Synthesis and properties of novel styrene acrylonitrile/polypropylene blends with enhanced toughness

Abstract

BackgroundAlthough polypropylene (PP) has been widely used, its brittleness restricts even further applications.MethodsIn this study, we have used a melt blending process to synthesize styrene acrylonitrile (SAN)/PP blends containing 0, 5, 10, 15 and 20 wt% SAN. The effects of adding various amount of SAN on the blends characteristics, mechanical properties, thermal behavior and morphology were investigated.ResultsThe results demonstrated that SAN had no obviously effect on crystal form but reduced the crystallinity of PP and increased the viscosity. The heat deflection temperature and Vicat softening temperature were enhanced for all SAN/PP blends, in particular for blends with low SAN content (5 and 10 wt%). The morphology of SAN/PP blends with 10 wt% SAN revealed the presence of nanoparticles dispersed on the surface, while SAN/PP blends with 20 wt% SAN exhibited the presence of spherical droplets and dark holes. All SAN/PP blends showed higher impact strength compared to pure PP, especially for SAN/PP blend containing 10 wt% SAN for which the impact strength was 2.3 times higher than that of pure PP.ConclusionsThe reason for significant increase in impact properties seemed to have a strong correlation with nanoparticles morphology and the decrease of PP crystallinity.

Electrochemical Comparison of SAN/PANI/FLG and ZnO/GO Coated Cast Iron Subject to Corrosive Environments

“…As shown in Table 5, SAN/PANI/FLG had higher pore resistance (R pore ) than ZnO/GO coating indicating better electrochemical stability and corrosion resistance of the polymeric nanocomposite in seawater environment as compared to ceramic base nanocomposite system. The higher value of pore resistance can be attributed to reduced formation of pores in the coating, restricting the ability of the electrolyte to reach the metal’s surface, thereby decreasing the corrosion [15,16,17,18,19,20]; pore resistance parameters are also important for defining the chemical stability of coating in corrosive environment.…”

“…An electrochemical framework of Gamry ® Instruments was used to evaluate the performances of coating systems against corrosion to protect ductile cast iron pipeline in seawater and crude oil produced water. Electrochemical Impedance Spectroscopy (EIS) technique employs a short perturbation AC signals during electrochemical investigation [15,16,17,18,19,20]. Amplitude of 10 mV AC was applied to investigate the response of system under various frequencies.…”

Sustainable strategies towards better utilization of synthetic polymers

“…ABS polymers are composed of a binary phase system in which polybutadiene (PB) rubbery particles form the dispersed phase that is grafted on the styrene–acrylonitrile (SAN) copolymer, which is the continuous phase. [ 25–27 ] The composition of the three monomers is in the ratio below, with each monomer rendering specific properties to the polymer. Acrylonitrile (15%–35%), provides chemical resistance and heat stability, butadiene (5%–30%), provides toughness and impact strength while styrene (40%–60%), provides rigidity and processability.…”

“…ABS polymers are composed of a binary phase system in which polybutadiene (PB) rubbery particles form the dispersed phase that is grafted on the styrene-acrylonitrile (SAN) copolymer, which is the continuous phase. [25][26][27] The composition of the three monomers is in the ratio below, with each monomer rendering specific properties to the polymer.…”

“…[14] Even small changes in the composition of one of these monomers can drastically affect the mechanical, thermal, and rheological behavior of ABS polymers. [26,[31][32][33][34] ABS polymers are the most demanded polymer materials because of their ease of processing, low cost, and good mechanical, chemical, and electrical properties. Despite all these, they have some disadvantages like poor solvent resistance and weathering resistance, low dielectric strength, suffering stress cracking, and so forth.…”