Abstract
The macroscopic physical properties of commercially available bisphenol -A epoxy resins cured by acid anhydride in which amount of the plasticizer, polypropyleneglycol was changed systematically have been measured and were compared with the amount of free volume evaluated by the positron annihilation technique. The lifetime and the intensity of orthopositronium were used to evaluate the amount of the free volume in the epoxy resins. It was found that up to the certain amount of plasticizer, the amount of the free volume did not increase so much and then showed the marked increase. The close correlations were found between the amount of the free volume and the macroscopic physical properties such as hardness and specific volume
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