Interphase epoxy

Garton, A. and Daly, J.H. (1985). Characterization of the aramid-epoxy and carbon-epoxy interphases. Polym. Composites 6, 195-200. 

Fig. 9. A transmitted electron micrograph of an ultramicrotomed section of an aluminum-epoxy interphase. The highly ordered structure in the center is a 3.3 micron thick aluminum oxide layer present on the base metal. The featureless area is the epoxy matrix. The light areas within the oxide are fractures caused by the microtoming. The epoxy has however penetrated to the bottom of all of the 50 nm pores in the oxide...

FIG. 6—Fracture surface produced under ASTM D 2559 to show the high orientation parallel to the wood orientation even thou fracture is mainly in the epoxy interphase region. 

The results show that the crosslinking state and the degradation processes in the epoxy network depend not only on the type of curing agent and the aging regime. The properties of the stainless steel also change these properties within the epoxy interphase at the contact. 

Figure 11.1 Applied gross compression stress (as a percentage of the ultimate notched [O/eoigs compression strength) versus the cycles (log of n), for the 810-A and O materials under / = 10 fatigue. , epoxy interphase , PVP interphase...

The finite element analyses showed that the properties of the CNT/polymer interphase play an essential role for MWCNTs as reinforcements and the exploitation of the load-bearing character of the inner walls. Hence, concerning the preparation method one will need to take this into account to provide a sufficient bond/shear modulus at/of the CNT/epoxy interphase, possibly through the relevant functionalisation of MWCNTs. 

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