Alkyne Zipper Reaction for Biorenewable Polyurethane Mechanical Properties
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Solution Overview
Problem
Biorenewable polyurethane materials derived from vegetable oils often exhibit poor mechanical properties due to a low ratio of primary to secondary hydroxyl groups and an abundance of terminal aliphatic alkyl chains, necessitating dilution with non-renewable materials to achieve desired properties.
Innovation Solution
A process involving the conversion of unsaturated plant oils into alkyne-terminated triglycerides, followed by the formation of hydroxyl-terminated polyols with terminal, primary hydroxyl groups and no dangling chains, which are then polymerized with diisocyanate to create biorenewable polyurethane materials with improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If vegetable oil-based polyols are used to form polyurethanes, then biorenewability is improved, but mechanical properties deteriorate
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of polyols through the alkyne zipper reaction, which converts internal alkynes to terminal alkynes. This structural parameter change increases the ratio of primary to secondary hydroxyl groups and eliminates terminal aliphatic alkyl chains, thereby improving mechanical properties while maintaining biorenewability
Solution Approach 2:
The patent creates a composite polyurethane system by combining biorenewable polyols derived from plant oils with petroleum-based polyols. This composite approach allows the biorenewable component to provide sustainability while the petroleum-based component contributes to mechanical strength, resolving the contradiction between biorenewability and mechanical properties
2Adaptability or versatility
If vegetable oil-based polyols are used to form polyurethanes, then biorenewability is improved, but mechanical properties deteriorate due to low primary to secondary hydroxyl group ratio
Solution Approach 1:
The alkyne zipper reaction fundamentally changes the parameter of hydroxyl group distribution by converting internal alkynes to terminal alkynes, which then yield primary hydroxyl groups upon hydration. This parameter change increases the primary to secondary hydroxyl group ratio, directly addressing the manufacturing precision issue
Solution Approach 2:
The patent applies preliminary action by performing the alkyne zipper reaction and polyol synthesis before polyurethane formation. This preliminary modification of the polyol structure ensures the correct hydroxyl group ratio is established prior to polymerization, preventing the mechanical property deterioration that would otherwise occur
3Adaptability or versatility
If vegetable oil-based polyols are used to form polyurethanes, then biorenewability is improved, but mechanical properties deteriorate due to abundance of terminal aliphatic alkyl chains
Solution Approach 1:
The patent applies the taking out principle by removing terminal aliphatic alkyl chains through the alkyne zipper reaction. The reaction specifically targets and eliminates these problematic terminal chains, extracting the source of mechanical property deterioration from the polyol structure while preserving the biorenewable triglyceride backbone
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 process enhances the mechanical properties of biorenewable polyurethane materials, allowing for their use in applications such as acoustic dampening foams with reduced reliance on petroleum-based materials while meeting mechanical property standards.
Implementation Method 1
forming an alkyne-terminated triglyceride material from an unsaturated plant oil
Implementation Method 2
polymerizing a mixture that includes the hydroxyl-terminated polyol material to form a biorenewable polyurethane material
Implementation Method 3
chemically reacting the polyurethane material with a diisocyanate cross-linking material to form the biorenewable polyurethane material
Data Source
AI summary
A process of forming a polyurethane material includes forming an alkyne-terminated triglyceride material from an unsaturated plant oil. The process also includes forming a hydroxyl-terminated polyol material from the alkyne-terminated triglyceride material. The process further includes polymerizing a mixture that includes the hydroxyl-terminated polyol material to form a polyurethane material.