Block Copolymer Hydrogenate Vibration Damping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing block copolymers require individual planning based on temperature environments for optimal vibration damping performance, making it difficult to maintain performance across varying temperature conditions and multiple applications.
Innovation Solution
A block copolymer hydrogenate with a polymer block A containing over 70 mol% aromatic vinyl units and a polymer block B with 30 mol% or more conjugated diene units, specifically isoprene, and a total vinyl bond content of 60 mol% or more, achieving high vibration damping performance across a broad temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the vinyl bond amount of isoprene units is controlled to fall within 30% to 60% to improve vibration damping performance at high temperatures, then the main dispersion peak of tanδ shifts to 30°C or higher, but the vibration damping performance in ordinary service temperature range deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the vinyl bond amount (3,4-bond unit and 1,2-bond unit) of isoprene units to fall within 30% to 60%, which shifts the main dispersion peak of tanδ to 30°C or higher while maintaining adequate vibration damping performance across both ordinary and high temperature ranges through optimized compositional parameters
2Reliability
If the vinyl bond amount of isoprene units is increased to 60 mol% or more to improve high temperature vibration damping performance, then the broad temperature range vibration damping is improved, but the mechanical strength and heat resistance deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the vinyl bond amount to fall within the optimized range of 30% to 60%, avoiding excessive vinyl bond content that would compromise mechanical strength and heat resistance while still achieving improved vibration damping performance across broad temperature ranges
Solution Approach 2:
The patent uses a composite block copolymer structure combining aromatic vinyl compound blocks (for mechanical strength and heat resistance) with isoprene units containing controlled vinyl bond amounts (for vibration damping performance), creating a material that balances both requirements
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 block copolymer hydrogenate exhibits excellent vibration damping performance from -70°C to 100°C with a tanδ value of 1.0 or more, ensuring consistent performance across a wide temperature range and multiple applications.
Implementation Method 1
80 mol% or more of the carbon-carbon double bond that the polymer block (B) has is hydrogenated
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
A block copolymer hydrogenate, which is a hydrogenate of a block copolymer having a polymer block (A) containing a structural unit derived from an aromatic vinyl compound in an amount of more than 70 mol%, and a polymer block (B) containing a structural unit derived from a conjugated diene compound in an amount of 30 mol% or more, and further satisfies the following requirements: Requirement (1): The content of the polymer block (A) in the block copolymer hydrogenate is 1 to 30% by mass. Requirement (2): The conjugated diene compound contains isoprene. Requirement (3): A total content of the 1,2-bond unit and the 3,4-bond unit in the structural units derived from the conjugated diene compound is 60 mol% or more. Requirement (4): The hydrogenation rate of the polymer block (B) is 60 mol% or more. Requirement (5): The block copolymer hydrogenate has a serial temperature range where tanδ, as measured according to JIS K7244-10(2005) and under the conditions of a strain of 0.1%, a frequency of 1 Hz, a measurement temperature of -70 to 100°C and a rate of temperature increase of 3°C/min, is 1.0 or more, and the maximum width of the temperature range is 16°C or more.