With terephthaloyl chloride sulfonates

Some results of the modification of lignin sulfonate Ultra B002 by reaction with terephthaloyl chloride are summarized in Table VI. The total hydroxyl content of the lignosulfonates as well as their derivatives are presented in Table VII. The hydrolytic resistance of selected products is evaluated in Table VIII. The results presented in Tables VI-VIII stress several advantages of the derivatives with terephthaloyl chloride. The modified lignin sulfonates were insoluble, or only very slightly soluble, in organic solvents. They were, however, soluble in dimethyl sulfoxide. Ordered structures were identified by X-ray studies (16,17). 

The modification of lignin sulfonates with terephthaloyl chloride produces new polymeric materials containing ester groups. This modification can be used to utilize lignins also for improvement of chemical fiber properties. This is presently under investigation. 

Table VII. Total Hydroxyl Content of Lignin Sulfonates and Their Derivatives with Terephthaloyl Chloride.

Table X. Activation Energy of the Degradation Process of Selected Lignin Sulfonates as well as their Derivatives with Terephthaloyl Chloride...

In conclusion, the hydroxyl terminated poly(arylene ether sulfone) oligomers of controllable molecular weight were synthesized by the NMP/K CO route. These oligomers were isolated and reacted in a second step with terephthaloyl chloride with or without added biphenol to form segmented copolymers. This second reaction was performed either in solution or interfacial-ly. It was found that the interfacial process allowed a higher percentage... 

Schotten-Baumann reaction Consists of reactions diamines or dials with acid chlorides of diftmctional carboxylic or sulfonic acids to yield high polymers in which degrees of polymerization of well over 100 are easily attainable e.g., step-growth polymerization in the condensation polymerization of terephthaloyl chloride with ethylene glycol to form poly(ethylene tere-phthalate). Odian GC (2004) Principles of polymerization. John Wiley and Sons Inc., New York. 

The presence of iodine is known to catalyse the chlorination of organic compounds by chlorosulfonic acid, enabling the reaction to proceed under comparatively mild conditions. So chlorination is a feature of the attempted sulfonation of aromatic iodo compounds with chlorosulfonic acid (see Chapter 2, p 19) for instance, reaction of />-diiodobenzene with excess reagent (five equivalents) at 50 C yields tetrachlorodiiodobenzene (82%), (Chapter 6, ref. 13). The chlorination is catalysed by traces of iodine and the reaction under these conditions probably involves both homolytic and heterolytic steps (see Chapter 4, p 49). Hexachloro-/7-xylene, by treatment with a mixture of chlorosulfonic acid, iodine and chlorine afforded either the 2,5-dichloro derivative or tetrachloro-terephthaloyl chloride depending on the experimental conditions (see Chapter 4, p 51). 

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