Functionalized Siloxane Polymers with Crystalline Arylene Ether Segments
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Solution Overview
Problem
Conventional silicone polymers, such as PDMS, exhibit limited mechanical properties and low thermal conductivity due to their amorphous nature, which restricts their application in high-thermal-transition and high-impact applications, and existing methods to enhance these properties face challenges like storage stability and phase separation issues.
Innovation Solution
Functionalized siloxane polymers with grafted arylene ether groups are developed, which introduce crystalline segments into the polymer matrix, enabling improved thermal conductivity and reversible thermoplastic elastomeric properties over a wide temperature range, and can be tailored by controlling molecular weight and siloxane unit ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If PDMS polymers are used for their viscoelastic behavior, then ease of operation is improved, but mechanical properties and thermal conductivity deteriorate
Solution Approach 1:
The patent creates a composite material system by blending PDMS polymer with thermoplastic polymer components. This composite approach combines the viscoelastic properties of PDMS with the mechanical strength and thermal stability of thermoplastic polymers, resolving the contradiction between ease of operation and mechanical properties
Solution Approach 2:
The patent modifies the chemical composition parameters of the silicone polymer by incorporating specific ratios of thermoplastic polymer components. This parameter change transforms the material from pure PDMS with limited mechanical properties to a modified polymer system with enhanced strength while retaining viscoelastic behavior
2Ease of operation
If PDMS polymers are used, then ease of operation is improved, but thermal conductivity deteriorates
Solution Approach 1:
The patent creates a composite material system by blending PDMS polymer with thermoplastic polymer components. This composite approach combines the viscoelastic properties of PDMS with the mechanical strength and thermal stability of thermoplastic polymers, resolving the contradiction between ease of operation and mechanical properties
Solution Approach 2:
The patent modifies the chemical composition parameters of the silicone polymer by incorporating specific ratios of thermoplastic polymer components. This parameter change transforms the material from pure PDMS with limited mechanical properties to a modified polymer system with enhanced strength while retaining viscoelastic behavior
3Strength
If siloxane polymer is blended with thermoplastic polymer, then mechanical properties are improved, but storage stability deteriorates
Solution Approach 1:
The patent optimizes the compositional parameters by specifying precise ranges for thermoplastic polymer content (5-50 wt%) and molecular weight parameters. This controlled parameter adjustment achieves enhanced mechanical properties while maintaining storage stability within acceptable ranges
Solution Approach 2:
The patent introduces functional groups at specific locations in the polymer chain (terminal and pendant groups) to create localized interaction zones. This local quality modification enables controlled intermolecular interactions that improve mechanical properties without causing bulk phase separation that would compromise storage stability
4Strength
If siloxane polymer is cross-linked, then mechanical properties are improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent utilizes the thermoplastic nature of the modified silicone polymer, which allows processing above the melting point without requiring cross-linking chemistry. This parameter-based approach (controlling molecular weight and composition) achieves enhanced mechanical properties while maintaining ease of manufacture through conventional thermoplastic processing methods
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 functionalized siloxane polymers demonstrate enhanced thermal conductivity and phase change characteristics, offering improved mechanical properties and thermal stability, making them suitable for various applications including personal care, automotive, and electronic products.
Implementation Method 1
functionalized siloxane polymers include grafting of arylene ethers in silicone polymers or resin to impart crystalline segments in the polymer matrix
Implementation Method 2
the functionalized siloxane polymers have phase change characteristics and exhibit reversible thermoplastic elastomeric properties over a wide range of temperatures
Data Source
AI summary
Provided is a silicone polymer of the Formula (I):M1aM2bM3cD1dD2eD3fT1gT2hT3iQj.wherein:M1=R1R2R3SiO1/2 M2=R4R5R6SiO1/2 M3=R7R8R9SiO1/2 D1=R10R11SiO2/2 D2=R12R13SiO2/2 D3=R14R15SiO2/2 T1=R16SiO3/2 T2=R17SiO3/2 T3=R18SiO3/2 Q=SiO4/2 where R1, R2, R3, R5, R6, R8, R9, R10, R11, R13, R15, R16 are independently chosen from a hydrogen, a C1-C60 aliphatic or aromatic group or C1-C60 alkoxy group;R4, R12, R17 are independently chosen from a C1-C60 alkyl, a C1-C60 alkoxy, or R19-A-R20— where A is chosen from a group comprising an unsaturated cyclic moiety chosen from an aromatic group, a fused aromatic group, an unsaturated alicyclic group, an unsaturated heterocyclic group, or a combination of two or more thereof; R19 is chosen from a —H, a C1-C60 alkyl, allyl, vinyl, alkoxy, allyloxy, vinyloxy, acrylate, or methacrylate; and R20 is chosen from a divalent organic group;R7, R14, R18 are independently selected from hydrogen or OR22 or unsaturated monovalent radicals or radicals containing heteroatom such as oxygen, nitrogen, sulfur or radicals containing organosilane groups; andthe subscripts a, b, c, d, e, f, g, h, i, j are zero or positive subject to the following limitations: 2≤a+b+c+d+e+f+g+h+i+j≤1000, b+e+h>0 and c+f+i≥0.