Flexible displays are a systematic revolution in the field of display, in which high-performance and high-barrier polymer substrates are considered to be one of the most important key materials. In this work, high water vapor barrier polyimides containing amide moieties were synthesized via the ternary polymerization of 4,4 -diaminobenzailide (DABA), 4,4 -diaminodipheny ether (ODA), and 3,3 ,4,4 -biphenyl-tetracarboxylic acid dianhydride (BPDA) followed by thermal imidization. The relationship between the content of amide moieties and the water vapor barrier property of the prepared polyimides was studied by means of density test, water absorbing test, water contact angle test, water vapor permeation test, fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), thermogravimetry coupled with fourier transform infrared spectrometry (TG-FTIR), wide-angle X-ray diffraction analysis (WXRD), mechanical performance test, etc. The results show that the introduction of amide groups into polyimide (PI) main chains can improve the water vapor barrier properties of the polyimides effectively. The water vapor transmission rate (WVTR) of the polyimide films can be improved from 8.2365 g·(m 2 ·24 h) −1 to 0.8670 g·(m 2 ·24 h) −1 with the increasing content of amide moieties.
Biosensing
applications require signal reporters to be sufficiently
stable and biosafe as well as highly efficient. Aggregation-induced
emission (AIE) nanoparticles have proven to be capable of cell-imaging
and cancer therapy; however, realizing sensitive detection of biomolecules
remains a great challenge because of their instability, biotoxicity,
and lack of modifiable functional groups. Herein, we report a self-assembling
strategy to fabricate AIE nanoparticles (PTDNPs) through the dispersion
of amphiphilic polymers (PTDs) in phosphate-buffered saline. The PTDs
were prepared through radical copolymerization of N-(1,2,2-triphenylvinyl)-4-acetylaniline and dimethyl diallyl ammonium
chloride. We found that the particle size, morphology, functional
groups, and fluorescence property of PTDNPs can be fine-tuned. Further,
PTDNPs-0.10 were chosen as signal reporters to detect organophosphorus
pesticides (OPs) with the aid of gold nanoparticles. Their sensing
performance on OPs is superior to that using C-dot/quantum dot/rhodamine
B as the signal reporter. This study not only provides new possibilities
to fabricate novel AIE nanoparticles with exceptional properties,
but also facilitates the AIE nanoparticle’s application for
target analyte biosensing.
Precision regulation of the dielectric polarization and dielectric loss of polymer materials, developing intrinsic high-performance polymers with high dielectric constant, low dielectric loss and excellent temperature resistance are very challenging....
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