準平衡架橋アクリル樹脂の高温ガラス状態における構造緩和
2004 年 53 巻 12 号 p. 1276-1280
詳細
2004 年 53 巻 12 号 p. 1276-1280
Structural relaxation in cross-linked poly (methyl methacrylate) (C-PMMA) quite slowly cooled from the rubbery state to a quasi-equilibrium glassy state was studied at a temperature of 10°C less than the, glass transition temperature Tg (Tg-10°C=110°C). Constant-rate mechanical tension test and differential scanning calorimetry (DSC) technique were used for the observation of structural relaxation. At long times of storage at 110°C for quasi-equilibrium C-PMMA, a prominent structural relaxation was found as highly progressive developments of yield stress in the tension test and endothermic peak in the DSC measurement. Imposition of a tensile strain of 0.10 to the slowly cooled specimens induced short times structural relaxation modes. Yet, in spite of the imposition of finite strain, long times relaxation modes were almost the same to that of unstrained quasi-equilibrium C-PMMA specimens.
