PROPERTIES OF ETHYLENE 1-OCTENE, 1-TETRADECENE AND 1-OCTADECENE COPOLYMERS OBTAINED WITH CP(2)ZRCL(2) MAO CATALYST - EFFECT OF COMPOSITION AND COMONOMER CHAIN-LENGTH/

Copolymers of ethylene and 1-octene, 1-tetradecene and 1-octadecene we re synthetized in order to study the effect of the comonomer chain len gth and amount on density, melting temperature and heat of fusion. The y were also compared with the properties of the copolymers obtained wi th the heterogeneous titanium catalyst. It could be seen that the dens ity/melting -area of the copolymers obtained with the zirconocene cata lyst was much broader than with the titanium catalyst. It could also b e seen that with the same comonomer content 1-tetradecene gave lower d ensity of the copolymers than 1-octene. However, no difference were se en between the densities of the copolymers obtained with 1-tetradecene and 1-octadecene. The melting temperature of the copolymers was seen to be the lower the longer the comonomer was. In the area of the high branching amount the linear correlation was not in work. It was also s hown that the differences in the heat of fusions could only be seen at high amount of branches (> 15 branches/1000C): the longer the comonom er the lower amount of heat was needed to melt the copolymer.