Abstract
Drying patterns of poly(methacrylic acid) (HPMA) and its salt neutralized half with sodium hydroxide (NaHPMA) were studied on a cover glass, a watch glass, and a glass dish. The patterns of HPMA and NaHPMA are compared with the previous observation of sodium salt of poly(methacrylic acid), NaPMA (Okubo et al. Colloid Polym Sci 287:1155–1165, 2009). HPMA and especially NaHPMA are hygroscopic, and only the macroscopic patterns were observed. However, microscopic patterns were not observed clearly especially for NaHPMA in the room atmosphere. The hygroscopy of the dried films was in the order NaPMA NaHPMA > NaPMA. The magnitude of S values of NaPMA was similar to that of poly(ethylene glycol) (PEG). HPMA, NaHPMA, and NaPMA were grouped into E, A, and A, respectively, among six groups of solutes A to F.
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