Acrylic Copolymers With Segmented Crosslinkable Monomers
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Solution Overview
Problem
Existing acrylic copolymers used in adhesives and elastomers face challenges such as high viscosity, high solvent usage, and inadequate control over polymer architecture, which affects their performance and processing efficiency.
Innovation Solution
The development of acrylic copolymers with controlled placement of crosslinkable monomers using controlled radical polymerization techniques, allowing for the creation of reactive and non-reactive segments with specific sizes and positions, resulting in low viscosity, high solids solutions that can be processed into high-performance elastomers and adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high molecular weight and cross-linking reactions are used to meet performance characteristics, then strength and durability are improved, but viscosity increases and processing becomes difficult
Solution Approach 1:
The polymer is divided into distinct reactive segments containing crosslinkable functional groups and non-reactive segments providing viscoelastic properties. This segmentation allows the crosslinkable groups to be positioned at specific locations (typically chain ends or periodic intervals) rather than being distributed throughout the entire polymer structure, enabling controlled crosslinking that achieves strength without excessive viscosity buildup during processing
Solution Approach 2:
Crosslinkable functional groups are placed locally at specific positions within the polymer chain (e.g., at chain ends or at controlled intervals along the backbone) rather than uniformly distributed. This local concentration of reactivity allows crosslinking to occur at predetermined locations, achieving the desired strength and network formation while maintaining processability of the un-crosslinked polymer
2Ease of manufacture
If large amounts of organic solvents are used for processing, then ease of processing is improved, but energy consumption and environmental impact increase
Solution Approach 1:
The invention changes the molecular weight parameter of the polymer to a moderate range that balances processability with performance. By controlling molecular weight and using segmented architecture with positioned crosslinkable groups, the polymer achieves adequate strength without requiring high molecular weight, thereby reducing the need for large amounts of solvent during processing while still meeting performance requirements
3Manufacturing precision
If block copolymer architecture is used, then molecular weight control is improved, but melt viscosity increases and reactivity control becomes difficult
Solution Approach 1:
The polymer is divided into distinct reactive segments containing crosslinkable functional groups and non-reactive segments providing viscoelastic properties. This segmentation allows the crosslinkable groups to be positioned at specific locations (typically chain ends or periodic intervals) rather than being distributed throughout the entire polymer structure, enabling controlled crosslinking that achieves strength without excessive viscosity buildup during processing
Solution Approach 2:
Crosslinkable functional groups are placed locally at specific positions within the polymer chain (e.g., at chain ends or at controlled intervals along the backbone) rather than uniformly distributed. This local concentration of reactivity allows crosslinking to occur at predetermined locations, achieving the desired strength and network formation while maintaining processability of the un-crosslinked polymer
4Strength
If telechelic polymer architecture is used, then strength is improved, but viscoelastic properties required for adhesives are lost
Solution Approach 1:
Crosslinkable functional groups are placed locally at specific positions within the polymer chain (e.g., at chain ends or at controlled intervals along the backbone) rather than uniformly distributed. This local concentration of reactivity allows crosslinking to occur at predetermined locations, achieving the desired strength and network formation while maintaining processability of the un-crosslinked polymer
Solution Approach 2:
The polymer combines two distinct functional segments: reactive segments with crosslinkable groups that provide strength through crosslinking, and non-reactive segments that provide the necessary viscoelastic properties for adhesive performance. This composite architecture allows both strength and viscoelasticity to coexist in the final material
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 enables the production of high-performance pressure-sensitive adhesives with enhanced balance between cohesion and adhesion, while also reducing the need for organic solvents and improving processing efficiency.
Implementation Method 1
it is necessary to employ a controlled free-radical polymerization technique
Implementation Method 2
State of the art (meth)acrylic copolymers meet many performance characteristics by virtue of their high molecular weight and cross-linking reactions
Data Source
AI summary
Acrylic copolymers that include the controlled placement of functional groups within the polymer structure are provided. The copolymers contain a reactive segment and a non-reactive segment and are manufactured via a controlled radical polymerization process. The copolymers are useful in the manufacture of adhesives and elastomers.