Effects of glass bead content and surface treatment on viscoelasticity of filled polypropylene/elastomer hybrid composites

✍ Scribed by Liang, J Z; Li, R K Y; Tjong, S C

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 220 KB
• Volume: 48
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199911)48:11<1068::aid-pi218>3.0.co;2-k

✦ Synopsis

The dynamic mechanical properties of A-glass bead ®lled polypropylene (PP)/ethylene± propylene±diene monomers polymer (EPDM) ternary composites have been measured over a temperature range from À80 °C to 100 °C and at a ®xed frequency of 1 Hz, using a dynamic mechanical analyser (DMA), to identify the effects of the ®ller content and its surface treatment with a silane coupling agent on the dynamic viscoelastic behaviour. The results show that the storage modulus (E ' c ) and loss modulus (E @ c ) of these composites with 10% volume fraction of EPDM at 25 °C increase nonlinearly with increasing volume fraction of glass beads (f g ). At the same test conditions, the E ' c value of the PP/EPDM ®lled with pretreated glass beads is higher than that of the uncoated glass bead ®lled PP/ EPDM system, especially at higher f g , while the difference in E @ c between both systems is very small. The mechanical damping for the former decreases with increasing f g , but the opposite is true for the latter. The glass transition temperature of these composites varies irregularly with f g . The dynamic complex viscosity increases nonlinearly with an increase of f g . In addition, the interfacial structure between the matrix and inclusions has been observed by means of a scanning electron microscope.