Dynamic Mechanical Properties and Morphological Structure of PS/EPDM Blends Prepared by In Situ-Polymerization of Styrene

Autor(es)

Lourenco, Emerson ^[1] ; Goncalves, Maria do Carmo ^[1] ; Felisberti, Maria Isabel ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Quim, BR-13083971 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Polymer Science; v. 112, n. 4, p. 2280-2289, MAY 15 2009.
• Citações Web of Science: 6

Resumo

PS/EPDM blends prepared by in situ-polymerization of styrene in the presence of EPDM are immiscible and show two phases. Furthermore, the dynamic mechanical behavior of injected specimens is quite different from that of noninjected blends. This is attributed to the differences in morphology before and after injection molding. The morphology of the noninjected blends consists of PS spherical domains covered by a thin layer of EPDM, whereas the injected blends show elastomeric dispersed phase morphology in a rigid matrix. SEM analysis was important to elucidate the changes in the dynamic mechanical behavior of PS/EPDM blends, but TEM analysis is more precise for morphological characterization and yielded the real average diameter of EPDM particles. Comparing the average diameters for the PS/EPDM blends obtained from SEM and TEM analyses, the diameters obtained from the SEM analysis are wider than those of TEM which is due to the solvent extraction effect oil the blend morphology. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 112: 2280-2289, 2009 (AU)

• Processo FAPESP: 03/04246-2 - Síntese e caracterização de poliestireno de alto impacto à base do elastômero AES
• Beneficiário: Emerson Lourenco
• Modalidade de apoio: Bolsas no Brasil - Doutorado