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        Preparation and Characterization of Electrospun Polyimide Microfibrous Mats with High Whiteness and High Thermal Stability from Organo-soluble Polyimides Containing Rigid-rod Moieties

        Chen-yu Guo,Jin-gang Liu,Lu-meng Yin,Meng-ge Huangfu,Yan Zhang,Xiao Wu,Xiu-min Zhang 한국섬유공학회 2018 Fibers and polymers Vol.19 No.8

        A series of flexible and tough polyimide (PI) microfibrous mats (PI-1~PI-4) have been prepared via the one-step electrospinning procedure with the organo-soluble PI resins as the starting materials. For this purpose, four PI resins were first synthesized by the chemical imidization reaction from 2,2'-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) and four aromatic diamines containing rigid-rod moieties in their molecular skeletons, respectively. The PI resins derived from 6FDA and aromatic diamines, including PI-1 from 2-(4-aminophenyl)-5-aminobenzimidazole (APBI), PI-2 from 2-(4-aminophenyl)-5-aminobenzoxazole (APBO), PI-3 from 4,4′-diaminobenzanilide (DABA), and PI-4 from 2- chloro-4,4-diaminobenzanilide (Cl-DABA) exhibited good solubility in polar aprotic solvents, such as N-methyl-2- pyrrolidone (NMP) and N,N-dimethylacetamide (DMAc). Flexible and tough microfibrous mats were successfully prepared by a one-step electrospinning procedure from the PI/DMAc solution (solid content: 15-20 wt%; absolute viscosity: 8000- 10000 mPa·s). The derived PI mats exhibited good whiteness according to the CIE Lab measurements with W (whiteness) values as high as 94.31, L (lightness) values higher than 94.00, b* (yellowness) values as low as 2.98 and yellow indices (YI) as low as 4.87. In addition, the prepared PI mats exhibited excellent thermal and dimensional stability with the glass transition temperatures (Tg) higher than 345 oC and linear coefficients of thermal expansion (CTE) as low as 27.8×10-6 /K.

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        Two Kinds of Value Orientations in the Confucian Culture of Filial Piety

        ( SHANG Yong-liang ),( GE Gang-yan ) 성균관대학교 유교문화연구소 2014 儒敎文化硏究(中文版) Vol.0 No.21

        申生“敬順事上”卻屢被讒毁, “將以悅親”反受辱身亡, 這一事實本身即說明了“家天下”政治之複雜和殘酷, 說明了“愚孝”、“愚忠”之不可爲;後人所謂“申生孝而不能安晉”, 實在是對申生之“孝”所起作用的一種高估, 缺乏對中國儒家“孝”文化的深層透視。就本質言, 申生之死乃是其對儒家孝文化理解的偏執, 是其“小心精潔”的性格特點所使然;他的悲劇, 與其說是家庭層面的倫理悲劇、國家層面的政治悲劇, 毋寧說是一種緣於人性深處的性格悲劇, 以及緣於中國早期孝道深厚浸染的文化悲劇。 Shen Sheng (申生) was respectful to his elders, though he repeatedly received death threats from them; he cheerfully gave affection for his father, though he was inhumanly killed by him. His story actually explains the complexity and hidden cruelty of the family-state politics, and it also explains what may be called “foolish filial piety” and “foolish loyalty.” Shen Sheng’s filial piety and loyalty have often evaluated highly; however, such an evaluation does not offer deep understanding of the Confucian culture of filial piety. As for the essence of the culture, Shen Sheng’s death shows an obsession with the culture of filial piety. His story is neither simply a tragedy at the level of the family nor a tragedy at the level of state politics; rather, it should be understood as the kind of tragedy that stems from human nature itself and the inbuilt structure of the Chinese traditional culture of filial piety. [Article in Chinese]

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