Structure formation of random isotactic copolymers of propylene and 1-hexene or 1-octene at rapid cooling

► The kinetics of ordering processes in random propylene copolymers has been analyzed. ► Melt-crystallization and mesophase formation are slowed down in random copolymers. ► The rate of ordering depends on the type of 1-alkene co-units. ► Longer branches are more effective in hindering ordering than shorter branches.