2/4/2011
Epitaxial crystallization and oriented structure of linear low-density polyethylene/isotactic polypropylene blends obtained via dynamic packing injection molding
(225–231)Polymers for Advanced Technologies 22 #2 (2011)
Su et al of Sichuan University and Perkin University, China used dynamic packing injection molding, which introduced strong oscillatory shear on the gradually-cooled melt during the packing process.  As iPP was the dominant phase (its content was more than 50 wt%), our results indicated that it could be highly oriented in the blends. In such case, it was interesting to find that LLDPE epitaxially crystallized on the oriented iPP through a crystallographic matching between (100)LLDPE and (010)iPP, resulting in an inclination of LLDPE chains, about 50° to the iPP chain axis.  On the other hand, when iPP was the minor phase, iPP was less oriented and no epitaxial growth between iPP and LLDPE and the LLDPE remained oriented.  (RDC 2/4/2011)