A kind of biphenyl type polyimide humidity sensitive capacitor and preparation method thereof
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A biphenyl type polyimide, humidity-sensitive capacitor technology, used in capacitors, variable capacitors, capacitors that change the capacitance by non-mechanical methods, etc., can solve the problems of poor sensitivity, accuracy and resolution, and achieve The effect of convenient source, easy molecular weight and mild reaction conditions
Inactive Publication Date: 2018-05-15
DONGHUA UNIV +1
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Problems solved by technology
In addition to poor sensitivity, accuracy and resolution, traditional measurement methods are difficult to connect with modern communication record control equipment
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Embodiment 1
[0038] 2.16 grams (0.01 moles) of 3,3'-diamino-4,4'-dihydroxybiphenyl (DAHBP), 22.00 grams (0.11 moles) of 3,4'-diaminodiphenyl ether, 37.82 grams (0.122 moles ) 3,3',4,4'-tetracarboxydiphenyl ether dianhydride and 248 grams of N,N-dimethylformamide were put into the reactor, and after stirring and reacting for 2 hours at 0°C, 309 grams of viscous The transparent and homogeneous biphenyl type moisture-sensitive polyimide precursor solution is designated as HSBP-1.
Embodiment 2
[0040] 2.16 grams (0.01 moles) of 3,3'-diamino-4,4'-dihydroxybiphenyl (DAHBP), 29.2 grams (0.10 moles) of 1,3-bis(4-aminophenoxy)benzene and 31.70 gram (0.10 mol) 2,6-bis(4-aminophenoxy) benzonitrile, 62.62 gram (0.213 mol) 3,3',4,4'-tetracarboxy biphenyl dianhydride, 254 gram N,N - Dimethylformamide and 500 grams of N-methyl-2-pyrrolidone were put into a reaction kettle, and after stirring and reacting at 5°C for 5 hours, 879 grams of viscous, transparent and homogeneous biphenyl type moisture-sensitive polyimides were obtained Precursor solution, denoted as HSBP-2.
Embodiment 3
[0042] 2.16 g (0.01 mol) of 3,3'-diamino-4,4'-dihydroxybiphenyl (DAHBP), 64.8 g (0.15 mol) of 4,4'-bis(4-aminophenoxy)diphenyl Sulfone, 39.28 grams (0.122 moles) of 3,3',4,4'-tetracarboxybenzophenone dianhydride and 21.84 grams (0.042 moles) of 2,2-bis(3,4-dicarboxyphenyl)propane di Anhydride, 640 grams of N,N-dimethylacetamide were put into the reaction kettle, and after stirring and reacting for 4 hours at 2°C, 768 grams of viscous transparent homogeneous biphenyl type moisture-sensitive polyimide precursor solution was obtained. Denoted as HSBP-3.
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Abstract
The invention relates to a humidity-sensitive biphenyl polyimide capacitor and a making method thereof. The humidity-sensitive capacitor is composed of a substrate, a lower electrode, a humidity-sensitive biphenyl polyimide coating layer and an upper electrode, wherein humidity-sensitive biphenyl polyimide is prepared through a reaction of 3,3'-diamino-4,4'-dihydroxybiphenyl, aromatic diamine and aromatic dianhydride. The making method comprises the following steps: cleaning the substrate by using a cleaning solution, putting the cleaned substrate in a drying box, drying, carrying out vacuum vapor plating to make the lower electrode, guiding a lower electrode leading wire through a JP-6 conductive adhesive, spin-coating a humidity-sensitive biphenyl polyimide precursor solution, imidizing, carrying out vacuum vapor plating to make the upper electrode, slicing, flushing by using deionized water, drying, screening, carrying out surface modification, and guiding an upper electrode leading wire through the JP-6 conductive adhesive to make the humidity-sensitive biphenyl polyimide capacitor. The humidity-sensitive biphenyl polyimide capacitor has the advantages of high sensitivity, small humidity hysteresis, simple manufacturing process, low cost and good market prospect.
Description
technical field [0001] The invention belongs to the field of functional polymer materials, in particular to a biphenyl type polyimide humidity-sensitive capacitor and a preparation method thereof. Background technique [0002] In the fields of meteorology, environmental protection, national defense, aviation, aerospace, navigation, industry, agriculture, medical care, electronic microelectronics, etc., it is often necessary to measure and control the ambient humidity. The measurement of humidity is much more complicated than the measurement of temperature, mainly because temperature is an independent measurand, while the measurement of humidity cannot be measured due to the partial pressure of water vapor in the air, so it has to be transformed into The humidity value can only be obtained by measuring the secondary parameters related to humidity and then converting them. [0003] There are three main types of traditional humidity measurement tools, namely telescopic hygrome...
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