Bi-functionalized Dicyclopentadiene Monomer for Recyclable Polymers
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Solution Overview
Problem
Crosslinked polydicyclopentadiene (PDCPD) is limited by its unpleasant odor, complex chemical structure, lack of recyclability, low surface energy, and inability to be chemically tuned, which restricts its broader application in industries requiring varied material properties.
Innovation Solution
Development of bi-functionalized dicyclopentadiene monomers and polymers with specific functional groups that can participate in polymerization and crosslinking, allowing for tuning of bulk mechanical properties and enabling efficient regioselective synthesis using low-cost reagents, and reversible crosslinking for recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional unfunctionalized dicyclopentadiene is used for polymerization, then the polymer exhibits high impact resistance and chemical corrosion resistance, but the polymer has unpleasant odor, low surface energy, and lack of chemical tunability
Solution Approach 1:
The patent introduces functional groups (such as hydroxyl, carboxyl, amino groups) at specific positions on the dicyclopentadiene monomer structure, transforming the unfunctionalized monomer into a functionalized variant. This parameter change in molecular structure enables chemical tunability while the functional groups can also mask or reduce the unpleasant odor through chemical modification of the monomer's volatile components
Solution Approach 2:
The patent creates functionalized dicyclopentadiene monomers that combine the core dicyclopentadiene structure with additional functional moieties. This composite approach maintains the beneficial mechanical properties of PDCPD while adding desirable characteristics such as improved surface energy, reduced odor, and chemical tunability through the integrated functional groups
2Strength
If crosslinked PDCPD is produced to achieve high strength and heat resistance, then the material exhibits high tensile strength and heat deflection temperature, but the material loses recyclability
Solution Approach 1:
The patent employs dynamic covalent chemistry with reversible crosslinking mechanisms that allow the crosslinked network to be reconfigured under specific conditions. By changing parameters such as temperature, pH, or applying stimuli, the crosslinks can be broken and reformed, enabling recyclability while maintaining high strength during service. The functional groups introduced in the monomer facilitate this reversible behavior
Solution Approach 2:
The patent introduces dynamic and reversible crosslinking mechanisms that allow the material to transition between crosslinked and uncrosslinked states. This dynamic behavior enables the material to maintain structural integrity and high strength during use, while allowing for reprocessing and recycling when needed by reversing the crosslinking through controlled conditions
3Temperature
If traditional PDCPD is used to achieve high heat deflection temperature, then the material exhibits high thermal stability, but the material has low surface energy making it difficult to paint or apply adhesives
Solution Approach 1:
The patent introduces polar functional groups (hydroxyl, carboxyl, amino groups) onto the dicyclopentadiene monomer structure. These functional groups increase the surface energy of the polymer by creating polar interactions at the surface, improving wetting and adhesion properties for paints and adhesives, while the bulk thermal stability is maintained through the robust polymer backbone structure
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 bi-functionalized polymers exhibit improved thermal stability, tunable properties, and recyclability, overcoming the limitations of traditional PDCPD and offering enhanced performance in applications such as ballistic armor and aerospace materials.
Implementation Method 1
Polydicyclopentadiene (PDCPD) is a crosslinked organic polymer produced by ring-opening metathesis polymerization (ROMP) from dicyclopentadiene
Implementation Method 2
bi-functionalized dicyclopentadiene monomer and polymer embodiments, as well as method embodiments for making and using the same
Data Source
AI summary
Disclosed herein are embodiments of a bi-functionalized dicyclopentadiene monomer and polymer embodiments formed therefrom. The monomer embodiments exhibit tunability and can be used to form thermally stable homopolymers, copolymers, and/or crosslinked polymers.