Polyimide-based copolymer and polyimide-based film comprising the same
A technology of polyimide and copolymer, applied in the field of polyimide-based copolymer and polyimide-based film containing it, can solve the problems of film deformation, reduction of economic efficiency, increase of cost, etc.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example 1
[0113] 6.766 g (2.113 equiv, 0.02113 mol) 2,2'-bis(trifluoromethyl)benzidine (TMFB), 15.562 g (2.99 equiv, 0.0299 mol) 4,4'-bisphenol dianhydride (BPADA) and 150 ml of N-methylpyrrolidone (NMP) was added to a 500 mL round bottom flask equipped with a Dean-Stark apparatus and condenser, and the mixture was stirred at room temperature. Thereafter, 1.042 g (0.897 equivalent, 0.00897 mol) of hexamethylenediamine (HMDA) was dissolved in 16 ml of N-methylpyrrolidone (NMP), and then slowly dropped into the flask. After the addition of hexamethylenediamine (HMDA), the reaction mixture was stirred at room temperature for 4 hours under nitrogen atmosphere for reaction.
[0114] After the reaction, a polyamic acid polymer is formed. Then, the reaction mixture was combined with 3.170 g (0.99 equiv, 0.0099 mol) 2,2'-bis(trifluoromethyl)benzidine, 2.051 g (1.01 equiv, 0.010 mol) terephthaloyl dichloride (TPC) and 36 ml of additional N-methylpyrrolidone (NMP) was mixed and then stirred in ...
Embodiment 1
[0149] The polyimide-based copolymer obtained in Preparation Example 1 was dissolved in dimethylacetamide to prepare a polymer solution of about 20 (weight / volume). Pour the polymer solution on a glass plate, adjust the thickness of the polymer solution uniformly using a film applicator, and dry it in a vacuum oven at 20 °C for 12 hours or more to obtain a thickness of 20 μm to 30 μm. Polyimide based film.
experiment example 1
[0153] The following properties of the films of Example 1 and Comparative Examples 1 to 3 were evaluated by the following methods, and the results are shown in Table 1.
[0154] 1) Evaluation of water absorption (%)
[0155] The polyimide-based film was stored in a thermo-hygrostat at 85%±2% and 85°C±2°C for 15 hours, and then left to stand at room temperature to measure the weight change (water absorption) over time . The results are shown in Table 1 and figure 2 middle.
[0156] 2) Evaluation of glass transition temperature (Tg, °C)
[0157] Loss modulus of polyimide-based films was measured at 330°C under conditions of strain of 0.1%±0.005%, force of 0.05±0.0005, and frequency of 1±0.01 Hz. The glass transition temperature was measured by the temperature of the peak of the measured loss modulus, and the results are shown in Table 1 and image 3 middle.
[0158] [Table 1]
[0159] index Water absorption (%) Glass transition temperature (℃) Example ...
PUM
| Property | Measurement | Unit |
|---|---|---|
| glass transition temperature | aaaaa | aaaaa |
| water absorption | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More