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the new peak at ¦Ä 3.65 ppm was correlated with the methylene proton of p-carbon atom relative to the carbonyl group in PCL. It indicates that the PCL free radical formed by the hydrogen abstraction of the ¦Á-carbon atom relative to the carbonyl group in PCL by the action of the homolytic scission of organic peroxide will attack the double bond in the methacrylate unit¡£ It is well known that free radicals from the thermal homolysis of BPOs can be thought of as having nucleophilic properties , and they can abstract the hydrogen at the ¦Á-carbon atom relative to the carbonyl of PCL, leading to the stabilization of the resulting radical by forming conjugation with the carbonyl group.

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