Reversible crosslinking in cellulose. II. Mono‐and bifunctional reactions of bis‐β‐isocyanatoethyl disulfide with cotton

摘要

AbstractBis‐β‐isocyanatoethyl disulfide (BIED) was synthesized from diethyl dithiodipropionate and its reaction with cotton in dimethylformamide was investigated. The sulfur content of the treated cotton decreased by reduction with tri‐n‐butylphosphine. The polarographic and infrared analyses revealed that BIED reacted with cotton both monofunctionally and bifunctionally to form branches and crosslinks, respectively. The ratio of the crosslinks to the total amount of BIED combined increased in general as the reaction progressed. X‐Ray study indicated that the reaction took place mainly in the original amorph