Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 134, Issue 24, Pages -Publisher
WILEY
DOI: 10.1002/APP.44973
Keywords
capactive humidity sensor; copolymer composition; polyimide-polyurethane block copolymer
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Funding
- Ministry of Trade, Industry and Energy Republic of Korea, Republic of Korea [10050946]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10050946] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Polyimide (PI)-polyurethane-urea (PU) block copolymers (PI-PU75/25, PI-PU50/50, and PI-PU25/75) were prepared by reaction between anhydride-terminated poly(amic acid) prepolymers with various number-average degree of polymerization ((Xn) over bar = 73/49/25) and isocyanate-terminated urethane-urea prepolymers with various (Xn) over bar (11/21/31) to obtain high performance capacitive humidity sensors. Pure PI and PU were also prepared to compare with PI-PU copolymers. This study examined the effect of PU content on the water absorption %/water vapor transmission rate, thermal and mechanical properties and sensing properties of PI-PU block copolymers. The thermal stability and mechanical properties of the copolymer decreased markedly with increasing PU content. The sensitivity of sensor increased sharply with increasing PU content from 0 to 25 wt %, and then increased a little. The hysteresis of sensor decreased sharply with increasing PU content up to 50 wt %, and then decreased a little. These results demonstrate the apparent upside of using two copolymers (PI-PU75/25 and PI-PU50/50) compared to using pure PI, in terms of sensor performance. (C) 2017 Wiley Periodicals, Inc.
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