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Synthesis and properties of carbamoylethyl starch

Rupiński S., Brzozowski Z. K.

Polimery

2003

T. 48, nr 2

122-129

A new ecological and simple method of acrylamide derivatives of starch (carbamoylethyl starch CrES) obtaining, consisting in starch modification using Michael addition reaction in base environment, was elaborated. The course of starch degradation (with the aim to decrease its molecular weight) was investigated as well as the course of substitution reaction of starch with acrylamide dependently on the amounts (concentrations) of bases used (NaOH and KOH). The effects of temperature, reaction time and amount (part) of acrylamide added on degree of substitution (DS) were studied. CrES structure was confirmed using the following methods: MALDI TOF, FT-IR spectroscopy, DSC and X-ray diffractometry. Molecular weight distribution of starch modification, what can be controlled by degradation time, was determined using massspectrometry. Modified starch was well soluble in water and their aqueous solutions, concentrated up to 40%, were obtained. The effects of solution concentration and degree of substitution on the solution viscosity dependently on the shear rate have been studied. The influence of DS value and temperature on the solubility of CrES in water has been established too.