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We presented a study on the effects of low-temperature (LT) AlN buffer growth time and surface morphology on the properties of high-temperature (HT) AlN epitaxial films using metal-organic chemical vapor deposition. Atomic force microscopy, Double crystal X-ray diffraction, Raman test and optical transmission measurement were employed to characterize the four HT AlN samples with different LT AlN buffer...
Fluorinated polyurethane–acrylate (FPUA) hybrid emulsion was prepared by copolymerization of polyurethane, methyl methacrylate, and 1H,1H,2H,2H‐heptadecafluorooctyl acrylate (FA) via emulsion polymerization in the presence of a perfluoronated reactive surfactant. The polyurethane was synthesized from isophorone diisocyanate, poly(propylene glycol)‐1000, dimethylolpropionic acid, 1,4‐butanediol, and...
Piezoelectrets made by cross-linked polypropylene (XPP) foam sheet are prepared by hot-stretching process. The microstructure of stretched films is observed by SEM technique. The piezoelectric d33-coefficients of the samples, with various degrees of elongation, are determined by a quasi-static method. The applied pressure dependence of piezoelectric d33-coefficients is investigated. The influence...
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