No abstract

In the field of flexible electronics manufacturing, inkjet printing technology is a research hotspot, and it is key to developing low-temperature curing conductive inks that meet printing requirements and have suitable functions. Herein, methylphenylamino silicon oil (N75) and epoxy-modified silicon oil (SE35) were successfully synthesized through functional silicon monomers, and they were used to prepare silicone resin 1030H with nano SiO2. 1030H silicone resin was used as the resin binder for silver conductive ink. The silver conductive ink we prepared with 1030H has good dispersion performance with a particle size of 50–100 nm, as well as good storage stability and excellent adhesion. Additionally, the printing performance and conductivity of the silver conductive ink prepared with n,n-dimethylformamide (DMF): proprylene glycol monomethyl ether (PM) (1:1) as solvent are better than those of the silver conductive ink prepared by DMF and PM solvent. Cured at a low temperature of 160 °C, the resistivity of 1030H-Ag-82%-3 conductive ink is 6.87 × 10−6 Ω·m, and that of 1030H-Ag-92%-3 conductive ink is 0.564 × 10−6 Ω·m, so the low-temperature curing silver conductive ink has high conductivity. The low-temperature curing silver conductive ink we prepared meets the printing requirements and has potential for practical applications.

The reaction of poly(vinyl alcohol) with glutaraldehyde (GA) at different molar ratio was systematically studied. By this reaction, white particles functionalized with aldehyde groups were obtained and their diameters were found to be between 50 and 150 nm. The amount of free ACHO groups on the surface of the particles reached more than 1.6 mmol/g by adjusting the ratio of n(GA)/n(AOH). The free ACHO groups were then converted into alkyl amino, aromatic amino, and hydrazide groups by coupling with hexamethylene diamine, m-phenylene diamine, and adipic dihydrazide, respectively, and the length of the spacer was also prolonged. Finally, a series of sugar-particle conjugates were prepared by directly coating the functionalized particles with maltose,and heparin. The anticoagulant experiments show that the heparin immobilized on the aldehyde-and hydrazide-functionalized particles is still biologically active.

A facile and effective organic synthesis route was provided for preparation of the carbohydrate coated polymer small particles. First, amino-activated particles were prepared from PAN (polyacrylonitrile) by the heterogeneous cross-linking method, then the amino groups on the particle were converted into hydrazide groups by N-alkylation and hydrazine activation, meanwhile the length of linker was prolonged to the designed value. FTIR (Fourier Transform Infrared Spectroscopy) was used to study the reactions in the synthesis steps and to optimize part of the synthesis conditions. Two carbohydrates (maltose and heparin) were then directly coupled to the hydrazide-activated particles in a relative high yield, the obtained particles were used to interact with BSA (bovine serum albumin) and typical heparin-binding proteins. All of these particles had some nonspecific interactions with proteins and heparin coated particles showed additional strong binding ability with the heparin-binding proteins. Data also showed that a longer linker length not only weakened nonspecific interaction but also increased the specific binding ability. As the carbohydrate coated particles are independent, flexible and easily detectable, they should be good acceptors for the diverse bioactive studies of carbohydrates.