摘要:
An ionic metallocene catalyst for olefin polymerization which comprises: (1) a cyclopentadienyl-type ligand, a Group IVB transition metal, and alkyl, aryl, or hydride substituents, as a cation, and (2) a weakly coordinating anion comprising boron substituted with halogenated, such as tetra fluoro, aryl substituents preferably containing silylalkyl substitution, such as para-silyl t-butyldimethyl.
摘要:
The organolanthanide hydrides (Cp'.sub.2 LnH).sub.2 (Cp'=.eta..sup.5 -Me.sub.5 C.sub.5 ;Ln=Sm,Lu) rapidly catalyze the copolymerization of methylenecyclopropane and ethylene to cleanly yield high molecular weight polyolefins of microstructure {[CH.sub.2 CH.sub.2 ].sub.x [CH.sub.2 CH.sub.2 C(CH.sub.2)].sub.y }n via sequential olefin insertion and ring-opening/.beta.-alkyl shift processes. Homopolymerization of methylenecyclopropane likewise cleanly yields polymers of the structure [CH.sub.2 CH.sub.2 C(CH.sub.2)].sub.n.
摘要翻译:有机镧系元素氢化物(Cp'2LnH)2(Cp'= eta 5-Me5C5; Ln = Sm,Lu)快速催化亚甲基环丙烷和乙烯的共聚,以清洁地得到高分子量微观结构的聚烯烃{[CH 2 CH 2] x [CH2CH2C )] y} n经由顺序的烯烃插入和开环/β-烷基转移过程。 亚甲基环丙烷的均聚同样干净地得到结构[CH2CH2C(CH2)] n的聚合物。
摘要:
The regiospecific (1,2-Me.sub.2 C.sub.5 H.sub.3).sub.2 ZrMe.sup.+ MeB(C.sub.6 F.sub.5).sub.3 - mediated ring-opening polymerization of methylenecyclobutane and its copolymerization with ethylene to polyolefins of microstructure --{CH.sub.2 CH.sub.2 CH.sub.2 C(CH.sub.2)]--.sub.n and {--[CH.sub.2 CHR]--.sub.x [CH.sub.2 CH.sub.2 CH.sub.2 C(CH.sub.2)]--.sub.y }.sub.n, respectively is disclosed.
摘要:
The synthesis of a nonlinear chromophoric co-monomer 3,5-diamino-4'-nitrodiphenylamine and use as a reactive component in combination with a bismaleimide monomer in a NLO-active polyimide matrix is disclosed. After concurrent corona or contact poling and thermal polymerization, thin films of these chromophoric polyimides exhibit high second harmonic generation efficiencies and high DSC-determined glass transition temperatures. These poled polyimides also exhibit excellent SHG temporal stability, retaining 85-90% of the initial second harmonic efficiency after more than one month in air at 85.degree. C.
摘要:
The synthesis, and use as precatalysts of chiral organozirconium complexes for olefin polymerization are disclosed, having the structure (C.sub.5 R'.sub.4-x R*.sub.x) A (C.sub.5 R".sub.4-y R'".sub.y) M Q.sub.p, where x and y represent the number of unsubstituted locations on the cyclopentadienyl ring; R', R", R'", and R* represent substituted and unsubstituted alkyl groups having 1-30 carbon atoms and R* is a chiral ligand; A is a fragment containing a Group 13, 14, 15, or 16 element of the Periodic Table; M is a Group 3, 4, or 5 metal of the Periodic Table; and Q is a hydrocarbyl radical, or halogen radical, with 3.ltoreq.p.ltoreq.o. Related complexes may be prepared by alkylation of the corresponding dichorides. In the presence of methylalumoxane or triarylborane cocatalysts, these complexes form "cation-like" species which are highly active for olefin polymerization. In combination with a Lewis acid cocatalyst, propylene or other .alpha.-olefin polymerization can be effected with very high efficiency and isospecificity.
摘要:
Separation of U.sup.235 and U.sup.238 isotopes by converting a mixture of these isotopes to organic compounds or to silicon compounds and then irradiating the isotope compounds selectively to change their chemical (and/or physical) properties, thereby to facilitate separation. In a preferred embodiment of the invention the uranium compounds are selected from the group having a chemical moiety R bonded directly to the U atom, the U-R bond having a fundamental, overtone, or combination virbational absorption frequency between 900 and 1100 cm.sup.-1. The selected U mixture is then irradiated with a frequency-selective CO.sub.2 laser.
摘要:
Electro-optic (EO) modulator and related device structures which can be used in conjunction with high EO materials to lower switching voltage and improve related performance parameters.
摘要:
An efficient and highly Markovnikov selective organoactinide-, organolanthanide-, and organozirconium-catalyzed addition of aryl, benzyl, and aliphatic thiols to terminal alkynes is described. The corresponding vinyl sulfides are produced with little or no side-products.
摘要:
An organic photovoltaic device and method of forming same. In one embodiment, the organic photovoltaic device has an anode, a cathode, an active layer disposed between the anode and the cathode; and an interfacial layer disposed between the anode and the active layer, the interfacial layer comprising 5,5′-bis[(p-trichlorosilylpropylphenyl)phenylamino]-2,2′-bithiophene (PABTSi2).
摘要:
Disclosed are metal oxide-polymer composites having a substrate comprising a metal oxide component, an aluminum oxide component, and a metallocene olefin polymerization catalyst component coupled to the substrate. The compositions can be used as thin films in an insulator device. Also disclosed is a method of preparing such compositions.