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Water Absorption and Degraded Stress Relaxation Behavior in Water-Borne Anticorrosive Urethane/Epoxy Coatings

Journal of Chemistry and Chemical Engineering 2015年第2期9卷 75-89页

作者： yukitoshi Takeshita Ethan Becker Seizo Sakata Takuya Kamisho Takashi Miwa Takashi Sawada NTT Energy and Environment Systems Laboratories Nippon Telegraph and Telephone Corporation Tokyo 180-8585 Japan Chemistry and Engineering Physics University of Wiseonsin-Platteville W15 3818 USA

The kinetics of water absorption in water-borne anticorrosive urethane/epoxy coatings, which were actually introduced in the industrial field, are studied. It is found that the high water affinity of a water-borne coating supports a higher saturated water content, M∞, and helps to facilitate absorption D. The three parameters of stretched exponential function called the William-Watt equation, Eo, τ, and β, are determined to fit the degraded stress relaxation behavior in the water absorption process because this function quantitatively describes the relaxing ability and has been successfully used by a number of researchers. An increasing in the water content is shown to correlate strongly with a decrease in Eo and β early in the absorption process between Mt/M∞ = 0 and Mt/M∞ ≈ 0.5. The adhesive characteristics of the coatings are correlated with water content, and shown to exhibit higher cohesive failure in coating epoxies under saturated conditions. This suggests that water interferes with the intermolecular bonding between polymer chains which degrades the bulk materials ability to diffuse stress concentrations and reduces its overall strength.

关键词：应力松弛行为水性聚氨酯环氧树脂涂料防腐吸水性指数函数佛罗里达州环氧涂料

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Calcitriol-induced hypercalcemia in a patient with granulomatous mycosis fungoides and end-stage renal disease

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World Journal of Nephrology 2013年第2期2卷 44-48页

作者： Takamasa Iwakura Naro Ohashi Naoko Tsuji Yoshitaka Naito Shinsuke Isobe Masafumi Ono Tomoyuki Fujikura Takayuki Tsuji yukitoshi Sakao Hideo Yasuda Akihiko Kato Toshiharu Fujiyama Yoshiki Tokura Yoshihide Fujigaki First Department of Medicine Hamamatsu University School of Medicine Higashi-ku Hamamatsu 431-3192 Japan Blood Purification Unit Hamamatsu University School of Medicine Higashi-ku Hamamatsu 431-3192 Japan Department of Dermatology Hamamatsu University School of Medicine Higashi-ku Hamamatsu 431-3192 Japan

An 86-year-old man, diagnosed as having mycosis fungoides in May 2008 and treated with repeated radiation therapy, was admitted to our hospital for initiation of hemodialysis due to end-stage renal disease(ESRD) in April 2012. On admission, his corrected serum calcium level was 9.3 mg/d L, and his intact parathyroid hormone level was 121.9 pg/mL(normal range 13.9-78.5pg/mL), indicating secondary hyperparathyroidism due to ESRD. After starting hemodialysis, urinary volume diminished rapidly. The serum calcium level increased(12.7 mg/dL), and the intact parathyroid hormone level was suppressed(< 5 pg/m L), while the 1,25-dihy-droxyvitamin D3(calcitriol) level increased(114 pg/mL, normal range: 20.0-60.0 pg/m L) in June 2012. The possibilities of sarcoidosis and tuberculosis were ruled out. Skin biopsies from tumorous lesions revealed a diagnosis of granulomatous mycosis fungoides. The serum soluble interleukin-2 receptor levels and the degrees of skin lesions went in parallel with the increased serum calcium and calcitriol levels. Therefore, the patient was diagnosed as having calcitriol-induced hypercalcemia possibly associated with granulomatous mycosis fungoides. Granulomatous mycosis fungoides is rare, and its association with calcitriol-induced hypercalcemia has not been reported. Careful attention to calcium metabolism is needed in patients with granulomatous mycosis fungoides, especially in patients with ESRD.

关键词：血液透析肾病治疗方法临床分析

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