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Titolo:
Mercapto-modified copolymers in polymer blends. III. The effect of functionalized ethylene-propylene-diene rubber (EPDM) on curing and mechanical properties of NBR/EPDM blends
Autore:
Oliveira, MG; Soares, BG;
Indirizzi:
Univ Fed Rio de Janeiro, Ctr Technol, Inst Macromol, BR-21945970 Rio De Janeiro, Brazil Univ Fed Rio de Janeiro Rio De Janeiro Brazil BR-21945970 BCeiro, Brazil
Titolo Testata:
JOURNAL OF APPLIED POLYMER SCIENCE
fascicolo: 1, volume: 82, anno: 2001,
pagine: 38 - 52
SICI:
0021-8995(20011003)82:1<38:MCIPBI>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHASE MORPHOLOGY DEVELOPMENT; NATURAL-RUBBER; FLOW VISUALIZATION; COMPATIBILIZING AGENTS; GRAFTING ANTIOXIDANTS; INTERNAL MIXER; EVA BLENDS; SYSTEM; DEGRADATION; NITRILE;
Keywords:
elastomer blends; NBR; EPDM; compatibilization; mercapto-modified copolymer;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Soares, BG Univ Fed Rio de Janeiro, Ctr Technol, Inst Macromol, BR-21945970 Rio De Janeiro, Brazil Univ Fed Rio de Janeiro Rio De Janeiro Brazil BR-21945970 BCl
Citazione:
M.G. Oliveira e B.G. Soares, "Mercapto-modified copolymers in polymer blends. III. The effect of functionalized ethylene-propylene-diene rubber (EPDM) on curing and mechanical properties of NBR/EPDM blends", J APPL POLY, 82(1), 2001, pp. 38-52

Abstract

Ethylene-propylene-diene with ethylene norbornene as the diene (EPDM) samples functionalized with thioacetate (EPDMTA) or mercapto groups (EPDMSH) were employed as compatibilizing agents for nitrile rubber (NBR)/EPDM blends. The cure rate of the blend was affected by the presence of a small portionof these compounds. EPDMTA decreases the cure rate of the blends, whereas EPDMSH was able to decrease the scorch time and increase the cure rate whenemployed in a proportion as high as 5.0 phr. The compatibilization effect was influenced by the nature of the EPDM employed in the blends. Blends consisting of an EPDM sample with lower viscosity display better dispersion ofthe EPDM phase inside the NBR matrix and also better mechanical performance with the compatibilization. The compatibilization with EPDMSH is reactive, with the formation of chemical bond between the mercapto groups of the compatibilizing agent and the double bond of the diene rubber. The compatibilization with EPDMTA is also considered to be reactive because the vulcanized blends containing this functionalized copolymer contain a higher amount of cross linked material, as indicated by the lower weight loss after swelling experiments. A scanning electron micrograph demonstrated that these functionalized copolymers led to a filler phase morphology, mainly in NBR/EPDM57C blends. The compatibilization increases the dynamic elastic modulus without affecting the damping. An improvement of thermal aging resistance of the studied blends was also achieved with the presence of the functionalized copolymers. (C) 2001 John Wiley & Sons, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/04/20 alle ore 04:15:07