Results 101 to 110 of about 15,336 (235)
Journal of Lipid Research, 1997 pKas for the acid dissociation of the carboxyl groups of bilirubin in water have been reported recently to be 8.1-8.4, or higher. These high values were attributed to intramolecular hydrogen bonding.
F R Trull +3 more
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Esterification of dicarboxylic acids to diesters over Mn+-montmoril lonite clay catalysts [PDF]
, 2005 Esterification of dicarboxylic acids with various alcohols and phenols in presence of metal exchanged montmorillonite clay catalyst (Mn+-mont; Mnþ ¼ Al3þ, Fe3+, Cr3+, Zn2+, Mn2+, and Ni2+) is studied.
Gopalpur Nagendrappa, . +3 more
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Hypervelocity impact survivability experiments for carbonaceous impactors [PDF]
We performed a series of hypervelocity impact experiments using carbon-bearing impactors (diamond, graphite, fullerenes, phthalic acid crystals, and Murchison meteorite) into Al plate at velocities between 4.2 and 6.1 km/s.
Bada, Jeffrey +6 more
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Tackifier for addition polyimides [PDF]
A modification to the addition polyimide, LaRC-160, was prepared to improve tack and drape and increase prepeg out-time. The essentially solventless, high viscosity laminating resin is synthesized from low cost liquid monomers. The modified version takes
Butler, J. M., St.clair, T. L.
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Vinyl capped addition polyimides [PDF]
Polyimide resins (PMR) are generally useful where high strength and temperature capabilities are required (at temperatures up to about 700 F). Polyimide resins are particularly useful in applications such as jet engine compressor components, for example,
Delvigs, Peter +2 more
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Studies on Polyesters of Phthalic Acids
Kobunshi Kagaku, 1958 ビス (β・ヒドロキシエチル) テレフタレートを単独で加熱溶融した場合, 自己縮合反応の結果, エチレングリコールを放出する。このようにして生成したグリコールを一定時間ごとに過ヨウ素酸法によって定量し, エステル交換の反応速度を追跡した。この反応を密閉系で, 単独および少量のグリコールの存在で反応を開始せしめたところ, 平衡定数として1が得られた。比較的低温で, しかも無触媒反応の初期に限れば, 可逆反応を考慮に入れた2分子反応の形式にきわめてよく合致する。しかし比較的高温においては, エチレングリコールの一方の水酸基がエステル化されたものは, 熱分解を受けやすく, 定性的に酸およびアルデヒドが検出された。同時にこのことが原因となって, 触媒としてNa-アルコラートの存在する場合 ...
Misao Sumoto, Akira Kito, Ryozo Inoue
openaire +2 more sources
MoleculesThe formation of metal soaps or carboxylates in oil paintings is a widely studied topic. Expanding upon the extant research on the subject, this work investigates the formation of metal soaps as pertaining to alkyd-based media.
Tommaso Poli +5 more
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Hierarchical Structure with Highly Ordered Macroporous-Mesoporous Metal-Organic Frameworks as Dual Function for CO2 Fixation. [PDF]
, 2019 As a major greenhouse gas, the continuous increase of carbon dioxide (CO2) in the atmosphere has caused serious environmental problems, although CO2 is also an abundant, inexpensive, and nontoxic carbon source.
Chu, Junmei +8 more
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MoleculesSecondary metabolites, bioactive compounds produced by living organisms, can unveil symbiotic relationships in nature. In this study, soilborne entomopathogenic nematodes associated with symbiotic bacteria (Xenorhabdus stockiae and Photorhabdus ...
Gobinath Chandrakasan +5 more
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Development of an impact- and solvent-resistant thermoplastic composite matrix [PDF]
Synthesis, moldability and chloroform, acetone and tricresyl phosphate resistance of 16 polymer compositions are described. These aliphatic heterocyclic polymers include polyimides, polybenzimidazoles, and N-arylenepolybenzimidazoles.
Delano, C. B., Kiskiras, C. J.
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