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자료유형
학술저널
저자정보
김치형 (청주대학교)
저널정보
한국전기전자재료학회 Transactions on Electrical and Electronic Materials Transactions on Electrical and Electronic Materials 제18권 제4호
발행연도
2017.8
수록면
211 - 216 (6page)
DOI
https://doi.org/10.4313/TEEM.2017.18.4.211

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The dielectric properties of two polyurethanes (PUs) with different hard segments, i.e., aromatic methylene di-p -phenyldiisocyanate (MDI) and aliphatic hexamethylene diisocyanate (HDI), were investigated in the temperature range of -100 to100°C and in the frequency range of 1 Hz to 3 kHz. The α-relaxations induced by the glass transition of the equivalent softsegments in the two PUs occurred at relaxation times of τ = 3.46 × 10-3 s for MDI-PU and τ = 3.39 × 10-2 s for HDI-PU at -20°C,in accord with the temperature-frequency superposition principle, resulting in similar shifting factors. However, differentI-relaxations were observed for the two PUs. The I-relaxation of MDI-PU occurred due to the mobility of the chain extendersnear 80°C with a slower shifting rate than the α-relaxation. On the other hand, I-relaxation arising from both the extenderand the unconstrained hard segments of HDI-PU occurred at 70~100℃, indicating complicated dielectric behavior due topartial interaction with the α-relaxation at high frequencies. Thus, the I-relaxation of HDI-PU did not follow the superpositionprinciple. The dielectric behaviors of the PUs were mainly influenced by their phase transitions, which were affected by thestructure and components of the materials.

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