Thermal characterization of composites of polyamide-6 and polypropylene involving boron compounds via direct pyrolysis mass spectrometry

Download

index.pdf

Date

2013

Author

İşbaşar Afacan, Güllü Ceyda

Metadata

Show full item record

Item Usage Stats

200
views

122
downloads

In this work, the effects of addition of boron compounds, boron phosphate (BPO4), zinc borate (ZnB), borosilicate (BSi) and lanthanum borate (LaB), on thermal degradation characteristics of composites of polyamide 6 (PA6) and polypropylene (PP) are analyzed via Direct Pyrolysis Mass Spectrometry (DP-MS) technique. The composites of PA6 involve nitrogen containing flame retardants, melamine (Me) or melamine cyanurate (MC); or phosphorus containing flame retardant, aluminum diethylphosphinate (AlPi), with or without organically modified clay. Composites of PP involve intumescent flame retardants (IFR) with or without maleic anhydride grafted polypropylene (PP-g-MA) and organically modified clay. The presence of Me or MC does not affect thermal stability of PA6, but due to the strong interactions between Me, MC or isocyanic acid and PA6, generation of new fragments occurs and loss of Me or MC is shifted to high temperatures. Presence of boron compounds results in significant changes in loss of Me and MC and thermal degradation products of the PA6. The presence of AlPi decreases thermal stability of PA6 noticeably. Addition of boron compounds or organically modified clay, improves the thermal stability of PA6/AlPi composite, most probably due to the weakening of the interactions between AlPi and PA6. Addition of boron containing compounds to PP involving IFR, improves the thermal stability of PP; yet, no significant differences in the thermal degradation pathways of PP are observed. Moreover, decrease in the relative intensities of PP based fragments with high mass and in those of both pentaerythritol (PER) and ammonium polyphosphate (APP) based fragments are recorded. Upon addition of Cloisite 15A, the thermal stability of PP is decreased. Inclusion of IFR to this composite improves the thermal stability. Inclusion of all boron compounds (especially ZnB) affects the thermal stability of the composite.

Subject Keywords

Polyamides., Polypropylene., Boron compounds., Pyrolysis., Mass spectrometry.

URI

http://etd.lib.metu.edu.tr/upload/12616477/index.pdf
https://hdl.handle.net/11511/22858

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Thermal degradation of Polylactide/Poly(ethylene glycol) fibers and composite fibers involving organoclay Ozdemir, Esra; Hacaloğlu, Jale (2018-01-01) In this study, electrospun fibers of melt blended poly(lactic acid) and poly(ethylene glycol), (PLA)-PEG blends involving 10, 15 and 20 wt% PEG and their corresponding composites with organically modified montmorillonite, Cloisite 30B were prepared and characterized by x-ray diffraction, differential scanning calorimetry, thermogravimetry and direct pyrolysis mass spectrometry techniques. The narrower fiber diameters observed for the PLA-PEG fibers involving organoclay compared to the corresponding neat fib...
Thermal decomposition of glycidyl azide polymer by direct insertion probe mass spectrometry Fazlioǧlu, Hatice; Hacaloğlu, Jale (2002-01-01) Thermal decomposition reactions and products of glycidyl azide polymer (GAP), have been investigated by direct insertion mass spectrometry and evolved gas analyses by FTIR spectroscopy techniques. It has been observed that thermal degradation of GAP begins with cleavage of the side groups. Although the main decomposition started with the elimination of molecular nitrogen from the azide functional group, degradation initiated by loss of N-3 and CH2N3, depolymerization type reactions were also identified. Rea...
Thermal degradation of polystyrene composites. Part I. The effect of brominated polyepoxy and antimony oxide Kaya, Hatice; Hacaloğlu, Jale (2014-01-01) Thermal degradation of polystyrene (PS) involving brominated polyepoxy (BA) and antimony oxide (PS/BE/Sb2O3) was studied systematically via direct pyrolysis mass spectrometry. Thermal decomposition of brominated polyepoxy was started by loss of end groups. The relative yields of high mass thermal degradation products of PS and the product distribution of brominated polyepoxy and antimony oxide were changed noticeably during the pyrolysis of PS/BE/Sb2O3 composite. Its thermal decomposition was initiated by t...
Thermal Degradation of Polylactide and Its Electrospun Fiber Ozdemir, Esra; Hacaloğlu, Jale (2016-01-01) Thermal degradations of poly(lactic acid), (PLA) and its fiber were studied via direct pyrolysis mass spectrometry. As the amount of PLA pyrolyzed was increased the relative yields of protonated and cyclic oligomers were increased indicating that inter-molecular interactions were promoted. Hydrolysis reactions caused significant decrease in the relative yields of high mass products. Intermolecular trans-esterifications were more effective during the pyrolysis of PLA fiber. On the other hand, PLA fiber showe...
Thermal degradation of polythiophene-natural rubber and polythiophene-synthetic rubber conducting polymer composites Hacaloğlu, Jale; Akbulut, Ural; Toppare, Levent Kamil (1997-01-01) Thermal degradation of conducting polymer composites of polythiophene and rubbers was studied by direct and indirect pyrolysis mass spectrometry techniques. The samples were prepared by electrooxidation of polythiophene using natural rubber or synthetic rubber as the insulating matrix. Presence of decomposition products which were not observed during pyrolysis of pure polythiophene and rubbers, and disappearance of rubber-based pyrolysis mass peaks, together with changes in thermal stability and behaviour, ...

Citation Formats

G. C. İşbaşar Afacan, “Thermal characterization of composites of polyamide-6 and polypropylene involving boron compounds via direct pyrolysis mass spectrometry,” Ph.D. - Doctoral Program, Middle East Technical University, 2013.