Comparison of Different Methods for Determining the Imidization Degree of Polyimide Fibers下线服务迁移在这研究,在 imidization 的不同阶段的 polyimide 纤维被 TGA, DSC,和 FTIR 描绘。TGA 计算的 imidization 度(标志) 基于每件样品的重量损失,它被剩余 amic 酸组的 imidization 引起。TGA 的结果与 PI 纤维的...
Xu Y, Wang S, Li Z, Xu Q and Zhang Q, Polyimide fibers prepared by dry-spinning process: imidization degree and mechanical properties, Journal of Materials Science, 48, 2013, pp. 63-68.Polyimide fibers prepared by dry-spinningprocess:imidization degree and mechanical properties. Xu Y,Wang ...
Later, a new method for the determination of the imidization degree (ID) was proposed by in situ infrared spectroscopy, and it was inferred that the traditional method for ID calculation is no longer applicable to PI precursors with aromatic base. The ID and the kinetics of thermal imidization...
The effects of the imidization degree, postimidization, and solvent on the thermal and mechanical properties of PI films were quantitatively investigated. The corresponding structural changes were also examined. The experimental results showed that the imidization process proceeded more quickly and more ...
PROBLEM TO BE SOLVED: To obtain an evaluating device for an imidization degree having high productivity and reliability so that the uniformity of imidization degree in orienting films can be evaluated in the production line by evaluating the luminance level and distribution of an output image from ...
The imidization effect of a poly(amic acid) dope solution on membrane formation has been investigated. Poly(amic acid) solution in N-methyl-2-pyrrolidione has been thermally imidized at 120°C at different curing times. The degree of imidization was determined by infrared spectroscopy. The sol...
Isothermal imidization of an aromatic polyimide (PI) precursor, poly(amic acid) (PAA) derived from biphenyltetracarboxylic dianhydride (BPDA) and-phenylene diamine (PDA) was studied in solution and the solid state using intermolecular charge-transfer (CT) fluorescence reflecting sensitively the degree ...
An investigation was made of the influence of laser radiation on the degree of\ncompletion of the imidization of a polyamide acid, prepared from dianhydride ofpyromellitic acid and 4,4''-diaminodiphenyl ester in dimethylformamide. The in... GA Kyulyan - 《Soviet Journal of Quantum Electronics》...
The degree of in-plane orientation is larger around the air/film interface than the film/substrate interface. Factors which contribute to increase in average refractive index are solvent evaporation, thermal imidization and dense packing during heating. Solvent evaporation is dominant for curing at ...
Results reveal that C60 affects the degree of order of the composite in the molecular direction, giving rise to slightly smaller crystals than those found in pure polyamic acid. The difference in the SAXS data between the pure PAA and the composite are discussed through the interaction of C60 ...