Dynamic viscoelastic properties and thermal properties of Ni powder–epoxy resin composites

✍ Scribed by Susumu Nikkeshi; Masuo Kudo; Toru Masuko

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 240 KB
• Volume: 69
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19980926)69:13<2593::aid-app9>3.0.co;2-5

✦ Synopsis

The composite materials containing metal Ni powder of 5-15 mm in size were prepared by use of the matrix epoxy resin of glycidyl amine crosslinked with bis-4-amino-3-methylcyclohexyl methane and 2,4-diamine 3,5-dimethyltoluene. Dynamic viscoelastic properties of the composites at various volume fraction ( F p ) of Ni powder have been measured over the temperature range from 30 to 300ЊC. The peak temperatures in dynamic loss modulus-temperature diagrams of the composite increased with increasing F p , although the peak position was abruptly shifted to lower temperatures in the range of F p more than 0.245. At this high concentration of F p , agglomeration of the particles occurring in the composite lead to reduction of the interaction between Ni particle and epoxy resin. Parallel studies on the thermal conductivity ( l) of the composites materials showed that the value of l at F p Å 0.245 increased by approximately 7 times that of the original epoxy resin. The shape of Ni particles also affected the thermal durabilities of the composites; the rough surface of Ni powder yields a higher storage modulus of the composite than that of the materials containing the powder with a smooth surface, which had been brought through a ball-milling process. The finding suggested that the increasing in specific surface area of the powder improved the thermal durability of the composites as well as their mechanical properties.