Polymerization of organic compounds in an electrodeless glow discharge. VI. Acetylene with unusual comonomers

Yasuda, H.; Marsh, Henry C.; Bumgarner, M. O.; Morosoff, N.

doi:10.1002/app.1975.070191020

Cited by 51 publications

(20 citation statements)

References 5 publications

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“…The details of analysis of IR spectra can be seen in ref. 6. The addition of carbon monoxide to the acetylene plasma apparently results in carbonyls in the polymer, but in no appreciable decrease in the free-radical The addition of water, nitrogen, or carbon monoxide (or various combinations of these comonomers) to a glow-discharge polymerization of acetylene produces chemically distinct polymers.…”

Section: Resultsmentioning

confidence: 97%

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Preparation of composite reverse osmosis membranes by plasma polymerization of organic compounds. III. Plasma polymers of acetylene/CO/H₂O

Yasuda

Marsh

1975

J of Applied Polymer Sci

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SynopsisReverse osmosis characteristics of composite membranes prepared by the plasma polymerization of acetylene/CO/HzO mixtures with various ratios of components are investigated; porous film of cellulose nitrate-cellulose acetate is used as the substrate. This monomer system seems to have the following advantages: (1) A relatively short deposition time (1-2 min) is enough to produce reasonably good reverse osmosis membranes; and (2) good chemical stability of membranes can be obtained, especially in the case of chlorine resistance. INTRODUCTIONAs previously reported in the early parts of this series of studies, nearly all reverse osmosis membranes prepared by plasma polymerization which give reasonable reverse osmosis characteristics are nitrogen-containing polymers.' This is also the case with the results of other investigators. Buck and Davar2 report that the best results are obtained with the plasma polymer of vinylenecarbonate-acrylonitrile and those obtained with vinylacetate-acrylonitrile are second best. They also note that not many monomers yield water-permeable membranes by plasma polymerization. The work done by Hollahan and Wydeven3 and also by Bell, Wydeven, and Johnson4 has been mainly with the plasma polymer of allylamine.On the other hand, reverse osmosis membranes made of nitrogen-containing polymer, e.g., polyamide and aromatic polyamide, etc., seem to have the crucial weakness in chlorine resistance. Chlorine in the order of 10 ppm seems to virtually destroy otherwise excellent reverse osmosis characteristics of some membranes of this category. The weak chlorine resistance seems to negate the practicd values of these membranes for the production of potable water, since the addition of chlorine is the most feasible practice to keep water potable.Bell, Wydeven, and Johnson4 report that composite reverse osmosis membranes prepared by plasma polymerization of allylamine have rather poor chemical stability and that their reverse osmosis characteristics deteriorate with time, particularly at elevated temperatures. This group of investigators did not examine chlorine resistance.

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Section: Resultsmentioning

confidence: 97%

“…The details of these measurements can be seen in ref. 6. Figure 1 plots carbon monoxide incorporation as a function of gas phase composition.…”

Section: Resultsmentioning

confidence: 99%

Preparation of composite reverse osmosis membranes by plasma polymerization of organic compounds. III. Plasma polymers of acetylene/CO/H₂O

Yasuda

Marsh

1975

J of Applied Polymer Sci

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“…It is known that, immediately after deposition, a high concentration of free radicals is typically present in polymer films synthesized by PECVD 22. As the films are exposed to air, oxygen is chemically incorporated into the film as a result of reactions between these free radicals and the ambient oxygen and water vapor 22–24. In the irradiated films, the free radicals are also formed by the breaking of chemical bonds induced by the energetic He ions.…”

Section: Resultsmentioning

confidence: 99%

Helium Ion Irradiation of Polymer Films Deposited from TMS‐Ar Plasmas

Gelamo

Durrant

Trasferetti

et al. 2007

Plasma Processes & Polymers

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Polymer films synthesized from plasmas of a tetramethylsilane ‐ Ar mixture were modified by irradiation with 170 keV He ions at fluences ranging from 1 × 1014 to 1 × 1016 cm−2. As revealed by infrared spectroscopy, the ion beam produced intense bond rearrangements, such as the depletion of bonding groups (CH and SiH), and induced the formation of new ones, such as OH and SiO. From the nanoindentation measurements, a remarkable increase in the surface hardness of the films was observed as the ion fluence was increased. The increases in hardness were accompanied by an increase in the film compaction as shown by using a combination of RBS and film thickness measurements. From both hardness and infrared measurements it was concluded that, under the He ion bombardment, the polymer structure is transformed into a silicon oxycarbide network.

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“…[23][24][25][26] Plasma copolymerization is a unique technique for the formation of atypical thin films by combining features of two (or more) original monomers, thereby enabling new properties which can not be achieved by conventional synthesis methods. [27][28][29][30][31][32] We have previously reported on the fabrication of plasma-copolymerized (PcoP) photonic films from benzene and octafluorocyclobutane (OFCB) monomers. [33] The refractive index (n) of these PcoP films could be controlled by adjusting the monomer feed ratio and feed location.…”

Section: Introductionmentioning

confidence: 99%

PECVD Siloxane and Fluorine‐Based Copolymer Thin Films

Jiang¹,

Eyink²,

Grant³

et al. 2008

Chemical Vapor Deposition

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Plasma copolymerization is utilized to fabricate thin photonic films based on hexamethyldisiloxane (HMDSO, C 6 H 18 Si 2 O) and octafluorocyclobutane (OFCB, C 4 F 8 ). The structure of the plasma copolymerized films is examined by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR), and the optical properties including refractive index, n, and extinction coefficient, k, are determined by spectroscopic ellipsometry. The refractive indices, which range from 1.38 to 1.54, can be manipulated by adjusting the volume ratio of the two monomers, HMDSO and OFCB, during the polymerization. A nonlinear relationship between the refractive index and extinction coefficient with comonomer feed ratio is observed. A strong initial increase in both n and k as the amount of HMDSO is increased is attributed to significant defluorination of the resultant polymer films coupled with the formation of a C-C rich crosslinked network. Once the network incorporates substantial amounts of Si-C and Si-O bonds, the refractive index starts to decrease slowly due to a lowering of the density. XPS and FTIR results confirm the changes in internal structure consistent with this mechanism.

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Polymerization of organic compounds in an electrodeless glow discharge. VI. Acetylene with unusual comonomers

Cited by 51 publications

References 5 publications

Preparation of composite reverse osmosis membranes by plasma polymerization of organic compounds. III. Plasma polymers of acetylene/CO/H₂O

Preparation of composite reverse osmosis membranes by plasma polymerization of organic compounds. III. Plasma polymers of acetylene/CO/H₂O

Helium Ion Irradiation of Polymer Films Deposited from TMS‐Ar Plasmas

PECVD Siloxane and Fluorine‐Based Copolymer Thin Films

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Polymerization of organic compounds in an electrodeless glow discharge. VI. Acetylene with unusual comonomers

Cited by 51 publications

References 5 publications

Preparation of composite reverse osmosis membranes by plasma polymerization of organic compounds. III. Plasma polymers of acetylene/CO/H2O

Preparation of composite reverse osmosis membranes by plasma polymerization of organic compounds. III. Plasma polymers of acetylene/CO/H2O

Helium Ion Irradiation of Polymer Films Deposited from TMS‐Ar Plasmas

PECVD Siloxane and Fluorine‐Based Copolymer Thin Films

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Preparation of composite reverse osmosis membranes by plasma polymerization of organic compounds. III. Plasma polymers of acetylene/CO/H₂O

Preparation of composite reverse osmosis membranes by plasma polymerization of organic compounds. III. Plasma polymers of acetylene/CO/H₂O