Synthesis and Characterization of Carboxymethylated Cornstarch

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Pysyväisosoite

http://hdl.handle.net/10138/303225

Lähdeviite

Nurakhmetova , Z A , Kurbashev , E P , Selenova , B S , Borke , T , Aseyev , V & Kudaibergenov , S 2019 , ' Synthesis and Characterization of Carboxymethylated Cornstarch ' , Izvestiâ Nacionalʹnoj akademii nauk Respubliki Kazahstan. Seriâ himii i tehnologii , vol. 1 , no. 1 , pp. 6-15 . https://doi.org/10.32014/2019.2518-1491.1

Julkaisun nimi: Synthesis and Characterization of Carboxymethylated Cornstarch
Tekijä: Nurakhmetova, Zh. A.; Kurbashev, E. P.; Selenova, B. S.; Borke, Tina; Aseyev, Vladimir; Kudaibergenov, Sarkyt
Muu tekijä: University of Helsinki, Polymers
University of Helsinki, Department of Chemistry
Päiväys: 2019
Kieli: eng
Sivumäärä: 10
Kuuluu julkaisusarjaan: Izvestiâ Nacionalʹnoj akademii nauk Respubliki Kazahstan. Seriâ himii i tehnologii
ISSN: 2224-5286
URI: http://hdl.handle.net/10138/303225
Tiivistelmä: The aim of this study is preparation and characterization of carboxymethylated cornstarch (CMCS) for potential application as water based drilling fluids. The cornstarch was modified by sodium monochloroacetate. The structure of cornstarch and CMCS was established by H-1 NMR and FTIR spectroscopy. The degree of carboxymethylation of cornstarch determined by H-1 NMR spectroscopy was equal to 80%. The viscosity-average molecular weights (M-eta) of pristine cornstarch and CMCS calculated from Mark-Kuhn-Houwink equation [eta]=K-eta.M-a are equal to 2.15.10 (3) g.mol(-1) and 2.75.10(5 )g.mol(-1) respectively. The temperature dependent viscosity of CMCS was measured in water by Ubbelohde viscometer, while the rheological properties of CMCS in dependence of polymer concentration and ionic strength of the solution were evaluated by rheoviscometer. The thermal characteristics of samples were determined by differential scanning calorimeter (DSC) and thermogravimetric (TGA) and differential thermal analyzer (DTA). The morphological properties of cornstarch and CMCS were studied by scanning electron microscopy (SEM). The structural-mechanical, filtration and filter cake forming properties of drilling fluids and fluid loss indicators of CMCS were found.
Avainsanat: 116 Chemical sciences
cornstarch
viscosity and rheology
carboxymethylated cornstarch
drilling fluids
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