Effects of functional groups on the thermal properties of modified polystyrene

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Optical absorbance measurements have been performed on the epoxy resin and the composites prepared by its modification with two different oxime derivatives (benzaldoxime and 2-furaldoxime) in the wavelength interval of 190-680 nm by unpolarized light. Using the experimental absorbance data, dielectric constant and refractive index dispersion have been determined by means of standard oscillator fit procedure. Moreover, based on the dispersion analysis, direct and indirect band gap energies of the samples have been calculated. It is found that direct band energy for epoxy is nearly 3.49 eV, while its value for the oxime derivatives has been increased up to the 4.15 eV. Another important result to be pointed out is that the absorbance for the 2-furaldoxime doped resin has been greatly increased in a respectively, narrow interval ($ 30 nm wide) in the UV region, while in the case for the benzaldoxime doped sample, a decreasing has been observed in the absorbance at the same region.

Section: Methodsmentioning

confidence: 99%

Optical properties of modified epoxy resin with various oxime derivatives in the UV‐VIS spectral region

Durmuş

Şafak

Akbaş

et al. 2010

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“…The concentration of the acetyl group, bound to the structure of PS, was calculated by titration of acetic acid with 0.1 N KOH, which occurred after the chemical modification reaction of PS with AA using BF 3 .O(C 2 H 5 ) 2 as catalyst 29 where, Δ V is the volume of 0.1 N KOH used for titration of acetic acid in 1 mL sample (mL), T KOH is the amount of KOH in 1 mL 0.1 N KOH solution (0.005208 g), 56.1 is the molecular weight of KOH (g).…”

Section: Methodsmentioning

confidence: 99%

“…PS modified by various modificators has more stability against thermal destruction than unmodified PS, depending on structure and amount of boound active polyfunctional groups to the aromatic ring. Polystyrenes with lower molecular weight are more resistant against thermal destruction 29…”

Section: Introductionmentioning

confidence: 99%

Effect of unsaturated keto‐groups on physico‐mechanical and thermal properties of modified polystyrene

Cerit

Ahmetli

Kurbanli

2011

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Polystyrene (PS), after polyolefins, is the most widespread polymer both in industry and daily life, successfully replacing some natural raw materials. In this study, as a serial of our previous study, modified polystyrene containing acetyl group (CH 3 CO-) was used as a raw material and condensation reaction was performed in basic medium with aliphatic saturated and unsaturated aldehydes. The structures of modified polystyrenes with unsaturated keto-groups were investigated by chemical and spectral (FTIR vs. 1 H NMR) analyses. The effect of the functional groups bound to the structure of the polymer on physicomechanical and thermal properties of modified polystyrene was investigated. As a result, condensation products of modified polystyrenes with crotonaldehyde and cinnamaldehyde had higher physicomechanical properties and were more stable against the thermal destruction at high temperatures.

“…To determine the percentage of the epoxy groups in BO/GMA oligomers, the epoxy group in the sample was cleaved with an excess of HCl and then the remaining HCl was back titrated with KOH (0.1 N ) 15…”

Section: Methodsmentioning

confidence: 99%

“…Thermal analysis (TA) has assumed an important role in the study of polymers. TA supplies important information for the evaluation and the development of flame retarded (FR) polymers via the profile of their thermal decomposition 15–18…”

Section: Introductionmentioning

confidence: 99%

Synthesis and study of the oligo(ether–ester)s based on butylene oxide

Ahmetli

Koçak

Soydal

2008

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Unsaturated oligo(ether-ester) was prepared by ring-opening polymerization of butylene oxide (BO) with glycidyl methacrylate (GMA) in the presence of cationic catalyst BF 3 O(C 2 H 5 ) 2 . The effects of mol ratio of the initial components, amount of catalyst, temperature, and reaction times on the copolymerization reaction were examined. Oligo(ether-ester) were achieved in highest yield of 82% after reaction times of 4 h at 08C. Synthesized copolymer was characterized using spectroscopic ( 1 H NMR and IR) and chemical analysis methods. The thermal degradation and softing points of oligo(ether-ester)-styrene composites were studied. It is shown that crosslinking of the unsaturated oligo(ether-ester) with styrene takes place through the use of thermostable materials.