Hydrogenated Cycloolefin Polymer Balancing Formability and Stability
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Solution Overview
Problem
Hydrogenated tetracyclododecene ring-opening polymers exhibit excellent high-temperature dimensional stability but inferior formability, and when modified to improve formability, they often compromise on thermal yellowing resistance or strength.
Innovation Solution
A hydrogenated cycloolefin ring-opening polymer with a repeating unit derived from tetracyclododecene and norbornene-based monomers, having a racemo diad ratio of 65% or more and a weight average molecular weight of 10,000 to 40,000, which balances thermal yellowing resistance, high-temperature dimensional stability, and formability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a hydrogenated tetracyclododecene ring-opening polymer is used, then high-temperature dimensional stability is improved, but formability deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the weight average molecular weight within a specific range (10,000 to 40,000) and the racemo diad ratio at 65% or more. These parameter optimizations enable the polymer to achieve both excellent formability without significant weld lines and high-temperature dimensional stability, resolving the contradiction between ease of manufacture and stability.
2Ease of manufacture
If the polymer is modified to improve formability, then ease of manufacture is improved, but thermal yellowing resistance deteriorates
Solution Approach 1:
The patent resolves this contradiction by optimizing the weight average molecular weight to 10,000 to 40,000 and controlling the racemo diad ratio at 65% or more. These parameter changes enable the polymer to exhibit both excellent formability and superior thermal yellowing resistance, achieving a balance between ease of manufacture and reliability.
3Ease of manufacture
If the polymer is modified to improve formability, then ease of manufacture is improved, but strength deteriorates
Solution Approach 1:
The patent resolves this contradiction by controlling the weight average molecular weight within 10,000 to 40,000 and maintaining a racemo diad ratio of 65% or more. These parameter optimizations enable the polymer to achieve excellent formability while maintaining high strength, with flexural strength of 70 MPa or more and tensile strength of 50 MPa or more.
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 polymer achieves excellent thermal yellowing resistance, high-temperature dimensional stability, and improved formability without significant weld lines, making it suitable for optical members like camera lenses in automobiles.
Implementation Method 1
a hydrogenated cycloolefin ring-opening polymer
Implementation Method 2
hydrogenating 99% or more of main-chain carbon-carbon double bonds
Data Source
Figure 1
AI summary
The present invention is a hydrogenated cycloolefin ring-opening polymer comprisin g a repeating unit derived from tetracyclododecene, and a repeating unit derived fro m an additional norbornene-based monomer, the hydrogenated cycloolefin ring-openi ng polymer having a racemo diad ratio of 65% or more with respect to the repeati ng unit derived from tetracyclododecene, the hydrogenated cycloolefin ring-opening polymer having a weight average molecular weight (Mw) of 10,000 to 40,000.