Reversible Thermochromic Properties of 2,6-Monosubstituted Aromatic Phenolic Resin and Its Composite Film.

2, 6-monosubstituted aromatic phenolic resin (IPD-BPA-TPD) was prepared by microwave-assisted method using bisphenol A (BPA), terephthalaldehyde (TPD) and isophthalaldehyde (IPD) as co-condensation monomers based on an open system and solution polycondensation method. A reversible thermochromic nickel-based butadiene rubber film was prepared using resin as a chromogenic agent. The resin was tested by a gel permeation chromatograph, a nuclear magnetic resonance hydrogen spectrometer, a nuclear magnetic resonance carbon spectrometer, a thermogravimetric analyzer and a thermal analyzer. The composite film was tested by a thermogravimetric analyzer, a thermal analyzer, a spectrophotometer and a polarizing microscope. The thermochromic properties, thermal stability, thermal cycle stability and microstructure of the film were studied. The results show that the M_n of IPD-BPA-TPD is 1.133x10³ g/mol, the PDI is 1.005. The total color difference ΔE of the composite film reaches about 90 in the low temperature section (12~38 °C) of the constant-rate cooling phase transition, and the absorption/scattering color depth difference Δ (K/S) reach about 15 and 40 in the visible regions of 480~600 nm and 600~660 nm, and film has good thermal stability and thermal cycle stability. [ABSTRACT FROM AUTHOR]