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Dynamic mechanical analysis (DMA) and stress-relaxation test

NN Natsumi Nishiie
RK Ryo Kawatani
ST Sae Tezuka
MM Miu Mizuma
MH Mikihiro Hayashi
YK Yasuhiro Kohsaka
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The specimen with a thickness of 0.5 mm was prepared by hot pressing at 140 °C for 2 min. A disc-shaped sample with an 8 mm diameter and ~0.5 mm thickness was measured. DMA was assessed using a shear-type rheometer, MCR102e (Anton Paar), and a disposable 8 mm plate. The frequency was fixed at 1 Hz, and a constant strain of 0.1% was applied. A cyclic cooling and heating measurement was performed with a temperature change rate of 2 °C/min.

The stress–relaxation tests for the cross-linked samples were conducted at various high temperatures with the same setup. The strain was fixed to be 3%, which was within the linear regime. The samples for the measurements were initially dried by a vacuum for 12 h, and all the above rheology measurements were conducted under N2 gas to minimize effects of moisture in the air.

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