ISSN:
0025-116X
Schlagwort(e):
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Physik
Notizen:
Poly(β-aminoester)s 7 - 12, containing in the repeating unit ethylenebis(carbonyloxy-1,4-phenylene)carbonyloxy groups interconnected by polymethylene segments of different length and coupled by diamino spacers, were synthesized from mesomorphic diacrylates and secondary diamines. The thermal behavior and the solution properties of the polymers were investigated. Depending on the structure of the repeating unit, the polymers were found to give rise to either isotropic or anisotropic melts. The incidence and extension of the mesophase are favored in poly(β-aminoester)s based on even numbered methylene segments and 2-methylpiperazinediyl spacers. The polymer samples were found to degrade at room temperature, when dissolved in solutions containing water, an organic base or an acid. Based on a macromolecular model compound (14) a degradation process is suggested involving a selective cleavage of the benzoate ester groups assisted by the amino groups in β-position.
Zusätzliches Material:
5 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/macp.1988.021890404
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