Silane-Functionalized Polymer Initiators for Tire Tread Hysteresis
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Solution Overview
Problem
Current tire formulations face challenges in achieving low hysteresis loss, high abrasion resistance, and good wet grip properties simultaneously, as existing methods often compromise on either rolling resistance or wet grip when optimizing for one property.
Innovation Solution
A polymerization initiator compound, represented by Formula 1, is used to create modified polymers by reacting with polymerizable monomers, which are then blended with fillers and vulcanizing agents to form vulcanized elastomeric compositions with improved dynamic properties, including low hysteresis loss and high abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the polystyrene unit concentration is reduced to lower glass transition temperature, then rolling resistance is improved, but wet grip performance deteriorates
Solution Approach 1:
The patent applies local quality by functionalizing only the chain ends of polymer molecules with silane groups, rather than modifying the entire polymer structure. This localized modification at chain ends allows reduction of hysteresis loss without significantly altering the bulk polymer properties that determine wet grip, thus resolving the contradiction between rolling resistance and wet grip performance
Solution Approach 2:
The patent changes the chemical parameter of chain end groups by introducing silane functionality through reaction with compounds like (CH3O)3SiR3. This parameter change reduces hysteresis loss and improves rolling resistance while maintaining the glass transition temperature and wet grip properties through controlled functionalization degree
2Loss of energy
If the 1,2-polybutadiene unit concentration is reduced to lower glass transition temperature, then rolling resistance is improved, but wet grip performance deteriorates
Solution Approach 1:
The patent applies local quality by targeting chain end functionalization rather than bulk polymer modification. This localized approach reduces hysteresis loss without significantly changing the 1,2-polybutadiene unit concentration or glass transition temperature, thereby improving rolling resistance while preserving wet grip performance
Solution Approach 2:
The patent creates a composite structure at the molecular level by combining the original polymer chain with silane functional groups at chain ends. This composite approach introduces new properties (reduced hysteresis) without fundamentally altering the base polymer composition that determines wet grip characteristics
3Loss of energy
If coupling agents are used to functionalize polymer chain ends, then hysteresis loss is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent extracts the functionalization step from complex multi-component coupling systems and simplifies it to a direct reaction between living anionic polymer chains and silane compounds. This eliminates the need for separate coupling agents and reduces manufacturing complexity while achieving the same hysteresis reduction effect
Solution Approach 2:
The patent uses the living anionic chain end itself as an intermediary that directly reacts with silane compounds, eliminating the need for separate coupling agent mediators. This direct reaction pathway simplifies the manufacturing process while effectively functionalizing chain ends to reduce hysteresis loss
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 solution effectively reduces hysteresis loss and heat build-up while maintaining good wet grip and abrasion resistance, enhancing the performance of tire treads by optimizing the dynamic properties of vulcanized elastomeric compositions.
Implementation Method 1
The invention provides a polymerization initiator which is a compound having at least two carbanions which are each linked to a metal atom M1
Implementation Method 2
a polymerization initiator which is a compound having at least two carbanions which are each linked to a metal atom M1
Implementation Method 3
The invention also relates to polymers, including modified (i.e. chain-end modified) polymers, prepared with the initiators of the invention and to polymer compositions made therefrom
Implementation Method 4
The polymer compositions are useful in the preparation of vulcanized and, thus, cross-linked elastomeric compositions
Data Source
AI summary
The invention relates to polymers obtainable by using novel polymerization initiator compounds and optionally chain end modifying agents. The invention further relates to a method of making the initiator compounds and the corresponding polymers, including chain end-modified polymers. The invention, also relates to polymer compositions comprising the polymer of the invention, and further components such, as extender oils, fillers, etc., and to corresponding vulcanized polymer compositions and articles comprising vulcanized parts made from, the vulcanized polymer composition.