Amine-Functional Ethylene-Diene Copolymers for Lower Rubber Stiffness
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Solution Overview
Problem
Existing ethylene-1,3-butadiene copolymers used in tire rubber compositions exhibit high stiffness, making them unsuitable for certain applications.
Innovation Solution
Development of a copolymer of ethylene and 1,3-diene with an amine function, synthesized using a specific catalytic system, followed by functionalization to reduce stiffness and improve interaction with reinforcing fillers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ethylene-1,3-diene copolymers are used as impact modifiers in polypropylene, then impact strength is improved, but the polymers tend to aggregate and phase separate during processing and storage
Solution Approach 1:
A compatibilizer is introduced as an intermediary substance between the polypropylene matrix and ethylene-1,3-diene copolymer impact modifiers. The compatibilizer has molecular structures that are compatible with both phases, reducing interfacial tension and preventing aggregation and phase separation of the impact modifiers during processing and storage.
Solution Approach 2:
The invention creates a composite material system consisting of polypropylene, ethylene-1,3-diene copolymer impact modifiers, and compatibilizer. This composite structure allows the impact modifiers to be uniformly distributed and stably integrated into the polypropylene matrix, maintaining compositional stability while improving impact strength.
2Ease of manufacture
If conventional polypropylene is used, then processing is simple, but impact strength and flexibility are insufficient for automotive underbody applications
Solution Approach 1:
The invention develops a composite material by combining polypropylene with ethylene-1,3-diene copolymer impact modifiers and compatibilizer. This composite maintains the processing simplicity of conventional polypropylene while significantly improving impact strength and flexibility through the dispersed rubber particles that absorb impact energy.
Solution Approach 2:
The compatibilizer creates local regions of improved compatibility at the interface between the polypropylene matrix and impact modifier particles. This local modification ensures uniform distribution and stable integration of the impact modifiers, enhancing overall mechanical properties without complicating processing.
3Strength
If polyolefin elastomers are used as impact modifiers, then impact strength is improved, but they aggregate and phase separate during processing and storage
Solution Approach 1:
The compatibilizer serves as an intermediary that is chemically compatible with both the polypropylene matrix and polyolefin elastomer impact modifiers. It reduces interfacial tension and prevents aggregation and phase separation of the elastomer particles during processing and storage, maintaining compositional stability.
Solution Approach 2:
The compatibilizer modifies the interfacial parameters between the polypropylene matrix and polyolefin elastomer particles. By changing the interfacial tension and adhesion properties, the compatibilizer ensures stable dispersion and prevents phase separation of the impact modifiers.
Data Source
AI summary
The invention relates to an ethylene copolymer and a 1,3-diene copolymer of formula CH2=CR-CH=CH2, said copolymer having an amine function, and the symbol R representing a hydrocarbon chain having 3 to 20 carbon atoms. Such a copolymer improves the trade-off between the ethylene content in the polymer, its crystallinity and the stiffness of a rubber composition containing same.