Sytnhesis and characterization of nano zinc borate and its usage as a flame retardant for polymers

Baltacı, Berk
The objectives of this study are to synthesize sub-micron sized zinc borate and to use them with other flame retardant additives in poly(ethylene terephthalate) (PET) based composites. The study can be divided into two parts. In the first part, it was aimed to synthesize sub-micron sized zinc borate (2ZnO.3B2O3.3.5H2O) with the reaction of zinc oxide and boric acid. For this purpose, low molecular weight additives or surfactants were used in the syntheses to prevent the agglomeration and to decrease particle size. Effect of type of surfactant and its concentration; effect of using nano-sized zinc oxide as reactant on the synthesis, properties and morphology of 2ZnO.3B2O3.3.5H2O were investigated. Synthesized zinc borates were characterized by X-Ray diffraction (XRD), Scanning Electron Microscope (SEM) and Thermogravimetric Analysis (TGA). The results were compared with a commercial zinc borate, Firebrake (FB). Characterization results showed that at least in one dimension sub-micron size was obtained and synthesized zinc borates did not lose their hydration water until the process temperature of the composites. In the second part of the study, PET based composites, which mainly included synthesized sub-micron sized zinc borates were prepared by using a co-rotating twin screw extruder and injection molding machine. Synergist materials such as boron phosphate (BP) and triphenyl phosphate (TPP) were also used in the composite preparation. The composites were characterized in terms of flammability and mechanical properties. Flammability of composites was determined by using a Limiting Oxygen Index (LOI) test. Mechanical properties such as tensile strength, elastic modulus, elongation at break and impact strength were also studied. According to LOI and impact tests, the composites containing 3 wt. % BP and 2 wt. % zinc borate which was modified with poly(styrene-co-maleic anhydride), 2PSMA05/3BP and 2PSMA1/3BP have higher LOI and impact values when compared to neat PET.


Self reinforcement of poly(ethylene terephthalate) and polyyethyklene blends
Kurtuluş, Ceren; Bayram, Göknur; Department of Chemical Engineering (2007)
In this study, 20/80 (weight %) Poly(ethylene terephthalate) (PET) /High Density Polyethylene (HDPE) Microfibrillar Reinforced Composites (MFC) were prepared by using high density polyethylene (HDPE) as the matrix material, poly(ethylene terephthalate) (PET) as the reinforcing component. Ethylene n-butyl acrylate-glycidyl methacrylate (E-nBA-GMA) and ethylene methyl acrylate (E-MA) as the compatibilizers in 1, 5, and 10 wt. %. The objective of this study is to produce MFCs based on PET and HDPE via extrusio...
Zinc borate production in a batch reactor
Gürhan, Deniz; Eroğlu, İnci; Department of Chemical Engineering (2005)
Zinc borate is a flame retardant additive used in polymers, wood applications and textile products. There are different types of zinc borate having different chemical composition and structure. In this study, the production of zinc borate that had the molecular formula of 2ZnO.3B2O3.3,5H2O was studied. The aim of this study was to investigate the effects of reaction parameters on the properties of zinc borate that had been synthesized by the reaction of boric acid and zinc oxide at the existence of the seed...
YAPICI, Kerim; Osturk, Ozge; Uludağ, Yusuf (FapUNIFESP (SciELO), 2018-04-01)
Impact of the nanoparticle size and concentration on the rheology of ethylene glycol based nanofluids containing nanoparticles of five different metal oxides is investigated. Particle mass concentrations ranged from 5 to 20 wt %. Types of the nanoparticles and their particle size are TiO2 (30 nm, 50 nm), MgO (20 nm, 40 nm), ZnO (10-30 nm, 35-45 nm, 80-200 nm), SiO2 (20-30 nm, 60-70 nm) and CuO (40 nm, 80 nm). A stress controlled rheometer fitted with a cone-and-plate system is employed for the rheological c...
Bioprocess development for therapeutical protein production
Çelik Akdur, Eda; Çalık, Pınar; Department of Chemical Engineering (2008)
In this study, it was aimed to develop a bioprocess using the Pichia pastoris expression system as an alternative to the mammalian system used in industry, for production of the therapeutically important glycoprotein, erythropoietin, and to form stoichiometric and kinetic models. Firstly, the human EPO gene, fused with a polyhistidine-tag and factor-Xa protease target site, in which cleavage produces the native termini of EPO, was integrated to AOX1 locus of P. pastoris. The Mut+ strain having the highest r...
Diesel Oil Degradation Potential of a Bacterium Inhabiting Petroleum Hydrocarbon Contaminated Surface Waters and Characterization of Its Emulsification Ability
Onur, Gozde; Yılmaz, Fadime; İçgen, Bülent (Wiley, 2015-07-01)
Degradation of poorly water soluble hydrocarbons, like n-alkanes and polycyclic aromatic hydrocarbons are challenged by some bacteria through emulsification of hydrocarbons by producing biosurfactants. In diesel oil bioremediation, diesel oil degrading and surfactant producing bacteria are used to eliminate these pollutants from contaminated waters. Therefore, identifying and characterizing bacteria capable of producing surfactant and degrading diesel oil are pivotal. In this study, bacteria isolated from h...
Citation Formats
B. Baltacı, “Sytnhesis and characterization of nano zinc borate and its usage as a flame retardant for polymers,” M.S. - Master of Science, Middle East Technical University, 2010.