Branched Cyclopentene Copolymer for Hot Flow and Low Heat Buildup
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Solution Overview
Problem
Conventional cyclopentene ring-opening copolymers improve hot flowability but compromise low heat buildup as crosslinked rubbers, necessitating a solution that enhances hot flowability without sacrificing low heat buildup.
Innovation Solution
A cyclopentene ring-opening copolymer with a branch structure, where at least four cyclopentene ring-opening polymer chains are linked via a branch-structural unit derived from a polycyclic olefin compound, and at least part of the polymer chains are terminally modified with modifying groups like oxysilyl groups, maintaining low heat buildup while improving hot flowability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cyclopentene ring-opening copolymer is created by copolymerizing cyclopentene and a compound having a vinyl group to improve hot flowability, then hot flowability is improved, but low heat buildup as a crosslinked rubber is not obtained sufficiently
Solution Approach 1:
The patent applies local quality by creating a multi-branch structure where at least four polymer chains are linked via a single branch-structural unit derived from polycyclic olefin compound. This localized branching architecture provides sufficient hot flowability through the branch points while maintaining linear main chains that enable effective crosslinking for low heat buildup performance.
Solution Approach 2:
The patent creates a composite molecular structure combining linear cyclopentene ring-opening polymer chains with polycyclic olefin-derived branch units. This composite architecture integrates the flow-improving effect of branching with the crosslinking capability of terminal modification, achieving both hot flowability and low heat buildup properties simultaneously.
2Loss of energy
If a cyclopentene ring-opening polymer is used as a straight-chain rubber polymer with no branch in the main chain, then low heat buildup is maintained, but hot flowability is inferior
Solution Approach 1:
The patent segments the polymer structure into distinct functional regions: linear main chains that maintain low heat buildup through effective crosslinking, and localized branch structures derived from polycyclic olefin compounds that improve hot flowability. The branching ratio is controlled at 0.01 to 4.0 mol% to balance these opposing requirements.
Solution Approach 2:
The patent applies partial branching rather than full branching, using a controlled amount of polycyclic olefin compound (0.01 to 4.0 mol%) to introduce sufficient branch points for hot flowability improvement while preserving the majority of the linear chain structure needed for low heat buildup performance.
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 approach results in a cyclopentene ring-opening copolymer that excels in hot flowability while maintaining the low heat buildup of crosslinked rubbers, enhancing their mechanical properties and processability.
Implementation Method 1
A cyclopentene ring-opening polymer is obtained by applying ring-opening metathesis polymerization to cyclopentene
Data Source
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AI summary
A cyclopentene ring-opening copolymer having a branch structure contains a structure in which at least four cyclopentene ring-opening polymer chains are linked via a branch-structural unit. At least part of the cyclopentene ring-opening polymer chains is terminally modified.