Insulintherapie

Sauer, Heinrich

doi:10.1007/978-3-642-66379-6_17

Cited by 9 publications

(10 citation statements)

References 120 publications

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“…(nq, H) ) 1 1 + n 2 q 2 a -2 H 4 ∼ H -4 (21) because alternate anticonformal/conformal configurations with respect to the grating are present. The minus sign in front of the first case indicates that this layer is anticonformal (the Fourier components are negative compared to those of the grating!).…”

Section: Roughness Propagation In Copolymer Filmsmentioning

confidence: 97%

“…The P2VP and PS layers are drawn as shaded and clear, respectively. Strong hydrogen bonding with silanol groups always assures that the P2VP layer is present at the grating interface, while the lower surface energy of PS 21 requires a PS layer at the vacuum interface. Figure 6b shows the conformation of block copolymer layers in the conformal configuration, while Figure 6c shows the configuration of the same block copolymer on a higher grating where the ordering becomes nonconformal to the grating interface.…”

Section: Conformality Of Smectic Copolymer Filmsmentioning

confidence: 99%

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Confinement of Block Copolymers on Patterned Surfaces

Li¹,

Qu²,

Rafailovich³

et al. 1997

Macromolecules

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Smectic ordered films of the copolymer PS-P2VP were studied on periodic silicon surfaces (surface gratings). The modulation of the film surface with respect to that of the underlying substrate was found to be either in phase (conformal) orssurprisinglysout of phase (anticonformal). The critical height of the surface grating which is defined by the transition from conformal behavior to the anticonformal conformation of the films was found to be proportional to the lamellar height of the diblock copolymers. This has been quantitatively understood within a mean field theory as a result of balancing the deformation and interfacial energies. Furthermore, diblock copolymer films propagate the substrate roughness by significantly larger distances than observed for amorphous homopolymers.

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Section: Roughness Propagation In Copolymer Filmsmentioning

confidence: 97%

Section: Conformality Of Smectic Copolymer Filmsmentioning

confidence: 99%

Confinement of Block Copolymers on Patterned Surfaces

Li¹,

Qu²,

Rafailovich³

et al. 1997

Macromolecules

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“…[6][7][8][9] This high sensitivity to the cooperative relaxations is an experimental conse-been used in all of our previous work, and the resulting activation energies obtained as de-quence of the polarization and depolarization sequences used. 16 Although much effort has been scribed below, are remarkably insensitive to small differences in the exact details of polarization se-devoted to verifying the accuracy of the activated parameters determined by TSC-TS with other quence.…”

Section: Introductionmentioning

confidence: 99%

Cooperative motions in PVC studied by thermally stimulated currents: Comparison with A.C. dielectric derivative analysis

Nogales

Sauer

1998

J. Polym. Sci. B Polym. Phys.

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The thermally stimulated current–thermal sampling (TSC–TS) technique was used to study the broadened glass transition in conventional “atactic” poly(vinyl chloride), PVC. The activated parameters obtained from the TSC–TS data, mainly the apparent activation energy (Ea), characterize the breadth of glass transitions in a very sensitive way. These results are compared with those values of Ea obtained from the literature, using a recently proposed method of analyzing a.c. dielectric constants and their derivatives, over the temperature range of −100–130°C. Both techniques detect weak cooperative glass transition‐like relaxations well below the main glass transition of ca. 80°C. As is the case with “atactic” PMMA, the data suggest that compositional heterogeneity related to a small fraction of predominantly isotactic sequences contribute to the broad glass transition extending ca. 60°C below the main glass transition in atactic PVC. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 913–918, 1998

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“…11,26 This high sensitivity to the high activation energy relaxing species is related mainly to the polarization and depolarization sequences used, and the method used for extracting E a from the TSC-TS peaks, and will be discussed more quantitatively in a future report. 27 In this report we characterize the broad glass transition regions of PMMA of different tacticities in terms of the magnitude of the values of E a . Comparison of the values of E a with semiempirical predictions allows us to evaluate the breadth of the glass transition over a wide range of temperatures.…”

Section: Introductionmentioning

confidence: 99%

Structural Heterogeneity in Poly(methyl methacrylate) Glasses of Different Tacticity Studied by Thermally Stimulated Current Thermal Sampling Techniques

Sauer

Kim

1997

Macromolecules

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The thermally stimulated current thermal sampling (TSC-TS) technique was used to study the cooperative glass transition like relaxations in different tacticity poly(methyl methacrylates) (PMMAs) including iso-and syndiotactic forms. We use the high sensitivity of the TSC-TS method to study these weak and sometimes overlapping relaxations at a frequency of about 10 -3 Hz where one can resolve cooperative relaxations well below the main glass transition (Tg), even if the species are a minor fraction of the overall relaxing species. The magnitudes of the values of Ea are compared with a theoretical prediction as a function of temperature, showing that the low-temperature tail of the glass transition in conventional atactic (e.g., 45% syndiotriads) extends down to 15 °C, while in our highest syndiocontent PMMA (80% syndiotriads), the glass-transition-like relaxations only extend down to about 80 °C. Results taken from the literature also substantiate the results obtained here for atactic PMMA. The results are contrasted to those for bisphenol-A polycarbonate and other polymers and suggest that compositional heterogeneity, more specifically the presence of low Tg "pockets" of predominantly isotactic sequences, contributes to the broad glass transition extending almost 90 °C below the main glass transition in atactic PMMA.

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Insulintherapie

Cited by 9 publications

References 120 publications

Confinement of Block Copolymers on Patterned Surfaces

Confinement of Block Copolymers on Patterned Surfaces

Cooperative motions in PVC studied by thermally stimulated currents: Comparison with A.C. dielectric derivative analysis

Structural Heterogeneity in Poly(methyl methacrylate) Glasses of Different Tacticity Studied by Thermally Stimulated Current Thermal Sampling Techniques

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