The preparation of starch carbamates of wrinkled pea starch in homogeneous
phase catalysed by dibutyltin dilaurate in DMSO as solvent is described. Th
e empfloyed isocyanates have linear alkyl chains with 7, 9, 11, 15 or 18 ca
rbon atoms. Starch carbamates with equal degrees of substitution and differ
ent alkyl chains lengths were synthesised in a reaction flask. The preparat
ion of carbamates with equal alkyl chain length and different degrees of su
bstitution was also possible. The structures of the polymers were character
ised by elemental analysis, IR- and H-1-NMR-spectroscopy. The behaviour of
the prepared starch carbamates under thermal loading was investigated by us
ing Differential Scanning Calorimetry (DSC) and a hot press. In addition, f
or 1-undecyl isocyanate the starch carbamate was prepared both in a kneader
and an extruder. The differences in reaction conditions and the results we
re discussed.