Synthesis and characteristics of modified polyamides based on lactames
Polimery 2003, No 2, 116
Conditions of the syntheses, by anionic polymerization method, of homo- and copolyamides based on ε-caprolactam (KL) and κ-lauryllactam (LL) modified with urea prepolymers (Table 2), obtained from tolylene diisocyanate and three various polyetheramines (polyoxyethylenediamine, polyoxypropylenediamine or polyoxypropylenetriamine - Table 1), have ben described. An introduction of flexible polyether segments into the polyamide chain has been done with the aim to increase the impact resistance. The effects of the type of amine used and copolyamides KL/LL compositions on the chosen mechanical properties (stress at break, elongation at break, impact resistance at temp. 20°C and -40°C) as well as on the contents of non-polymerized components (soluble in acetone) have been determined (Tables 3-6). Expected substantial improvement of impact resistance was reached only in the case when polyoxypropylenetriamine was used.
Keywords: polyamides, modification, polyetheramines, urea prepolymers, impact resistance
Synthesis and characteristics of modified polyamides based on lactames and polyetheramines