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14:32 Sep 13, 2017
This question was closed without grading. Reason: Other
English to Russian translations [PRO] Law/Patents - Chemistry; Chem Sci/Eng / Полимерная композиция для топливопроводов
English term or phrase:end group differential
The polyamine-polyamide copolymers can be prepared by various methods.
One means is to initially charge the polyamide-forming monomers and the polyamine together and to conduct the polymerization or polycondensation.
However, a preferred process involves first, if appropriate, conducting the lactam cleavage and the prepolymerization in the presence of water in a two-stage process (alternatively, the corresponding ω-aminocarboxylic acids or diamines and dicarboxylic acids are used and prepolymerized directly); the polyamine is added in the second step.
Then the system is decompressed at temperatures between 200 and 290°C and polycondensation is effected in a nitrogen stream or under reduced pressure.
A further preferred process involves the hydrolytic degradation of a prepolyamide to give a pre-polymer and simultaneous or subsequent reaction with the polyamine.
Preference is given to using polyamides in which the end group differential is approximately zero.
By these methods, it is possible to prepare ultra-highly branched polyamides having acid numbers less than 40 mmol/kg, preferably less than 20 mmol/kg and more preferably less than 10 mmol/kg.
На английский переводили с немецкого, но и так похожий термин - Endgruppendifferenz.