Semicrystalline Poly(aryl ether ketone) with Phthalazinone

The patent applies parameter changes by carefully controlling the glass transition temperature (Tg) to be above 180°C and melting temperature (Tm) to be above 300°C through specific polymer composition design. This allows the polymer to achieve high temperature resistance while maintaining melt processability, as the parameters are optimized to balance thermal stability with processing requirements.

The patent uses composite materials by incorporating multiple aromatic monomer units including hydroquinone, 4,4'-biphenol, and other substituted phenols to create a copolymer structure. This composite approach allows tuning of both Tg and Tm to achieve the desired balance between high temperature resistance and melt processability, avoiding the extremes that would make the material non-processable or brittle.

The patent optimizes the mechanical properties by controlling the Tg to be above 180°C but not excessively high, and Tm above 300°C. This parameter optimization ensures the polymer maintains flexibility and toughness at operating temperatures while providing sufficient thermal stability, avoiding the brittleness that would result from extreme thermal parameters.

The patent employs a composite polymer structure incorporating multiple aromatic monomers (hydroquinone, 4,4'-biphenol, and other substituted phenols) to achieve a balanced microstructure. This composite approach provides both the thermal stability needed for high Tg and Tm, and the structural flexibility required for good mechanical properties, preventing brittleness.

The patent carefully controls the degree of crystallinity as a parameter to balance chemical resistance with thermal properties. By optimizing Tg above 180°C and Tm above 300°C along with appropriate crystallinity levels, the polymer achieves high temperature resistance while maintaining sufficient chemical resistance, preventing the complete loss of solvent barrier properties.

The patent uses a composite polymer structure with multiple aromatic monomers to create a semi-crystalline morphology. This composite approach allows the material to maintain crystalline regions that provide chemical resistance while having amorphous regions that accommodate the high Tg and Tm requirements, achieving a balance between chemical and thermal performance.