Abstract
Polymer alloys of benzoxazine resin (BA-a) and urethane prepolymer (PU) were prepared at various BA-a : PU mass ratios (100 : 0, 80 : 20, 70 : 30 and 60 : 40) via sequential cure method. Isocyanate end capped urethane prepolymer was synthesized with isocyanates and polyols. Various types of isocyanate groups were used [i.e., TDI, MDI, IPDI and HDI] in this study. Polypropylene glycol and Poly(ethylene, diethylene adipate) glycol represent polyether polyol (E) and polyester polyol (S), respectively. Experimental results revealed that glass transition temperature (Tg), flexural strength and flexural modulus increase with decreasing PU content. Furthermore, the flexural strength and flexural modulus synergism were found in the BA-a:PU based polyester polyol at all mass ratio.
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