Regularly arranged superstructures on stretched high polymers

Kaempf, G.; Orth, H.

doi:10.1080/00222347508217858

Cited by 22 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nanofibril Formation by Dewetting. At its most basic level, the process of surface roughening occurs by the breaking of primary chemical bonds. ,− Exposure to plasma will induce both chain scission and reaction resulting in relatively polar LMWFs . We can consider the product of the etching process to be an unstable, nonwetting thin film of liquid on the PET substrate (Figure ).…”

Section: Discussionmentioning

confidence: 99%

“…19,[25][26][27][28] predominant reactive species in radio frequency (RF) plasmas are positive ions and photons capable of breaking primary chemical bonds to form reactive radicals. 25,27,29,30 These reactive radicals usually interact with the surrounding gas to produce new surface functionalities such as carbonyl, hydroxyl, or carboxylic acid groups created from radical-gas interactions. Both the chemical structure of the polymer and the type of plasma determine the extent and character of degradation.…”

Section: Introductionmentioning

confidence: 99%

“…Reactive plasmas contain charged particles (ions and electrons), excited neutrals, radicals, and UV radiation, ,, which can react with a polymeric surface to remove contamination, introduce chemical functionalities, and induce chain scission and cross-linking. ,− The predominant reactive species in radio frequency (RF) plasmas are positive ions and photons capable of breaking primary chemical bonds to form reactive radicals. ,,, These reactive radicals usually interact with the surrounding gas to produce new surface functionalities such as carbonyl, hydroxyl, or carboxylic acid groups created from radical−gas interactions. Both the chemical structure of the polymer and the type of plasma determine the extent and character of degradation .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nanofibrillar Surfaces via Reactive Ion Etching

Powell

Lannutti

2003

Langmuir

View full text Add to dashboard Cite

The reactive ion etching of poly(ethylene terephthalate) using various gas compositions was examined. A radio frequency power supply operating at 30 kHz was used to produce plasmas from the following gases and 50:50 gas mixtures: Ar, N2, O2, Ar-N2, Ar-O2, and N2-O2. Exposure times were typically 10, 20, and 30 min. The relatively inert gases and gas mixtures (Ar, N2, Ar-N2) produced a polygonal pattern of protrusions surrounding shallow cavities. In contrast, the presence of oxygen or oxygen-containing plasmas invariably imposed a fibrillar structure on these polygons in which "nanofibrils" typically originated at the triple points of several neighboring polygons. The dimensions of these fibrils varied with the exposure time but were up to 300 nm in length and approximately 20 nm in diameter. Atomic force microscopy was used to quantify the surface roughness and show that the inert gas compositions (Ar, N 2, Ar-N2) produced statistically indistinguishable values of Ra (14.1 ( 1.7, 15 ( 2.5, 14.2 ( 2.9 nm) significantly larger than those of the as-received film. The pure oxygen-etched films have Ra values approximately twice as large as those of the other gas compositions. Prior work by Nie et al. suggests that films consisting of etchingresistant, low-molecular-weight fragments can form under these conditions. We find that surface physics normally associated with thin polar films on apolar substrates adequately describes the origin of the observed nanofibrils. Prior surface deformation has an additional influence on fibril spacing and density.

show abstract