Abstract: A mixture comprising at least one polyfunctional chain extender having at least three reactive groups, and at least one mono- or difunctional hydrolysis stabilizer, where the chain extenders and the hydrolysis stabilizers react with the terminal groups of polymers in the molten or solid state of the polymers to form a chemical bond. Use of such mixtures as stabilizers for polymers. Methods for stabilizing polymers with respect to molecular weight loss, where an effective amount of such a mixture is added to the polymer.

Abstract: Oligomeric carbodiimides comprising at least one heterocyclic end group are used as stabilizers for polymers. The oligomeric carbodiimides may be compounds of the general formula (I), where A1, A2 are each independently, identically or differently, hydrocarbon groups having 2 to 20 carbon atoms, B1, B2 are each independently, identically or differently, heterocycles, C1-C30-alcohols, polyetherols, polyesterols, amines, polyether amines, polyester amines, thioalcohols, polyether thiols, polyester thiols, R1, R2 are each independently, identically or differently, n is an integer from 2 to 100, and wherein A1, A2, B1 and B2 may each be substituted at any desired position by C1-C20-alkyl, C2-C20-alkenyl, C2-C20-alkynyl, C1-C20-alkoxy, carbonyl oxygen (?O) or halogen, with the proviso that at least one B1 or B2 substituent is a heterocyclic end group. Processes for stabilizing polymers against hydrolysis using oligomeric carbodiimides are also disclosed.

Abstract: The present invention relates to a process for producing metal oxide nanofibers using a sol-gel precursor. The nanofibers produced by the process according to the invention are notable for an increased metal oxide content compared to the prior art.