Study of the effects of MeV Ions on PS and PES

1997 ◽  
Vol 504 ◽  
Author(s):  
A. L. Evelyn ◽  
D. Ila ◽  
R. L. Zimmerman ◽  
K. Bhat ◽  
D. B. Poker ◽  
...  
Keyword(s):  
Chemical Structure ◽  
Microprobe Analysis ◽  
Crosslinking Agent ◽  
Electronic Energy ◽  
Gas Analysis ◽  
Alpha Particles ◽  
Layered System ◽  
Nuclear Stopping ◽  
Raman Microprobe ◽  
Nuclear Effects

ABSTRACTThe electronic and nuclear stopping effects produced by MeV ion bombardment in polyethylene (PE) and polyvinylidene chloride (PVDC) have been previously studied and reported. We have subsequently selected two other insulators: polystyrene (PS) and polyethersulfone (PES) which contains sulfur as a crosslinking agent, and irradiated them with MeV alpha particles. The electronic and nuclear effects of the incident ions were separated by stacking thin films of the polymers. A layered system was selected such that the first layers experienced most of the effects of the electronic energy deposited and the last layers received most of the effects of the nuclear stopping. The changes in the chemical structure were measured by residual gas analysis (RGA), Raman microprobe analysis, RBS and FTIR. The post-irradiation characterization resolved the effects of the stopping powers on the PS and PES and the results were compared with those from PE and PVDC.

scholarly journals Ion Beam Modification of PVDC and Pe Polymers

1995 ◽  
Vol 396 ◽  
Author(s):  
A. L. Evelyn ◽  
D. Ila ◽  
J. Fisher ◽  
D. B. Poker
Keyword(s):  
Chemical Structure ◽  
Microprobe Analysis ◽  
Ion Beam ◽  
Electronic Energy ◽  
Alpha Particles ◽  
Stopping Power ◽  
Nuclear Stopping ◽  
Resistivity Measurements ◽  
Ion Beam Modification ◽  
Raman Microprobe

AbstractThe electronic and nuclear stopping effects produced by MeV ion bombardment in polyvinylidine chloride (PVDC) and polyethylene (PE) are separated by stacking thin films of the polymers. The resulting multi-layer laminates of each polymer were bombarded with 3.5 MeV alpha particles. The energy of the incident ions was selected, using TRIM, such that the first layers experienced most of the effects of the electronic energy deposited and the last layers received most of the effects of the nuclear stopping power. The changes in the conductance and the chemical structure of each layer were measured by direct resistivity measurements and Raman microprobe analysis.

Effects of MeV Ion Beam on Polymers

1996 ◽  
Vol 438 ◽  
Author(s):  
A. L. Evelyn ◽  
D. Ila ◽  
R. L. Zimmerman ◽  
K. Bhat ◽  
D. B. Poker ◽  
...  
Keyword(s):  
Chemical Structure ◽  
Microprobe Analysis ◽  
Ion Beam ◽  
Electrical Conductance ◽  
Electronic Energy ◽  
Alpha Particles ◽  
Layered System ◽  
Nuclear Stopping ◽  
Resistivity Measurements ◽  
Film Polymer

AbstractThe electronic (εe) and nuclear (εa) stopping effects produced by 3.5 MeV and 5.0 MeV ion bombardment in polyvinylidine chloride (PVDC), polyethylene (PE) and polyethylene sulfide were studied and compared. To separate these effects we chose two bombardment energies and a thin film polymer stacking technique developed in house. The resulting stacked layered system consisting of each polymer was bombarded with 3.5 MeV and 5.0 MeV alpha particles. The layered system was selected such that the first few layers experience most of the effects of the electronic energy deposited and the last layer receives the effects of the nuclear stopping. The electrical conductance and the changes in the chemical structure were measured by direct resistivity measurements, Raman microprobe analysis, RBS, and FTIR. The post-irradiation characterization resolved the effects of the stopping powers on the polymer films.

Raman microprobe analysis of gaseous inclusion in diagenetically recrystallized calcites

1984 ◽  
Vol 107 (2) ◽  
pp. 193-202 ◽  
Author(s):  
Nicole Guilhaumou ◽  
Bruce Velde ◽  
Claire Beny
Keyword(s):  
Microprobe Analysis ◽  
Gaseous Inclusion ◽  
Raman Microprobe

scholarly journals Synthesis of Novel Crosslinked Chitosans with a Higher Fatty Diacid Diglycidyl and Their Adsorption Abilities towards Acid Dyes

2003 ◽  
Vol 21 (5) ◽  
pp. 439-449 ◽  
Author(s):  
Yoshiaki Shimizu ◽  
Atsushi Taga ◽  
Hitoshi Yamaoka
Keyword(s):  
Chemical Structure ◽  
Crosslinking Agent ◽  
Considerable Extent ◽  
Degree Of Substitution ◽  
Acid Orange 7 ◽  
Acid Dyes ◽  
Ph Values ◽  
Crosslinked Chitosan ◽  
Adsorbent Materials ◽  
Dye Molecule

Novel chitosan-based adsorbent materials with a higher fatty diacid diglycidyl as the crosslinking agent were synthesized and the adsorption abilities of the resulting polymers evaluated towards typical acid dyes. The successful formation of a crosslinked structure was confirmed via infrared spectroscopic measurements and the solubility of the polymer towards 10% aqueous solutions of acetic and formic acids determined. At higher dye concentrations, the adsorption abilities of the crosslinked chitosan towards hydrophilic CI Acid Orange 7 and CI Acid Red 1 increased with decreasing degree of substitution. However, at lower dye concentrations, the crosslinked chitosan with the lowest degree of substitution exhibited the lowest adsorption capability. With such hydrophilic acid dyes, the extent of adsorption decreased significantly as the pH of the solution increased. On the other hand, CI Acid Red 138, which contains a dodecyl group in the chemical structure, was adsorbed to a considerable extent even at higher pH values, suggesting hydrophobic interaction between the alkyl group in the dye molecule and the hydrophobic crosslinker.

Raman microprobe analysis of GaAs wafers

1990 ◽  
Vol 103 (1-4) ◽  
pp. 54-60 ◽  
Author(s):  
J. Jimenez ◽  
M.A. González ◽  
B. Martín ◽  
B. Calvo
Keyword(s):  
Microprobe Analysis ◽  
Raman Microprobe

Raman Microprobe Analysis of Laser-Induced Microstructures

1985 ◽  
Vol 51 ◽  
Author(s):  
P. M. Fauchet
Keyword(s):  
Spatial Resolution ◽  
Microprobe Analysis ◽  
Pulsed Laser ◽  
Amorphous Films ◽  
Periodic Surface ◽  
Laser Illumination ◽  
Explosive Crystallization ◽  
Raman Microprobe ◽  
Similarities And Differences

ABSTRACTWe study the composition, stress and structure variations across periodic surface undulations produced by pulsed laser illumination of semiconductors, by explosive crystallization of amorphous films, and by laser-assisted CVD. These variations are mapped out with a one micron spatial resolution using a Raman microprobe. Similarities and differences between the three cases are pointed out. These results are also compared to those obtained by deliberately exposing the sample to interfering beams.

Raman microprobe analysis of preforms and optical fibers

1984 ◽  
Vol 23 (23) ◽  
pp. 4197 ◽  
Author(s):  
W. Carvalho ◽  
P. Dumas ◽  
M. Delhaye ◽  
J. Corset ◽  
Y. Levy ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Microprobe Analysis ◽  
Raman Microprobe

Raman microprobe analysis of tungsten silicide

1985 ◽  
Vol 46 (11) ◽  
pp. 1076-1078 ◽  
Author(s):  
Peter J. Codella ◽  
Fran Adar ◽  
Yung S. Liu
Keyword(s):  
Microprobe Analysis ◽  
Tungsten Silicide ◽  
Raman Microprobe

scholarly journals Synthesis and swelling behavior of polyurethane networks based on hyperbranched polymer

2011 ◽  
Vol 65 (6) ◽  
pp. 637-644 ◽  
Author(s):  
Jasna Dzunuzovic ◽  
Marija Pergal ◽  
Slobodan Jovanovic ◽  
Vesna Vodnik
Keyword(s):  
Ethylene Oxide ◽  
Hyperbranched Polymer ◽  
Chemical Structure ◽  
Crosslinking Agent ◽  
Swelling Behavior ◽  
Hydroxyl Groups ◽  
Hyperbranched Polyester ◽  
Polyurethane Networks ◽  
Methylenediphenyl Diisocyanate ◽  
Step Polymerization

A series of six polyurethane (PU) networks was synthesized from BoltornR hydroxy-functional hyperbranched polyester (HBP) of the second pseudo generation as a crosslinking agent, ?,?- dihydroxy-(ethylene oxide-poly(dimethylsiloxane)-ethylene oxide) (EO-PDMS-EO) and 4,4?- methylenediphenyl diisocyanate, by a two-step polymerization in solution. Each sample of the prepared PUs had different EO-PDMS-EO content. The chemical structure of the synthesized networks was analyzed by FTIR spectroscopy. The influence of the EO-PDMS-EO content and type of the solvent on the swelling behavior of the PUs in 2-propanol and toluene was investigated. During the swelling measurements certain amount of sol fractions was extracted from the PUs by solvents. According to the 1H NMR results, sol fractions are mainly composed of the soluble hyperbranched PU, formed during the polymerization by partial modification of the end hydroxyl groups of HBP with NCO-terminated prepolymer synthesized in the first step of the reaction. Chains of the so reacted prepolymer can then fold back and form cyclic products by reaction of the free -NCO group from the NCO-terminated prepolymer with free -OH group of HBP. As the EO-PDMS-EO content increases the amount of the sol fractions and swelling degree also increased, indicating that networks with lower EO-PDMS-EO content are more crosslinked and have higher solvent resistance.

Raman microprobe analysis of Tl-Ca-Ba-Cu-O polycrystals

1988 ◽  
Vol 68 (1) ◽  
pp. 77-80 ◽  
Author(s):  
K.F. McCarty ◽  
D.S. Ginley ◽  
D.R. Boehme ◽  
R.J. Baughman ◽  
B. Morosin
Keyword(s):  
Microprobe Analysis ◽  
Raman Microprobe
Sign in / Sign up

Export Citation Format

Share Document