Rheological, thermal and crystallisation properties of ethylene, propylene and α-olefin copolymers. II Thermal and crystallisation properties

A series of random ethylene, propylene/1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene copolymers, ethylene and propylene homopolymers were prepared and investigated. The thermal and crystallisation properties of copolymer samples with different co-unit content and molecular masses were determined and compared with the properties of homopolymers. The effects of the length of co-unit and the comonomer content were investigated. The thermodynamic melting point was determined by linear and non-linear methods. The melting points and crystallinity decrease with the length of co-unit and with the increase in comonomer content. The crystallisation kinetics was investigated with the Avrami equation.