Plasma-Polymerized Organosilicones and Organometallics

Wróbel, A. M.

doi:10.1016/b978-0-12-200430-8.50009-9

Cited by 80 publications

(56 citation statements)

References 202 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dispersive energy slightly increases over short treatment times and decreases at longer times. Some studies consider that this component is an indication of the crosslinking degree of plasma-polymers (24,25) . In this sense, treatments shorter than 30 min enhance crosslinking, whereas longer treatments induce bond scission, which is probably the reason why the polar component is diminished due to functional groups emission.…”

Section: Resultsmentioning

confidence: 99%

Acetylene plasma-polymer films treated by argon plasma immersion ion implantation

Santos¹,

Mota

Honda

et al. 2016

RBAV

View full text Add to dashboard Cite

Structural and surface properties of acetylene plasma polymer films were studied as a function of treatment time via Plasma Immersion Ion Implantation (PIII). The polymer films were obtained from acetylene and argon mixture using radiofrequency glow discharge and then treated by argon PIII. XPS (X-ray photoelectron spectroscopy) was used to analyze the composition of the films before and after PIII treatment. With rising exposure time, XPS revealed an increase of oxygen-to-carbon (O/C) atomic ratio from 0.23 to 2.43. It can be explained by recombination processes between dangling bonds or radicals created in the polymer structure and atmospheric water and/or oxygen. It was observed that the film structure is predominantly formed C-H and C-C bonds, and there was an increment of the C=O proportion bonds upon argon PIII treatment. The wettability of the polymer films was investigated using contact angle measurements for water and diodimethane droplets on the film surface. After the argon ion implantation, the contact angle was reduced from 55 to 24 degrees, attributed to incorporation of polar groups in the polymer structure. Upon aging in atmosphere, all samples lost the high wettability, but the hydrophilic character of the films was maintained. It was used atomic force microscopy (AFM) to investigate the roughness of the samples. After argon PIII treatment, the roughness of the polymer films decreased from 8.1 to 5.5 nm, mainly due to ablation processes like sputtering one. The hardness and elastic modulus of the polymer films were investigated by nanoindentation technique. The hardness was enhanced from 0.68 to 5.35 GPa and the elastic modulus increased from 28 to 97 GPa. In general, the results show that argon PIII turned acetylene plasma polymer films smoother and mechanically more resistant, but its effect depends on treatment time.Keywords: Acetylene; Ion implantation; XPS; Wettability; Hardness. ReSumoAs propriedades estruturais e superficiais de filmes de acetileno polimerizados a plasma foram estudados como função do tempo de tratamento por Implantação Iônica por Imersão em Plasma (IIIP). Os filmes poliméricos foram obtidos a partir de uma mistura dos gases argônio e acetileno em descargas excitadas por radiofrequência, e então tratados por IIIP em atmosfera de argônio. A espectroscopia fotoeletrônica de raios-X (XPS) foi usada para analisar a composição dos filmes antes e após os tratamentos. Esta análise revelou que o aumento do tempo do tratamento, induziu o aumento da proporção atômica oxigênio-carbono (O/C) de 0,23 para 2,43. Isto é explicado pelos processos de recombinação entre as ligações pendentes, ou radicais criados na estrutura polimérica, e a água ou oxigênio do ar atmosférico. Observou-se também que a estrutura dos filmes é predominantemente formada por ligações C-C e C-H, e que ligações C=O aumentam após o tratamento por IIIP. A molhabilidade dos filmes foi avaliada usando medidas de ângulo de contato entre gotas de água, e diometano, e a superfície dos filmes. Após a implantação d...

show abstract

Section: Resultsmentioning

confidence: 99%

Acetylene plasma-polymer films treated by argon plasma immersion ion implantation

Santos¹,

Mota

Honda

et al. 2016

RBAV

View full text Add to dashboard Cite

show abstract

“…19 The dominant characteristic of fragmentation for this type of monomers is the abstraction of methyl groups, whereas the inorganic part of the monomer molecules does not undergo significant fragmentation in the deposition process. GC/MS (gas chromatography/mass spectrometry) and IR (infrared spectroscopy) data showed that the original structure units in the monomers are incorporated into plasma polymers.…”

Section: Structure Of Cat Plasma Polymersmentioning

confidence: 99%

“…GC/MS (gas chromatography/mass spectrometry) and IR (infrared spectroscopy) data showed that the original structure units in the monomers are incorporated into plasma polymers. 19 The chemical structures of plasma polymers prepared by CAT from siloxane monomers were studied by FTIR spectroscopy, and the transmission spectra were shown in Figures 4 and 5…”

Section: Structure Of Cat Plasma Polymersmentioning

confidence: 99%

“…This indicated the increase of monomer structure retention with monomer feed rate, due to the fact that the plasma polymerization of siloxanes occurs mainly through the abstraction of methyl groups. 19 …”

mentioning

confidence: 97%

“…It should be noted that all the siloxane plasma polymers are characterized by a strong absorption in 1100 -1000 cm Ϫ1 region due to SiOOOSi asymmetric stretching. 19,20 The CAT POLYMERIZATION broadband close to 2140 cm Ϫ1 is interpreted as SiOH stretching, which is a new band not present in HMDSO, VpMDSO, or TVTMTSO monomers. The absorption peak at 910 -900 cm Ϫ1 corresponding to SiOH deformation was clearly observed in TMDSO and TMTSO plasma polymers and could also be seen as a shoulder in HMDSO, VpMDSO, and TMTVTSO polymers.…”

mentioning

confidence: 99%

See 2 more Smart Citations