Star Polymer Epoxy Adhesive Additive for Impact Resistance
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Solution Overview
Problem
Epoxy resins used in structural adhesives often exhibit low fracture toughness and brittleness, limiting their impact resistance and adhesive strength, particularly in high-performance applications like automotive and aerospace industries.
Innovation Solution
Incorporating a star-shaped star polymer with a core/shell structure, formed via atomic transfer radical polymerization, into the epoxy adhesive, where the arm-polymer includes a halogenated polyacrylate and the cross-linker is a diacrylate or dimethacrylate-based compound, enhancing mechanical properties and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If epoxy resin is used as structural adhesive, then adhesion ability and heat resistance are improved, but fracture toughness and impact resistance deteriorate
Solution Approach 1:
The patent introduces a core/shell structured star polymer as an additive to the epoxy resin system. The core region provides structural integrity while the shell region enhances impact resistance and fracture toughness. This composite approach allows the adhesive to simultaneously achieve high adhesion ability and improved impact resistance, resolving the contradiction between these two properties.
2Strength
If nanoparticles are added to epoxy resin, then tensile strength and lap shear strength are improved, but processing complexity increases
Solution Approach 1:
The patent modifies the molecular structure parameters of the polymer additive by creating a core/shell structured star polymer with specific arm numbers and core/shell size ratios. By controlling these structural parameters, the additive achieves effective reinforcement of tensile and lap shear strength while maintaining compatibility with standard epoxy resin processing methods, thus avoiding excessive processing complexity.
3Strength
If block copolymer-based additive is introduced, then adhesive strength and impact-resistance are improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the polymer additive into distinct functional regions: a core region for structural support and a shell region for interface interaction. This segmentation allows each region to be optimized independently for its specific function while simplifying the overall manufacturing process compared to synthesizing complex block copolymers. The core/shell structure is achieved through controlled polymerization rather than complex multi-step synthesis.
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 star polymer improves the adhesion ability and impact resistance of the epoxy adhesive, forming a flexible brush-like shell that self-assembles within the epoxy resin, increasing wettability and mechanical properties of the cured adhesive, thus meeting the high performance requirements of automotive and aviation industries.
Implementation Method 1
the star polymer is formed via atomic transfer radical polymerization (ATRP) between an arm-polymer and a cross-linker
Implementation Method 2
forming a flexible brush-like shell that self-assembles within the epoxy resin, increasing wettability and mechanical properties
Data Source
AI summary
In an additive for an epoxy adhesive and an epoxy adhesive composition for construction including same, the additive for an epoxy adhesive is formed by atomic transfer radical polymerization (ATRP) of a polyacrylate of which one terminal is halogenated, as an arm-polymer, and a diacrylate-based compound or a dimethacrylate-based compound, as a cross-linker, and comprises a star polymer of a star-shape having a core/shell structure including a core formed by the polymerization of the cross-linker and a shell formed by a portion of the arm-polymer.