Fibrous Pulp Elastomer Composite Yield Strain
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Solution Overview
Problem
Existing rubber-fibrous pulp composites fail to achieve a yield strain of at least 70%, yield stress of at least 4 MPa, and elongation at break of at least 200% when used in high strain applications, such as tires, due to decreased performance with higher aramid pulp concentrations, fiber dispersing agents, and interface modifiers.
Innovation Solution
A composition comprising an elastomer, 1 to 5 volume % of fibrous pulp with specific surface area and fiber characteristics, and 5 to 14 volume % of yield-strain promoters like fibers, needles, or platelets, which together achieve a yield strain of at least 70%, elongation at break of at least 200%, and yield stress of at least 4 MPa.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If higher aramid pulp concentrations are used to improve strength, then yield stress increases, but yield strain decreases
Solution Approach 1:
The patent changes the physical and chemical parameters of the system by introducing yield-strain promoters with specific properties (fiber length 0.5-1.1mm, tensile modulus 6-130 GPa, tensile strength 1-3 GPa) and controlling pulp concentration at 1-5 volume%, thereby achieving both high yield stress (≥4 MPa) and high yield strain (≥70%) simultaneously
Solution Approach 2:
The patent creates a composite material system combining elastomer matrix with fibrous pulp reinforcement and yield-strain promoters, where the synergistic interaction between different components enables both high strength and high elongation properties that cannot be achieved with single materials
2Ease of manufacture
If fiber dispersing agents and interface modifiers are used to improve dispersion, then processing ease improves, but yield strain decreases
Solution Approach 1:
The patent eliminates or minimizes the use of fiber dispersing agents and interface modifiers by optimizing the pulp characteristics themselves (specific surface area 7-11 sq.m./g, fiber length 0.5-1.1 mm), thereby avoiding the negative side effects these additives have on yield strain while maintaining good processing ease
3Strength
If elastomeric composition is designed for high strength, then yield stress increases, but elongation at break decreases
Solution Approach 1:
The patent achieves the breakthrough of simultaneously high yield stress (≥4 MPa) and high elongation at break (≥200%) by changing key parameters: controlling pulp concentration at 1-5 volume%, selecting specific pulp properties (specific surface area 7-11 sq.m./g, fiber length 0.5-1.1 mm), and incorporating 5-14 volume% yield-strain promoters with optimized characteristics
Solution Approach 2:
The patent develops a multi-component composite elastomeric composition where the interaction between elastomer matrix, fibrous pulp (1-5 volume%), and yield-strain promoters (5-14 volume%) creates synergistic effects that enable both high strength and high extensibility, achieving yield strain ≥70% and elongation at break ≥200%
Data Source
AI summary
A composition comprises (i) an elastomer, (ii) from 1 to 5 volume % of fibrous pulp, the pulp having a specific surface area of from 7 to 11 sq.m./g and the fiber having a fiber length of from 0.5 to 1.1 mm, a tensile modulus of from 2.5 to 130 GPa, and a tensile strength of from 1 to 3 GPa, and (iii) from 5 to 14 volume % of yield-strain promoter in the form of fibers, needles, powder or platelets, wherein the composition has a yield strain of at least 70%, an elongation at break of at least 200%, and a yield stress of at least 4 MPa.