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Yuanyi Shao,Masaya Matsushita,Yang Yang,Akio Ohtani,Defang Zhao,Ruohua Liu,Yuqiu Yang 한국섬유공학회 2020 Fibers and polymers Vol.21 No.5
In this work, nonwoven fabrics made from carbon fibers (CFs) and polypropylene (PP) fibers were manufacturedthrough a carding process and a cross-laying process and reinforced by either a needle punching method or a thermobondingmethod. The effects of the carding parameters (adding oil, increasing the gauge and decelerating the speed) andreinforcement method (needle punching method or thermobonding method) on the anisotropic mechanical properties of hotpressedCF/PP composites were investigated. Additionally, the length, distribution and orientation of carbon fibers in the hotpressedcomposites were studied. The carbon fibers were oriented by the carding method, and the composites exhibitedanisotropic properties. Moreover, the fiber distribution results indicated that increasing the gauge and decelerating the speedhad a slightly negative influence on the distribution of carbon fibers and that the cross-laying process led to a uniformdistribution of fibers. Furthermore, adjusting the carding parameters and reinforcement method could reduce the damagesustained by carbon fibers during manufacturing and subsequently improve the mechanical properties of the CF/PPcomposites in the transverse direction (TD).
Total Synthesis of Pactalactam, an Imidazolidinone-Type Pactamycin Analogue
Kim, Taejung,Matsushita, Shohei,Matsudaira, So,Doi, Tsuyoshi,Hirota, Shinji,Park, Young-Tae,Igarashi, Masayuki,Hatano, Masaki,Ikeda, Noriko,Ham, Jungyeob,Nakata, Masaya,Saikawa, Yoko THE AMERICAN CHEMICAL SOCIETY 2019 ORGANIC LETTERS Vol.21 No.10
<P>The first total synthesis of pactalactam was accomplished using substrate-controlled stereoselective aziridination and regioselective aziridine ring-opening to construct three continuous amino groups on an octasubstituted cyclopentane core. The cyclopentane framework was obtained by ring-closing metathesis and aldol coupling using a <SMALL>L</SMALL>-threonine-derived oxazoline compound. Cyclic urea formation, <I>m</I>-acetylphenyl group introduction by Chan-Lam coupling, and primary alcohol-selective acylation yielded the reported pactalactam structure. The presence of pactalactam in the fermentation broth of pactamycin-producing bacteria was also confirmed.</P> [FIG OMISSION]</BR>