Cyclohexene Carbonate ROMP for Recyclable PVA Copolymer Control
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Solution Overview
Problem
The challenge lies in efficiently controlling ring-opening metathesis polymerization (ROMP) of cyclohexene derivatives, which have low ring strain energy, making them difficult to recycle through ring-closing metathesis (RCMD).
Innovation Solution
By incorporating trans-fused cyclic carbonate groups, the ring strain energy of cyclohexene monomers is increased, allowing for controlled ROMP and subsequent deprotection to form polyvinyl alcohol copolymers with a well-defined 1,2-diol structure. These polymers can be chemically recycled through RCMD or degraded to produce industrially useful compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cyclohexene derivatives with low ring strain energy are used as monomers, then the polymers can be chemically recycled through ring-closing metathesis, but the ring-opening metathesis polymerization cannot be efficiently controlled
Solution Approach 1:
The patent introduces trans-fused cyclic carbonate groups into cyclohexene derivatives to modulate the ring strain energy to an optimal range (6-10 kcal/mol). This parameter adjustment enables both efficient ROMP polymerization control and subsequent chemical recyclability through RCMD, resolving the contradiction between polymerization efficiency and recyclability
Solution Approach 2:
The patent creates composite monomer structures by fusing cyclic carbonate groups onto the cyclohexene ring system. This composite structure combines the low ring strain energy of cyclohexene (for recyclability) with the ring strain enhancement from carbonate groups (for polymerization control), achieving both objectives simultaneously
2Productivity
If trans-fused cyclic carbonate groups are introduced to increase ring strain energy, then ROMP can be efficiently controlled, but the structural complexity of monomers increases
Solution Approach 1:
The patent applies local functionalization by introducing carbonate groups at specific positions on the cyclohexene ring (positions 3,4 or 4,5). This localized modification achieves the desired ring strain energy enhancement without requiring complete structural redesign of the entire monomer molecule, thus limiting the increase in overall complexity
3Reliability
If cyclohexene derivatives are used as monomers, then the polymers exhibit high hydrolytic stability and oxygen protective properties, but the ROMP polymerization is difficult to control
Solution Approach 1:
The patent precisely tunes the ring strain energy parameter of cyclohexene derivatives by introducing trans-fused cyclic carbonate groups, achieving an optimal range (6-10 kcal/mol) that enables controlled ROMP while preserving the inherent hydrolytic stability and oxygen barrier properties of the cyclohexene-based polymer 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 approach enables the production of polyvinyl alcohol copolymers with high hydrolytic stability, excellent oxygen protective properties, and processability, while also facilitating closed-loop recycling and the generation of valuable chemical feedstocks.
Implementation Method 1
the ring strain energy of cyclohexene monomers is increased using trans-fused cyclic carbonate groups to perform ring-opening metathesis polymerization (ROMP)
Implementation Method 2
ring-opening metathesis polymerization (ROMP) of cyclohexene derivatives
Implementation Method 3
subsequent deprotection to form polyvinyl alcohol copolymers with a well-defined 1,2-diol structure
Implementation Method 4
These polymers can be chemically recycled through RCMD
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
The present invention relates to a method for producing a chemically recyclable polyvinyl alcohol copolymer through ring-opening metathesis polymerization of cyclohexene derivatives, wherein the ring strain energy of cyclohexene monomers is increased using trans-fused cyclic carbonate groups to perform ring-opening metathesis polymerization (ROMP) while efficiently controlling same to produce a polyvinyl alcohol copolymer with a well-defined structure of 1,2-diol per six carbon atoms and exhibiting high hydrolytic stability, excellent oxygen protective properties, and processability. In addition, the polyvinyl alcohol copolymer can be chemically recycled into 1,2-diol containing cyclohexene through the ring-closing metathesis of the polyvinyl alcohol polymer, and useful compounds, including industrially useful α,ω-dialdehyde compounds, can be produced by chemically cleaving 1,2-diol groups.