Acrylated polyurethane (APU) was synthesized by the reaction of isocyanate polyfunctional polyurethane prepolymer with β- hydroxypropyl methacrylate in the presence of cyclohexanone. The influences of reaction temperature and ratio of starting materials to cyclohexanone in the synthesis reaction were investigated.
The final polymer APU was exposed to electron beam (EB) irradiation. The irradiation dose range was from 10
-7C/cm
2 to 10
-5C/cm
2. In APU, radiation polymerization, which led to crosslinking reaction, occured when the irradiation dose was lower, and the highly irradiated samples were degradated mainly.
The characteristic curve of the LB irradiated APU was obtained. The maximum value of dose, Dmax, which the degradation reaction dominated in APU, was 1.80×10
-5C/cm
2, as observed in experiment. From the measured curve of the relationship of the double bond content in APU on irradiation dose, it was observed that the critical value of dose, Dc, under which crosslinking reaction became the main reaction taking place in APU, was 1.32×10
-5C/cm
2. The sensitivity of APU was 6.42× 10
-6C/cm
2.
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