Diastereomeric triamines containing two helicene moieties, 1,12-dimethylbenzo[c]phenanthrene, were synthesized and found to form folded structures in the water. Such folding was not observed for an achiral compound possessing a naphthalene moiety. The (M,M)-dihelicenetriamine with matching configuration at the helicene moieties formed a more stable folded structure than the (P,M)-isomer containing two enantiomeric helicene groups. The most stable folded conformation was predicted by the Monte Carlo method with Amber force field of the dihelicenetriamine. (C) 2002 Elsevier Science Ltd. All rights reserved.
Sulfate-Selective Binding and Sensing of a Fluorescent [3]Rotaxane Host System
作者:Matthew J. Langton、Paul D. Beer
DOI:10.1002/chem.201202204
日期:2012.11.5
The chloride‐templated synthesis of a novel [3]rotaxane, capable of binding anionic guests, and incorporating a naphthalene group for fluorescence sensing is reported. Extensive 1H NMR titration studies were used to probe the anion binding selectivity of the system. The rotaxane selectively recognises sulfate, undergoing an induced conformational change upon sulfate binding to form a 1:1 stoichiometric
报道了一种新型的[3]轮烷的氯化物为模板的合成,它能够结合阴离子客体,并引入用于荧光传感的萘基。广泛的1 H NMR滴定研究用于探测系统的阴离子结合选择性。轮烷选择性地识别硫酸盐,在硫酸盐结合后发生诱导的构象变化,形成1:1的化学计量夹心型复合物,并伴随荧光的显着猝灭。单阴离子客体的结合会导致化学计量的客体与主体的化学计量比为2:1,并适度地提高了排放。在非竞争性溶剂中添加过量的硫酸盐也会导致2:1的发射复合物。
POLYAMIDE RESIN COMPOSITION
申请人:UBE Industries, Ltd.
公开号:EP3412731A1
公开(公告)日:2018-12-12
Provided is a polyamide resin composition which comprises a polyamide resin (A) and an impact-resistant material (B), wherein the polyamide resin (A) comprises an aliphatic copolyamide (A-1) comprising three or more types of monomers and an aliphatic polyamide (A-2), wherein the content of the aliphatic copolyamide (A-1) in the polyamide resin composition is 1% by mas to 30% by mass.
A multilayer tube is provided which includes a layer including a specific aliphatic polyamide composition and a layer including a semi-aromatic polyamide composition including a semi-aromatic polyamide with a specific structure, these layers being adjacent to each other, wherein the aliphatic polyamide composition includes an aliphatic polyamide having a specific ratio of the number of methylene groups to the number of amide groups, a polyamide having a specific difference in absolute value of solubility parameter SP from the aliphatic polyamide, and an elastomer polymer including a structural unit derived from an unsaturated compound having a carboxyl group and/or an acid anhydride group.
POLYAMIDE RESIN COMPOSITION, AND POLYAMIDE RESIN COMPOSITION FOR ROTATION MOLDING AND ROTATION MOLDED ARTICLE USING SAME
申请人:UBE Industries, Ltd.
公开号:EP3683272A1
公开(公告)日:2020-07-22
The present invention provides a polyamide resin composition having excellent low-temperature impact resistance and surface property, a polyamide resin composition for rotational molding and a rotational molded article using the same. The polyamide resin composition according to the present invention comprises: a component (A) in an amount of a parts by weight, which is an aliphatic polyamide having a relative viscosity ηr of less than 2.6 as measured according to JIS K6920 under the conditions of 96 wt% of sulfuric acid, 1 wt% of the polymer concentration, and 25°C; a component (B) in an amount of b parts by weight, which is a modified polyolefin having a density of 0.895 g/cm3 or less as measured according to ASTM D1505; and a component (C) in an amount of c parts by weight, which is a non-modified polyolefin having an MFR value of 3.0 to 30 g/10min as measured in a load of 2.16 kg at 190°C; wherein the polyamide resin composition satisfies the following equations: 50 ≤ c/(b+c)×100 ≤ 70, and 10 ≤ (b+c)/(a+b+c)×100 ≤ 40.