Contribution of nanoclays to the flame retardancy of polyethylene-based cable insulation materials with aluminum hydroxide and zinc borate

Date

2014-03-01

Author

Kaynak, Cevdet

Metadata

Show full item record

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

Item Usage Stats

378
views

0
downloads

The main aim of this study was to investigate contribution of nanoclays to the flame retardancy of two cable insulation materials: low-density polyethylene and its blend with ethylene vinyl acetate. For this purpose, nanoclays were first incorporated alone, then together with traditional flame-retardant aluminum hydroxide, and then together with aluminum hydroxide-zinc borate system. Compounds and nanocomposites were prepared by melt mixing method with a twin-screw extruder, while specimens were shaped by compression and injection molding. X-ray diffraction analysis and transmission electron microscopy revealed that nanoclay silicate layers were mainly intercalated with certain level of exfoliation in both matrices. Limiting oxygen index, UL-94 vertical burning, and mass loss cone calorimeter analyses indicated that for both matrix materials even use of nanoclays alone could improve many flammability parameters including peak heat release rate, time to ignition, and fire growth index. Contributions of nanoclays were much more significant when they were incorporated together with traditional aluminum hydroxide or together with aluminum hydroxide-zinc borate system. Residue analysis revealed that contribution of nanoclays to the flame retardancy mechanisms of aluminum hydroxide and zinc borate was mainly by formation of strong and tough char structure via well-dispersed and intercalated/exfoliated silicate layers shielding the underlying polymer matrices from heat and mass transfer.

Subject Keywords

Mechanical Engineering, Mechanics of Materials, Safety, Risk, Reliability and Quality

URI

https://hdl.handle.net/11511/37358

Journal

JOURNAL OF FIRE SCIENCES

DOI

https://doi.org/10.1177/0734904113500129

Collections

Department of Metallurgical and Materials Engineering, Article

Suggestions

OpenMETU
Core

Effects of nanoclays on the flammability of polystyrene with triphenyl phosphate-based flame retardants Kaynak, Cevdet (SAGE Publications, 2013-07-01) The main purpose of this study is to investigate the effects of nanoclays on the flammability behavior of neat polystyrene and polystyrene compounded with traditional flame retardants triphenyl phosphate and its synergist melamine cyanurate. Nanocomposites were prepared via ultrasound-assisted solution intercalation technique. Dispersion and nanomorphology of nanoclays were investigated through X-ray diffraction analysis and transmission electron microscopy. Thermal stability and flammability behaviors were...
Halogen-free Flame Retardants that Outperform Halogenated Counterparts in Glass Fiber Reinforced Polyamides Isitman, Nihat Ali; GÜNDÜZ, Huseyin Ozgur; Kaynak, Cevdet (SAGE Publications, 2010-01-01) Flammability, fire performance, and thermal stability of short glass fiber reinforced polyamide-6 and polyamide-66 containing halogenated and halogen-free flame retardants (FRs) were compared. Flammabilities were assessed by limiting oxygen index tests and UL94 classifications. Fire behavior was evaluated by mass loss cone calorimetry, a bench-scale tool, to assess fire performance of materials. Halogen-free, phosphorus-based FRs were shown to perform superior to halogenated counterparts on the basis of imp...
Usability of three boron compounds for enhancement of flame retardancy in polyethylene-based cable insulation materials İBİBİKCAN, Esin; Kaynak, Cevdet (SAGE Publications, 2014-03-01) It is known that for the production of halogen-free cable insulation materials based on polyethylene, very high amounts of traditional metal hydroxide flame retardants such as 65 wt% aluminum hydroxide are required to fulfill international directives. In this respect, the aim of this study was to reveal possible enhancement effects of three boron compounds on the flame retardancy of two cable insulation materials: low-density polyethylene and its blend with ethylene vinyl acetate both loaded with aluminum h...
Effect of carbon fiber amount and length on flame retardant and mechanical properties of intumescent polypropylene composites ATABEK SAVAŞ, Lemiye; Mutlu, Aysenur; Dike, Ali Sinan; Tayfun, Umit; DOĞAN, Mehmet (SAGE Publications, 2018-02-01) The effects of carbon fiber amount and length were studied on the flame retardant, thermal, and mechanical properties of the intumescent polypropylene composites. The flame retardant properties of the intumescent polypropylene-based composites were investigated using limiting oxygen index, vertical burning test (UL-94), and mass loss calorimeter. The mechanical properties of the composites were studied using tensile test and dynamic mechanical analysis. According to the flammability tests results, the antag...
Contribution of carbon nanotubes to vibration damping behavior of epoxy and its carbon fiber composites Avil, Esma; Kadioglu, Ferhat; Kaynak, Cevdet (SAGE Publications, 2020-04-01) The main objective of this study was to investigate contribution of the non-functionalized multi-walled carbon nanotubes on the vibration damping behavior of first neat epoxy resin and then unidirectional and bidirectional continuous carbon fiber reinforced epoxy matrix composites. Epoxy/carbon nanotubes nanocomposites were produced by ultrasonic solution mixing method, while the continuous carbon fiber reinforced composite laminates were obtained via resin-infusion technique. Vibration analysis data of the...

Citation Formats

C. Kaynak, “Contribution of nanoclays to the flame retardancy of polyethylene-based cable insulation materials with aluminum hydroxide and zinc borate,” JOURNAL OF FIRE SCIENCES, pp. 121–144, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/37358.