Abstract:
Die Erfindung betrifft ein Verfahren zur Herstellung von lagerstabilen Polyurethan-Prepregs und daraus hergestellte Formkörper (Composite-Bauteile). Zur Herstellung der Prepregs bzw. Bauteile mischt man beispielsweise (Meth)acrylatmonomere, (Meth)acrylatpolymere, hydroxyfunktionalisierte (Meth)acrylatmonomere und/oder hydroxyfunktionalisierte (Meth)acrylatpolymere mit Uretdion-Materialien. Optional können noch Photoinitiatoren hinzugegeben werden. Diese Mischung oder Lösung wird nach bekannten Verfahren auf Fasermaterial, wie z.B. Carbonfasern, Glasfasern oder Polymerfasern aufgebracht und mit Hilfe von Strahlen oder Plasmaanwendungen polymerisiert. Nach Polymerisation, z.B. bei Raumtemperatur oder bei bis zu 80 °C, entstehen Thermoplaste bzw. thermoplastische Prepregs, die nachträglich noch verformt werden können. Die hydroxyfunktionalisierten (Meth)Acrylatbestandteile können anschließend mit den bereits im System vorhandenen Uretdionen durch erhöhte Temperatur vernetzt werden. Auf diese Weise können formstabile Duroplaste bzw. vernetzte Composite-Bauteile erzeugt werden.
Abstract:
The present invention relates to an olefin block copolymer having improved processability as well as excellent elasticity and heat resistance and a preparation method thereof. The olefin block copolymer comprises first and second segments which include an ethylene- or propylene-based repeating unit and an a-olefin-based repeating unit in a different molar fraction. In a TEM (transmission electron microscope) image, the olefin block copolymer is in a form where the second segment is dispersed on the first segment as a dispersed phase having a closed curve shape.
Abstract:
One step ortho-alkylation of anilines with styrenes to give chiral anilines is obtained using a strong acid catalyst, e.g. CF 3 SO 3 H. Condensation of the product to give ligand and metallation gives complex which catalyzes polymerization of propylene to give isotactic propylene or regiorandom propylene of low PDI or blocks thereof, depending on polymerization temperature.
Abstract translation:使用强酸催化剂,例如使用苯乙烯,苯乙烯,苯乙烯进行一步邻位烷基化得到手性苯胺。 CF 3 SUB> SO 3 SUB>小时。 产物给予配体和金属化的缩合得到复合物,其根据聚合温度,催化丙烯的聚合,得到低PDI或其嵌段的全同立构丙烯或异氰酸酯丙烯。
Abstract:
The present invention relates to a photoreactive polymer that comprises a multi-cyclic compound in a main chain, and a polymerization method thereof. Since the photoreactive polymer according to the present invention comprises a multi-cyclic compound having a high glass transition temperature as a main chain, the thermal stability is excellent, and since the mobility of the main chain is relatively high as compared to that of an additional polymer, a pho toreactive group can be freely moved in the main chain of the polymer. Accordingly, it is possible to overcome a slow photoreactive rate that is considered a disadvantage of a polymer material used to prepare an alignment film for known liquid crystal display devices.
Abstract:
Thermoplastic vulcanizates comprise at least an ethylene/a-olefin interpolymer and at least one thermoplastic polymer, such as polyolefin. The ethylene/a-olefin interpolymer is a block copolymer having at least a hard block and at least a soft block. The soft block comprises a higher amount of comonomers than the hard block. The block interpolymer has a number of unique characteristics disclosed here. The block interpolymer is either used as a compatibilizer between a vulcanizable elastomer and a thermoplastic polymer or as a vulcanizable elastomer when it is in the EPDM form. The thermoplastic vulcanizates can be profiled extruded to make profiles and gaskets.
Abstract:
Methods for modulated degenerative transfer living polymerization and isotactic-atactic stereoblock and stereogradient poly(olefins) thereby Abstract A method of producing a multiblock, stereoblock polyolefin having substantially uniform microstructure is disclosed. The method includes contacting a Ziegler-Natta pre-catalyst with a co-catalyst and an olefin to polymerize the olefin and form a first stereoblock, adding a methyl donator that changes the stereoregularity of the polymerization, and polymerizing the olefin to form a second stereoblock. The methods of the present invention allow for the production of poly(olefin)s having predictable degrees of incorporation of stereoerrors of a known type. The methods allows for the production of a variety of poly(olefin) microstructures, ranging from stereoblock to stereogradient poly(olefin)s and poly(olefin)s having fully isotactic to fully atactic microstructures.
Abstract:
A method of polymerizing a conjugated diene with an aromatic vinyl compound by block copolymerization, characterized by homopolymerizing the conjugated diene in the presence of a catalyst composition which comprises (A) a metallocene-form complex of a rare earth metal compound and (B) an ionic compound consisting of a non-coordinating anion and a cation and/or an aluminoxane and then adding the aromatic vinyl compound; and a catalyst composition for use in the polymerization of a conjugated diene or the copolymerization of a conjugated diene with an aromatic vinyl compound, which comprises (D) a neodymium complex and (B) an ionic compound consisting of a non-coordinating anion and a cation and/or an aluminoxane.
Abstract:
The invention relates to the production of homopolymers, co-copolymers or block copolymers from cycloolefinic monomer units characterized in that polymerization occurs in the presence of a catalyst of general formula (I), and optionally in the presence of an additive, wherein the substituents and indices have the following meaning: M is a metal from group VIII B of the periodic table of elements; E1, E2 are independently from each other an element from group V A of the periodic table of elements; Z is a bridging structural unit; Ar stands for annelated aryl units independent of each other; L1, L2 stands for formally uncharged Lewis base ligands; X means monovalent or bivalent anions; k means 1 or 2; l, m, n represent 1 or 2, whereby m x n = 1.
Abstract:
Block copolymers comprise a polyisobutylene rubbery soft segment of Mn of about 5,000 to about 500,000 and glassy hard segments of Mn of about 5,000 or higher and usually about 10,000 to 35,000 or more, are made by preparing a living polymer block of the polyisobutylene and then polymerizing on said living polyisobutylene block the glassy hard segments by adding thereto an electron donor having a donor number of 15 to 50 and then adding and polymerizing the monomers for the glassy hard segments. The monomers for the glassy hard segments are styrene and its derivatives and indene and its derivatives and mixtures thereof. The block copolymers are useful for making thermoplastic elastomer products and are also useful as molding compositions alone or with other polymers or modifiers of other polymers.