Facile synthesis of five 2D surface modifiers by highly selective photocyclic aromatization and efficient enhancement of oxygen permselectivities of three polymer membranes by surface modification using a small amount of the 2D surface modifiers
摘要:
A facile synthesis of novel five 2D (planar) surface modifiers having a triphenylbenzene derivatives as a 2D structure has been achieved by the highly selective photocyclic aromatization reaction. Efficient enhancement of oxygen permselectivities through the three polymer membranes has been achieved by adding a small amount (< 5.0 wt%) of the 20 surface modifiers. Among the five 2D surface modifiers, a modifier compound having oligoethylene oxide groups showed the best performance for the enhancement. These improvements were thought to be caused mainly by improvement of the solution selectivity on the membrane surface where the 2D surface modifiers were accumulated. In some of the surface-modified blend membranes, their plots in the P-O2(-alpha) graph were over or close to the upper boundary line by Robeson in 1991. Since all the membranes containing the 2D surface modifiers showed better permselectivities than the corresponding substrate membranes, it is very promising for the future. (C) 2013 Elsevier Ltd. All rights reserved.
Facile Synthesis of an Amphiphilic 1,3,5-Trisubstituted Benzene as a Novel Surface Modifier by Selective Photocyclic Aromatization and Efficient Improvement of Oxygen Permselectivity by the Addition of the Surface Modifier
Synthesis of a Fluorine-Containing Cis-Cisoidal One-Handed Helical Polyphenylacetylene and Application of Highly Selective Photocyclic Aromatization Product on Oxygen Permselective Membrane
one‐handed helical polymer. The ability and efficiency of the chiral induction of the fluorine‐containing monomer in the helix‐sense‐selective polymerization (HSSP) was much higher than those of a monomer having the corresponding alkyl group (M-H) we reported before. The resulting polymer P-F showed cis‐cisoidal one‐handed helical conformation, and was suitable for highlyselectivephotocyclic aromatization
A soluble and stable one-handed helical conjugated polymer without the coexistence of any other chiral moieties was successfully synthesized by asymmetric-induced polymerization of a chiral monomer having two hydroxyl groups followed by desubstitution of the chiralgroups in a solid membrane state. The reason for the success was the polymer reaction was carried out in the membrane state. This is an
New Achiral Phenylacetylene Monomers Having an Oligosiloxanyl Group Most Suitable for Helix-Sense-Selective Polymerization and for Obtaining Good Optical Resolution Membrane Materials
higher than that of a poly(phenylacetylene) membrane having alkyl groups. This was because the polymers having oligosiloxane groups had high regularity of structures, i.e., chemical structures of the macromolecules such as one handedness and high order structures such as columnar contents in the membranes, and the membranes were flexible and had almost no defects. These good properties as optical resolution
为了开发更适合于螺旋正义选择性聚合(HSSP)的新型苯基乙炔单体,我们先前曾报道过,并且为了提高HSSP的效率和所得聚合物的膜性能,具有柔性低聚硅氧烷基(S n BDHPA)的新型苯基乙炔与通过使用手性催化体系合成和聚合了其他三个相关的单体系列,并研究了从所得手性聚合物中渗透膜的对映选择性。小号Ñ BDHPA是最适合HSSP和CD吸收(g ^聚值)(S ÑBDHPA)比相应的具有刚性烷基的聚合物更坚固,更稳定。可以通过溶剂浇铸法将聚合物制备成柔性的自支撑膜。另外,多(S n)之一的渗透的对映选择性BDHPA)膜比具有烷基的聚(苯乙炔)膜高得多。这是因为具有低硅氧烷基团的聚合物具有高规则性的结构,即膜的单手性等大分子的化学结构和膜中的柱状内容物等高阶结构,并且膜具有挠性并且几乎没有缺陷。这些优良的作为光学分辨率膜材料的特性是由低聚硅氧烷链的柔韧性,疏水性和膨松性引起的。发现具有三硅氧烷基的S
Novel highly efficient
<i>absolute</i>
optical resolution method by serial combination of two asymmetric reactions from acetylene monomers having racemic substituents
For general opticalresolution, an opticalresolution agent is necessary, and the best agent should be selected for each racemic compound. In this study, we will report that a novel opticalresolutionmethod by circularly polarized light (CPL) without any opticalresolution agents has been developed by serially connecting two enantioselective reactions. These reactions we developed are the enantiomer-selective