巻号一覧
15 巻 (1988)
- 4 号 p. 147-
- 3 号 p. 97-
- 2 号 p. 59-
- 1 号 p. 2-
15 巻, 2 号
選択された号の論文の6件中1～6を表示しています
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横田 洋, 熊谷 俊弥, 水田 進1988 年 15 巻 2 号 p. 59-64
発行日: 1988/04/30
公開日: 2009/09/07
ジャーナル フリーPyrolyses of yttrium organic acid salts, i. e., caprylate, laurate, stearate, naphthenate and octylate, were studied in the temperature range of 25∼600°C in Ar or air flow by thermogravimetry (TG)-differential thermal analysis (DTA), infrared and X-ray analyses. Pyrolysis in Ar flow was found to take place in two stages; decomposition reaction of the salt and subsequent evaporation of the organic component; on the other hand, rapid decomposition and simultaneous combustion of the organic component take place in air. Pyrolysis temperatures in Ar were significantly dependent on the organic part of the salts as follows.
normal chain < cyclic < branched chain
The solid product of the pyrolysis at 400∼500°C was amorphous Y2O3, which was crystallized above 550°C both in Ar and air.抄録全体を表示PDF形式でダウンロード (890K) -
吉田 博久1988 年 15 巻 2 号 p. 65-69
発行日: 1988/04/30
公開日: 2009/09/07
ジャーナル フリーThe enthalpy relaxation process was analyzed for the engineering plastics, such as poly (ether sulfone), poly (ether imide), polysulfone and poly (ethylene terephthalate). In order to compare the rate of enthalpy relaxation, the enthalpy relaxation time at half of initial excess enthalpy (τ1/2) was evaluated at each annealing temperature (Ta). From the relationship between log τ1/2 and Tg-Ta, the rate of enthalpy relaxation was estimated. It was found that the rate of the engineering plastics was faster than that of polystyrene. The ether bond of the main chain of these engineering plastics seems to rotate easily in the glassy state.抄録全体を表示PDF形式でダウンロード (697K) -
橋本 寿正, 武井 信広, 高久 明1988 年 15 巻 2 号 p. 70-74
発行日: 1988/04/30
公開日: 2009/09/07
ジャーナル フリーThermoluminescence (TL) and oxyluminescence (OL) have been observed in polyacylonitrile (PAN) films heat-treated at elevated temperatures in vacuum and in air. In the TL curve of untreated PAN, two peaks was observed at 110 and 160°C. The peak at 110°C was attributed to the molecular motions in the paracrystalline and the peak at 110°C was the amorphous phases, respectively. The pattern of TL glow curves, in both shape and intensity, vary in a characteristic manner reflecting the heat-treatment condition.
When polymers are heated in air or oxygen atmosphere at high temperature, a light emission caused by oxydation is observed as a function of temperature. This phenomenon is called OL. The OL peak observed in the heat-treated PAN was also attributed to the molecular relaxation of PAN. It was shown that these two analysis are useful tool for investigation of the degradation and oxydation of PAN, since these are very sensitive method compared with conventional analysis such as IR spectra or DSC.抄録全体を表示PDF形式でダウンロード (759K) -
中村 邦雄, 小林 正隆1988 年 15 巻 2 号 p. 75-79
発行日: 1988/04/30
公開日: 2009/09/07
ジャーナル フリーThis paper investigated the thermal behavior of polyarylsulfone (PSF) films aged by hydrochloric (HCl) and nitric acids (HNO3). The thermal decomposition and glass transition of PSF films were evaluated using thermogravimetry (TG) and differential scanning calorimetry (DSC). The TG curve of untreated PSF film shows a two-stage process, while TG curves of aged films show a three-stage process. The weight loss which was found in the aged films at low temperature region, below 300°C, is considered to be due to the decomposition of PSF with low molecular weight. This suggests that a part of PSF is decomposed by HCl and HNO3. The glass transition temperature (Tg) of PSF decreased as the period of treatment in the acids was increased. However, Tgs of the samples increased when the samples were immersed in 15% HCl, concentrated HCl and 15% HNO3 for more than 120 days. The decrease of Tg showed a good linear relationship with the increase of weight loss near 230°C.抄録全体を表示PDF形式でダウンロード (752K) -
藤枝 修子1988 年 15 巻 2 号 p. 80-87
発行日: 1988/04/30
公開日: 2009/09/07
ジャーナル フリーIn the heat exchange calorimetry, heat evolved in the sample vessel placed in a water bath was exchanged freely with the ambient water. The thermal process was expressed by a simple differential equation. In practice, the temperature observed as an electric signal via a thermistor includes delay of response which was also expressed by a differential equation. Calorimeter systems of batch and titration types were constructed for estimation of total heat involving on-line and real time data processing of analog and digital computations. Appropriateness of the calorimetry proposed was examined by estimating total heat of reaction of THAM with 0.1mol dm-3 HCl for exothermic reaction and heat of solution of solid KCl to water for endothermic reaction. In both of batch and titration experiments, satisfactory results were obtained in comparison with those recommended by Montgomery et al. in 1977. In addition, instantaneous heat effect evolved electrically as a step function was followed with sufficiently speedy response.抄録全体を表示PDF形式でダウンロード (1218K) -
前田 佳均, 峯村 哲郎, 安藤 寿1988 年 15 巻 2 号 p. 88-90
発行日: 1988/04/30
公開日: 2009/09/07
ジャーナル フリーPDF形式でダウンロード (431K)
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