Synergistic Strengthening and Toughening of PS/LDPE Blends with Nano-CaCO3
Polystyrene(PS)/Low density Polyethylene(LDPE) blends were prepared in a twin-roll mill. Effects of the addition of nano-CaCO3, LDPE-g-MA, and the mixing procedure on the morphology, crystallization behavior, rheological and mechanical properties of the blends were investigated by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), Advanced Rheometric Expansion System (ARES) and mechanical testing. The results show that the addition of nano-CaCO3 reduces the droplet size and the crystallinity of LDPE dispersed phase, hence increases both the tensile and impact strength of the blends. The two-step mixing procedure in which LDPE and nano-CaCO3 were premixed prior to mixing with PS, facilitates forming encapsuled morphology, leading to a lower viscosity and a higher tensile strength of the blends.
Jinglong Bu, Pengcheng Wang, Liqun Ai, Xiaoming Sang, Yungang Li
W. H. Luo et al., "Synergistic Strengthening and Toughening of PS/LDPE Blends with Nano-CaCO3", Advanced Materials Research, Vols. 287-290, pp. 1574-1577, 2011