Extrusion & Post
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PPO Film Reactive Casting Process
Problem Phenomenon
【Problem Phenomenon】PPO film preparation process is special, and conventional casting cannot form film
Cause Analysis
PPO film needs reactive modification with maleic anhydride before casting: PPO 100 parts + maleic anhydride 1.5 parts + peroxide 1.0 parts, twin-screw reactive extrusion at 300℃, dissolved in dichloromethane and cast into film
Solution
Prepare according to the reactive extrusion-dissolution casting process route; the small amount of maleic anhydride has little effect on original performance; dielectric constant 2.5-2.6 is maintained; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PPO film follows the reactive modification casting route; direct casting does not work; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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