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Effects of silver nanoparticle on rheological and other physical properties of syndiotactic polypropylene

K.H. Lee, D.W. Chae, Y.H. Cho, M.H. Chang and B.C. Kim
Hanyang University, KR

nanocomposite, rheology, silver nanoparticle, syndiotactic polypropylene

The effects of introducing silver nanoparticle on the rheological and other physical properties of syndiotactic PP were investigated. The sPP containing 5 wt% silver nanoparticle presented higher crystallization temperature (Tc) and heat of crystallization (_Hc) than pure sPP by 12.3 _ and 4.1 J/g, respectively. The introduction of silver nanoparticles more than 1 wt% increased dynamic viscosity. At the crystallization temperature of 90 _ under shear, the silver nanoparticle had little effect on the induction time. However, at 100 _ the induction time was decreased with increasing the loading level. DSC melting endotherms exhibited double melting behavior in the vicinity of 121 and 129 _ when crystallized at 90 _ under shear. On the contrary, the samples crystallized at 100 _ under shear gave a single melting peak at about 126 _. Tensile strength remained constant up to 0.1 wt% load of silver, after which it decreased with increasing the loading level. The modulus of the sPP composites was increased a little with increasing the loading level of silver nanoparticle. Elongation to break increased up to the loading level of 0.1 wt%, after which it decreased with further increase of loading level.

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