Fluorescence response from anthracene labeled polystyrene to study its thermal transitions

Turrión, S.G.; Olmos, D.; Ekizoglou, Nikos; González‐Benito, J.

doi:10.1016/j.polymer.2005.03.056

Cited by 16 publications

(19 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, from Equation (2), it can be seen that intrinsic fluorescence is mainly influenced by n, K nr and K RET . Based on this point, the changes in intrinsic fluorescence intensity of excimer and monomer should be interpreted in terms of the balance of these three factors: (i) the reduction of the refraction index [41]; (ii) the deactivation of the fluorescence by non-radiative processes due to the increased thermal motions, and (iii) the attenuated radiative energy transfer caused by the decreased the local concentration of chromophore during volume expansion [42]. The detailed mechanism will be mentioned in the next section.…”

Section: Methodsmentioning

confidence: 99%

Interfacial adhesion of nanoparticles in polymer blends by intrinsic fluorescence spectra

Yang¹,

He²,

Zhang³

et al. 2011

Express Polym. Lett.

View full text Add to dashboard Cite

Abstract.Intrinsic fluorescence was applied to quantitatively describe the interfacial adhesion of nanoparticles in polystyrene/poly(vinyl methyl ether) (PS/PVME) blends. Due to the aggregation of aromatic rings on PS chains, the temperature dependence of excimer fluorescence intensity (I 324 ) showed the high sensitivity to the phase separation process. Consistent with Ginzburg thermodynamic model, it was found that the addition of spherical hydrophilic nanoparticles shifted the phase separation temperature to higher temperatures due to the aggregation of silica into PVME chains leading to the free energy reduction and slowing down the phase separation dynamics. A certain composition of polymer blend, i.e. 2/8, was focused on to shed light on the dynamic of spinodal decomposition (SD) phase separation by using decomposition reaction model. It was shown that the addition of nanoparticles to polymer blends resulted in the deviation of linear relationship between the initial SD phase separation rate (R p0 ) and thermodynamic driving force (!f SD ). Besides, for PS/PVME (2/8) with 2 vol% silica nanoparticles, the apparent activation energy of phase separation (E a ) was 196.61 kJ/mol, which was higher than that of neat PS/PVME (2/8) blend (E a = 173.68 kJ/mol), which strongly confirmed the interfacial adhesion effect of silica nanoparticles as compatibilizers.

show abstract

Section: Methodsmentioning

confidence: 99%

Interfacial adhesion of nanoparticles in polymer blends by intrinsic fluorescence spectra

Yang¹,

He²,

Zhang³

et al. 2011

Express Polym. Lett.

View full text Add to dashboard Cite

show abstract

“…Usually, it is assumed that, the non-radiative processes (K nr ) almost become zero at very low temperatures, so that the radiative deactivation is the favored pathway and only K r accounts for the fluorescence intensity. However, at relatively high temperatures, the motions of the polymer chains are less limited and the balance of these two factors should be taken into account: (i) the reduction of the refraction index [30] and (ii) the deactivation of the fluorescence by non-radiative processes due to the increased thermal motions [31]. Note that, the refractive index of amorphous polymer film decreases with the temperature increases and shows a inflection point at Tg, suggesting stronger temperature dependence at T > T g than T < T g [30].…”

Section: Apparatusmentioning

confidence: 99%

Intrinsic fluorescence studies of compatibility in thermoplastic phenol formaldehyde resin / poly(ε-caprolactone) blends

Yang¹,

Liu²,

Zhang³

et al. 2011

Express Polym. Lett.

View full text Add to dashboard Cite

Abstract. Intrinsic fluorescence method was applied to study the miscibility and interactions of thermoplastic phenol formaldehyde resin (TPF) / poly(!-caprolactone) (PCL) blends. The characteristic intrinsic fluorescence emission of TPF at 313 nm showed the very good sensitivity to monitor the macromolecular chain motion in the TPF/PCL blends. The glass transition (T g ), crystallization (T c ), and melting transition point (T m ) of TPF/PCL blends were measured by the temperature dependence of intrinsic fluorescence intensities upon heating or cooling process. Interestingly, when TPF/PCL " 5/5, besides a T g for the amorphous phase of blend, another transition at temperature a little higher than T g of PCL can be observed by intrinsic fluorescence method. This microheterogeneity can be explained by the so-called 'rigid amorphous phase' (RAP) due to the good flexibility and the strong self-association of PCL chains in amorphous phase. Besides, the analysis of the dependence of T g on the content of PCL suggests that this microheterogeneity can attenuate the interactions between TPF and PCL chains and result in a lowering of T g s of blends. In view of the simplicity and sensitivity of measurement as well as affordability of instrument, intrinsic fluorescence proved to be an effective means for characterization of microstructural variation in polymer blends.

show abstract

“…[18] Surface-modified silica nanoparticles can be filled in acrylate-based resins to a larger load up to 50 wt.-%; in combination with the acrylate composition using bisphenol-A-diacrylate as a co-monomer, a refractive index tuning between 1.48 and 1.51 at 633 nm is possible. [21] The addition of small, electron-rich, organic dopants to polymers is often motivated by the dopant's fluorescence behaviour detecting high-energy radiation or polymermatrix phase transitions, [22] the realisation of waveguides with particular, non-linear optical properties, [23] or the refractive-index modification of methacrylates in the NIR-range. [18] Thin, transparent films (15 mm) of Ormosil systems comprised of electron-rich, organic moieties like phenyl groups can be synthesized by the sol-gel route.…”

Section: Full Papermentioning

confidence: 99%

Polymer/Phenanthrene‐Derivative Host‐Guest Systems: Rheological, Optical and Thermal Properties

Hanemann

Böhm

Honnef

et al. 2007

Macro Materials & Eng

View full text Add to dashboard Cite

Starting from commercially‐available, polymer‐based reactive resins like acrylates or unsaturated polyesters, a systematic investigation was carried out as to the influence organic dopants like phenanthrene and its derivatives have on the optical and thermal properties of the mixtures resulting from curing to the final thermoplastic polymer. The refractive index of PMMA at 633 nm can be increased, starting from 1.49 for the pure polymer, up to a value of around 1.55, and, in the case of the polyester, from 1.565 up to 1.6. The transmittance in the visible range is slightly affected at a lower dopant concentration of up to 10 wt.‐%, and remains better than 80% for a sample with a thickness of 1 mm, in the range between 500 and 800 nm. An unwanted side‐effect of larger dopant concentrations is to lower the glass transition temperature significantly.magnified image

show abstract

Fluorescence response from anthracene labeled polystyrene to study its thermal transitions

Cited by 16 publications

References 36 publications

Interfacial adhesion of nanoparticles in polymer blends by intrinsic fluorescence spectra

Interfacial adhesion of nanoparticles in polymer blends by intrinsic fluorescence spectra

Intrinsic fluorescence studies of compatibility in thermoplastic phenol formaldehyde resin / poly(ε-caprolactone) blends

Polymer/Phenanthrene‐Derivative Host‐Guest Systems: Rheological, Optical and Thermal Properties

Contact Info

Product

Resources

About