Polymerizable Monomer Low Viscidity High Strength
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Solution Overview
Problem
Current polymerizable monomers, such as Bis-GMA and those with a biphenyl skeleton, face challenges with high viscosity at room temperature and poor mechanical strength, making them difficult to handle and use effectively in applications requiring ease of blending and strong mechanical properties.
Innovation Solution
A polymerizable monomer with a specific structure represented by general formulas (1) and (3), featuring aromatic groups connected through a divalent group X, which reduces crystallinity and increases flexibility, resulting in low viscosity and enhanced mechanical strength, is developed. This structure includes ester bonds and hydroxy groups strategically placed to improve compatibility and storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional polymerizable monomers like Bis-GMA or biphenyl-based monomers are used to achieve high mechanical strength in cured products, then the mechanical strength is improved, but the viscosity becomes extremely high and handling becomes difficult
Solution Approach 1:
The patent changes the chemical structure parameters of the polymerizable monomer by introducing specific aromatic groups (Ar1 and Ar2) with controlled substituent positions and types. This structural parameter change achieves a balance where the cured product maintains high mechanical strength while the monomer itself has reduced viscosity and improved handling properties compared to conventional Bis-GMA or biphenyl-based monomers
Solution Approach 2:
The patent creates a composite molecular structure combining aromatic groups (Ar1 and Ar2) connected through a divalent group (X), with specific ester bonds and hydroxy groups strategically placed. This composite structural design allows the monomer to achieve both low viscosity for easy handling and high mechanical strength in the cured product, resolving the contradiction between these two properties
2Strength
If polymerizable monomers with high mechanical strength are used, then the strength of the cured product is improved, but the viscosity remains high making blending with other components difficult
Solution Approach 1:
The patent modifies the molecular structure parameters by selecting specific aromatic groups and their substitution patterns, which reduces the viscosity of the monomer while maintaining the capability to form strong cured products. This parameter optimization enables easy blending with other components during manufacturing
Solution Approach 2:
The patent introduces specific functional groups (ester bonds and hydroxy groups) at strategic positions within the molecular structure. These local structural features enhance compatibility with other components and reduce viscosity, while the overall aromatic core structure maintains mechanical strength, thus resolving the contradiction between strength and blending ease
Data Source
AI summary
Provided are: a polymerizable monomer excellent in mechanical strength of its cured product and excellent also in handling property with low viscosity even under a room temperature environment, specifically, a polymerizable monomer, which is represented by the following general formula (1): in the general formula (1), X represents a divalent group, Ar1 and Ar2 each represent an aromatic group having a valence selected from divalence to tetravalence, and may be identical to or different from each other, L1 and L2 each represent a hydrocarbon group having a main chain with a number of atoms within a range of from 2 to 60 and having a valence selected from divalence to tetravalence, and may be identical to or different from each other, R1 and R2 each represent a hydrogen atom or a methyl group, and m1, m2, n1, and n2 each represent an integer selected from a range of from 1 to 3; and a curable composition and a resin member each using the polymerizable monomer.