2 research outputs found
Scale Effect on the Interface Reaction between PDMS‑E Emulsion Droplets and Gelatin
In this study, the scale effect on
the interface reaction between PDMS-E emulsion droplets and gelatin
was studied systematically. The monodisperse α-[3-(2,3-epoxy-propoxy)Âpropyl]-ω-butyl-polyÂdiÂmethylÂsiloxane
(PDMS-E) emulsion droplets on different scales were prepared using
a Shirasu porous glass (SPG) membrane with a 0.5 μm pore size.
The zeta potential results showed that the surface charge density
of PDMS-E droplets decreased with the droplet scale, and the variation
went through three stages, which corresponded to the diameter ranges
of 100–450, 450–680, and 670–800 nm, respectively.
The results of Raman spectra indicated that the distribution concentration
of head groups in surfactants decreased but the polar epoxy groups
tend to be exposed on the interface with the increase in the droplet
scale. This was conducive to the nucleophilic attack of amino groups
in gelatin on the epoxy group. Thus, the conversion of amino groups
was related to the scale of the PDMS-E droplet. This study might provide
a proper way to control the rate of interfacial reaction between immiscible
macromolecule monomers
Novel Ultrasound-Promoted Parallel Synthesis of Trifluoroatrolactamide Library via a One-Pot Passerini/Hydrolysis Reaction Sequence and Their Fungicidal Activities
An ultrasound-promoted one-pot Passerini/hydrolysis
reaction sequence has been developed for the synthesis of trifluoroatrolactamide
derivatives using a diverse range of trifluoroacetophenones and isonitriles
in acetic acid. Parallel synthesis in a centrifuge tube using a noncontact
ultrasonic cell crusher was used in this study as an efficient method
for the rapid generation of combinatorial trifluoroatrolactamide libraries,
and subsequent biochemical evaluation of the resulting compounds indicated
that they possessed excellent broad-spectrum fungicidal activities. <i>N</i>-(4-chlorophenyl)-2-(4-ethylphenyl)-3,3,3-trifluoro-2-hydroxypropanamide
and <i>N</i>-(4-chlorophenyl)-3,3,3-trifluoro-2-hydroxy-2-(4-methoxyphenyl)Âpropanamide,
in particular, showed significant fungicidal activities against all
of the fungal species tested in the current study