A high temperature resistant melt processable polyetherimide and method of making the same
Polyetherimides containing thioether structures were prepared by solution polycondensation and controlled oxidation, solving the problem of easy softening of thermoplastic resins at high temperatures and achieving a balance between high heat resistance and good processability, thus obtaining high-performance polyetherimide resins.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SICHUAN UNIV
- Filing Date
- 2024-11-07
- Publication Date
- 2026-06-12
AI Technical Summary
Existing thermoplastic resins are prone to softening under high-temperature service conditions, making it difficult to balance heat resistance and melt processability, and there is a lack of effective control methods.
Polyetherimides containing thioether structures were prepared by solution polycondensation. By controlling the amount and temperature of the oxidant and combining it with aprotic solvents and phase separation technology, polyetherimides with high glass transition temperatures were prepared.
A polyetherimide resin with high glass transition temperature, good melt processability, and high mechanical strength was obtained. The process is simple, the cost is low, and the performance is controllable.
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Figure CN119241840B_ABST
Abstract
Claims
1. A method for preparing a high-temperature resistant, melt-processable polyetherimide, characterized in that, The preparation method is as follows: The polyetherimide resin containing a sulfide structure as shown in Formula II, an aprotic solvent, and an oxidant are stirred and reacted at 10–80°C for 1–72 h; then, crude resin is precipitated through a non-solvent; the crude resin is then filtered, washed, and dried to obtain the high-temperature resistant, melt-processable polyetherimide; the actual oxidizing component of the oxidant accounts for 1–25 wt% of the mass of the polyetherimide resin containing a sulfide structure as shown in Formula II. Formula II Where n = 5 to 200, 0.2 <x≤0.7; R1= , , , , , , , or At least one of them; R2= 。 2. The method for preparing a high-temperature resistant, melt-processable polyetherimide according to claim 1, characterized in that, The aprotic solvent is any one of m-cresol, o-dichlorobenzene, N-methylpyrrolidone, N,N-dimethylformamide, N,N-diethylacetamide, or sulfolane.
3. The method for preparing a high-temperature resistant, melt-processable polyetherimide according to claim 1 or 2, characterized in that, The oxidant is at least one of hydrogen peroxide, concentrated sulfuric acid, nitric acid, formic acid, acetic acid, peracetic acid, ammonium persulfate aqueous solution, or sodium hypochlorite aqueous solution.