Bio-derived Polyimide with Ester Bonds for High Tg
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current bio-based plastics lack high heat resistance, chemical stability, and optical properties, limiting their application in advanced technologies such as displays and transparent substrates.
Innovation Solution
A polyimide material is developed using a dianhydrohexitol such as isosorbide or isomannide and a tetracarboxylic dianhydride synthesized from trimellitic anhydride with an ester bond, achieving a glass transition temperature of 210°C or higher.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If bio-based plastics are used, then environmental sustainability is improved, but heat resistance and mechanical properties deteriorate
Solution Approach 1:
The patent creates a composite polyimide structure combining bio-derived dianhydrohexitol (isosorbide/isomannide) with tetracarboxylic dianhydride containing ester bonds. This composite molecular structure integrates the sustainability benefits of bio-based materials with the high heat resistance characteristics of polyimide engineering plastics, achieving Tg of 210°C or higher while maintaining bio-based composition.
Solution Approach 2:
The patent modifies the chemical structure parameters by introducing specific ester bond-containing tetracarboxylic dianhydride units into the polyimide backbone. This structural parameter change enables the material to achieve both bio-based sustainability and enhanced thermal stability, with the ester bonds contributing to the overall thermal resistance while maintaining the bio-derived carbon structure.
2Temperature
If petrochemical-derived polyimides are used, then heat resistance and mechanical properties are improved, but environmental sustainability deteriorates
Solution Approach 1:
The patent changes the source parameter of the raw materials from petrochemical to bio-based resources. By using dianhydrohexitol derived from plant starch and tetracarboxylic dianhydride synthesized from trimellitic anhydride, the material maintains the high heat resistance (Tg ≥ 210°C) of traditional polyimides while fundamentally altering the carbon source to renewable biomass, thereby reducing greenhouse gas emissions.
Solution Approach 2:
The patent develops a composite molecular architecture that integrates bio-based dianhydrohexitol units with ester bond-containing tetracarboxylic dianhydride units. This composite structure replicates the performance characteristics of petrochemical polyimides while utilizing renewable carbon sources, effectively substituting fossil-based materials with bio-based alternatives without sacrificing thermal performance.
3Object-generated harmful factors
If most bio-based plastics are used, then environmental sustainability is improved, but optical properties and dielectric properties deteriorate
Solution Approach 1:
The patent optimizes the chemical structure parameters by selecting specific ester bond-containing tetracarboxylic dianhydride units that contribute to excellent optical properties. The resulting polyimide achieves high light transmission and low birefringence, making it suitable for display applications, while simultaneously maintaining bio-based sustainability through the use of dianhydrohexitol from plant resources.
Data Source
AI summary
A polyimide has a repeating unit represented by general formula (1) and having a glass transition temperature (Tg) of 210° C. or higher:wherein A represents a divalent group represented by general formula (5) or a divalent organic group including a cyclic aliphatic group having 4 to 30 carbon atoms:wherein X represents a direct bond, an oxygen atom, a sulfur atom, a sulfonyl group (—SO2—), a carbonyl group (—CO—), an amide group (—NHCO—), an ester group (—OCO—), an alkylidene group having 1 to 15 carbon atoms, a fluorine-containing alkylidene group having 2 to 15 carbon atoms, a cycloalkylidene group having 5 to 15 carbon atoms, a phenylene group, or a fluorenylidene group, and each * represents a bonding position. The polyimide is intended to have high heat resistance, excellent optical properties, and dielectric properties while being made from a bio-derived resource.