Adequate
translation of fiber properties to the composite is affected by
various factors, and also, becomes more difficult when carbon fiber
strength/modulus increases.
Although the details should be
discussed on a case by case basis, our general understandings of the
translation phenomena are;
i)
degree of surface treatment
ii)
adhesion interaction between carbon fiber and matrix
iii)
resin elongation and modulus
iv)
resin hot-wet characteristics
Our research on carbon
fiber surface physics and chemistry is mainly conducted by
Toray
Research
Center, and composite translation to Toray Composite Research Laboratory.
Sizing is another aspect of surface treatment. Sizing is often applied to carbon fiber bundles to improve their handling characteristics.
TORAYCA has two different kinds of sizing.
Type 4 : Bisphenol A diglycidylether type,
compatible with epoxy
Type 5 :
Bisphenol A diglycidylether and copolyester of saturated fatty
acids, compatible
with epoxy and polyester
In a special case, we can
supply no-sized carbon fiber. |
