Polyolefin Co-Crystal Alloys: Mobile and Fixed Crystals

Co-crystallization of most semicrystalline polymers, especially polyolefins consisting of hydrocarbons is challenging due to difficulty of parallel packing in the same crystal.  In this work, we report polymer co-crystallization of mobile and fixed polyolefin crystals using syndiotactic- (s) and atactic–(a) hydrogenated poly(norbornene) (hPNB)s, which are conformationally similar but dynamically dissimilar in the crystalline regions created by controlling stereoregularity in  hPNB. Interestingly, these novel polyolefin co-crystals vary crystallinity (Φ_c) of 50-80% , long period (L) of 22 - 80 nm and melting temperature (T_m) of 135 -145 °C by simply changing compositions.