Block-Copolymer Rubber Composition for Stiffness With Low Hysteresis
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Solution Overview
Problem
Existing rubber compositions face challenges in achieving high stiffness with limited hysteresis and weight, and the use of ultra-high molecular weight polyethylene (UHMWPE) is limited by its low melting point and poor dispersion in rubber formulations.
Innovation Solution
A rubber composition comprising a block-copolymer with an elastomer block and a poly alkylacrylate thermoplastic block, which enhances reinforcement and reduces phase sizes, improving stiffness and processability while maintaining thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ultra-high molecular weight polyethylene (UHMWPE) is used to improve stiffness, then stiffness is improved, but melting point remains low (135°C) and dispersion is poor
Solution Approach 1:
The patent uses a block copolymer composite consisting of an elastomer block and a thermoplastic block containing polyalkylacrylate with polycyclic substituents. This composite structure combines the flexibility and compatibility of elastomers with the reinforcing properties of thermoplastics, achieving high stiffness while maintaining thermal stability above 135°C, thereby resolving the contradiction between stiffness improvement and thermal reliability.
2Strength
If ultra-high molecular weight polyethylene (UHMWPE) is used to improve stiffness, then stiffness is improved, but dispersion in rubber formulations is poor
Solution Approach 1:
The block copolymer features localized functional blocks: the elastomer block provides compatibility and uniform distribution within the rubber matrix, while the thermoplastic block containing polyalkylacrylate with polycyclic substituents provides reinforcement. This local differentiation of properties enables both excellent dispersion and high stiffness, resolving the contradiction between ease of manufacture and strength.
3Strength
If filler materials are increased to higher levels to improve stiffness, then stiffness is improved, but weight increases and mixing problems occur
Solution Approach 1:
The patent changes the chemical and physical parameters of the reinforcing agent by using a block copolymer with specific molecular architecture and polycyclic substituents. This enables achieving high stiffness at lower concentrations (reduced weight) compared to conventional fillers, while the molecular structure facilitates easier mixing and dispersion, thereby resolving the contradictions between stiffness, weight, and ease of manufacture.
Data Source
Figure 1
AI summary
A rubber composition is disclosed comprising an elastomer, a filler, and a block-copolymer comprising an elastomer block and a thermoplastic block comprising a poly alkylacrylate. The poly alkylacrylate contains a single bonded oxygen atom. The alkylacrylate comprises a polycyclic substituent at its single bonded oxygen atom. The rubber composition may be used in an article of manufacture selected from a tire, a power transmission belt, a hose, a track, an air sleeve, and a conveyor belt. Also, a block-copolymer is disclosed comprising an elastomer block, and a thermoplastic block comprising a poly alkylacrylate. The poly alkylacrylate contains a single bonded oxygen atom. The alkylacrylate comprises a polycyclic substituent at its single bonded oxygen atom. The block-copolymer is a diblock copolymer.