摘要:
Novel boron/nitrogen compounds having the formula (1): ##STR1## and the products of the at least partial reduction thereof, are converted into BN ceramic materials by thermally polymerizing same, whether or not in the presence of suitable polymerization catalyst, and then pyrolyzing the boron/nitrogen polymers thus obtained.
摘要:
An elastomeric composition usable for the manufacture of tires, based on at least (i) a diene elastomer, (ii) an inorganic filler as reinforcing filler and (iii), as (inorganic filler/diene elastomer) coupling agent, a organosilicon compound which is at least bifunctional and can be grafted on to the elastomer by means of a sulfur group having a polythiosulfenamide function, of formula: ≡Si-A-Sx—NR1R2, (I) in which: A is a divalent bond group, whether straight-chain or branched, which makes it possible to join the polythiosulfenamide group to a silicon atom of the organosilicon compound; x is an integer or fractional number of from 2 to 4; R1 represents hydrogen or a monovalent hydrocarbon group; R2 represents a monovalent hydrocarbon group selected from among C3-C8 alkyls, whether straight-chain or branched, C5-C10 cycloalkyls, C6-C18 aryls and (C6-C18)aryl-(C1-C8)alkyls; R1 and R2 possibly forming together and with the nitrogen atom to which they are bonded a single hydrocarbon ring. Tires and tire treads comprising a composition of this type.
摘要翻译:可用于制造轮胎的弹性体组合物,至少基于(i)二烯弹性体,(ii)作为增强填料的无机填料和(iii)作为(无机填料/二烯弹性体)偶联剂的有机硅化合物, 至少是双官能的,并且可以通过具有式:Si-A-Sx-NR 1 R 2,(I)的具有聚亚硫酰胺官能团的硫基接枝到弹性体上,其中:A是 无论是直链还是支链的二价键基团,这使得可以将多亚硫酰胺基团连接到有机硅化合物的硅原子; x是2到4的整数或小数; R 1表示氢或一价烃基; R 2表示选自C 3 -C 8烷基,无论是直链还是支链,C5-C10环烷基,C6-C18芳基和(C6-C18)芳基 - (C1-C8)烷基的一价烃基; R 1和R 2可以一起形成,并与它们所键合的氮原子形成单个烃环。 包括这种类型的组合物的轮胎和轮胎胎面。
摘要:
The invention relates to a photovoltaic coating containing a mixture of organic N-type (acceptor) and P-type (donor) semiconductor compounds, which makes it possible, when selecting the donor/acceptor pair, to modulate the semiconductor properties of the photovoltaic coating so as to enable the use thereof within a photovoltaic device, wherein one of the organic semiconductors includes a quinone core.
摘要:
The invention provides a method for preparing functionalized polyorganosiloxane resins (POS) comprising units M: (R3SiO1/2), Q: (SiO4/2) and M′: (YaR3-aSiO1/2) and optionally D: (R2SiO2/2) and/or D′: (RYSiO2/2) and T: (RSiO3/2) and/or T′: (YSiO3/2), wherein in said units R is C1-C10 alkyl or C8-C12 aryl and Y is a functional group (such as Si—H), by redistributing POS resins, using POSf bearing functional groups M′ and/or D′ and/or in the presence of an acid catalyst such as triflic acid or one of its derivatives and a non-basic inert filler: carbon black, diatomaceous earth, zeolite or acid or neutral oxide (Al2O3, Na2O, TiO2, MgO, silica). The invention also provides said catalyst system.
摘要翻译:本发明提供了一种制备官能化聚有机硅氧烷树脂(POS)的方法,所述聚有机硅氧烷树脂(POS)包含单元M:(R 3 SiO 2 1/2),Q:(SiO 4/2 )和M':(Y a a R 3-a SiO 1/2)和任选的D:(R SUB 和/或D':(RYSiO 2/2/2)和T:(RS 3 O 3/2/2) SUB)和/或T':(YSiO 3/2/2),其中在所述单元中R是C 1 -C 10烷基或 C 8 -C 12芳基,Y是官能团(如Si-H),通过重新分配POS树脂,使用具有POS的官能团M'和/或D 和/或在酸催化剂如三氟甲烷或其衍生物之一和非碱性惰性填料:碳黑,硅藻土,沸石或酸或中性氧化物(Al 2 O 3)存在下, O 3,Na 2 O,TiO 2,MgO,二氧化硅)。 本发明还提供了所述催化剂体系。
摘要:
The invention concerns the synthesis of silicone by anionic polymerisation of cyclic organosiloxane oligomers in the presence of a slightly nucleophilic strong base. The invention aims at providing novel strong base catalysts, more efficient in terms of solubility in the silicones, with hydrolysis stability strength and polymerising capacity. To achieve this, the invention provides for the use of ylides derived from aminophosphonium such as for example that of formula: [Me3N)3P—CHMe2]+, MeO or derived from phosphoranylidenes such as that of formula: [Me3P—HC=Pme3]+, t-BuO. The invention also concerns strong base catalysts as novel products.
摘要:
Chemically stable, perfluorinated, linear or cyclic polyorganosiloxanes (POS), and a process for the preparation thereof. Antifoams, agents for lowering surface tension, dirt repellents, antiadhesives, lubricants, oleophobic and/or hydrophobic agents, coatings and other compositions containing the perfluorinated POS are disclosed.
摘要:
Novel nonlinearly optically active polymers, well suited for electrooptical applications, are prepared by copolymerizing a first difunctional monomer with a second difunctional comonomer, with at least one of such difunctional monomers including a polar charge transfer moiety containing at least one electron acceptor group and at least one electron donor group (D), and further wherein the polymerizable functional groups are borne by the one or more electron donor groups (D).
摘要:
The present invention relates to new thiphene-related compounds of the general formula (I): ##STR1## in which: n is an integer between 1 and 10, advantageously between 1 and 4;A is an electron-acceptor group; and D is an electron-donor group.These compounds exhibit a high hyperpolarizability and an excellent photochemical stability and are employed especially in optical or electrooptical devices for their activity in nonlinear optics.
摘要:
Marterials which are active in nonlinear optics, having a repeating unit of the following formula I: ##STR1## in which R.sub.1 and R.sub.2, are either identical or different, and denote a linear or branched methylenic chain, preferably containing from 2 to 6 carbon atoms; R.sub.3 is an aliphatic, aromatic or arylaliphatic hydrocarbon radical; R.sub.4 and R.sub.5, which are identical or different, denote a nitrogen atom or a CH radical, or alternatively R.sub.4 and R.sub.5 are both carbon with the R.sub.4 -R.sub.5 bond being a double or a triple bond; and Z.sub.1 and Z.sub.2, which are identical or different, denote an aromatic group wherein Z.sub.1 optionally contains one or more substituents R.sub.7 and wherein Z.sub.2 optionally contains one or more substituents R.sub.7 in addition to group A, each substituent R.sub.7 may be lower alkyl, halogen, amido, amino, sulfoxide, hydroxyl radical, alkoxy and trifluoromethyl; and A denotes an electron-acceptor group, with Z.sub.2 having one or more groups A.
摘要:
Organometallic boron/nitrogen polymers, precursors of boron nitride, include recurring structural units of the formulae (I) and (II): ##STR1## wherein X is N-R.sup.3, Y is NR.sup.1 R.sup.2 and Z is N-R, in which R, R.sup.1, R.sup.2 and R.sup.3, which may be identical or different, are each a hydrogen atom, an optionally substituted hydrocarbon radical, or an organosilyl or hydrogenoorganosilyl radical and are prepared by reacting (a) at least one cyclic compound (compound A) containing recurring structural units of the formula (1): ##STR2## wherein A is a halogen atom and R is a hydrogen atom, an optionally substituted hydrocarbon radical, or an organosilyl or hydrogenoorganosilyl radical, with (b) at least one compound including at least one boron atom to which two halogen atoms are directly bonded (compound B), and (c) at least one compound containing at least one NH.sub.2 group compound C); the resulting organometallic polymers are facilely pyrolyzed into boron nitride ceramic materials.