Premium
Synthesis and Applications of Reactive Carbohydrates Part I: Behaviour of Carboxymethyl Starch Before and After Acid Hydrolysis Toward Grafting with Acrylamide
Author(s) -
Bayazeed A.,
Higazy A.,
Hebeish A.
Publication year - 1987
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.19870390809
Subject(s) - grafting , acrylamide , hydrolysis , starch , chemistry , monomer , polymer chemistry , acid hydrolysis , nuclear chemistry , carboxylic acid , organic chemistry , polymer
Carboxymethyl starch (CMS) was subjected to acid hydrolysis at 50°C for different periods of time. The CMS sample and the hydrolyzed CMS samples were then subjected to two independent reactions, namely grafting with acrylamide using K 2 S 2 O 8 as initiator and oxidation using K 2 S 2 O 8 under the grafting condition but in absence of the monomer. The samples were analyzed for copper number and carboxylic content before and after these two reactions. Acid hydrolysis resulted in creation – in CMS structure – of aldehydic groups which underwent partial conversion to carboxylic groups during drying. Grafting reduced significantly the copper number and so did the oxidation. The latter increased the carboxylic groups but grafting exerted opposite effect. Hydrolysis of CMS for shorter or longer periods of time enhanced the susceptibility of CMS during the initial stages of grafting. The opposite held true for the later grafting stages. Methylolation and application of grafted prehydrolyzed CMS to cotton fabrics were reported.