Azeotropic Photo-Copolymerization of Styrene and Methacrylate Derivatives
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Solution Overview
Problem
Current dental restorative compositions based on styrene and methacrylate derivatives suffer from slow polymerization, durability issues, and susceptibility to hydrolysis and enzymatic degradation, making them unsuitable for rapid and long-lasting applications.
Innovation Solution
The development of novel compositions combining styrene derivatives with acrylate derivatives and photo-initiators, including carbamate functional groups, to achieve rapid and controlled azeotropic photo-copolymerization, resulting in stable, durable, and biocompatible polymers that maintain monomer ratios throughout the polymerization process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If styrene derivatives are used for dental restorative compositions, then satisfactory performance in oral environment is achieved, but polymerization time becomes excessively long (tens of minutes to hours)
Solution Approach 1:
The patent changes the chemical parameters by introducing acrylate derivatives with specific functional groups (carbamate, urethane, amine) that alter the polymerization kinetics. These parameter changes enable the system to achieve both rapid polymerization and oral environment stability by modifying the monomer reactivity and crosslinking behavior.
Solution Approach 2:
The invention creates a composite monomer system combining styrene derivatives with acrylate derivatives containing carbamate functional groups. This composite approach allows the system to leverage the oral environment stability of styrene while incorporating the rapid polymerization characteristics of acrylates, resolving the time-performance contradiction.
2Loss of time
If methacrylate derivative-based compositions are used, then polymerization can occur in short time frame, but durability and esthetics deteriorate over time with leaching and hydrolysis
Solution Approach 1:
The carbamate functional groups act as intermediary structures that bridge the rapid polymerization capability of methacrylates with the durability of styrene systems. These functional groups provide hydrolytic stability while maintaining fast curing characteristics, serving as a mediator between the two opposing requirements.
Solution Approach 2:
The patent modifies the chemical composition parameters by incorporating acrylate derivatives with carbamate groups, which change the hydrolytic stability parameter and resistance to enzymatic degradation, thereby improving long-term durability while preserving rapid polymerization.
3Productivity
If copolymerization of styrene and dimethacrylate monomers is performed, then polymerization rate improves, but composition shift occurs at high conversion due to diffusion limitations
Solution Approach 1:
The invention changes the molecular parameters of the monomers by using acrylate derivatives with carbamate functional groups, which have different viscosity and diffusivity characteristics compared to traditional dimethacrylates. This parameter change reduces diffusion limitations and maintains more uniform composition throughout polymerization.
Solution Approach 2:
The patent applies local quality by using monomers with specific functional groups (carbamate, urethane, amine) that create localized chemical environments favoring uniform copolymerization. These functional groups modify the local reactivity and diffusion behavior, preventing composition drift in the polymerizing system.
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
These compositions enable rapid polymerization within minutes, enhance mechanical properties, and resist environmental challenges such as hydrolysis and enzymatic degradation, making them suitable for dental applications and other uses like 3D printing and medical devices.
Implementation Method 1
Photo-polymerization is a process in which a monomer is converted to a polymer; the process is initiated by the absorption of visible or ultraviolet light. The light may be absorbed either directly by the reactant monomer (direct photo-polymerization) or by a photosensitizer that absorbs the light and then transfers energy to the monomer.
Implementation Method 2
the dimethacrylate monomers are more viscous than styrene, and thus diffuse more slowly than styrene to reach radicals as the polymerization progresses
Data Source
AI summary
A composition of matter includes a mixture of styrene derivative monomers and methacrylate and/or acrylate derivative monomers, which have one or more urethane, carbamate, amide, and/or amine functional groups, and initiators, and the compositions are used to achieve composition control of the forming polymer, with the mole fraction of acrylate/methacrylate and styrene moieties in the forming polymer determined by the chemistry and composition of the feeding monomers.