Local lamellar organisation of discotic mesogens carrying fluorinated tails
摘要:
对一系列圆盘状液晶、单体和二聚体进行了研究。用全氟链取代了与中间体的五(苯乙炔基)苯氧基核心相连的间隔物,以研究这些基团的微相分离效应。氟化基团的存在极大地稳定了这些介聚物常见的向列相。X 射线衍射研究清楚地表明,向列相中开始出现纳米相分离。值得注意的是,纳米相分离将系统引向了片状组织,而不是圆盘状介质中常见的柱状秩序。底层结晶相的有序性也证实了这一点。对向列相进行的 X 射线衍射研究显示了线状聚类的特征,这是迄今为止在盘状介质系统中尚未观察到的。
Fluorinated multifunctional alcohols containing at least 3 primary hydroxyl groups are disclosed. Such alcohols allow for easy synthesis of multifunctional crosslinkers such as acrylates, epoxies and vinyl ethers. The multifunctional crosslinkers are used in fluorinated optical coating and waveguide compositions to increase curing speed and crosslinking density.
perfluorinated alkyl chains, separated by two methylene groups from the tetrazine core, a new series of analogous tetrazines, but featuring only one methylene group between the fluorescent core and the perfluorinated chain, have been synthesized, and their photo-physical properties investigated. Their fluorescence quantum yields in acetonitrile are in same range than chloroalkoxytetrazines, which make them interesting
POLYCARBONATE-BASE POLYMER, PRODUCTION PROCESS, RESIN COATING FLUID PREPARED THEREFROM, AND ELECTROPHOTOGRAPHIC PHOTORECEPTOR PREPARED THEREFROM
申请人:IDEMITSU KOSAN COMPANY LIMITED
公开号:EP0837085A1
公开(公告)日:1998-04-22
A polymer comprising mainly repeating units (1) and/or repeating units (2), containing optionally terminal groups (3) and/or repeating units (4), and having a reduced viscosity [ηsp/c] of 0.2 to 10.0 dl/g as measured in a 0.5 g/dl solution thereof in methylene chloride at 20°C; a resin coating fluid containing the polymer, a charge-transfer substance and a solvent; and an electrophotographic photoreceptor containing the polymer as a binder resin in a photosensitive layer, wherein Rf1 represents a group that is composed of at least carbon atoms and fluorine atoms and bonded directly to the two oxygen atoms of the carbonate linkage in the general formula (1) without any intervening arylene group; and Rf2 represents a group that is composed of at least carbon atoms and fluorine atoms and bonded directly to one of the oxygen atoms of the carbonate linkage in the general formula (3) without any intervening arylene group.
The invention relates to a system for coating an optical glass fiber comprising a radiation-curable inner primary coating composition and a radiation-curable outer primary coating composition wherein:
said inner primary coating composition comprises an oligomer having at least one functional group capable of polymerizing under the influence of radiation, said inner primary coating composition after radiation cure having the combination of properties of:
(a) a fiber pull-out friction of less than 40 g/mm at stripping temperature;
(b) a crack propagation of greater than 1.0 mm at stripping temperature;
(c) a glass transition temperature of below 10°C; and
(d) sufficient adhesion to said glass fiber to prevent delamination in the presence of moisture and during handling; and
said outer primary coating composition comprises an oligomer having at least one functional group capable of polymerizing under the influence of radiation, said outer primary coating composition after radiation cure having the combination of properties of:
(e) a glass transition temperature of above 40°C; and
(f) a modulus of elasticity of between about 10 MPa to about 40 MPa at stripping temperature;
and wherein the ratio of the change in length of said inner primary coating composition, after radiation cure, to the change in length of said outer primary coating composition, after radiation cure, is less than 2 when said cured compositions are heated from 25°C to stripping temperature.
The invention further relates to an inner primary coating, a coated optical fiber and a ribbon assembly with such a coated optical fiber having above described characteristics.
The invention provides an adhesive composition including a specific phosphate group-containing monomer (a) having a fluorocarbon group, and a solvent (b).
An adhesive composition that is suitably used in the fields of medical care, electronic industry, precision machinery industry, jewel industry and so on, exhibits high bond strength and high adhesive durability and is minimally varied in bond strength is provided. The adhesive composition of this invention exhibits high adhesive durability and high coloring resistance on dental restorative materials such as ceramics, a composite resin cured substance, porcelain and a metal, and in particular, on a novel dental restorative material such as hybrid ceramics or a metal oxide-based high strength ceramics, and therefore it is suitably used in the dental field.