Polyolefin Activation for Additive Manufacturing Adhesion
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Solution Overview
Problem
In additive manufacturing using material extrusion, higher molecular weight polyolefins exhibit high viscosity and poor inter-layer adhesion, leading to reduced mechanical resistance in printed articles, while lower molecular weight polymers show good chain diffusion but result in parts with low mechanical performance and significant shrinkage due to crystallization.
Innovation Solution
Incorporating activating agents that react with the polymer component to form crosslinks and branches, enhancing mechanical properties, and controlling activation through temperature, radiation, and post-treatment to improve dimensional stability and adhesion between layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If higher molecular weight polyolefins are used in material extrusion, then mechanical properties of the polymer are improved, but viscosity increases and inter-layer adhesion deteriorates
Solution Approach 1:
The patent changes the molecular weight parameter of the polyolefin from high to lower molecular weight to reduce viscosity and improve inter-layer adhesion during material extrusion, while compensating for mechanical properties through other means such as blending or additives
Solution Approach 2:
The patent uses composite material approaches by blending lower molecular weight polyolefin with other polymers or additives to achieve the desired balance between processability (low viscosity, good adhesion) and mechanical properties
2Object-generated harmful factors
If lower molecular weight polyolefins are used in material extrusion, then chain diffusion and inter-layer adhesion are improved, but mechanical performance and dimensional stability deteriorate due to crystallization shrinkage
Solution Approach 1:
The patent optimizes the molecular weight parameter to a specific lower range that provides sufficient chain diffusion and adhesion while minimizing crystallization shrinkage, and may use molecular weight distribution control to balance these properties
Solution Approach 2:
The patent may use localized modifications such as additives or blending strategies that specifically address the shrinkage issue in critical areas while maintaining the low molecular weight benefits for adhesion
3Ease of manufacture
If polyolefin composition is optimized for material extrusion, then processability is improved, but inter-layer adhesion and mechanical resistance are reduced
Solution Approach 1:
The patent adjusts the molecular weight parameter to lower values to improve processability during material extrusion, while using compensating strategies such as polymer blending, additives, or processing parameter optimization to maintain inter-layer adhesion and mechanical resistance
Solution Approach 2:
The patent employs composite material strategies by creating polyolefin blends or composite formulations that combine lower molecular weight polyolefin with other components to achieve both good processability and adequate mechanical performance
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 approach improves the mechanical properties and dimensional stability of printed articles, reducing warpage and shrinkage, and enhancing the overall performance of polyolefin-based materials in additive manufacturing.
Implementation Method 1
melting a polymer composition
Implementation Method 2
activating the polymer composition with one or more activating agents
Implementation Method 3
depositing the molten polymer composition
Implementation Method 4
additional layers are sequentially deposited and fused (or partially fused) to the previous layer by solidification due to a drop in temperature
Data Source
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AI summary
A method of manufacturing an article using an additive manufacturing technique may include melting a polymer composition including at least one of polyethylene and a random polypropylene copolymer; activating the polymer composition with one or more activating agents; and depositing the molten polymer composition to manufacture the article. An article may include a plurality of printed layers of a polyolefin composition including at least one of polyethylene and a random polypropylene copolymer, wherein the polyolefin composition is prepared from the deposition of an activated polyolefin composition, wherein the polyolefin composition is activated by one or more activating agents.