Decreased oxygen permeability of EVOH through molecular interactions

摘要: Poly(ethylene-co-vinyl alcohol) of 48 mol% ethylene content was modified with N,N!-bis(2,2,6,6-tetramethyl-4- piperidyl)-isophthalamide (Nylostab SEED) to decrease the oxygen permeability polymer. The additive added in a wide concentration range from 0 10 wt%. structure and properties polymer were characterized various methods including differential scanning calorimetry, X-ray diffraction, mechanical testing, optical measurements oxy- gen permeation. Interactions estimated by molecular modeling infrared spectroscopy. results showed that permeation decreased considerably when at less than 2.0 wt% concentration. resulted interaction hydroxyl groups amide additive. dissolution led crystallinity, but also mobility amorphous molecules. Stiffness strength, deformability increased as result. Above 2 forms separate phase leading deterioration properties. success approach represents novel way control EVOH other polymers similar functional capable strong interactions.