J. Polym. Sci. B Polym. Phys.
 1998
DOI: 10.1002/(sici)1099-0488(19980430)36:6<1013::aid-polb10>3.0.co;2-9
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Effect of sub-Tg relaxations on chromophore reorientation in corona-poled polymers

Shane C. Brower
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L. Michael Hayden
2
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Cited by 19 publications

(10 citation statements)
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“…Note that the amount of water adsorbed in room-stored PMMA is typically around 0.6% of the dried material and a lowering of T g by approximately 1 deg per 0.1% of weight increase due to hydration is expected. 51 Moreover, irrespective of the plasticizing influence of the chromophores 36,39,40 to the micro-Brownian motion of the chain segments, the downshift of T R is not expected to exceed 40 K. For example, differential scanning calorimetry (DSC) studies in several dye + PMMA blends give ∆T g e (7 K for perylene (R 1 ) R 2 ) H), 39 -17 K for 3-(1,1-dicyanothenyl)-1-phenyl-4,5-dihydro-1H-pyrazole, 52 ≈-25 K for N,N-dimethyl-p-nitroaniline, 41 and e-34 K for 4-[ethyl-(2-hydroxyethyl)amino]-4′-nitroazobenzene. 40 In view of the above considerations, the R signal is anticipated outside the investigated temperature range, in line with the spectra shown in Figure 2.…”
Section: Resultsmentioning
confidence: 99%
“…On the other hand, if we consider the flexibility of the matrix as an inconsequential factor for the optical response of Rh 6G, and by virtue of the observed strong modifications of the β relaxation dynamics in Rh 6G + PMMA, it is reasonable to consider the occurrence of strong dyehost interactions as the origin of the deterioration in the optical response of this blend. Such interactions may produce the strong coupling between the side groups rotation and the rotations of the chromophores [41][42][43] and adversely change optical characteristics of the dye molecule. The strong red shift of the emission optical bands of Rh 6G in PMMA, compared to the bands in matrices of moderate (porous SiO 2 , polycom glass) or high polarity (MeOH, EtOH), is a characteristic example (Figure 14).…”
Section: Effects Of the Polar And Ionicmentioning
confidence: 99%
See 1 more Smart Citation
Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.
“…Note that the amount of water adsorbed in room-stored PMMA is typically around 0.6% of the dried material and a lowering of T g by approximately 1 deg per 0.1% of weight increase due to hydration is expected. 51 Moreover, irrespective of the plasticizing influence of the chromophores 36,39,40 to the micro-Brownian motion of the chain segments, the downshift of T R is not expected to exceed 40 K. For example, differential scanning calorimetry (DSC) studies in several dye + PMMA blends give ∆T g e (7 K for perylene (R 1 ) R 2 ) H), 39 -17 K for 3-(1,1-dicyanothenyl)-1-phenyl-4,5-dihydro-1H-pyrazole, 52 ≈-25 K for N,N-dimethyl-p-nitroaniline, 41 and e-34 K for 4-[ethyl-(2-hydroxyethyl)amino]-4′-nitroazobenzene. 40 In view of the above considerations, the R signal is anticipated outside the investigated temperature range, in line with the spectra shown in Figure 2.…”
Section: Resultsmentioning
confidence: 99%
“…On the other hand, if we consider the flexibility of the matrix as an inconsequential factor for the optical response of Rh 6G, and by virtue of the observed strong modifications of the β relaxation dynamics in Rh 6G + PMMA, it is reasonable to consider the occurrence of strong dyehost interactions as the origin of the deterioration in the optical response of this blend. Such interactions may produce the strong coupling between the side groups rotation and the rotations of the chromophores [41][42][43] and adversely change optical characteristics of the dye molecule. The strong red shift of the emission optical bands of Rh 6G in PMMA, compared to the bands in matrices of moderate (porous SiO 2 , polycom glass) or high polarity (MeOH, EtOH), is a characteristic example (Figure 14).…”
Section: Effects Of the Polar And Ionicmentioning
confidence: 99%
Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.
“…The introduction of the chromophores brings to light a variety of new intermolecular interactions. In a recent report, Brower and Hayden studied the effect of sub- T g relaxations in the reorientation of several types of dye molecules in a series of corona-poled polymer hosts (PMMA, poly(ethyl methacrylate), and poly(isobutyl methacrylate)). Their experiments recorded a decrease in the activation volume for chromophore reorientation with increasing size of the polymer's alkyl side group.…”
Section: Resultsmentioning
confidence: 99%
Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.
“…SHG measurements employed a Nd:YAG laser (Continuum Minilite; 6 ns pulse duration; 25 mJ/pulse; 10 Hz) with a 1064 nm fundamental beam. The detailed experimental setup is described elsewhere 2 Temporal stability of the second-order optical susceptibility in AC2729. …”
Section: Methodsmentioning
confidence: 99%
Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.
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