Microporosity of carbon fibers

✍ Scribed by L. Christner; P.L. Walker Jr.

• Publisher: Elsevier Science
• Year: 1972
• Tongue: English
• Weight: 136 KB
• Volume: 10
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(72)90357-0

✦ Synopsis

AASTRACTS 331 ment. The electron microscope (both in the scanning and transmission modes) was used to examine the topography of both wet (60% HNOs, 118°C) and dry oxidized (air, 700°C) fibers as well as fracture surfaces of composites made with treated and untreated fibers. The flexural strength of Type I reinforced epoxy composites increased with oxidation (wet) time, whereas for Type II reinforced composites, the strength decreased. The interlaminar shear strength of the former increased from 3000 to 10,000 psi, whereas only a slight improvement (-25 per cent) was observed for the latter. 25. Microporosity of carbon fibers L. Christner and P. L. Walker, Jr. (The Pennsylvania State University, University Park, Pennsylvanti f6802

). This paper will discuss the effect of carbonization temperature on the porosity of carbon fibers. Carbonization temperatures ranged from 220°C to 800°C. Porosity was determined by adsorption of carbon dioxide, butane and isobutane for various lengths of time with a maximum of 128 hr. Applicability of the molecular probe technique and activated adsorption will be considered.