Illb 7.30 (8.0) °All spectra run on Varían A-60 spectrophotometer. Chemical shifts given in parts per million relative to tetramethylsilane as internal standard.6 All peaks are singlets. Relative peak areas correspond to number of protons in each group. 'All doublets; area = 2. "'Coupling constants (J) in cps. J values are JHiHs = =/ 6 where aromatic rings are numbered starting with carbon bearing carbomethoxy or carboxy substituent in all cases.We acknowledge the assistance of Larry Echelberger.

Eleven N-arylcarbamylated celluloses were prepared by a pad-cure treatment of cotton with phenyl N-arylcarbamates as isocyanate generators. Add-ons up to 8.5% were obtained by impregnating the fabric with a dimethylformamide (DMF) solution of the phenyl carbamate and curing at 180-200°C for 4-5 min. The extent and efficiencies of these cotton cellulose reactions were observed by means of add-ons, nitrogen contents, and change in pickup of acid dyes. The activating aryl substituents were dialkylamino, methoxyl, methylthio, and methyl electron-donating (+E) groups. N-pyridylcarbamates were also used. The modified cotton fabrics exhibited improved rot resistance and those containing amine groups had ion-exchange properties. '

353pressure, resulting in the breaking and reforming of secondary valenre honds in the amorphous regions. 1'a&dquo;a~;lia ~ -1· ~ has shown the effect of pressure in lowering the second-order transition temperature of polypropylene..' ~,The level of crease retention in a fabric set hv this process should 1>e an index of the second-order transition temperature of cellulose at a given mechanica! pressure. However, the exact mechanism hy which durable creases are established in cellulosic fabrics by the present high-temperature, hif.{h-pressure. short-time process remains to be elucidated. ' AcknowledgmentThe experimental work was carried out with the assistance of :B1 rs. Erzelet Toth and Mrs. Abstract A report is presented on the role of spatial environment of reaction sites in reversible cross-linking of cotton. The differences between systems in which cross links are introduced by reaction with difunctional compounds and those in which cross links are formed by reacting substituent groups placed randomly on cellulose chains are discussed.The systems studied were monoand difunctional dyes on cotton cellulose and acethydrazide disulfide on dialdehyde cotton. Using cupriethylenediamine hydroxide (cuene) insolubility as the criteria for cross-linking, it was'found that the paired placed reaction sites cross-linked more readily than did those placed in a random fashion on the cellulose chain.