A parametric study on processing of scratch resistant hybrid sol-gel silica coatings on polycarbonate

Date

2014-04-01

Author

Yavas, Hakan
Selcuk, C. Duygu Ozturk
Ozhan, A. E. Sinan
Durucan, Caner

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

306
views

0
downloads

Scratch resistant silica-based hybrid coatings on polycarbonate substrates were formed by dip-coating of acid-catalyzed tetramethyl ortohosilicate (TMOS): diethylenetriamine (DETA): H2O:2-propanol sols. The sol formulation and dip-coating process parameters on microstructural and performance properties-here optical transmittance and scratch resistance-of the coatings were evaluated. The effect of water quantity, total aqueous component (H2O + 2-propanol) amount and relative proportion of TMOS: DETA on film formation behavior and on performance properties have been investigated in a systematic way. It was found that an effectively polymerized hybrid coating rich in silica content, as realized for high TMOS or abundant water containing sols, resulted in defective films with microcracking and adhesion problems. High 2-propanol content on the other hand led to incomplete film coverage. It was shown that 5 +/- 1 mu m-thick, scratch resistant and pristine coatings exhibiting a visible transmittance of 86-88% can be formed with a single deposition process using an optimized sol formulation of TMOS: DETA: H2O: 2-propanol of 30: 30: 20: 20 in wt.%. Meanwhile, the hardness of the PC has increased from an initial value of 13.9 +/- 2 to 70 +/- 25 (Vickers hardness, HV1) upon coating. A surface hardness approaching to 250 HV1 can be attained by for the thicker coatings (8 +/- 1 mu m) deposited at higher withdrawal speeds. However, such films suffered from non-uniform coverage and poor surface/optical quality. The transmittance values reduced by a factor of 20-30% for thicker coatings.

Subject Keywords

Dip-coating, Polycarbonate, Scratch resistant, Sol-gel, Hybrid coatings

URI

https://hdl.handle.net/11511/38550

Journal

THIN SOLID FILMS

DOI

https://doi.org/10.1016/j.tsf.2014.01.024

Collections

Department of Metallurgical and Materials Engineering, Article

Suggestions

OpenMETU
Core

A parametric comparative study of electrocoagulation and coagulation using ultrafine quartz suspensions Kilic, Mehtap Guelsuen; Hosten, Cetin; Demirci, Şahinde (2009-11-15) This paper attempts to compare electrocoagulation using aluminum anodes and stainless steel cathodes with conventional coagulation by aluminum sulfate dosing on aqueous suspensions of ultrafine quartz. Several key parameters affecting the efficiency of electrocoagulation and coagulation were investigated with laboratory scale experiments in search of optimal parameter values. Optimal values of the parameters were determined on the basis of the efficiency of turbidity removal from ultrafine quartz suspension...
The Combination of benzotriazole and n-functionalized 2,5-di(2-thienyl)-1h-pyrrole units to investigate the electrochromic properties of conjugated polymers Rende, Eda; Çırpan, Ali; Department of Chemistry (2013) Synthesis of new conducting polymers is desired since their electrochemical and optical properties enable them to be used as active layers in many device applications. Benzotriazole and nfunctionalized 2,5-di(2-thienyl)-1h-pyrrole (SNS Series) containing polymers showed very promising results as electrochromic materials. In order to observe the effect of the combination of these two units three new monomers 2-(6-(2,5-bis(5-methylthiophen-2-yl)-1H-pyrrol-1-yl)hexyl)-4,7-di(thiophen-2- yl)-2H-benzo[d][1,2,3]t...
A novel experimental and density functional theory study on palladium and nitrogen doped few layer graphene surface towards glucose adsorption and electrooxidation Caglar, Aykut; Duzenli, Derya; Önal, Işık; Tezsevin, Ilker; Sahin, Ozlem; Demir Kıvrak, Hilal (Elsevier BV, 2021-03-01) At present, few layer graphene (G) and nitrogen doped few layer graphene (N doped-G) are firstly coated on Cu foil via chemical vapor deposition (CVD) method and G and N doped-G coated Cu foil is transferred to the indium tin oxide (ITO) substrate surface to obtain electrodes. Pd metal is electrodeposited onto the N doped-G/ITO electrode (Pd-N doped-G/ITO). Pd-N doped-G/ITO electrode are characterized with advanced surface characterization methods such as Raman spectroscopy and SEM-EDX. Characterization res...
A Pilot Study of Joint Stability at the Zirconium or Titanium Abutment/Titanium Implant Interface Cavusoglu, Yeliz; AKÇA, KIVANÇ; Gürbüz, Rıza; ÇEHRELİ, MURAT CAVİT (2014-03-01) Purpose: To compare the interfaces of loaded and unloaded zirconium and titanium abutments with titanium implants using scanning electron microscopy (SEM). Materials and Methods: Zirconium and titanium abutments (n = 5 per group; four test and one control) were torque-tightened into titanium implants secured into metal blocks, and computer-aided design/computer-assisted manufacture-based zirconium oxide copings were fabricated and cemented to the abutments with temporary resin-based cement. Specimens of eac...
A parametric study on hydrothermal synthesis of zinc oxide nanowires with various zinc salts Akgün, Mehmet Can; Ünalan, Hüsnü Emrah; Department of Micro and Nanotechnology (2012) ZnO is a promising semiconducting material for manufacturing optoelectronic devices. Its most important properties are its wide and direct band gap and its high electron-hole binding energy. Synthesis of ZnO in bulk and thin film form has been investigated intensively over recent decades. Likewise, nanomaterials have been in the point of focus for their different properties compared to their bulk form. The vastly increased ratio of surface area to volume and change in electronic properties with great reduct...

Citation Formats

H. Yavas, C. D. O. Selcuk, A. E. S. Ozhan, and C. Durucan, “A parametric study on processing of scratch resistant hybrid sol-gel silica coatings on polycarbonate,” THIN SOLID FILMS, pp. 112–119, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38550.