Heterocycle-Functionalized Phthalonitrile Monomers for Processable Thermosets
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Solution Overview
Problem
State-of-the-art phthalonitrile monomers suffer from brittleness, high melting points, and require high curing temperatures, limiting their processability and flexibility in applications.
Innovation Solution
Development of functionalized phthalonitrile monomers derived from polyhydric phenols with furan or thiophene groups and 4-nitrophthalonitrile, which can be cured to form thermoset polymers with improved thermal and mechanical properties, and are compatible with other unsaturated thermoset resins for enhanced processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If state-of-the-art phthalonitrile monomers are used, then thermal stability and flame resistance are improved, but brittleness increases and processability deteriorates
Solution Approach 1:
The patent modifies the chemical structure of phthalonitrile monomers by changing parameters such as introducing different aromatic rings, heterocyclic groups, and substituent patterns. This structural parameter changes reduce the rigidity of the monomeric precursors while maintaining thermal stability, thereby improving processability without sacrificing reliability
Solution Approach 2:
The patent creates composite monomer structures by combining phthalonitrile core with various functional groups and aromatic systems. These composite structures balance the rigidity needed for thermal stability with flexible linkers that improve processability and reduce brittleness in the cured product
2Reliability
If high cross-linking density is achieved in cured product, then thermal performance is improved, but brittleness increases
Solution Approach 1:
The patent introduces local structural variations within the polymer network by using monomers with different functional group distributions and chain lengths. This creates regions of varying cross-linking density, where highly cross-linked regions provide thermal performance while less dense regions maintain flexibility and reduce overall brittleness
Solution Approach 2:
By changing the parameters of the monomer structure such as introducing flexible spacer groups, varying the number and position of reactive functional groups, and modifying aromatic ring systems, the patent achieves optimal balance between cross-linking density for thermal performance and structural flexibility to prevent brittleness
3Reliability
If high melting point monomers are used, then thermal resistance is improved, but melting and processing become more difficult
Solution Approach 1:
The patent modifies molecular parameters such as symmetry, packing efficiency, and intermolecular interaction strengths by changing the monomer structure. This reduces the melting point to improve processability while maintaining thermal resistance through preserved aromatic core structures and optimized cross-linking chemistry
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The functionalized phthalonitrile monomers exhibit improved thermal stability, heat resistance, char yield, and structural rigidity, with a balanced set of physical and mechanical properties in both uncured and cured states, suitable for various industrial applications.
Implementation Method 1
functionalized phthalonitrile monomer obtained from the reaction of (i) a polyhydric phenol compound comprising at least one furan group or thiophene group and (ii) 4-nitrophthalonitrile
Implementation Method 2
The thermosetting compositions of the present disclosure may be cured to form thermoset polymers
Data Source
AI summary
The present disclosure provides a functionalized phthalonitrile monomer derived from a polyhydric phenol comprising at least one furan group or thiophene group and 4-nitrophthalonitrile. The functionalized phthalonitrile monomer may be used in various thermosetting compositions which can be cured to form thermoset polymers having excellent thermal and mechanical properties, such as high thermal stability, heat resistance, high char yield, and enhanced structural rigidity.