Polyimide precursor solution and polyimide shaped article
A polyimide precursor solution contains a polyimide precursor, wherein in the case where the polyimide precursor is analyzed by gel permeation chromatography, the elution curve of the polyimide precursor has a region A including a higher-molecular-weight peak and a region B including a lower-molecular-weight peak; a weight average molecular weight determined from the region A in terms of polystyrene is approximately 10,000 or more, and a weight average molecular weight determined from the region B in terms of polystyrene is approximately less than 10,000; and when the area of the region A is a and the area of the region B is b, the polyimide precursor satisfies Equation (1) a /( a+b )=approximately from 0.70 to 0.98. Equation 1:
1. A polyimide shaped article that is a thermally cured product of a polyimide precursor solution,
wherein a common logarithm value of a surface resistivity of an outer surface of the polyimide shaped article is 8 (Log Ω/□) to 13 (Log Ω/□),
wherein the polyimide precursor solution comprises:
a polyimide precursor;
a solvent, the solvent including an organic solvent and a water, and a content of the water is from 10 weight % to 95 weight % relative to a total weight of the organic solvent and the water in the solvent;
a tertiary amine compound; and
a conductive filler,
wherein the tertiary amine compound is at least selected from the group consisting of a tertiary amine compound having an aminoalkyl alcohol skeleton, a tertiary amine compound having a morpholine skeleton, and a tertiary amine compound having a piperidine skeleton,
wherein the polyimide precursor is configured such that, in a case where the polyimide precursor is analyzed by gel permeation chromatography:
an elution curve of the polyimide precursor has a region A including a higher-molecular-weight peak and a region B including a lower-molecular-weight peak;
a weight average molecular weight determined from the region A in terms of polystyrene is approximately 10,000 or more, and a weight average molecular weight determined from the region B in terms of polystyrene is approximately less than 10,000; and
when the area of the region A is a and the area of the region B is b, the polyimide precursor satisfies Equation (1):
a /( a+b )=approximately from 0.70 to 0.81, Equation 1
wherein the weight average molecular weight of the whole polyimide precursor is from 50,000 to 200,000.
2. The polyimide shaped article according to claim 1 , wherein a/(a+b) is approximately from 0.70 to 0.75 in Equation 1.
3. The polyimide shaped article according to claim 1 , wherein the tertiary amine compound is at least one compound selected from the group consisting of dimethylaminoethanol, N-methylmorpholine, and 4-hydroxymethylpiperidine.
4. The polyimide shaped article according to claim 1 , wherein a/(a+b) is approximately from 0.71 to 0.81 in Equation (1).
5. The polyimide shaped article according to claim 1 , wherein a/(a+b) is approximately from 0.73 to 0.81 in Equation (1).
6. The polyimide shaped article according to claim 1 , wherein the polyimide shaped article is a film.
7. The polyimide shaped article according to claim 1 , wherein the polyimide shaped article is an endless belt.
8. The polyimide shaped article according to claim 1 , wherein the weight average molecular weight of the whole polyimide precursor is from 50,000 to 130,000.
9. The polyimide shaped article according to claim 1 , wherein the common logarithm value of the surface resistivity of the outer surface of the polyimide shaped article is 8 (Log Ω/□) to 12 (Log Ω/□).
10. The polyimide shaped article according to claim 1 , wherein the polyimide shaped article consists of the thermally cured product of the polyimide precursor solution.
11. The polyimide shaped article according to claim 1 , wherein the polyimide precursor solution optionally comprises a catalyst for promoting imidization, optionally comprises a levelling agent, and optionally comprises a filler for imparting mechanical strength.
12. The polyimide shaped article according to claim 11 , wherein the polyimide shaped article consists of the thermally cured product of the polyimide precursor solution.
13. The polyimide shaped article according to claim 1 , wherein the polyimide precursor solution consists of the polyimide precursor, the solvent, the tertiary amine compound, and the conductive filler.
14. The polyimide shaped article according to claim 1 , wherein the polyimide precursor solution consists of the polyimide precursor, the solvent, the tertiary amine compound, the conductive filler, an optional catalyst for promoting imidization, an optional levelling agent, and an optional filler for imparting mechanical strength.