Study by transmission electron microscopy and electron diffraction of thin polyethylene films

Popescu-Pogrion, N.; Tirnovan, M.

doi:10.1016/s0040-6090(97)00521-x

Cited by 3 publications

(1 citation statement)

References 3 publications

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“…However, there are some reports on the polymer thin films prepared by the vacuum evaporation. [1][2][3][4][5] Polymer thin film such as polyethylene (PE) had been deposited by the vacuum evaporation from the 1970s and characterized it is crystallinity, chemical structure and molecular weight. 1,2) Pogrion and Tirnovan 4) analyzed structure of the PE thin films before and after irradiation with electron beams was analyzed with transmission electron microscopy and electron diffraction.…”

Section: Introductionmentioning

confidence: 99%

Optical characteristics of poly(tetrafluoroethylene) thin film prepared by a vacuum evaporation

Ohnishi

Kita

Tsuchiya

et al. 2016

Jpn. J. Appl. Phys.

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Poly(tetrafluoroethylene) (PTFE) thin films were deposited onto a glass slide substrate by a heat-resistance type vacuum evaporation apparatus due to changing the evaporation conditions. Transparency of the PTFE thin films prepared by the vacuum evaporation depended on the deposition conditions, i.e., temperatures of the basket, and distance between the evaporation source and substrate. To elucidate relationship between the molecular structure and transparency of the PTFE thin film prepared by the vacuum evaporation, chemical structures, crystallinity and thermophysical property were investigated. The chemical bonding state of the PTFE thin film prepared by the vacuum evaporation was almost the same as that of the pristine PTFE, however, the crystalinity was different. Although the pristine PTFE was crystal structure, the transparent evaporated thin film was estimated to be microcrystal structure. In addition, endothermic peaks in a differential scanning calorimeter (DSC) spectrum of the PTFE thin film were different from that of the pristine PTFE. These endothermic peaks of the PTFE thin film prepared by the vacuum evaporation shifted lower temperature compared to the pristine PTFE, which suggests that molecular weight of the PTFE thin film prepared by the vacuum evaporation decreased compared with that of the pristine PTFE.

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Section: Introductionmentioning

confidence: 99%

Optical characteristics of poly(tetrafluoroethylene) thin film prepared by a vacuum evaporation

Ohnishi

Kita

Tsuchiya

et al. 2016

Jpn. J. Appl. Phys.

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Electron microscopy of γ‐irradiated polyethylene

Bercia

Tirnovan

Bercia

et al. 2006

Surface & Interface Analysis

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In this paper, we have studied the structure and the phase transformations in thin films (obtained by evaporation from g-irradiated polyethylene bulks -ageing polymer) before and after laser irradiation. We made a comparison between the following samples: A -thin films obtained from g-irradiated polyethylene bulk and not subjected to laser irradiation; B -thin films obtained from g-irradiated polyethylene bulk and subjected to laser irradiation. We have revealed many modifications in the dielectric and structural properties of the thin films, depending on the dose, dose rate and the time of laser irradiation (in the case of samples B). The thickness of all deposited films was 90 nm. The samples (non-irradiated or irradiated) were analysed by optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), in combination with selected area electron diffraction (SAED). We have also presented the structure of non-aged and non-irradiated thin polyethylene films (control polyethylene film), in which we observed a particularly puzzling phase between an incipient spherulitic phase and a fine structure of the spherulitic phase (specifically for thin PE films structure). After g-and laser irradiations, we observed a strong modification of the structure. The spherulitic phase was transformed. We observed large, amorphous, transparent crystals containing many defects, carbon precipitates, the beginning of crystallisation revealed by electron diffraction, treeing and breakdown figures (usually after laser irradiation).

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Characterization of polyethylene-metal composite thin films deposited by evaporation

2005

Adhesion Aspects of Thin Films, Volume 2

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Study by transmission electron microscopy and electron diffraction of thin polyethylene films

Cited by 3 publications

References 3 publications

Optical characteristics of poly(tetrafluoroethylene) thin film prepared by a vacuum evaporation

Optical characteristics of poly(tetrafluoroethylene) thin film prepared by a vacuum evaporation

Electron microscopy of γ‐irradiated polyethylene

Characterization of polyethylene-metal composite thin films deposited by evaporation

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