Nitration and Amination of Poly(diphenylacetylene)s and Their Properties

Poly[1-phenyl-2-[p-(tritnethylsilyl)phenyl]acetylene] [PTMSDPA] was synthesized by metathesis polymerization. PTMSDPA was nitrated using the mixture of sulfuric acid and nitric acid to give a nitrated polymer. Amination of the nitrated polymer was achieved by the reduction of nitro groups with SnCl_2 • 2H_2 O using polymer membrane. Nitration and Amination were confirmed by comparison of IR spectra before and after reaction, although the molecular weights of polymers were decreased during nitration reaction. Nitrated poly(diphenylacetylene) exhibited high gas permeability. Aminated polymers was much higher the CO_2 permselectivity of than that of the other poly(diphenylacetylene)s. Aminated polymers exhibited high CO_2 permselective and relatively high gas permeability, and hence they are promising candidates for CO_2 separation membranes

Synthesis of Novel Polymers Containing Fluorenes and Their Gas Permeability

To develop new membrane materials, poly(fluoreneethynylene)s [PFEs] having alkyl groups at 9-position of fluorene were synthesized by ADIMET polymerization. PFEs with 2-ethylhexyl groups (2a) and dodecyl groups (2b) were obtained in high yields and their weight-average molecular weights were as high as 524,000 and 781,000 , respectively. The obtained polymers were soluble in CHCI3 and partly soluble in toluene and THF. Polymer (2d) was synthesized by Pd/Cu-catalyzed polymerization. The free-standing membranes of (2a) and (2d) could be prepared by solvent-casting method, and the gas permeability was measured. Their gas permeability was almost the same as that of poly(p-phenyleneethynvlen e)s reported previously

Arginine enriched EN after total gastrectomy

The effects of early enteral arginine-rich nutrition (EAN) were analyzed among patients undergoing curative-intent total gastrectomy for gastric cancer. There were 19 patients in this prospective study, all randomly assigned to either a parenteral nutrition (PN) group or an EAN group for the first seven days after surgery. The EAN group received 1.8-fold greater arginine (10.1 g / day) compared with the PN group, which was administered through an enteral tube inserted into the jejunal loop. Both groups were provided almost identical amounts of total amino acids (54 g / day), and the total energy was set at 65% of the total requirement (25 kcal / kg / day). No significant differences were observed between the two groups in postoperative complications, length of hospital stay, oral intake, nutritional status, or body weight. The serum arginine profile was similar in the two groups, as it decreased significantly on postoperative day (POD) 1, and gradually returned to preoperative levels by POD 7. The nitrogen balance remained negative until POD 7 in the PN group, but turned neutral at POD 7 in the EAN group. While we could not confirm body weight loss improvement, these results suggested that early arginine-rich enteral nutrition could improve the nitrogen balance after total gastrectomy

Synthesis of Trifunctional Poly(propylene glycol) with Acetal Linkages and Properties of Chemically Recyclable Crosslinked Polyurethanes Prepared Therefrom

The synthesis and characterization of chemically recyclable crosslin.ked polyurethanes were studied in this work. Acetal units were introduced into polypropylene glycol having three hydroxyl terminal groups (PPG) by the reaction of the hydroxy groups of PPG with 4-acetoxybutyl vinyl ether followed by conversion of the acetate groups into hydroxy groups. Crosslinked polyurethanes were prepared by the reaction of the acetal-containing polyols (PPG-acetal-OH) with tolylene diisocyanates (TDI) at 120 °C under vacuum. The obtained polyurethanes formed elastomeric films and exhibited good mechanical properties. The treatment of the polyurethane films with aqueous acid at room temperature caused smooth hydrolysis of their acetal units to give PPG as a degradation product

シンキ ポリ ジアリールアセチレン ノ ゴウセイ トクセイ オヨビ キタイ トウカセイ

京都大学0048新制・課程博士博士(工学)甲第12286号工博第2615号新制||工||1369(附属図書館)24122UT51-2006-J279京都大学大学院工学研究科高分子化学専攻(主査)教授 増田 俊夫, 教授 中條 善樹, 教授 伊藤 紳三郎学位規則第4条第1項該当Doctor of EngineeringKyoto UniversityDA