Showing papers by "Hatsuo Ishida published in 1986"
TL;DR: In this article, the melting behavior of poly(aryl-ether-etherketone) was investigated using Fourier transform infra-red (FTir) spectroscopy and differential scanning calorimetry (d.s.c.) as part of a study of a carbon fibre reinforced PEEK composite.
99 citations
TL;DR: In this paper, the authors used FT-IR spectroscopy to characterize the chemical reactions at the silane/matrix resin interphase of a composite material and found that the reactions between the coupling agent and the epoxy resin were minimized when the interphase was most condensed and that the siloxane linkages are needed to improve the chemical resistance of the crosslinked interphase region of the composite to solvent attack.
92 citations
TL;DR: In this paper, the authors investigated the crystallization behavior via annealing of PEEK using FTIR spectroscopy and found that predominantly amorphous PEEK follows two distinct mechanisms when it is annealed.
Abstract: The crystallization behavior, via annealing, of PEEK was investigated using FTIR spectroscopy. It was found that predominantly amorphous PEEK (e.g., quenched polymer) follows two distinct mechanisms when it is annealed. One is a lower energy relaxation process that involves the partial rotation of the ether linkages, allowing the molecular chains in the disordered phase to become better packed, and occurs from 50 to 140°C (slightly below Tg). This relaxation process is also observed by dynamic mechanical analyses. The other process is a crystallization that takes place above the glass transition, with its onset characterized by the rotation of the benzophenone linkages near Tg. Isothermal crystallization kinetics data on PEEK can be described by an Avrami equation with an Avrami constant n of about 1.
49 citations
TL;DR: Anhydrocondensation intermoleculaire du [γ-(methacryloxy) propyl] trimethoxysilane hydrolyse a la surface d'oxyde de plomb as mentioned in this paper.
Abstract: Anhydrocondensation intermoleculaire du [γ-(methacryloxy) propyl] trimethoxysilane hydrolyse a la surface d'oxyde de plomb
42 citations
TL;DR: In this article, the authors used Diffuse reflectance Fourier transform infrared spectroscopy (DFTIR) to detect absorbed water hydrogen-bonded to Kevlar-49® fibers.
Abstract: Diffuse reflectance Fourier transform infrared spectroscopy has been used in order to detect absorbed water hydrogen-bonded to Kevlar-49® fibers. Varying amounts of KBr overlayers were used on the top of each sample in order to increase the surface selectivity of the technique. Three different O-H stretching vibrations of absorbed water were detected in the fibers exposed to saturated water-vapor atmosphere. Two peaks at 3640 and 3560 cm−1 are attributed to absorbed water that is weakly hydrogen-bonded to amide groups of the polymer. A broad absorption around 3450 cm−1 is characteristic of liquid-like water clustered in microvoids and other sites inside the fibers. The spectra of dried Kevlar-49® fibers show an unbonded amide N-H stretching peak at 3431 cm−1, indicative of regions with less perfect chain packing. At least part of these groups hydrogen-bond with absorbed water, depending on their availability.
36 citations
TL;DR: In this article, Fourier transform infra-red (FTi.r.) photoacoustic spectroscopy in combination with deuterium exchange was used to determine the accessibility of the NH groups of Kevlar 49 fibres.
36 citations
TL;DR: In this article, Fourier transform infrared reflection-absorption spectroscopy (FTIRRAS) is applied to the study of corrosion protection of copper by an organic coating.
Abstract: Fourier transform infrared reflection-absorption spectroscopy (FTIRRAS) is applied to the study of corrosion protection of copper by an organic coating. Poly-N-vinylimidazole (PVI(1)) and poly-4(5)-vinylimidazole (PVI(4)) are demonstrated to be effective new polymeric anticorrosion agents for copper at elevated temperatures. Oxidation of copper is suppressed even at 400° C. PVI(1) and PVI(4) are more effective anti-oxidants than the most commonly used corrosion inhibitors, benzotriazole and undecylimidazole, at elevated temperatures. These new polymeric agents are water soluble and easy to treat the metal surface with.
34 citations
23 citations
TL;DR: In this paper, Fourier transform infrared spectroscopy (FT-IR) was used to study chemical reactions in the epoxy-functional silane hydrolyzate bulk, and the kinetics of these reactions were studied, and relative reaction rates were obtained.
Abstract: Chemical reactions in the epoxy-functional silane hydrolyzate bulk have been studied by Fourier transform infrared spectroscopy (FT-IR). It was found that the silanol group opened the epoxy ring upon heating, concurrently with the silanol condensation. The kinetics of these reactions were studied, and the relative reaction rates were obtained.
21 citations
TL;DR: In this article, the phase retardation (delta) and relative amplitude (psi) were calculated from these measurements using ellipsometry, using a polyvinyl acetate (PVAc) film.
Abstract: Reflection spectra containing phase as well as intensity information were collected on a FT-IR spectrometer using two linear polarizers. The sample consisted of a poly(vinyl acetate) (PVAc) film on a copper substrate. Using well known principles of ellipsometry, the relative phase retardation (delta) and relative amplitude (psi) were calculated from these measurements.
21 citations
TL;DR: In this paper, the authors studied the thermal degradation of polyvinylimidazoles on copper and found that the degradation mechanism involved three stages, with the duration of each stage quite different between the two polymers.
Abstract: Oxidative thermal degradation of polyvinylimidazoles on copper have been studied. Degraded products include olefinic, saturated, and α,β-unsaturated ketones, α,β-unsaturated and β-iminonitriles, CN conjugated and NHCC components. At 150°C, the rate of degradation of the polymers is relatively slow. For PVI(1), approximately 50% of the polymer remained nonoxidized after 64 h of heating, whereas 80% of PVI(4) remained nonoxidized after 47 h of heat treatment. At 210°C, the degradation mechanisms involved three stages, with the duration of each stage quite different between the two polymers. No degradation of polyvinylimidazoles is observed in vacuum initially at 400°C. Prolonged heat treatment leads to evaporation of residual water, further complex formation, and, finally, evaporation of the polymer films.
TL;DR: In this paper, the ability of azole compounds, benzotriazole (BTA), 2-undecylimidazoles (UDI), and poly- N -vinylimidaze (PVI-1), to inhibit copper corrosion in humid environments is studied using Fourier transform infrared reflection-absorption spectroscopy (FT-IR RAS).
TL;DR: Polarization modulation infrared ellipsometric spectra were collected on an FT-IR spectrometer, with the use of two linear polarizers and a photoelastic modulator as discussed by the authors.
Abstract: Polarization modulation infrared ellipsometric spectra were collected on an FT-IR spectrometer, with the use of two linear polarizers and a photoelastic modulator. Samples consisted of thin poly(vinyl acetate) and poly(methyl methacrylate) films on gold substrates. The relative phase retardation (delta) and relative amplitude (psi) were derived from these measurements. These spectra were superior to those from static infrared ellipsometry measurements on the same samples. The thickness and optical constants of the films were calculated from the ellipsometric measurements and compared with reference optical constant spectra.
TL;DR: In this paper, the pyridine side group was found to react with the epoxy group, forming networks which contain pyridone and cyclic amide structures, and this reaction was observed also in the interfacial region of poly(vinylpyridine) and γ-glycidoxypropyltrimethoxysilane hydrolyzate coatings on poly(ethylene terephthalate) fiber substrates.
Abstract: Chemical reactions of poly(vinyl pyridine)s and epoxy compounds were studied both in homogeneous solution and in solid state by Fourier transform infrared spectroscopy and other techniques. The pyridine side group was found to react with the epoxy group, forming networks which contain pyridone and cyclic amide structures. This reaction was observed also in the interfacial region of poly(vinyl pyridine) and γ-glycidoxypropyltrimethoxysilane hydrolyzate coatings on poly(ethylene terephthalate) fiber substrates.
Die Reaktion zwischen Polyvinylpyridinen und Epoxyverbindungen wurde sowohl in homogenen Losungen als auch im festen Zustand mit Hilfe der Fourier-Transform-Infrarotspektroskopie und anderer Techniken untersucht. Es wurde beobachtet, das die Pyridinseitengruppe mit den Epoxygruppen unter Bildung von Netzwerken, die Pyridon- und cyclische Amidstrukturen enthalten, reagiert. Diese Reaktion wurde ebenso in der Grenzflachenregion zwischen Polyvinylpyridin und Uberzugen aus γ-Glycidoxypropyltrimethoxysilanhydrolysat auf Poly(ethylenterephthalat)-Fasern beobachtet.
TL;DR: In this article, a computerized micro-RIM machine was designed and built for the study of Nylon 6 reaction injection molding (RIM), which was used for interfacing with analytical instruments, molding of samples for mechanical testing, and precise control and monitoring of the RIM process.
Abstract: A computerized micro-RIM machine has been designed and built for the study of Nylon 6 reaction injection molding (RIM). This machine was designed for three major purposes: interfacing with analytical instruments, molding of samples for mechanical testing, and precise control and monitoring of the RIM process. The machine is capable of injecting a wide range of amounts of material, between 0.04 and 200.0 cm in steps of 0.04 cm. The accuracy of injections is ±0.004 cm. The micro-RIM machine has been interfaced with a Fourier transform infrared spectrometer (FT-IR). Infrared spectra have been recorded at 0.33 second intervals during the RIM process. This provides the capability for following the fast polymerization and crystallization of Nylon 6 RIM in situ and isothermally. The machine has also been used to mold samples of nylon 6 and nylon 6 reinforced with silicon whiskers.
TL;DR: In this article, the chemical reaction between pyridine and epoxy compounds has been investigated, and a reaction scheme based on spectral studies has been proposed to obtain the order of reactivity for different derivatives.
TL;DR: In this article, the interfacial interaction of the basal plane of graphite single crystals and poly(aryl-ether-etherketone) (PEEK) was investigated using Fourier transform infrared reflection-absorption spectroscopy (FT-IR-RAS).
Abstract: The interfacial interaction of the basal plane of graphite single crystals and poly(aryl-ether-etherketone) (PEEK) was investigated using Fourier transform infrared reflection-absorption spectroscopy (FT-IR-RAS). PEEK melt-quenched on the basal plane of a graphite single crystal does not show preferential orientation. However, upon annealing, the polymer chains crystallize perpendicularly to the basal plane of the graphite single crystal. The rate of this surface-induced orientation during crystallization is found to be dependent on the film thickness. These results were verified by using model compounds of PEEK and by calculations based on optical theories.
Book•
01 Jan 1986
14 Oct 1986