TFE-PPVE Copolymer Composition for Thick Sheet Shape Stability
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Solution Overview
Problem
Producing thick sheets from copolymers containing tetrafluoroethylene (TFE) and perfluoro(propyl vinyl ether) (PPVE) units is challenging due to deformation issues in the molten state, leading to poor abrasion resistance, chemical solution permeability, high-temperature rigidity, and durability under repetitive loads.
Innovation Solution
Regulating the content of PPVE units between 2.4% to 3.4% by mass, melt flow rate (MFR) between 0.8 to 1.4 g/10 min, and the number of functional groups to 20 or less per 10^6 main-chain carbon atoms in the copolymer, ensuring it remains stable in the molten state and provides excellent mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the copolymer is processed to produce thick sheets, then the sheet thickness is increased, but the copolymer deforms in the molten state leading to poor manufacturing precision
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional parameters of the copolymer: PPVE unit content (2.4-3.4% by mass), melt flow rate (0.8-1.4 g/10 min at 372°C), and functional group content (20 or less per 10^6 main-chain carbon atoms). These parameter optimizations enable the copolymer to maintain shape stability in the molten state while allowing production of thick sheets with excellent manufacturing precision.
2Strength
If the copolymer composition is optimized for shape stability, then abrasion resistance and high-temperature rigidity are improved, but the processing conditions become more restrictive
Solution Approach 1:
The patent optimizes multiple parameters simultaneously within specific ranges: PPVE unit content (2.4-3.4% by mass), melt flow rate (0.8-1.4 g/10 min), and functional group content (20 or less per 10^6 main-chain carbon atoms). This multi-parameter optimization achieves excellent abrasion resistance, low chemical solution permeability, high-temperature rigidity, and durability while maintaining feasible processing conditions through controlled melt flow rate.
Data Source
AI summary
There is provided a copolymer containing tetrafluoroethylene unit and perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of perfluoro(propyl vinyl ether) unit of 2.4 to 3.48 by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 0.8 to 1.4 g/10 min, and the number of functional groups of 20 or less per 106 main-chain carbon atoms.