Organic/Inorganic Hybrid Material for High Tg and Low Moisture
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for enhancing the glass transition temperature (Tg) and reducing moisture absorption of polymethyl methacrylate (PMMA) in organic/inorganic hybrid materials are limited by the high cost and high additive dosage requirements of monomers with hard and steric hindered side chains, and the inefficiencies of the sol-gel process in achieving high refractive index and light transmission ratios.
Innovation Solution
A method involving the use of a metal alkoxide oligomer as a precursor in a sol-gel reaction with a copolymer of methyl methacrylate, methyl acrylamide, and styrene to form an organic/inorganic hybrid material with a reticular structure, which reduces reaction time, improves dispersion, and enhances refractive index, light transmission, and thermal stability, while maintaining low moisture absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If monomers with hard and steric hindered side chain are introduced to enhance Tg of PMMA copolymer, then glass transition temperature is improved, but additive dosage requirement increases and manufacturing cost increases
Solution Approach 1:
The patent changes the chemical parameters of the copolymer by introducing specific monomers (methacrylonitrile, acrylic nitrile, or methacrylic acid) with functional groups that can form strong intermolecular interactions. This allows achieving high Tg (above 120°C) with lower additive dosage (5-50 mol%) compared to conventional hindered side chain monomers, as the functional groups provide enhanced molecular interactions that stabilize the polymer chain at lower concentrations.
2Temperature
If monomers with hard and steric hindered side chain are introduced to enhance Tg of PMMA copolymer, then glass transition temperature is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs inexpensive monomers (methacrylonitrile, acrylic nitrile, or methacrylic acid) that are readily available and cost-effective, replacing expensive monomers with hard and steric hindered side chains. These affordable monomers achieve the same Tg enhancement effect through functional group interactions, significantly reducing material costs while maintaining the required thermal performance.
3Illumination intensity
If metal oxide is introduced into polymer matrix by physical blending to improve refractive index, then refractive index is improved, but content ratio of inorganic powder is limited and transparency deteriorates
Solution Approach 1:
The patent creates an organic/inorganic hybrid material where metal oxide nanoparticles are uniformly dispersed within the PMMA copolymer matrix. The functional groups in the copolymer (from introduced monomers) form strong interactions with metal oxide surfaces, enabling high inorganic content (20-80 wt%) while maintaining uniform dispersion and transparency. This composite structure achieves refractive index above 1.5 without the aggregation problems of physical blending.
4Illumination intensity
If sol-gel process is used to dissolve organic polymer and inorganic salt to form hybrid material, then refractive index is improved, but reaction time increases and manufacturing complexity increases
Solution Approach 1:
The patent performs preliminary copolymerization to create PMMA with built-in functional groups (nitrile or carboxyl) before combining with metal oxide. This pre-functionalization eliminates the need for lengthy in-situ sol-gel reactions, as the metal oxide can be directly incorporated through simpler mixing and curing processes. The preliminary preparation of functional copolymer reduces total manufacturing time while achieving the same refractive index enhancement.
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 approach results in an organic/inorganic hybrid material with a high Tg, high refractive index, and low moisture absorption, suitable for applications in LED sealing materials, lenses, and solar cell mirrors, with improved reproducibility and scalability.
Implementation Method 1
A method involving the use of a metal alkoxide oligomer as a precursor in a sol-gel reaction with a copolymer of methyl methacrylate, methyl acrylamide, and styrene to form an organic/inorganic hybrid material with a reticular structure
Implementation Method 2
the copolymer is co-polymerized by methyl methacrylate, methyl acrylamide, and styrene
Data Source
AI summary
The invention provides an organic/inorganic hybrid material and the method for manufacturing the same. A variety of functional monomers are co-polymerized to form a copolymer. The copolymer is subjected to sol-gel reactions with metal alkoxide oligomers to form an organic/inorganic hybrid material. The hybrid material has a high refractive index, a low moisture absorption, a high light transmission ratio, and a high glass transition point, such that the material can be applied in high light extraction efficient LED sealing materials, thin and light myopia/hypropia lens, portable projector lens, high brightness LCD prism films, solar cell refractive photoelectric conversion mirrors, and camera phone/digital camera lens.