Dissipative crystallization of poly-d-lysine hydrobromide, poly-l-lysine hydrobromide, and their low-molecular-weight analogs

Drying dissipative structures of aqueous solutions of poly-d-lysine hydrobromide, poly-l-lysine hydrobromide, and their low-molecular-weight analogs were studied on a cover glass, a watch glass, and a Petri glass dish. Size of the broad rings, one of the typical macroscopic patterns, decreased as the solute concentration decreased. Microscopic drying crystal patterns of polylysine hydrobromides and their low-molecular-weight analogs, i.e., d-, l-, and dl-lysine hydrochloride changed as a function of the distance from the film center, which is one of the typical features of dissipative crystallization. Macroscopic and microscopic drying patterns were quite similar to each other irrespective of their stereospecificity. The crystal patterns of the mixtures of poly-d-lysine hydrobromide and poly-l-lysine hydrobromide were also similar to those of the corresponding single-component polymers. The stereospecific effects were not observed in this work.