Process parameters of microsphere preparation based on propylene carbonate emulsion-precursors

2020 ◽  
Vol 38 (1) ◽  
pp. 1-10
Author(s):  
Daris Grizić ◽  
Alf Lamprecht
Keyword(s):  
Propylene Carbonate ◽  
Process Parameters ◽  
Microsphere Preparation

scholarly journals Unusual Regularities of Propylene Carbonate Obtained by Propylene Oxide Carboxylation in the Presence of ZnBr2/Et4N+Br− System

2019 ◽  
Vol 3 (2) ◽  
pp. 46
Author(s):  
Alexander R. Elman ◽  
Sergei A. Zharkov ◽  
Liudmila V. Ovsyannikova
Keyword(s):  
Induction Period ◽  
Propylene Carbonate ◽  
Process Parameters ◽  
Propylene Oxide ◽  
Reaction Rate ◽  
Kinetic Method ◽  
Main Process ◽  
Turnover Frequency ◽  
Rapid Formation ◽  
Period Duration

The aim of the work was to study the unusual regularities of propylene carbonate prepared by carboxylation of propylene oxide in the presence of the catalytic system ZnBr2/Et4N+Br−. Using the kinetic method, a long induction period was detected, followed by the rapid formation of propylene carbonate in a quantitative yield, where the maximum turnover frequency (TOF) values reached 21,658 h−1. The regularities of the influence of the main process parameters on the induction period duration and the reaction rate were established. Based on the results obtained and considering the literature, assumptions about the mechanism of the process were proposed and ways for its further study were outlined.

Halogenation of ORMOSIL: A Promising Rout for Tailoring Optical Absorptions

2003 ◽  
Vol 771 ◽  
Author(s):  
Amir Fardad ◽  
Wei Liang ◽  
Yadong Zhang ◽  
Bryson Case ◽  
Shibin Jiang ◽  
...  
Keyword(s):  
Process Parameters ◽  
Sol Gel ◽  
Fiber Amplifiers ◽  
Grignard Reaction ◽  
Coupling Loss ◽  
Beam Splitters ◽  
Silicon Technology ◽  
Sol Gel Process ◽  
Propagation Losses ◽  
Signal Intensities

AbstractFluorinated and photo-imageable precursors are synthesized through a Barbier-Grignard reaction for 1550-nm window. The precursors are used for the sol-gel process of integrated optic components for silica-on-silicon technology. Material compositions and process parameters are optimized to achieve internal absorptions >0.1 dB/cm and propagation losses of about 0.5 dB/cm at 1550 nm. Compact 1×16 Beam splitters are designed and fabricated which exhibit >0.3 dB power uniformity, >0.1 dB PDL and 1.5 dB coupling loss. By hybrid integration of the passive splitters and in-house fiber amplifiers, amplifying splitters are demonstrated at various signal intensities.

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