RAFT Polymerization of Triglycerides for Thermoplastic Elastomers
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Solution Overview
Problem
Conventional polymerization routes for vegetable oils often result in uncontrolled chain branching and crosslinking, leading to thermoset materials rather than processable thermoplastic elastomers, which are needed for various industrial applications.
Innovation Solution
The application of reversible addition-fragmentation chain transfer (RAFT) polymerization to vegetable oils like soybean oil, allowing for the design of non-crosslinked linear or lightly branched thermoplastic polymers with controlled molecular architecture, preventing gelation and enabling the production of thermoplastic block copolymers and homopolymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional polymerization routes are used for vegetable oils, then polymerization occurs, but uncontrolled chain branching and crosslinking results in thermoset materials rather than thermoplastic elastomers
Solution Approach 1:
The patent introduces a chain transfer agent (CTA) as an intermediary substance in the polymerization process. The CTA mediates the polymerization reaction by controlling chain growth and preventing uncontrolled crosslinking, thereby producing thermoplastic elastomers with desired molecular architecture from vegetable oil monomers.
Solution Approach 2:
The patent changes the polymerization parameters by using reversible addition-fragmentation chain transfer (RAFT) polymerization instead of conventional free radical polymerization. This parameter change enables controlled molecular weight and architecture while preventing gelation, transforming the outcome from thermoset to thermoplastic elastomer.
2Productivity
If conventional polymerization is applied to vegetable oils, then polymer production is achieved, but gelation occurs preventing thermoplastic processing
Solution Approach 1:
The chain transfer agent serves as a mediator that controls the polymerization process to prevent gelation. By regulating chain growth and molecular weight distribution, the CTA enables production of thermoplastic elastomers that can be processed while maintaining high productivity.
Solution Approach 2:
The patent uses excess chain transfer agent relative to conventional polymerization to ensure complete control over the polymerization process. This excessive action of the CTA prevents any gelation while maintaining high monomer conversion and productivity.
3Strength
If traditional polymerization methods are used, then crosslinked thermoset materials are formed, but this prevents further processing and application in thermoplastic forms
Solution Approach 1:
The patent changes the fundamental polymerization mechanism from conventional free radical to RAFT polymerization. This parameter change produces thermoplastic elastomers with controlled molecular architecture that maintain desirable material properties while enabling processing and application in various thermoplastic forms.
Solution Approach 2:
The patent creates dynamic molecular architecture through controlled block copolymer structures. The use of CTA enables formation of well-defined blocks and architectures that can be further processed and adapted for different applications, providing versatility while maintaining strength.
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 produces cost-effective, environmentally friendly thermoplastic polymers with elastomeric properties competitive with synthetic rubbers, suitable for applications such as asphalt modifiers, adhesives, and consumer products, while avoiding the gelation issues of traditional methods.
Implementation Method 1
reversible addition-fragmentation chain transfer polymerization (RAFT) for making novel thermoplastic homopolymers, thermoplastic elastomeric block copolymers, and thermoplastic elastomeric statistical copolymers
Data Source
AI summary
The present invention relates to a thermoplastic block copolymer comprising at least one PA block and at least one PB block. The PA block represents a polymer block comprising one or more units of monomer A, and the PB block represents a polymer block comprising one or more units of monomer B. Monomer A is a vinyl, acrylic, diolefin, nitrile, dinitrile, acrylonitrile monomer, a monomer with reactive functionality, or a crosslinking monomer. Monomer B is a radically polymerizable triglyceride or mixtures thereof, typically in the form of a plant or animal oil. The present invention also relates to a method of preparing a thermoplastic block copolymer or novel thermoplastic statistical copolymers by polymerizing a radically polymerizable monomer with a radically polymerizable triglyceride or mixtures thereof via reversible addition-fragmentation chain-transfer polymerization (RAFT), in the presence of an free radical initiator and a chain transfer agent.