Functionalized Elastomeric Polymer Compositions for Low Hysteresis
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Solution Overview
Problem
Current rubber vulcanizates face challenges with high hysteresis loss, reduced processability, and compromised abrasion resistance due to linear polymer chains, and existing methods for modifying polymer chain ends are limited in effectively addressing these issues, especially when using silane sulfide omega chain end modifiers which only functionalize one polymer chain end.
Innovation Solution
A polymer composition comprising a combination of single and dual terminally modified conjugated diene polymers, where the polymer chains are modified using specific compounds to reduce free chain ends and enhance interactions with fillers, thereby improving hysteresis loss and abrasion resistance while maintaining good processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If polymer chains are functionalized with polar groups to reduce hysteresis loss, then hysteresis loss is reduced, but workability of the compound is remarkably reduced
Solution Approach 1:
The patent applies local quality by functionalizing only the chain ends of polymer molecules with polar groups, while keeping the bulk of the polymer chain non-polar. This localized modification reduces hysteresis loss through improved filler interaction at chain ends, while maintaining good workability because the majority of the polymer structure remains unchanged and compatible with standard processing oils and additives.
2Loss of energy
If high molecular weight polymer is used to reduce hysteresis loss, then hysteresis loss is reduced, but processability is reduced
Solution Approach 1:
The patent changes the chemical parameter of the polymer chain ends by introducing polar functional groups through reaction with agents like silane sulfides or isocyanates. This chemical modification alters the interaction parameters between polymer chains and fillers, reducing hysteresis loss without requiring changes to molecular weight or bulk polymer structure that would compromise processability.
3Ease of manufacture
If coupling processes are applied to generate branching to improve processability, then processability is improved, but hysteresis loss increases and abrasion resistance decreases
Solution Approach 1:
The patent segments the polymer structure into distinct functional regions: non-polar bulk chains that provide mechanical strength and processability, and polar chain end groups that control hysteresis and filler interaction. This segmentation allows independent optimization of each region's properties without the compromise inherent in bulk structural modifications like branching.
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 proposed solution results in a vulcanized elastomeric composition with reduced hysteresis loss, improved wet grip, and enhanced abrasion resistance, maintaining acceptable processability and rolling resistance, thus addressing the limitations of existing technologies.
Implementation Method 1
The functionalization of chain ends with polar groups suitable to interact with filler leads to a reduced amount of free chain ends and usually reduces hysteresis
Implementation Method 2
The polymer composition is useful in the preparation of a vulcanized and, thus, crosslinked elastomeric composition
Data Source
AI summary
The invention relates to an elastomeric polymer composition and its preparation. The polymer composition includes, in combination, a single terminally modified conjugated diene (co)polymer and a dual terminally modified conjugated diene (co)polymer. The polymer composition is useful in the preparation of a vulcanized and, thus, crosslinked elastomeric composition having relatively low hysteresis loss, good grip and low heat build-up properties.