通过具有邻苯二酚和芳族二氯化物基团的AB型单体的自聚合反应,设计并合成了一种具有内在微孔性,具有二苯并二恶烷键和双(吩嗪)单元的新型可溶液处理的梯型聚合物(PSBI-AB)。这种聚合是合成高分子量聚合物的有效方法,并且由于不需要严格控制化学计量平衡,因此具有比AA-BB缩聚显着的优势。该协议可用于从其芳族四甲氧基前体制备各种含吩嗪的阶梯型PIM。所获得的聚合物具有高的平均分子量,优异的热稳定性,高的BET表面积为705m 2 g -1并且在一些有机溶剂如氯仿,良好的溶解性米甲酚和二氯苯。气体渗透率测量结果表明,与以前报道的类似PIM-7相比,在相同的形成方案下生产的薄膜具有可比的结果。
Organic compounds of formula I may be used in optoelectronic devices
wherein
R
1
is, independently at each occurrence, a C
1
-C
20
aliphatic radical, a C
3
-C
20
aromatic radical, or a C
3
-C
20
cycloaliphatic radical;
R2 is, independently at each occurrence, a C
1
-C
20
aliphatic radical, a C
3
-C
20
aromatic radical, or a C
3
-C
20
cycloaliphatic radical;
a is, independently at each occurrence, an integer ranging from 0-4;
b is, independently at each occurrence, an integer ranging from 0-3;
Ar
1
is a direct bond or heteroaryl, aryl, or alkyl or cycloalkyl;
Ar
2
is heteroaryl, aryl, or alkyl or cycloalkyl;
c is 0, 1 or 2; and
n is an integer ranging from 2-4.
The Condensation of Polyhydric Phenols with Acetone
作者:C. Harold Fisher、Robert W. Furlong、Morton Grant
DOI:10.1021/ja01296a042
日期:1936.5
Remesat,K., Diss. <Univ. Berlin 1930> S. 32
作者:Remesat,K.
DOI:——
日期:——
CROSS-LINKED RUBBERY POLYURETHANE-ETHER MEMBRANES FOR SEPARATIONS
申请人:UOP LLC
公开号:US20150114224A1
公开(公告)日:2015-04-30
Cross-linked rubbery polyurethane-ether polymeric membranes are made from cross-linked rubbery polyurethane-ether polymers that are synthesized from a diisocyanate-terminated polyether and a tetrol with four hydroxyl functional groups. The hydroxyl groups on the tetrol react with the isocyanate groups on the diisocyanate-terminated polyether to form urethane bonds. The cross-linked rubbery polyurethane-ether polymeric membrane selectively permeate condensable vapors such as C
3
to C
35
hydrocarbons, aromatics, water vapor, carbon dioxide, and hydrogen sulfide and rejects methane and ethane. The cross-linked rubbery polyurethane-ether polymeric membrane have high permeance for condensable vapors, high selectivity for condensable vapors over methane and ethane, and high resistance to liquid chemicals.
The present invention has an object to provide a polymerizable liquid crystal composition capable of manufacturing an optically anisotropic film having excellent light fastness; and an optically anisotropic film, an optical film, a polarizing plate, an image display device, and an organic electroluminescent display device, each of which uses the polymerizable liquid crystal composition. The polymerizable liquid crystal composition of an embodiment of the present invention contains a polymerizable liquid crystal compound having reverse-wavelength dispersion properties and an aromatic polyether-based compound.