Stabilization of polypropylene by esters of 2,2,6,6 ‐ tetramethyl 4‐piperidinole

Abstract

STABILIZATION OF POLYPROPYLENE BY ESTERS OF 2,2,6,6 -TETRAMETHYL 4 -PIPER ID I NOL E ai4arta Povaiancov5, aPeter Danko, aMilan Karva5, bMarta Klimov6, 'Pavol ZauEik, 'Jtilius Our:tlisThe eifcct of the sabstituznts R and X in esters of 2,2,6,5-tetra-methy<.-! -piperidinole of t i i s general formula 1 (311 tha,r stabilizing efficien-y in polypropylene was investigated. As the subslituents R , the aliphatic alkyls CH3(CH2),, were used, whc?re 11=0-15, X=H. !3y thc derivative where R is an alkyl with 1 3 t~ 17 carbon aioms the sffect of the substituent X was also investigated where X is ti, O', OH, OR.' Both the thermooxidation and photooxidation stability of PP uers found to be increased with the insrcasing chain length R. The effect of the substituents X is various. Both ;NO' and ZN-Oii stabilizers have high efficiency during the processing of PP. At the long-term thermooxidation stress, the IN-OR,' 74-0' and -N -O H derivatives are more efficient than,;N-H compounds which are the most efficient against the effect of the ultraviolet radiation and photooxidation.