Mutual diffusion in the miscible polymer blend polystyrene/poly(xylenyl ether)

Composto, Russell J.; Krämer, Edward J.; White, Donald R.

doi:10.1021/ma00186a046

Cited by 133 publications

(134 citation statements)

References 11 publications

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“…15 Even so, homogeneity of the blends was checked by DSC. Thermograms measured for each blend used in this work show a single glasstransition process.…”

Section: Methodsmentioning

confidence: 99%

Calculation of polymer blend compositions from Raman spectra: A new method based on parameter estimation techniques

Tomba

Puente

Pastor

2000

J. Polym. Sci. B Polym. Phys.

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“…15 Even so, homogeneity of the blends was checked by DSC. Thermograms measured for each blend used in this work show a single glasstransition process.…”

Section: Methodsmentioning

confidence: 99%

Calculation of polymer blend compositions from Raman spectra: A new method based on parameter estimation techniques

Tomba

Puente

Pastor

2000

J. Polym. Sci. B Polym. Phys.

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“…The dynamic shear modulus was usually measured from 20 Hz down to as low as 1 x iO-' Hz. the broad range of experimental frequencies obviated time-temperature superpositioning (which is usually not valid for blends [22][23][24][25][26][27] nor even for some neat polymers [28,29]). Prior to measurements at any given temperature, samples were maintained for a time period exceeding the anticipated relaxation time, in order to minimize errors due to physical aging, an absence of which was affirmed by the reproducibility of measurements repeated after various time periods.…”

Section: Methodsmentioning

confidence: 99%

Dielectric and mechanical relaxation in PMPS, BMC and their mixtures

Santangelo

Roland

Ngai

et al. 1994

Journal of Non-Crystalline Solids

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Dielectric and dynamical mechanical measurements have been performed on mixtures of the small molecule glassforming liquid 1,1-bis(p-methoxyphenyl) cyclohexane (BMC) with poly(methylphenylsiloxane) (PMPS). Earlier measurements had indicated that the BMC dynamics are modified in a very interesting way by the presence of the polymer, despite the equivalence of their glass transition temperatures, Tg. By varying the molecular weight of the polymer (and hence Tg), the BMC mobility is anomalously enhanced in mixtures of high Tg PMPS. An interpretation for these results based on the coupling model of relaxation is suggested.

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“…Although there can be several contributions to the concentration dependence of D [5,25], the dominant one is surely the large difference between the Tg of PS (-105 ~ on one side of the couple and that of PXE (216~ on the other. As shown in Fig.…”

Section: Diffusionmentioning

confidence: 99%

Mutual diffusion studies of polystyrene and poly(xylenyl ether) using Rutherford backscattering spectrometry

Composto

Krämer

1991

J Mater Sci

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The concentration versus depth profile in diffusion couples initially consisting of layers of pure polystyrene (PS) and poly(xylenyl ether) (PXE) were measured. To reveal the profile, the PXE molecules (after diffusion) were preferentially stained in the glass by exposing the couple to a solution of 2 mol% Br in methanol; the covalently bound Br nuclei serve as heavy nuclear tags which permit a sensitive determination of the PXE depth profile by Rutherford backscattering spectrometry (RBS). The samples were annealed at temperatures, 7-, ranging from 1 77-21 0 ~ that are above the glass transition temperature, Tg, of the pure PS (105~ but below the Tg of pure PXE (21 6 ~ The measured concentration versus depth profile is markedly asymmetric, with a low slope at low values of the volume fraction of PXE, 4)PXE, but with a much greater slope at high values of qbpx E. These results are in qualitative agreement with the variation in the mutual diffusion coefficient, D, expected as qbpx E increases, causing the Tg of the blend to increase towards, and finally exceed, the diffusion temperature. Values of D extracted from these concentration versus depth profiles at low values of 4)PxE using the Boltzmann-Matano analysis are in good agreement with those measured by forward recoil spectrometry (FRES) in deuterated-PS: PXE couples with only small composition differences.

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Mutual diffusion in the miscible polymer blend polystyrene/poly(xylenyl ether)

Cited by 133 publications

References 11 publications

Calculation of polymer blend compositions from Raman spectra: A new method based on parameter estimation techniques

Calculation of polymer blend compositions from Raman spectra: A new method based on parameter estimation techniques

Dielectric and mechanical relaxation in PMPS, BMC and their mixtures

Mutual diffusion studies of polystyrene and poly(xylenyl ether) using Rutherford backscattering spectrometry

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