amount of beta-modification can be produced in polypropylene (PP) by adding a bicomponent beta-nucleator consistingof equal amounts of pimelic acid and calcium stearate. Wide angle X-ray diffraction (WAXD), scanning electron microscopy(SEM), static tensile tests, Izod impact tests, and instrumented drop weight impact testing were used to characterize the structure, morphology, and mechanicalbehavior of the beta-phase PP. The WAXD patterns show that the relative content of the beta-phase (K value) in the skin layer of the injection molded specimen is 0.54, whereas the K value in the core section is 0.92, SEM observations reveal that the beta-spherulite exhibits a sheaf-like structure and there are no clear boundaries between the spherulites. Static tensile tests indicate that the elongation at break of pure PP is enhanced by the addition of a beta-nucleator. The impact and drop weight tests also indicate that the impact resistance of PP is improved by adding the beta-nucleating agent. The improvement in impact toughness is associated with the formation of microcrazes within thePP.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/09/20 alle ore 11:49:37