Polyrotaxane Photo-Curable Composition for Stereolithography Toughness
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Solution Overview
Problem
Existing three-dimensional-forming photo-curable compositions used in stereolithography lack sufficient toughness, despite achieving high strength and rigidity, due to excessive crosslinking density leading to brittleness.
Innovation Solution
A photo-curable composition comprising a (meth)acrylic compound, a photo-radical generator, and a polyrotaxane with cyclic molecules having (meth)acryloyl or hydroxyl groups, which allows for movable crosslinking points upon curing, enhancing toughness by distributing stress uniformly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a photo-curable composition with high crosslinking density is used to achieve high strength and rigidity, then strength and rigidity are improved, but toughness deteriorates due to brittleness
Solution Approach 1:
The patent introduces movable crosslinking points that can dynamically reposition under stress. The polyrotaxane structure allows cyclic molecules to slide along the axis, enabling crosslinking points to move and redistribute stress uniformly throughout the material, preventing stress concentration that leads to brittle failure while maintaining the high crosslinking density needed for strength and rigidity
Solution Approach 2:
The patent creates a composite structure combining polyrotaxane with (meth)acrylic compounds. The polyrotaxane provides movable crosslinking capability while the (meth)acrylic compound forms the base polymer network, creating a multi-functional composite material that simultaneously achieves high strength, rigidity, and toughness
2Strength
If crosslinking density is increased to improve mechanical strength, then rigidity is improved, but the material becomes more brittle and less tough
Solution Approach 1:
The patent introduces movable crosslinking points that can dynamically reposition under stress. The polyrotaxane structure allows cyclic molecules to slide along the axis, enabling crosslinking points to move and redistribute stress uniformly throughout the material, preventing stress concentration that leads to brittle failure while maintaining the high crosslinking density needed for strength and rigidity
Solution Approach 2:
The patent changes the fundamental parameter of crosslinking point mobility. Instead of fixed crosslinking points, the polyrotaxane structure provides movable crosslinking points that can change position in response to applied stress, fundamentally altering how the material responds to mechanical loads and enabling simultaneous achievement of rigidity and toughness
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 composition achieves higher toughness in the resulting three-dimensional articles by allowing crosslinking points to move under stress, thereby improving the mechanical properties compared to traditional compositions.
Implementation Method 1
a photo-radical generator; and a polyrotaxane having a plurality of cyclic molecules having at least one of a (meth)acryloyl group and a hydroxyl group
Data Source
AI summary
A three-dimensional-forming photo-curable composition includes a (meth)acrylic compound having a (meth)acryloyl group; a photo-radical generator; and a polyrotaxane having a plurality of cyclic molecules having at least one of a (meth)acryloyl group and a hydroxyl group.