TPA-Based Polyester Compositions for Tough, High-Tg 3D Objects
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Solution Overview
Problem
Existing thermosetting materials for additive fabrication struggle to achieve a high glass transition temperature (Tg) and high toughness simultaneously.
Innovation Solution
A thermosetting composition comprising a TPA-based polyester with a backbone formed from terephthalic acid and a polyol, having at least two polymerizable groups, is used in a first network-forming component, along with first and second network-forming components to create three-dimensional objects via additive fabrication, where the TPA-based polyester has a glass transition temperature of 40°C or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional thermosetting materials are used in additive fabrication, then the material can be cured to form three-dimensional objects, but the mechanical properties (specifically the combination of high glass transition temperature and high toughness) cannot be simultaneously achieved
Solution Approach 1:
The patent employs a composite material system consisting of a polyester backbone derived from terephthalic acid and polyol, combined with multiple types of polymerizable groups (acrylate, methacrylate, epoxy, oxetane, vinyl ether, allyl ether, itaconate, maleate, or fumarate). This composite structure enables the material to achieve both high glass transition temperature (40°C or more) and high toughness simultaneously, resolving the technical contradiction between thermal stability and mechanical flexibility.
Solution Approach 2:
The patent systematically adjusts critical parameters including the number average molecular weight of the polyester (800 to 10,000 g/mol), the ratio of polymerizable groups to backbone units, and the specific combination of polymerizable group types. By optimizing these parameters, the material achieves the desired balance between glass transition temperature and toughness, transforming the conventional trade-off into a controllable design space.
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 a high glass transition temperature and high toughness, enhancing the mechanical properties of the resulting three-dimensional objects.
Implementation Method 1
electromagnetic radiation is used to encourage rapid curing of the thermosetting materials. The electromagnetic radiation may be UV, visible, or infrared light and may be applied, for example, by lasers, lamps, or LEDs.
Data Source
AI summary
Thermoset compositions and methods for forming three-dimensional articles via an additive fabrication process, and articles made therefrom are disclosed herein. In an embodiment, a composition comprises a first network-forming component comprising a TPA-based polyester comprising a backbone and having at least 2 polymerizable groups, one or more first network monomers, and a first network initiator. The backbone of the TPA-based polyester comprises the reaction product of a terephthalic acid and a polyol. The composition may further comprise a second network-forming component.