Isoprene Rubber Composition Nanoscale Crosslink Control
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Solution Overview
Problem
Current rubber compositions for tires lack a method to achieve a homogeneously crosslinked structure, which is essential for reducing energy loss and improving fracture energy, making it difficult to simultaneously lower tan δ at 60°C and enhance fracture energy at 25°C.
Innovation Solution
A rubber composition with an isoprene-based rubber and carbon black, where the correlation length Ξb is controlled to 55 nm or less through X-ray or neutron scattering analysis, ensuring a homogeneously crosslinked structure that reduces energy loss and improves fracture properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional crosslinked structures are used in rubber compositions, then the rubber provides basic tire functionality, but energy loss is high and fracture energy is insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the correlation length parameter to 55 nm or less, which fundamentally alters the crosslinked structure's physical properties. This parameter control simultaneously reduces energy loss (tan δ at 60°C) and enhances fracture energy (at 25°C), resolving the contradiction between these two opposing requirements through quantitative structural optimization.
Solution Approach 2:
The patent implements local quality by creating a specific spatial distribution of crosslinked structures with controlled correlation length. The homogeneous crosslinked structure with Ξb ≤ 55 nm provides locally optimized properties that differ from conventional heterogeneous structures, enabling simultaneous improvement of energy dissipation and fracture resistance through localized structural uniformity.
2Reliability
If crosslinked structure is not controlled, then manufacturing is simpler, but tan δ at 60°C is high and fracture energy is low
Solution Approach 1:
The patent replaces conventional mechanical/empirical control methods with advanced analytical techniques (X-ray scattering analysis or neutron scattering analysis) to measure and control the correlation length. This substitution of measurement and control mechanisms enables precise characterization of the crosslinked structure at the nanoscale, achieving reliable tire performance through scientifically grounded structural parameters.
3Loss of energy
If homogeneous crosslinked structure is achieved, then energy loss is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing the target correlation length parameter (55 nm or less) as a design specification before manufacturing. This predetermined structural target guides the vulcanization process and material formulation, enabling homogeneous crosslinked structure formation through planned compositional design rather than complex post-processing or iterative adjustments.
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 rubber composition achieves low tan δ at 60°C and high fracture energy at 25°C by controlling the correlation length, resulting in improved tire performance with reduced energy loss and enhanced abrasion resistance.
Implementation Method 1
a scattering intensity curve I(q) obtained by X-ray scattering analysis or neutron scattering analysis
Implementation Method 2
a scattering intensity curve I(q) obtained by X-ray scattering analysis or neutron scattering analysis
Data Source
Figure 1
AI summary
Provided is a rubber composition for tires having low tan δ at approximately 60°C and excellent fracture energy at approximately 25°C. Included is a rubber composition for tires, containing a rubber component including an isoprene-based rubber, the rubber composition having a correlation length Ξb of 55 nm or less as determined by fitting the following Equations 1 to 6 to a scattering intensity curve I(q) obtained by X-ray scattering analysis or neutron scattering analysis: Iq=A1+q2ξ2+B1+q2Ξb22+C1+q2Ξc22 ξ<Ξb<Ξc A=8πNaσ2ξ3 B=4πNbσ2Ξb2 C=4πNcσ2Ξc2 q=4πsinθ2λ A, B, C, ξ, Ξb, Ξc : fitting parameter q : scattering vector Na : number per unit volume (number/cm3) of scatterers having a correlation length ξ Nb : number per unit volume (number/cm3) of scatterers having a correlation length Ξb Nc : number per unit volume (number/cm3) of scatterers having a correlation length Ξc σ : electron density difference (electron·(cm-3)) between scatterers and the surrounding matrix, or scattering length density difference (cm-2) between scatterers and the surrounding deuterated solvent θ : scattering angle λ : wavelength of X rays or neutrons