Synthesis of hyperbranched polycarbosilane modified with cyclodextrin derivatives and its application in coated capillary electrophoresis columns

Chu, Yongjie; Xu, Wenchao; Edgar, J. Scott; Shou, Chongqi

doi:10.1002/app.34273

Cited by 11 publications

(10 citation statements)

References 16 publications

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“…Covalent coating of fused‐silica capillaries with a hyperbranched polycarbosilane polymer functionalized with HP‐β‐CD as chiral selector represents an interesting strategy for the preparation of OT‐CEC columns . The capillary with immobilized HP‐β‐CD was tested for the enantioseparation of ofloxacine and chlorpheniramine and showed baseline and partial resolution, respectively, using 40 mM phosphate buffer, pH 3.0, as mobile phase.…”

Section: New Chiral Stationary Phases and Recent Applications Of Enanmentioning

confidence: 99%

Recent advances in electrodriven enantioseparations

Jáč

Scriba

2012

J of Separation Science

110

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Capillary electromigration techniques have developed into significant analytical separation tools especially for enantioseparations. While CE can be considered a mature technique as documented by its wide applications, CEC is still in a developmental state despite many research efforts. The success of stereospecific CE separation methods is due to the high specificity and flexibility of the technique as well as the availability of many types of chiral selectors. Thus, numerous methods have been developed for the analysis of chiral compounds in chemical, biochemical, pharmaceutical, environmental, and forensic sciences. However, most reported applications deal with pharmaceuticals. The search for new chiral selectors also continued despite the fact that most applications were performed using cyclodextrins. Furthermore, CE has been combined with spectroscopic and molecular modeling studies in attempts to understand the interactions between chiral selectors and analytes. The present review focuses on recent examples of mechanistic aspects of capillary enantioseparations with regard to mathematical modeling of enantioseparations, investigations of the analyte-complex structures as well as new chiral selectors and applications of chiral analyses by CE and CEC. It covers the literature published between January 2011 and August 2012.

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Section: New Chiral Stationary Phases and Recent Applications Of Enanmentioning

confidence: 99%

Recent advances in electrodriven enantioseparations

Jáč

Scriba

2012

J of Separation Science

110

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“…Various chemical reactions can be used to prepare SiC macromolecular precursors, and among them the hydrosilylation reaction is of great interest, leading to polymers with only Si, C and H elements in their structure. More particularly, dendritic and hyperbranched structures have attracted a lot of attention, but few studies were performed on the rheological behaviour of such macromolecular materials, especially during their synthesis by monitoring their complex transformation . Particularly, the ability to synthesize gel‐like polymers with controlled kinetics could be very useful for generating porous ceramics or aerogels …”

Section: Introductionmentioning

confidence: 99%

Rheological and thermal behaviours of a hyperbranched polycarbosilane

Piriou

Viers

Lucas

et al. 2018

Applied Organom Chemis

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A hyperbranched polymer, a precursor of silicon carbide (SiC), was successfully synthesized using a hydrosilylation reaction with Karstedt's catalyst. This reaction was optimized with the use of a rheometer coupled with an infrared spectrometer. The polymeric precursor was characterized using NMR and Fourier transform infrared spectroscopies, and dynamic rheology. The polymerization reaction was followed in situ by combined rheological and infrared measurements, indicating a gel‐like behaviour for alkene conversions higher than 0.55. Overall second‐order kinetics was determined for the hydrosilylation reaction. Pyrolysis at 1400 °C led to porous materials with β‐SiC and free carbon.

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“…More specific optically active, photoresponsive, liquid crystalline, or polyhedral oligomeric silsesquioxane‐based hyperbranched polysiloxanes have also been prepared. Owing to the high degree of functionalization (leading to higher reactivity and higher molecular interactions) and the high flexibility of hyperbranched polysiloxanes, and as they keep a low viscosity and a good solubility, they have been proposed as highly reactive additives for resines, crosslinkers, macroinitiator for radical polymerization, supported catalysts, or stationary phase for capillary electrophoresis …”

Section: Introductionmentioning

confidence: 99%

“…Owing to the high degree of functionalization (leading to higher reactivity and higher molecular interactions) and the high flexibility of hyperbranched polysiloxanes, and as they keep a low viscosity and a good solubility, they have been proposed as highly reactive additives for resines, 33,39 crosslinkers, 41 macroinitiator for radical polymerization, 49 supported catalysts, 50 or stationary phase for capillary electrophoresis. 51 In our case, a one-pot strategy has been selected to prepare poly(siloxysilane)s in which the hyperbranched core is prepared by hydrosilylation of 1,7-octadiene (a bifunctional "B 2 " reagent) with the cyclic siloxane 2,4,6,8-tetramethylcyclotetrasiloxane (a tetrafunctional "A 4 " reagent). In this case, mixtures of, for example, A 3 B, A 2 B 2 , or AB 3 units are expected to be formed as intermediates during the reaction and are responsible for the branching.…”

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confidence: 99%

Synthesis of linear and hyperbranched sugar‐grafted polysiloxanes using N‐hydroxysuccinimide‐activated esters

Moukarzel

Marty

Appelhans

et al. 2013

J. Polym. Sci. Part A: Polym. Chem.

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A straightforward method for the preparation of polysiloxanes grafted with carbohydrate side groups is described. Two kinds of backbones have been functionalized, namely one‐dimensional, linear polysiloxanes, and hyperbranched poly(siloxysilane)s based on cyclotetrasiloxanes. The method enables us to keep a good integrity of the polysiloxane backbone. The introduction of intermediate activated esters as side groups on the polysiloxane backbone ensures a complete homogeneity of the reaction medium during sugar grafting in dimethyl sulfoxide, and consequently an easy grafting with the unprotected amino sugar. Solubility of the resulting polysiloxanes has been tested in various solvents. The sugar‐grafted polysiloxanes are good candidates for applications such as silicone formulations, hydrophilic silicone elastomers, interactions with metallic nanoparticles, and suspension stabilization, or as starting point for the design of more complex polysiloxanes for molecular recognition. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 3607–3618

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Synthesis of hyperbranched polycarbosilane modified with cyclodextrin derivatives and its application in coated capillary electrophoresis columns

Cited by 11 publications

References 16 publications

Recent advances in electrodriven enantioseparations

Recent advances in electrodriven enantioseparations

Rheological and thermal behaviours of a hyperbranched polycarbosilane

Synthesis of linear and hyperbranched sugar‐grafted polysiloxanes using N‐hydroxysuccinimide‐activated esters

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