Meta-POSS Compound With Si–O–R2–O–Si Linkages for Molding Processability
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Solution Overview
Problem
Conventional polyhedral oligomeric silsesquioxane (POSS) compounds face challenges with low handling and molding processability due to their solid nature, despite possessing excellent weather resistance, heat resistance, physical properties, optical properties, and low dielectric properties.
Innovation Solution
A novel meta-POSS compound with a structural unit of —Si—O—R2-O—Si—, represented by General Formula (1), is synthesized through a reaction of silane and diol in a diluent solvent using a catalyst, followed by purification in vacuum, resulting in an oligomer with improved flexibility and reduced curing shrinkage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional POSS compounds with multifunctional groups are used, then weather resistance, heat resistance, physical properties, optical properties, and chemical stability are improved, but handling and molding processability deteriorate due to their solid nature
Solution Approach 1:
The patent changes the physical state parameter of POSS compounds from solid to liquid by introducing flexible alkyl groups (R2) between silicon atoms. This parameter change maintains the protective shell structure and functional groups (R1) that provide weather and heat resistance, while the liquid state improves handling and molding processability
Solution Approach 2:
The patent creates a composite structure where a rigid inorganic silicon oxide core (providing thermal and mechanical stability) is combined with flexible organic alkyl groups (providing processability) and functional groups (providing specific chemical properties). This composite material approach resolves the contradiction between rigidity for performance and flexibility for processing
2Stability of the object's composition
If conventional POSS compounds are synthesized with multiple functional groups, then chemical stability and physical properties are improved, but the compounds become solid making reaction control difficult
Solution Approach 1:
The patent changes the physical state from solid to liquid by modifying the molecular structure with flexible alkyl chains, which improves reaction control and handling during manufacturing while maintaining chemical stability through the robust silicon oxide core and protective shell structure
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 meta-POSS compound exhibits enhanced handling and molding processability, along with improved weather resistance, heat resistance, physical properties, and low dielectric properties, facilitating its application in various industries.
Implementation Method 1
a step of reacting silane and diol in a diluent solvent using a catalyst
Implementation Method 2
reacting silane and diol... to form meta-POSS oligomer
Implementation Method 3
purifying the reaction mixture in vacuum
Data Source
AI summary
The present invention relates to a novel meta-polyhedral oligomeric silsesquioxane (meta-POSS) compound as a modified polyhedral oligomeric silsesquioxane, which is a polysiloxane-based compound, a preparation method thereof, and a composition containing the meta-POSS compound prepared by the preparation method. The novel meta-POSS compound is characterized by including a structural unit of —Si—O—R2-O—Si—.