Telechelic Macromer UV Solidification via Urethane Linkages
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Solution Overview
Problem
Current materials that change properties in response to UV radiation, such as those used in medical applications, lack versatility and effectiveness in forming solid structures upon exposure to low-intensity UV light, particularly for applications requiring specific physicochemical properties and stability.
Innovation Solution
Development of telechelic macromers with (meth)acrylic end-groups and a core linked by urethane, ester, or anhydride bonds, capable of free radical polymerization, produced through specific chemical reactions in the presence of organic solvents, which can transition from a liquid or waxy state to a solid upon low-intensity UV radiation, incorporating a photoinitiator for cross-linking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional materials are used that change properties in response to UV radiation, then some light-sensitive properties are achieved, but the materials lack versatility and effectiveness in forming solid structures upon exposure to low-intensity UV light
Solution Approach 1:
The patent employs composite materials by combining telechelic macromers with specific functional groups ((meth)acrylic end-groups) and photoinitiators to create a material system that exhibits both light sensitivity and effective solid structure formation. The composite nature allows the material to respond to UV radiation while simultaneously achieving reliable solidification, resolving the contradiction between reliability and versatility.
Solution Approach 2:
The patent utilizes parameter changes by designing macromers that undergo physical state transformation from liquid/waxy to solid upon UV exposure. The iodine value parameter (5-75 range) and molecular structure parameters are specifically controlled to enable this phase transition, allowing the material to change properties in response to UV radiation while forming effective solid structures.
2Stability of the object's composition
If telechelic macromers with specific structures are synthesized through multi-stage chemical reactions, then desired physicochemical properties are achieved, but the manufacturing process becomes complex and time-consuming
Solution Approach 1:
The patent applies segmentation by dividing the synthesis into two distinct stages: first forming the urethane-linked intermediate with the core structure, then adding (meth)acrylic end-groups. This segmented approach allows each stage to be optimized independently, achieving stable physicochemical properties while managing manufacturing complexity through structured process division.
Solution Approach 2:
The patent implements preliminary action by first synthesizing the core telechelic macromer structure with urethane linkages before introducing the polymerizable (meth)acrylic groups. This preliminary formation of the stable core structure ensures physicochemical stability is established early, while subsequent modifications can be performed more efficiently.
3Reliability
If the iodine value of telechelic macromer is controlled within a specific range (5-75), then desired solidification properties upon UV exposure are achieved, but the synthesis conditions become more restrictive
Solution Approach 1:
The patent directly applies parameter changes by controlling the iodine value within the specific range of 5-75 to achieve reliable solidification upon UV exposure. This parameter control is integrated into the synthesis process by selecting appropriate starting materials and reaction conditions, managing the restrictiveness through systematic parameter optimization rather than arbitrary constraints.
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 telechelic macromers exhibit desired properties, enabling them to be easily shaped and solidified upon UV exposure, suitable for applications in medical equipment coatings and other uses, with enhanced stability and functionality.
Implementation Method 1
capable of free radical polymerization, produced through specific chemical reactions in the presence of organic solvents, which can transition from a liquid or waxy state to a solid upon low-intensity UV radiation, incorporating a photoinitiator for cross-linking
Data Source
AI summary
A telechelic macromer is disclosed having (meth)acrylic end-groups and a core. The macromer defined by Formula 1 comprises a core Y (Formulas 2 to 9) that is linked to (meth)acrylic groups by urethane, ester or anhydride bonds and has iodine value ranging from 5 to 75. The method involves a chemical reaction carried out in solvent, ranging 6-24 hours, wherein the precursor of a core (Formulas 2 and 3) reacts in two stages with compounds forming urethane bonds, or wherein the precursor of a core (Formulas 4 to 8) reacts in one stage with compounds forming ester bonds, or wherein the precursor of a core defined by Formula 9 reacts in one stage with compounds forming anhydride bonds. The urethane, ester and anhydride moieties comprise groups capable of free radical polymerization isolating the final product by evaporation. The composition disclosed provides the macromer, a photoinitiator and possibly a reactive diluent.