Surface characteristics of carbon fibres from PAN

✍ Scribed by B. Rand; R. Robinson

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 776 KB
• Volume: 15
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(77)90011-2

✦ Synopsis

A~~act-Surface characteristics of the three types of commercial carbon fibres from PAN, in both treated and untreated forms, have been investigated along with a series of high modulus (HM) fibres oxidised in HNO,. N, adsorption isotherms have been used to elucidate physical characteristics and Oz chemisorption measurements to determine the area on which surface complexes can form, the so called "active surface area". Comparative plots show that there is no microporosity developed during surface treatment of fibres, but high temperature degassing does bring about a degree of microporosity, as suggested by Mimeault and McKee[S]. The external area of HM fibres is increased by HNO, oxidation but there is little difference between the areas of untreated fibres and those surface treated by the supplier. Both types of treatment, however, increase the active surface areas by factors of 3-30 times, and also increase the fraction of the external surface which is in the form of edge, or active, sites.