ISSN:
0025-116X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Interpolymer reactions between poly(acrylic acid) (PAA) or poly(methacrylic acid) (PMAA) and poly(N-tert-butylaziridine) (PTBA) were studied and compared with the corresponding reactions of these polyacids with linear polyethyleneimine (LPEI). In aqueous alkaline and salt media the presence of the bulky non-polar N-substituent in the main chain of PTBA results in a decrease of stability of polyacid-PTBA polyelectrolyte complexes. LPEI, which forms stronger salt bonds with PAA, substitutes PTBA in the PAA-PTBA polyelectrolyte complexes. Addition of simple salts to aqueous solutions of non-stoichiometric polyelectrolyte complexes (N-PEC) PAA-PTBA and PMAA-PTBA at room temperature causes a phase separation due to macromolecular exchange and disproportionation reactions. At elevated temperatures (T = 40 - 60 °C), however, the macromolecular exchange between different N-PEC particles does not occur and phase separation in aqueous salt solution of the N-PEC's PAA-PTBA, PMAA-PTBA is not observed. This is attributed to hydrophobic interactions in polyacid-PTBA complexes due to the presence of the tert-butyl groups in the latter.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1986.021870512
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