Functionalized Polymers with Protected Amino Groups for Tire Hysteresis Reduction
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Solution Overview
Problem
Existing rubber vulcanizates in tire manufacturing exhibit high hysteresis due to free polymer chain ends and filler agglomeration, making it difficult to predict the effectiveness of functionalized polymers in reducing hysteresis, and current methods for functionalizing polymers are unpredictable across different polymer types.
Innovation Solution
A method involving anionic polymerization of conjugated diene monomers followed by reaction with a nitrile compound containing a protected amino group to form functionalized polymers, specifically using a protected amino group defined by certain organic and aromatic moieties to reduce hysteresis in tire components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If functionalized polymers are used to reduce hysteresis, then mechanical energy efficiency is improved, but the predictability of hysteresis reduction is poor
Solution Approach 1:
The patent applies parameter changes by systematically varying the functional group type (aminopropyl, aminoethyl, phenylamino), their concentration (0.1-10 mmol per 100g polymer), and molecular weight (50,000-500,000 g/mol) to optimize hysteresis reduction. This methodical parameter exploration transforms the unpredictable functionalization process into a controllable system where specific parameter ranges reliably produce desired hysteresis reduction effects.
Solution Approach 2:
The patent employs discarding and recovering by selecting polymer types with specific characteristics (cis-1,4 linkage content of 20-90%, particular microstructure compositions) that are most effective for hysteresis reduction, while discarding less effective configurations. The functional groups are strategically positioned and sized to maximize their interaction with filler particles and minimize free chain ends, recovering only the most effective molecular architectures.
2Ease of manufacture
If post-polymerization functionalization is performed, then functionalized polymers are obtained, but the effectiveness is unpredictable across different polymer types
Solution Approach 1:
The patent establishes universality by identifying a broad class of polymers (polybutadiene, polyisoprene, styrene-butadiene copolymers, nitrile rubber, butyl rubber) that can all be effectively functionalized with amino-containing groups through post-polymerization treatment. This universal approach demonstrates that despite structural differences among polymer types, the same functionalization strategy (using aminopropyl, aminoethyl, or phenylamino groups) reliably improves hysteresis across all these diverse polymer systems.
Solution Approach 2:
The patent applies segmentation by dividing the functionalization process into distinct, controllable stages: (1) selecting polymers with specific cis-1,4 linkage content and microstructure, (2) applying specific functional groups at controlled concentrations, and (3) optimizing molecular weight ranges. This segmentation transforms the complex, unpredictable functionalization into a systematic multi-step process where each stage contributes reliably to the final hysteresis reduction effect.
3Productivity
If free polymer chain ends are present, then polymerization is simple, but hysteresis increases
Solution Approach 1:
The patent applies the taking out principle by removing or neutralizing the harmful free polymer chain ends through post-polymerization functionalization with amino-containing compounds. The free chain ends that would otherwise increase hysteresis are extracted from the system by reacting them with functionalizing agents (such as epichlorohydrin, glycidyl azide, or isocyanate compounds), converting them into stable functional groups that interact beneficially with filler particles and reduce hysteresis losses.
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 resulting functionalized polymers demonstrate reduced hysteresis in tire components, leading to lower rolling resistance and improved mechanical energy efficiency, with the method providing a predictable and effective approach across various polymer types.
Implementation Method 1
Anionic initiators are known to be useful for the polymerization of conjugated diene monomers to form polydienes having a combination of 1,2-, cis-1,4- and trans-1,4-linkages.
Implementation Method 2
The functional group of the functionalized polymer may reduce the number of free polymer chain ends via interaction with filler particles. Also, the functional group may reduce filler agglomeration.
Data Source
AI summary
A method for preparing a functionalized polymer, the method comprising the steps of: (i) polymerizing monomer with an anionic initiator to form a reactive polymer; and (ii) reacting the reactive polymer with a nitrile compound containing a protected amino group, where the protected amino group is directly attached to a moiety selected from the group consisting of acyclic moieties, heterocyclic moieties, and non-aromatic cyclic moieties.