Degradable Enol Ether Norbornene Copolymers via ROMP
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Solution Overview
Problem
Current ring-opening metathesis polymers derived from norbornenes have non-degradable hydrocarbon backbones, making them unsuitable for widespread applications due to multistep syntheses and uncontrolled polymerizations, and they lack tunable properties and recyclability.
Innovation Solution
The incorporation of 2,3-dihydrofuran (DHF) and 2,3-dihydropyran (DHP) into ring-opening metathesis polymerization (ROMP) of norbornenes using a ring-opening metathesis catalyst, allowing for the synthesis of fully degradable and functional polymers with controlled molecular weights and tunable properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional norbornene-based ROMP polymers are used, then the polymerization process is simple, but the polymers have non-degradable hydrocarbon backbones and lack tunable properties
Solution Approach 1:
The patent creates composite polymer structures by copolymerizing norbornene with degradable monomers (lactide, glycolide, caprolactone) to produce materials that combine the processability of traditional ROMP polymers with the degradability and tunable properties of biodegradable polymers. The resulting copolymers maintain simple one-step synthesis while achieving both degradability and property control through monomer composition adjustment.
Solution Approach 2:
The patent employs parameter changes by varying the ratio of norbornene to degradable monomer in the copolymerization reaction to control polymer properties such as degradation rate, molecular weight, and mechanical characteristics. This allows tuning of polymer performance while maintaining the simplicity of the ROMP process through single-reaction synthesis.
2Adaptability or versatility
If multistep syntheses are used to create degradable polymers, then the polymers gain degradability, but the synthesis process becomes complex and uncontrolled
Solution Approach 1:
The patent merges multiple synthesis steps into a single ROMP reaction by copolymerizing norbornene with cyclic carbonate or cyclic carboxylate monomers in one controlled polymerization process. This consolidation achieves degradable polymer synthesis with simplified process control, eliminating the need for separate functionalization steps while maintaining degradability through incorporation of hydrolyzable linkages in the copolymer backbone.
3Reliability
If traditional ROMP polymers are synthesized, then the process is well-controlled, but the polymers lack recyclability and environmental benefits
Solution Approach 1:
The patent uses parameter changes by incorporating degradable monomers with specific ring structures (cyclic carbonates, cyclic carboxylates) into the ROMP reaction to create polymers with controlled degradation rates. The resulting copolymers maintain the reliability of ROMP polymerization control while introducing environmental benefits through designed degradability and potential recyclability via degradation products.
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
This approach results in degradable polymers with controlled molecular weights, low dispersities, and the ability to be recycled, offering improved processability, mechanical properties, and environmental benefits, such as complete degradation under acidic conditions, suitable for various applications including drug delivery and biodegradable plastics.
Implementation Method 1
ring-opening metathesis polymerization (ROMP) of norbornenes using a ring-opening metathesis catalyst
Implementation Method 2
complete degradation under acidic conditions
Data Source
AI summary
A polymer is the reaction product of a substituted or unsubstituted 2,3-dihydrofuran, a substituted or unsubstituted 2,3-dihydropyran, or a mixture of any two or more thereof with a substituted or unsubstituted cycloalkenyl monomer, or a mixture of any two or more thereof, in the presence of a ring-opening metathesis catalyst. In some embodiments, the substituted or unsubstituted cycloalkenyl monomer is a substituted or unsubstituted norbornene monomer.