摘要:
The present invention relates to peroxide crosslinkable fluororubbers prepared from polymerized units of vinylidene fluoride, at least one fluorinated propene and/or a fluorinated methyl vinyl ether, at least one perfluoro(polyoxaalkyl vinyl ether), optionally tetrafluoroethylene and crosslinking-active reactive sites, to a process for the production thereof and to the use thereof.
摘要:
An inverted microscope (1) equipped with an ergotube (9) is disclosed. The ergotube (9) substantially comprises an eyepiece (9a) and a tube housing (9b). The microscope beam path (30) defined by the inverted microscope (1) is of U-shaped configuration. The U-shaped microscope beam path (30) is deflected into the eyepiece (9a) by a single deflection element (74) that is embodied as a pivotable mirror.
摘要:
Monomers of the formula (I) (for example, 3,3,4,4,5,5,6,6-octafluoromethylenecyclopentane) are described, as well as copolymers prepared from them and from one or more monomers copolymerizable with them. ##STR1## wherein n=3 to 5 The compounds are suitable for the production of a multiplicity of thermoplastically processable copolymers having various sets of properties which permit applications both as compact moulded parts and as coatings.
摘要:
The present invention relates to a polarization interference microscope (1) for imaging objects (5). The polarization interference microscope (1) comprises a light source (2), an illumination beam path (6), an imaging beam path (7) and an objective (4). The illumination beam path (6) extends from the light source (2) to the object (5). The imaging beam path (7) extends from the object (5) to a detector or a tube (3). At least one polarization means (9) is provided in the illumination beam path (6) and/or in the imaging beam path (7), by which at least one polarization means the light of the respective beam path (6, 7) can be converted into a predeterminable polarization state. An analyzer means (10) is provided in the imaging beam path (7). A birefringent component is provided between the polarization means (9) and the analyzer means (10), by which birefringent component the light polarized by the polarization means (9) can be divided into two partial beams (13, 14) having different polarization directions. The component can produce a splitting between the two partial beams (13, 14). The present invention furthermore relates to a retrofit kit for a conventional microscope and for a conventional polarization interference microscope, respectively, and a method for imaging objects. In order to enable variable contrasting of the interference contrast, the polarization interference microscope (1) according to the invention is characterized by the fact that the component has a liquid crystal element (11, 21, 23) formed in such a way that the value of the splitting between the two partial beams (13, 14) is settable in a variable manner thereby.
摘要:
A reactive and processable fluoropolymer, obtainable by mechanical shearing of a fluoropolymer A) comprising polymerized monomer units of at least one fluorinated, optionally substituted, alkene with 2 to 8 carbon atoms and optionally at least one member selected from the group consisting of a perfluorinated vinyl ether, non-fluorinated olefin and non-fluorinated vinyl ester, and 0.3 to 7% of a compound B) which possesses a double bond (I) capable of adding to polymeric radical fragments and a II-electron system which is either conjugated with double bond (I) or has readily transferrable hydrogen atoms in the allyl or benzyl position and optionally further double bonds or reactive groups and optionally further auxiliary agents (C). The fluoropolymer is especially useful in radical addition or nucleophilic or electrophilic substitution or addition, e.g. cross-linking or grafting.
摘要:
A 2-allyl-perfluoroalkyl-trifluorovinyl ether of the formula ##STR1## wherein R.sup.1.sub.F and R.sup.2.sub.F represent either --CF.sub.3 or, together, (CF.sub.2).sub.n where n=2 or 3.
摘要:
The present invention therefore provides a new process for the preparation of low-viscosity fluorinated rubbers, in which at least one fluorine monomer is polymerized by free radicals in the presence of one or more compounds of the formula (I) or (II) ##STR1## wherein R.sup.1 represents a fluorine atom or a perfluoroalkyl radical having 1 to 4 carbon atoms and R.sup.2 represents a perfluoroalkyl radical having 1 to 4 carbon atoms and n=4 or 5, and, optionally, a molecular weight regulator.
摘要:
The present invention relates to a new fluororubber, a process for its production and its use, as well as a process for producing fluororubber mouldings and/or coatings.