Synthesis and properties of carbamoylethyl starch

Rupinski, Slawomir; Brzozowski, Zbigniew K.

doi:10.14314/polimery.2003.122

Cited by 4 publications

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“…The goal of the presented investigation was the evaluation of the possibility of application of our newlyelaborated starch derivatives [14][15][16][17]: St-Aam (graft copolymer of acrylamide onto starch) [14], CrES (carbamoylethylated starch) [18][19][20], CrE-DHPS (carbamoylethyl-dihydroxypropylated starch) [21], DHPS (dihydroxypropylated starch) [22] as the inhibitors of the argillaceous rock hydration and regulators of the filtration when applied in the mud drilling fluids. Newly obtained starch derivatives were also generally tested […”

Section: Study On the Application Of Starch Derivatives As The Regulamentioning

confidence: 99%

Study on the Application of Starch Derivatives as the Regulators of Potassium Drilling Fluids Filtration

Rupinski¹,

Brzozowski

Uliasz³

2009

ChChT

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Derivatives of starch, such as graft copolymer of acrylamide onto starch, carbamoylethylated starch, carbamoylethyl-dihydroxypropylated starch, and dihydroxypropylated starch have been tested for their properties as components of drilling fluids used for clay inhibition and for the regulation of their rheology. The influence of modified starch and their blends with tylose as protective agents in the filtration of drilling fluids, as well as replacement of tylose, by modified starch were investigated. The viscosity, flow limit, filtration, pH, and dispersion as factors of the properties of potassium drilling fluids with the addition of starch derivatives were determined.

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Section: Study On the Application Of Starch Derivatives As The Regulamentioning

confidence: 99%

Study on the Application of Starch Derivatives as the Regulators of Potassium Drilling Fluids Filtration

Rupinski¹,

Brzozowski

Uliasz³

2009

ChChT

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“…KOH jest bardziej skutecznym katalizatorem podstawienia CrES (DS = 0,28), ni¿ Ca(OH) 2 (DS = 0,18). Stosowanie KOH jako katalizatora daje podobne wyniki jak w przypadku prowadzonych przez nas w ostatnich latach reakcji modyfikacji skrobi wobec NaOH [1]. Karbamoiloetylowane pochodne degradowanej chemicznie skrobi dobrze rozpuszczaj¹ siê w zimnej wodzie (temp.…”

Section: Podsumowanieunclassified

“…Dlatego te¿ wiele prac badawczych jest pooewiêconych modyfikacji skrobi w celu polepszenia jej rozpuszczalnooeci w wodzie, a tak¿e innych w³aoeciwooeci. Wzrost rozpuszczalnooeci skrobi mo¿na uzyskaae w wyniku degradacji chemicznej [1,2] lub hydrolizy kwasowej [3] i enzymatycznej [4][5][6][7][8] b¹dŸ te¿ na drodze chemicznej modyfikacji, takiej jak utlenianie [9,10], estryfikacja [11], eteryfikacja [12][13][14] i szczepienie [15,16].…”

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A new method of poly(aspartic acid) synthesis under microwave radiation

Polaczek

Pielichowski

et al. 2005

Polimery

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Streszczenie-Opisano dwie metody syntezy karbamoiloetylowanych pochodnych skrobi (CrES) obejmuj¹ce etapy degradacji (chemicznej b¹dŸ enzymatycznej pod wp³ywem α-amylazy) oraz etap reakcji addycji z akryloamidem. Zbadano wp³yw warunków degradacji enzymatycznej (biodegradacji) na rozpuszczalnooeae w wodzie CrES, lepkooeae jej roztworów wodnych, stopieñ podstawienia (DS) i ciê¿ar cz¹steczkowy. Scharakteryzowano wp³yw opisanej modyfikacji skrobi na zmiany struktury jej powierzchni. S³owa kluczowe: skrobia, karbamoiloetylowanie, stopieñ podstawienia, degradacja enzymatyczna, α-amylaza, rozpuszczalnooeae w wodzie, ciê¿ar cz¹steczkowy, struktura powierzchni. WATER-SOLUBLE CARBAMOYLETHYLATED DERIVATIVES OF POTATO STARCH. PART I. SYNTHESIS AND STRUCTURE Summary-Water-soluble starch derivatives (CrES) containing carbamoylethyl groups were synthesized using two methods. The first based on chemical degradation of native potato starch under the influence of KOH or NaOH and subsequent reaction of addition with acryloamide. The other based on carbamoylethylation of native starch in such reaction and subsequent enzymatic biodegradation of CrES obtained using α-amylase. The effects of biodegradation conditions, namely: catalyst type and concentration [Ca(OH)2, KOH], time and temperature of the process and α-amylase concentration on CrES solubility in the water and viscosity of aqueous solutions obtained (Table 1 and 6) as well as on the degree of substitution (DS, Table 2-5). The lowering of molecular weight of starch products after degradation, either chemical or enzymatic one, positively influences the solubility of CrES in water (results of MALDI-TOF measurements, Fig. 1, 2 and 6). The modification causes also the changes in the surface structure of CrES facilitating its dissolution in water (results of SEM microscopic investigations, Fig. 3 and 7). Chemical structure of CrES was confirmed by FT-IR method (Fig. 4, 5 and 8).

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“…Carbamoylethyl modification of starch can be achieved by the reaction of starch with acrylamide in a base‐catalyzed, Michael‐type addition to etherify with amide (OCH 2 CH 2 CONH 2 ) substituents 1. Rupinski and Brzozowski explored the effects of temperature, reaction time, and acrylamide concentration on the degree of substitution (DS) of starch 10. The modified starch shows positive effect in raising the mechanical behaviors of sized cotton yarns when applied to sizing trials 11.…”

Section: Introductionmentioning

confidence: 99%

Carbamoyl ethylation of starch for enhancing the adhesion capacity to fibers

Zhu

Chen

2007

J of Applied Polymer Sci

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The influence of starch carbamoylethylation upon the adhesion capability of starch to pure cotton, all polyester, and polyester/cotton blend fiber substrates were investigated. The carbamoylethyl starch was prepared by the reaction of starch with acrylamide in an aqueous dispersion. The capability was evaluated in terms of the maximum strength and work-to-break of a roving impregnated with the starch pastes. The mechanical behaviors of the adhesive layers were estimated through a method by casting starch films and then by measuring their behaviors under controlled condition. It was found that the carbamoylethylation is an effective means for enhancing the adhesion of starch to fibers. No matter what type of the fibers is used, the adhesion capability obviously enhances compared with those of unmodified starch, even if the degree of substitution is at a very low level. The capacity increases steadily as the modification extent increases. Moreover, the experimental results are also discussed and analyzed especially through the failure type, internal stress, stress concentration, and mechanical behaviors of the adhesive layers among fibers.

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Synthesis and properties of carbamoylethyl starch

Cited by 4 publications

References 0 publications

Study on the Application of Starch Derivatives as the Regulators of Potassium Drilling Fluids Filtration

Study on the Application of Starch Derivatives as the Regulators of Potassium Drilling Fluids Filtration

A new method of poly(aspartic acid) synthesis under microwave radiation

Carbamoyl ethylation of starch for enhancing the adhesion capacity to fibers

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