Abstract
This chapter introduces the development of reaction-induced phase separation in benzoxazine blends with thermoplastics or high performance engineering plastics (such as poly (ethylene oxide), polycaprolactone, polysulfone or polyimide) or thermosets (such as bismaleimide, epoxy, or cyanate ester). The phase separation phenomenon, phase separation process, and phase morphologies influence factors and reactions in the blends are summarized. The influence of thermodynamic factors, kinetic factors, and hydrogen bond on phase separation is discussed. And the effects of morphology structures of cured blends on material properties are discussed. It is noted that in the benzoxazine/thermoset system, not only phase separation can occur through controlling the reaction sequence, but also that the cured products show excellent mechanical properties, thermal properties, and processability. Reaction induced phase separation is an effective way in modifying polybenzoxazine.
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