Crosslinkable Composition for High Strength Elastomers
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Solution Overview
Problem
Existing crosslinked products derived from liquid diene elastomers have insufficient mechanical strength, heat resistance, and ozone resistance, limiting their applications.
Innovation Solution
A crosslinkable composition comprising a liquid monocyclic olefin ring-opened polymer with a reactive group at the polymer chain end and a crosslinkable compound having multiple functional groups reactive with the polymer chain end, which reacts to form a crosslinked product with enhanced tensile strength, heat resistance, and ozone resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a liquid diene elastomer is crosslinked to increase mechanical strength, then the mechanical strength is improved, but the heat resistance and ozone resistance deteriorate
Solution Approach 1:
The invention changes the chemical structure parameter of the polymer backbone from a diene structure (liquid polybutadiene or liquid polyisoprene) to a cyclic olefin ring-opened polymer structure. This parameter change in the polymer backbone fundamentally improves heat resistance and ozone resistance while maintaining the ability to crosslink for mechanical strength enhancement.
Solution Approach 2:
The invention creates a composite crosslinked structure by combining the cyclic olefin ring-opened polymer backbone with crosslinkable functional groups (such as vinyl groups, epoxy groups, or isocyanate groups) at the polymer chain ends. This composite approach allows the polymer to benefit from both the inherent stability of the cyclic olefin structure and the mechanical strength provided by crosslinking.
2Stability of the object's composition
If a cyclic olefin ring-opened polymer is hydrogenated to improve stability, then the stability is improved, but the polymer becomes resinous and loses liquid properties
Solution Approach 1:
Instead of hydrogenating the entire polymer chain, the invention introduces crosslinkable functional groups only at the local positions of the polymer chain ends. This localized modification maintains the liquid properties of the bulk polymer while providing the necessary reactivity for crosslinking and improved stability.
Solution Approach 2:
The invention applies partial hydrogenation or functionalization only to the end groups of the polymer chain rather than the entire chain. This partial action is sufficient to provide crosslinking capability and improved stability without affecting the liquid properties of the main polymer body.
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 crosslinked product exhibits high tensile strength and excellent heat and ozone resistance, making it suitable for various applications requiring mechanical strength and durability.
Implementation Method 1
a crosslinkable composition containing a liquid monocyclic olefin ring-opened polymer and a crosslinkable compound... the crosslinked product exhibits high tensile strength and excellent heat resistance and ozone resistance
Data Source
AI summary
A crosslinkable composition containing: a liquid monocyclic olefin ring-opened polymer (A) having a reactive group at a polymer chain end thereof and a weight-average molecular weight (Mw) of 1,000 to 50,000; and a crosslinkable compound (B) having, in the molecule, two or more functional groups reactive with the reactive group at the polymer chain end of the monocyclic olefin ring-opened polymer (A).