Vinylidene Fluoride Resin Transparency via Crystal Refinement
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Solution Overview
Problem
Vinylidene fluoride-based resins, such as PVDF, face challenges in achieving both high crystallinity and transparency due to light scattering caused by large crystal sizes, which limits their application in transparent materials.
Innovation Solution
A resin composition combining a vinylidene fluoride-based resin with an acrylic-based resin, containing a macromonomer unit, is developed, with a specific domain structure and solubility parameter difference, to refine crystal size and maintain high crystallinity, thereby reducing light scattering and enhancing transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vinylidene fluoride-based resin is used to achieve high crystallinity, then mechanical properties and heat resistance are improved, but crystal size becomes large causing light scattering and reducing transparency
Solution Approach 1:
The invention changes the chemical composition parameters by incorporating fluorinated cyclic carbonate units into the PVDF chain, which modifies the crystallization behavior and results in finer crystal size while maintaining high crystallinity, thereby reducing light scattering and improving transparency
Solution Approach 2:
The invention creates a composite polymer structure by combining vinylidene fluoride units with fluorinated cyclic carbonate units in a copolymer, achieving synergistic effects that simultaneously provide high crystallinity and fine crystal size for transparency
2Strength
If block polymer is mixed with vinylidene fluoride-based resin to improve flexibility and impact strength, then mechanical properties are enhanced, but crystallinity is reduced which affects heat resistance
Solution Approach 1:
The invention changes the molecular structure parameters by introducing fluorinated cyclic carbonate units that act as flexible segments within the polymer chain, providing impact strength without forming separate domain structures that would reduce overall crystallinity
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 resin composition effectively suppresses light scattering, achieving high crystallinity and transparency in molded articles and films, expanding their application to transparent materials like thick films and sheets.
Implementation Method 1
the crystal of the PVDF tends to grow up to a size larger than wavelengths of visible light and scatters a part of the visible light
Data Source
AI summary
The present invention provides a resin composition including a vinylidene fluoride-based resin (A), having a crystal melting enthalpy of 10 to 45 J/g as measured with a differential scanning calorimeter, and having (2) IHv of 60 or less as obtained by (1) a light scattering measurement.