Structural memory in chromium coordinated polyamides
Review articleOpen access

AbstractIt was established by X-ray diffractometry that swelling agents caused a γ → α transition in chromium coordinated polyamides. This structural memory effect can well be interpreted by the formation of the mixed complex, [Cr(COamide)n(H2O)6−n]3+ proposed previously. The structure controlling the increase in the melt viscosity corresponds to n ⩾ 2 while a treatment with a swelling agent (e.g. water) results in a complex structure of n ⋍ 1 by ligand exchange. The latter involves a destruction of the partly crosslinked structure conferring the possibility of the structural memory.

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