Synthesis and Characteristic Valuation of a Thermoplastic Polyurethane Electrode Binder for In-Mold Coating

A polyurethane series (PHEI-PU) was prepared via a one-shot bulk polymerization method using hexamethylene diisocyanate (HDI), polycarbonate diol (PCD), and isosorbide derivatives (ISBD) as chain extenders. The mechanical properties were evaluated using a universal testing machine (UTM), and the the...

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Bibliographic Details
Published in:Polymers 2024-01, Vol.16 (3), p.375
Main Authors: Hong, Suk-Min, Kwon, Hyuck-Jin, Sun, Jung-Min, Lee, Chil Won
Format: Article
Language:English
Subjects:
Analysis
Bulk polymerization
Chemical synthesis
Dispersion
Electrical resistance
Electrodes
Elongation
Flakes
Fourier transforms
Heat resistance
Hexamethylene diisocyanate
In-mold coating
Injection molding
Mechanical properties
Methods
NMR
Nuclear magnetic resonance
Physical properties
Polymerization
Polyurethane resins
Polyurethanes
Resins
Silver
Solvents
Substrates
Tensile strength
Thermal properties
Thermal resistance
Thermodynamic properties
Thermogravimetric analysis
Thermoplastics
Urethane thermoplastic elastomers
Viscosity
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Summary:A polyurethane series (PHEI-PU) was prepared via a one-shot bulk polymerization method using hexamethylene diisocyanate (HDI), polycarbonate diol (PCD), and isosorbide derivatives (ISBD) as chain extenders. The mechanical properties were evaluated using a universal testing machine (UTM), and the thermal properties were evaluated using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The PHEI-PU series exhibited excellent mechanical properties with an average tensile strength of 44.71 MPa and an elongation at break of 190%. To verify the applicability of different proportions of PU as an electrode binder, PU and Ag flakes were mixed (30/70 wt%) and coated on PCT substrates, the electrodes were evaluated by four-point probe before and after 50% elongation, and the dispersion was evaluated by scanning electron microscopy (SEM). The electrical resistance change rate of PHEI-PU series was less than 20%, and a coating layer with well-dispersed silver flakes was confirmed even after stretching. Therefore, it exhibited excellent physical properties, heat resistance, and electrical resistance change rate, confirming its applicability as an electrode binder for in-mold coating.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym16030375