Mechanical properties of nanocomposites based on polypropylene-linear low density polyethylene-titanium dioxide nano particles by response surface methodology

Sajjad Daneshpayeh, Faramarz Ashenai Ghasemi^*, Ismail Ghasemi

Tabriz Journal of Mechanical Engineering, Volume 46, Issue 4, 2017(1), Pages 93-101. (ISC)

Abstract

In this study, mechanical and thermal properties of nanocomposites based on polypropylene/ linear low density polyethylene/ nano titanium dioxide (PP/LLDPE/TiO₂) were studied. Experiments were designed according to Box-Behnken response surface methodology (RSM) to screen out significant factors from linear low density polyethylene (LLDPE), styrene-ethylene-butylene-styrene (SEBS) and titanium dioxide nanoparticles (TiO₂). The samples were produced using a co-rotating  twin screw extruder including 0,2,4 Wt.% of nano particles, 20,40,60 Wt.% of LLDPE and 0,3,6 Wt.%  styrene-ethylene-butylene-styrene(SEBS) as compatibilizer.  Tensile properties (modulus, tensile strength and elongation at break) and impact resistance were evaluated. The results showed that modulus was increased by 7% with addition of nano particles in comparison to PP/LLDPE. In addition, impact resistance was increased by 5% and tensile strength and elongation at break were decreased.Some models also presented using the response surface for predicting the mechanical properties.

Key Words

Mechanical properties; Polypropylene; Low linear density polyethylene; Titanium dioxide nanoparticles; Response surface methodology.

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