Results 111 to 120 of about 26,167 (268)

Hierarchical Structure with Highly Ordered Macroporous-Mesoporous Metal-Organic Frameworks as Dual Function for CO2 Fixation. [PDF]

open access: yes, 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
core   +1 more source

Study of improved resins for advanced supersonic technology composites. Part 1: Heteroaromatic polymers containing ether groups. Part 2: Curing chemistry of aromatic polymers and composite studies [PDF]

open access: yes
Fourteen ether-containing, aromatic dianhydrides have been synthesized from N-phenyl-3 or 4-nitrophthalimide and various bisphenols. The process involves nucleophilic displacement of activated nitro groups with bisphenolate ions.
Hillig, W. B.   +2 more
core   +1 more source

New Condensation polyimides containing 1,1,1-triaryl-2,2,2-trifluoroethane structures [PDF]

open access: yes, 1989
The invention relates to a condensation polyimide containing a 1,1,1-triaryl 2,2,2-trifluoroethane structure and other related condensation polyimides.
Alston, William B., Gratz, Roy F.
core   +1 more source

Adsorption of Monobutyl Phthalate from Aqueous Phase onto Two Macroporous Anion-Exchange Resins

open access: yesJournal of Chemistry, 2014
As new emerging pollutants, phthalic acid monoesters (PAMs) pose potential ecological and human health risks. In the present study, adsorption performance of monobutyl phthalate (MBP) onto two macroporous base anion-exchange resins (D-201 and D-301) was ...
Zhengwen Xu   +5 more
doaj   +1 more source

N-heterocyclic carbene-catalyzed atroposelective synthesis of N-Aryl phthalimides and maleimides via activation of carboxylic acids

open access: yesNature Communications
Traditionally, N-aryl phthalimides are synthesized by the condensation of phthalic anhydride and aniline derivatives, usually proceeding under harsh conditions.
Soumen Barik   +2 more
doaj   +1 more source

Studies on Polyesters of Phthalic Acids

open access: yesKobunshi 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

Track recording plastic compositions [PDF]

open access: yes, 1983
Improved nuclear track recording plastic compositions are provided which exhibit greatly decreased surface roughness when etched to produce visible tracks of energetic nuclear particles which have passed into and/or through said plastic.
Tarle, Gregory
core   +1 more source

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