Page 40 - Engineered Interfaces in Fiber Reinforced Composites

Chapter 2. Characterization of interfaces 23

Table 2.5
Intensity ratio of Raman bands I(AI,)/I(E2J and the corresponding apparent crystal diameter, La, for
various carbon fibers"

Thornel 10 Union Carbide 0.85 50
Thornel 25 0.40 120
Thornel 50 0.29 155
Thornel 75 0.25 170
Thornel 40 0.30 150
Morganite I 0.22 200
Morganite I1 0.83 50
H.M.G. 50 Hitco 0.56 80
Fortafil 5-Y Great Lakes 0.25 180

I I I

1525 1545 1565 1585 1605 1625
Raman Frequency (crn-')

1525 1545 1565 1585 1605 1625
Raman Frequency (ern-')

Fig. 2.8. Laser Raman spectra obtained (a) for a polyacrylonitrile (PAN)-based HMS4 carbon fiber, and
(b) for a pitch-based P75S carbon fiber. After Robinson et al. (1987).