Abstract
Heterogeneous sulphation of cellulose with a mixture of H2SO4/propanol has been studied as a possible method for obtaining sodium cellulose sulphate suitable for the preparation of capsules by polyelectrolyte complex formation. Product parameters like water solubility and DS as well as viscosity of the water soluble parts of the sodium cellulose sulphate preparations have been investigated for their dependence on reaction conditions like time, temperature, or molar ratio H2SO4/propanol. Capsule formation was tested with poly-(diallyldimethyl ammonium chloride) as cationic counterpart. Capsule properties such as size, mechanical strength, or dry mass and thickness of the capsule wall were compared with those of capsules generated from cellulose sulphate preparations obtained under homogeneous reaction conditions.
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