Oriented nanometer surface morphologies by thermal relaxation of locally cross-linked and stretched polymer samples

Karade, Yogesh; Graf, Karlheinz; Brünger, W.; Dietzel, Andreas; Berger, Rüdiger

doi:10.1016/j.mee.2007.01.128

Cited by 5 publications

(4 citation statements)

References 20 publications

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“…After the rinsing the unpaired spins (free radicals), observed in the EPR spectra, may initiate a cross-linking in the polymer surface layer. This process has actually been observed in a couple of previous papers [29,30].…”

Section: Ablation Of Polymers By Plasma Treatmentsupporting

confidence: 69%

Comparison of glow argon plasma-induced surface changes of thermoplastic polymers

Řezníčková

Kolská

Hnatowicz

et al. 2011

Nuclear Instruments and Methods in Physics Research Section B:

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Section: Ablation Of Polymers By Plasma Treatmentsupporting

confidence: 69%

Comparison of glow argon plasma-induced surface changes of thermoplastic polymers

Řezníčková

Kolská

Hnatowicz

et al. 2011

Nuclear Instruments and Methods in Physics Research Section B:

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“…A further decrease of the layer thickness and the ripple distance without changing the type of ion can be realized, if the polymer is covered with a gold layer prior to ion exposure, 49 which must be removed chemically before annealing.…”

Section: Resultsmentioning

confidence: 99%

“…However, a change of the type of ion leads to different thickness and cross-link densities of the modified polymer layers at the same time. A further decrease of the layer thickness and the ripple distance without changing the type of ion can be realized, if the polymer is covered with a gold layer prior to ion exposure, which must be removed chemically before annealing.…”

Section: Resultsmentioning

confidence: 99%

Determination of Cross-Link Density in Ion-Irradiated Polystyrene Surfaces from Rippling

et al. 2009

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The irradiation of polymer surfaces with ion beams leads to pronounced chemical and physical modifications when the ions are scattered at the atoms in the polymer chain. In this way, different products of decomposition occur. Here we show that by changing the ion fluence and the mass of the ion the local mechanical properties as Young's modulus of a polystyrene surface layer can be tailored. By annealing prestretched irradiated PS near the glass transition, surface rippling occurs in the irradiated areas only, which can be described with an elastic model. The moduli obtained from rippling periodicities and elastic model assumptions are in the range between 8 and 800 MPa at the glass transition and characterize the irradiated PS as rubberlike. From these values the network density and the molar mass of entanglement are quantified. The obtained network density equals the density of hydrogen vacancies generated through the scattered ions, as confirmed by simulations of the atomic scattering and displacement processes. The obtained molar mass of entanglement reveals that the PS locally was densely cross-linked. Our results show that even for nondiscrete layered polymer systems relevant polymer parameters can be derived from the well-known surface rippling without the need for costly chemical analysis.

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“…Microstructuring of polymer films are usually prepared by phase inversion [1], extrusion-stretching [2], drop evaporation [3] and so on. These techniques have been developed based mainly on the properties of the raw polymeric materials used and perhaps on the targeted applications such as gas separation [4], tissue engineering [5],etc.…”

Section: Introductionmentioning

confidence: 99%

Microstructuring of Polystyrene Films by Template-Leaching Technique

Meng

2012

AMR

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In this study, porous polystyrene membranes were prepared by a template-leaching technique. A suspension was first prepared by dispersing both polystyrene and starch in toluene, in which starch was used as leachable component. The weight ratio of starch/polystyrene ranged from 1:1, 1:2 to 1:3, whereas the concentration of the suspensions altered from 1%, 3%, to 5% by weight of polystyrene/toluene. After spin-coating the prepared suspension on the glass substrate, polystyrene/starch thin-film was produced, and then was treated with inorganic acid to remove starch components. The porous films with ordered and homogeneous structures were resulted. Analysis by contact angle measurement, scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy analysis (FTIR) show that the microstructures on the porous films were affected by many experimental factors during the formation of thin-film and the following leaching process. Especially the type of the inorganic acid such as HCl, H2SO4, or HNO3, and the concentration of the specific acid selected in the leaching process have dramatic influences on the formation of the porous polystyrene membrane. The results further demonstrated that starch particles can be maximally removed when the films were immersed into the aqueous solution of HNO3.

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Oriented nanometer surface morphologies by thermal relaxation of locally cross-linked and stretched polymer samples

Cited by 5 publications

References 20 publications

Comparison of glow argon plasma-induced surface changes of thermoplastic polymers

Comparison of glow argon plasma-induced surface changes of thermoplastic polymers

Determination of Cross-Link Density in Ion-Irradiated Polystyrene Surfaces from Rippling

Microstructuring of Polystyrene Films by Template-Leaching Technique

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