Preparation method of polyvinylidene-fluoride-base temperature-sensitive resistance material with negative temperature coefficient effect
A polyvinylidene fluoride, negative temperature coefficient technology, applied in the direction of resistors with negative temperature coefficient, can solve the problems of low sensitivity, high filling amount of conductive phase, large room temperature resistivity, etc., to achieve low room temperature resistivity, high Effect of polymer-based negative temperature coefficient strength, simple temperature measurement
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[0023] Embodiment 1: The preparation method of the polyvinylidene fluoride-based temperature sensitive resistance material with negative temperature coefficient effect in this embodiment is realized according to the following steps:
[0024] 1. Using graphite powder as raw material, the improved Hummers method is used to prepare graphite oxide;
[0025] 2. Add the graphite oxide prepared in step 1 to N,N-dimethylformamide, and ultrasonically disperse for 1~3h to obtain N,N-dimethylformaldehyde of graphene oxide with a concentration of 0.1~1.0mg / mL Formamide dispersion I;
[0026]3. Add 5-200 mg of initiator azobisisobutyronitrile, 0.1-5 g of sodium p-styrene sulfonate and 20-100 mL of N,N-dimethylformaldehyde of graphene oxide prepared in step 2 into the four-necked flask Amide dispersion liquid I, then pass inert protective gas into the four-necked flask for 10~30min, heat it to 60~80℃ in a water bath under magnetic stirring, continue to react for 6~24h, and then filter it w...
Example Embodiment
[0030] Embodiment 2: The difference between this embodiment and Embodiment 1 is that: in step 2, the N,N-dimethylformamide dispersion liquid I of graphene oxide with a concentration of 0.3-0.8 mg / mL is obtained. Other steps and parameters are the same as in the first embodiment.
Example Embodiment
[0031] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is: in step 3, 10-100 mg of initiator azobisisobutyronitrile, 1-4 g of sodium p-styrene sulfonate and 30~90mL of graphene oxide dispersion liquid I of N,N-dimethylformamide prepared in step 2. Other steps and parameters are the same as in the first or second embodiment.
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