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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

Keywords:
nanocomposite, rheology, silver nanoparticle, syndiotactic polypropylene

Abstract:
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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