Non-Isocyanate Polyurethane Synthesis via Cyclic Carbonates
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Solution Overview
Problem
Conventional polyurethane synthesis methods rely on isocyanates, which are toxic and pose environmental hazards, necessitating the development of non-isocyanate routes and functionalization with atoms like fluorine, phosphorus, and sulfur to create materials with diverse applications.
Innovation Solution
A non-isocyanate route involving the reaction of cyclic carbonates with diamines to form urethanes, followed by methacrylation and functionalization with fluorine, phosphorus, sulfur, or unsaturated carboxylic acids to produce fluorinated non-isocyanate urethane dimethacrylate resins, which can be used in various applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional polyurethane synthesis using isocyanates is employed, then polyurethane polymers can be formed effectively, but severe toxicity issues and environmental hazards arise
Solution Approach 1:
The patent removes isocyanates from the polyurethane synthesis process entirely, replacing them with non-isocyanate compounds such as cyclic carbonates and diamines. This extraction of the harmful substance while maintaining the core polyurethane formation capability directly resolves the contradiction between manufacturing effectiveness and toxicity reduction.
Solution Approach 2:
The patent introduces non-isocyanate compounds (cyclic carbonates and diamines) as intermediary substances to achieve polyurethane synthesis without using toxic isocyanates. These intermediaries serve as safe alternatives that produce the desired polyurethane polymers without the harmful byproducts associated with conventional isocyanate-based methods.
2Adaptability or versatility
If polyurethanes are functionalized with additional atoms (fluorine, phosphorus, sulfur), then a range of properties are achieved for diverse applications, but the synthesis process becomes more complex
Solution Approach 1:
The patent combines multiple functions into a single synthesis approach by using non-isocyanate polyurethane formation that can simultaneously incorporate functional groups containing fluorine, phosphorus, or sulfur atoms. This merging of base polymer formation with functionalization reduces the need for separate complex synthesis steps.
Solution Approach 2:
The patent creates a universal non-isocyanate synthesis platform that can produce polyurethanes with various functional properties (flame retardancy, moisture uptake, abrasion resistance) through a single methodology. The use of diamines and cyclic carbonates provides a multi-functional base that can be adapted to create different functionalized polyurethanes without requiring entirely different synthesis routes.
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 eliminates the use of toxic isocyanates, offering a safer and more versatile synthesis method for polyurethanes with enhanced properties such as flame retardancy, moisture uptake, and abrasion resistance, suitable for coatings and dental applications.
Implementation Method 1
reacting a cyclic carbonate with a diamine to form a urethane
Implementation Method 2
reacting the urethane with a methacrylate to form a non-isocyanate urethane methacrylate
Implementation Method 3
functionalizing the non-isocyanate urethane methacrylate with a molecule that contains fluorine atoms
Data Source
AI summary
Disclosed herein a composition comprising a urethane of the FIG. 3; where hydroxyl or amine linkages on the urethane of the FIG. 3 are functionalized with molecules that contain fluorine atoms, phosphorus atoms, sulfur atoms, unsaturated carboxylic acids, derivatives of unsaturated carboxylic acids, or combinations thereof. Disclosed herein too is a composition comprising a urethane of the FIG. 3; where hydroxyl or amine linkages of the urethane of the FIG. 3 are functionalized with molecules that contain fluorine atoms, phosphorus atoms, sulfur atoms, unsaturated carboxylic acids, derivatives of unsaturated carboxylic acids, or combinations thereof; and a polymeric resin.