Glass transition induced by solvent desorption for statistical MMA/ n BMA copolymers — Influence of copolymer composition

Saby-Dubreuil, A.C.; Guerrier, B.; Allain, C.; Johannsmann, Diethelm

doi:10.1016/s0032-3861(00)00539-5

Cited by 32 publications

(28 citation statements)

References 24 publications

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“…where the Poisson ratio ν of PMMA is about 0.35 [31], and its elastic modulus E is typically 3 GPa [32]. Hence, for ε = 0.08, which is the maximum expected in spin-cast PMMA, σ is about 370 MPa.…”

Section: Stress Generation During the Shrinkage Of Pinned Filmsmentioning

confidence: 98%

Structural relaxation of spin-cast glassy polymer thin films as a possible factor in dewetting

et al. 2003

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Reiter [1] has recently reported a situation in which the dewetting of quasi-solid films is linked plastic deformation -rather than viscous flow -resulting from capillary forces. Herein we propose that, in thin films of some glassy polymers -especially poly(methyl methacrylate) (PMMA) -prepared by spin-casting from solvent, structural relaxation might impart sufficient stress to cause plastic deformation. We find that PMMA films decrease in thickness by several percent, which is sufficient to create significant stress in those cases in which the film is attached to a rigid substrate. The floating technique, which can take tens of minutes, might allow most of the structural relaxation to occur prior to dewetting experiments.

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Section: Stress Generation During the Shrinkage Of Pinned Filmsmentioning

confidence: 98%

Structural relaxation of spin-cast glassy polymer thin films as a possible factor in dewetting

et al. 2003

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“…The interaction of polymer thin‐films with solvent vapors has attracted a great deal of attention because of its broad range of applications in areas such as the drying of polymer and paint coatings,1–3 microlithography,4 biological sensors,5–7 polyimide protective coatings for microelectronic packaging,8 flexible hosing and seals,9 and chemically sensitive, selective polymer coatings for organic vapor determination 10–14…”

Section: Introductionmentioning

confidence: 99%

FGF‐2 signaling is sufficient to induce dermal condensations during feather development

Song

Lee

Goetinck

2004

Developmental Dynamics

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In a previous report, we showed that fibroblast growth factor-2 (FGF-2) is a signal produced by epidermal placode cells during feather development and that this growth factor can induce feathers in scaleless mutant skins that fail to form feathers due to a defective epidermis (Song et al., [1996] Proc Natl Acad Sci USA 93:10246 -10249). Here, we test whether FGF-2 is sufficient to induce dermal condensations, structures that normally form under the control of signals from the epidermal placode and are identified on the basis of aggregation of cells, the expression of FGF receptor-1 and bone morphogenetic protein-2 transcripts and the cessation of proliferation of the condensed cells. By using denuded 8-day scaleless dermis as a test system, we have established that FGF-2 is sufficient to induce dermal condensation. We suggest that the primary effect of FGF-2 is an increase in cellular density mediated through cell migration, followed by the expression of dermal condensation-specific genes and cessation of cell proliferation. The FGF-2 effect can be abolished by heparin, suggesting the involvement of heparan sulfate proteoglycans (HSPGs) in growth factor signaling. The spatiotemporal expression of syndecan-3 during feather development suggests that this cell-surface HSPG may be involved in the response of competent embryonic skin dermis to FGF-2. Developmental Dynamics 231:741-749, 2004.

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“…In absorption/desorption experiments of toluene in several methacrylate polymer films, Saby-Dubreuil et al [16] observed that some of the absorbed toluene remains trapped in the films even after extensive drying. The presence of solvent in films has also been detected through some changes in the film properties [17,18].…”

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confidence: 99%

Solvent retention in thin polymer films studied by gas chromatography

Garcia-Turiel

Jérôme

2007

Colloid Polym Sci

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Thin polystyrene films were produced by spin coating from solutions in toluene. The amount of solvent retained in the films after drying for different times was measured using gas chromatography. Whereas for thicker films (thickness > 200 nm), the relative amount of solvent in the films is less than a few percent, the proportion of toluene increases significantly in thinner films. The thickness dependence of the mass of retained solvent shows that the solvent is mainly retained at the polymer-substrate interface. The solvent desorption rate exhibits no variation on the film thickness.

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Glass transition induced by solvent desorption for statistical MMA/ n BMA copolymers — Influence of copolymer composition

Cited by 32 publications

References 24 publications

Structural relaxation of spin-cast glassy polymer thin films as a possible factor in dewetting

Structural relaxation of spin-cast glassy polymer thin films as a possible factor in dewetting

FGF‐2 signaling is sufficient to induce dermal condensations during feather development

Solvent retention in thin polymer films studied by gas chromatography

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