Polymer and Dye Probe Diffusion in Poly(methyl methacrylate) below the Glass Transition Studied by Forced Rayleigh Scattering

Вениаминов, А. В.; Sillescu, H.

doi:10.1021/ma981312d

Cited by 67 publications

(40 citation statements)

References 38 publications

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“…In 2005, Blaya et al [10], estimated D ~10 14 cm 2 /s. They and other authors noted that the matrix composition (PVA) [13,28,29] plays a very critical role in determining D. It is important to note that our PVA has a higher molecular weight than those reported by other authors; therefore, our D values may possibly be assumed to be a fast limit for acrylamide diffusion. However Blaya et …”

Section: Theoretical Surface Behaviormentioning

confidence: 65%

Surface relief model for photopolymers without cover plating

et al. 2011

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Relief surface changes provide interesting possibilities for storing diffractive optical elements on photopolymers and are an important source of information to characterize and understand the material behaviour. In this paper we present a 3-dimensional model based on direct measurements of parameters to predict the relief structures generated on the material. This model is successfully applied to different photopolymers with different values of monomer diffusion. The importance of monomer diffusion in depth is also discussed.

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Section: Theoretical Surface Behaviormentioning

confidence: 65%

Surface relief model for photopolymers without cover plating

et al. 2011

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“…The monomer diffusion coefficients are expected to decrease with increasing matrix polymer chain length, but no further decrease is anticipated above a certain chain length. [33,34] In the case of poly(St), the value of T g becomes independent of molecular weight above approximately 10 5 g Á mol À1 . [35] The initiator concentration dependence of k p observed at 70 8C was significantly stronger than that observed here.…”

Section: Propagation Rate Coefficientmentioning

confidence: 99%

High‐Temperature Propagation and Termination Kinetics of Styrene to High Conversion Investigated by Electron Paramagnetic Resonance Spectroscopy

Zetterlund

Yamauchi

Yamada

2004

Macro Chemistry & Physics

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Summary: The free radical bulk polymerization of styrene at 120 °C has been investigated over almost the entire conversion range using electron paramagnetic resonance spectroscopy, Fourier‐transform near‐infrared spectroscopy and gel permeation chromatography. The free radical concentration went through a sharp maximum that coincided with the peak in the rate of polymerization during the gel effect, and shifted to higher conversion with increasing initiator concentration. The termination rate coefficient (kt), decoupled from the initiator efficiency (f) by use of the instantaneous degree of polymerization, remained close to constant up to as high as approximately 80% conversion, at which a dramatic decrease occurred. Both the propagation rate coefficient (kp) and f fell orders of magnitude near 80% conversion in spite of the temperature being above the glass transition temperature of the system. The value of kp increased with the initiator concentration at a given conversion in the highest (diffusion‐controlled) conversion range.Termination rate coefficient (kt) versus conversion for bulk free radical polymerization of St initiated by TBP at 120 °C. [TBP] = 0.15 (○), 0.10 (▴) and 0.05 M ().magnified imageTermination rate coefficient (kt) versus conversion for bulk free radical polymerization of St initiated by TBP at 120 °C. [TBP] = 0.15 (○), 0.10 (▴) and 0.05 M ().

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“…In 2005, Blaya et al [23] reviewed the previous literature and estimated D AA ∼ 10 −14 cm 2 =s. They also noted that the experimental temperature, relative to the material glass transition temperature [24][25][26], and the matrix composition (molecular weight distribution) [27][28][29] [30]. This model differs significantly from that of the NPDD model.…”

Section: Introductionmentioning

confidence: 99%

Monomer diffusion rates in photopolymer material Part I Low spatial frequency holographic gratings

Gleeson

Sheridan

2011

J. Opt. Soc. Am. B

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For photopolymers, knowing the rate of diffusion of the active monomer is important when modeling the material evolution during recording in order to understand and optimize their performance. Unfortunately, a confusingly wide range of values have been reported in the literature. Re-examining these results, experiments are carried out for both coverplated (sealed) and uncoverplated material layers and the measurements are analyzed using appropriate models. In this way, a more detailed analysis of the diffraction processes taking place for large-period gratings is provided. These results, combined with those in Part II, provide unambiguous evidence that the monomer diffusion rate in a commonly used acrylamide polyvinyl alcohol-based material is of the order of 10 −10 cm 2 =s. This value closely agrees with the predictions of the nonlocal polymerization-driven diffusion model.

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Polymer and Dye Probe Diffusion in Poly(methyl methacrylate) below the Glass Transition Studied by Forced Rayleigh Scattering

Cited by 67 publications

References 38 publications

Surface relief model for photopolymers without cover plating

Surface relief model for photopolymers without cover plating

High‐Temperature Propagation and Termination Kinetics of Styrene to High Conversion Investigated by Electron Paramagnetic Resonance Spectroscopy

Monomer diffusion rates in photopolymer material Part I Low spatial frequency holographic gratings

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