2001 Volume 50 Issue 3 Pages 316-321
Viscoelastic properties of organic hybrid materials prepared from various types of phenylbenzotriazole compounds (FB) as additive and chlorinated polyethylene (CPE) as matrix are investigated by means of dynamic mechanical analysis. When 60.5vol% of 2-[2-hydroxy-3, 5-bis (α, α' dimethylbenzyl) phenyl]-2H-dibenzotriazole (FB990) is loaded, the maximum tanδ of the organic hybrid material increases 2.7 times and the temperature at maximum tanδ shifts more than 30°C, compared with those of CPE. At the temperature range of 20-35°C, FB990 increases both storage modulus and tanδ of the organic hybrid material. On the other hand, 2-(5-methyl-2-hydroxyphenyl) benzotriazole (FB100) decreases tanδ, since it exists in the state of crystal in the polymer matrix. Long alkyl and phenyl groups tend to prevent crystallization of FB and to increase tanδ of the organic hybrid material. Further, Cl group of FB improves the compatibility between additive and CPE. The study of the glass transition temperature of CPE (-17°C), the organic hybrid materials and FB990 (35.5°C) by using differential scanning calorimeter shows that there is slightly negative interaction between the FB990 and CPE, leading to the formation of micro agglomeration of FB990 in the polymer matrix. Alumina, which is loaded to organic hybrid material as inorganic filler, increases storage modulus and loss modulus. At this time, the tanδ of the composite can be calculated from the tanδ and volume fraction of the organic hybrid material.
