摘要:
In accordance with one aspect a temperature regulating article comprises a substrate and a polymeric phase change material bound to the substrate, wherein the polymeric phase change material is characterized by including a precisely branched polymer with substantially equally spaced repeating sidechains. In other embodiments the polymeric phase change material includes between 20 and 200 branches per 1000 carbon units, has a latent heat of at least 5 Joules per gram, and a transition temperature between 0°C and 40°C.
摘要:
Provided are polymers which have high Tg's and main chains of fluorinated alicyclic structures containing functional groups in such high concentrations that the functional groups can sufficiently exhibit their characteristics, and processes for producing the polymers. Fluorine-containing polymers each comprising repeating units formed by cyclopolymerization of a fluorodiene of the general formula (1) having a functional group; and a process for producing the polymers by radical-polymerizing a fluorodiene of the general formula (1): (1) wherein R and R are each independently hydrogen, fluoro, alkyl having 3 or fewer carbon atoms, or fluoroalkyl having 3 or fewer carbon atoms; and Q is a divalent organic group having a functional group.
摘要:
Catalysts derived from the reaction of Cp*2ZrMe2 with B(C6F5)3 or [N,N-dimethylanilinium][B(C6F5)4] (denoted as [Cp*2ZrMe]+X-, Cp* = pentamethylcyclopentadienyl, X = B(C¿6?F5)4 or CH3B(C6F5)3) are active for the homopolymerization of functionalized dienes and alpha-olefins such as 4-TMSO-1,6-heptadiene (TMSO = trimethylsiloxy), 5-TBDMSO-1-pentene (TBDMSO = tert-butyldimethylsiloxy), 5-N,N-diisopropylamino-1-pentene, 5-diphenylphosphino-1-pentene and N-(1-penten-4-yl)carbazole. Other metallocene catalysts such as [rac-(EBTHI)ZrMe]?+X-¿ and [EBIZrMe¿2]?+X- (EBTHI = ethylene-1,2-bis(n5-4,5,6,7-tetrahydro-1-indenyl, EBI = ethylene-1,2-bis(1-indenyl)) are active polymerization catalysts for the polymerization of functionalized olefins although they are more easily poisoned by silyl ethers; [rac-(EBTHI)ZrMe]+X- catalysts polymerize 4-TBDMSO-1,6-heptadiene and 5-N,N-diisopropylamino-1-pentene. A variety of other silyl ethers were polymerized. Preliminary 13C NMR analyses of polymers obtained from the functionalized alpha-olefins with [(EBTHI)ZrMe]+X- catalysts are consistent with highly isotactic microstructures. Predominantly syndiotactic polymers are produced at -25 °C in the presence of [Cp*¿2?ZrMe]?+X-¿ catalysts which is consistent with chain end control. Treatment of the polysilylethers with HCl affords novel polyalcohols. Addition of HCl to poly(5-N,N-diisopropylamino-1-pentene) yields the corresponding polyelectrolyte. Metallocene/methylaluminoxane catalysts are active for the polymerization of alpha-olefins containing silyl ether groups.
摘要:
Homogeneous catalyst systems are provided for cyclopolymerization of diolefins, particularly 1,5-hexadiene, which control the stereochemistry, microstructure, and physical properties of the polymers synthesized. The systems comprise homogeneous Ziegler-Natta catalysts based on group 4 metallocenes and methylalumoxane. The cyclopolymers synthesized exhibit different degrees of stereoregularity, which is a function of the polymerization conditions. In addition, the polyolefins can be chiral and optically active. The polymers produced are of high molecular weight and highly flexible.
摘要:
Methods for separating an aromatic compound from a lube base stock are provided herein. The method includes contacting a lube base stock containing an aromatic compound with an organosilica material as provided herein.
摘要:
Methods for coating a substrate with a coating including an adsorbent material and a binder comprising an organosilica material which is a polymer comprising independent units of Formula [Z 3 Z 4 SiCH 2 ] 3 (I), wherein each Z 3 represents a hydroxyl group, a C 1 -C 4 alkoxy group or an oxygen atom bonded to a silicon atom of another unit or an active site on the substrate and each Z 4 represents a hydroxyl group, a C 1 -C 4 alkoxy group, a C 1 -C 4 alkyl group, an oxygen atom bonded to a silicon atom of another unit or an active site on the substrate are provided. Methods of gas separation are also provided.
摘要翻译:用包含吸附剂材料和粘合剂的涂层涂覆基材的方法包括有机硅材料,其为包含式[Z 3 Z 4 SiCH 2] 3(I)的独立单元的聚合物,其中每个Z 3表示羟基,C 1 -C 4烷氧基 或与基板上的另一单元或活性部位的硅原子键合的氧原子,各Z4表示羟基,C1-C4烷氧基,C1-C4烷基,与硅原子键合的氧原子 提供了衬底上的另一单元或活性位点。 还提供了气体分离方法。
摘要:
The polymerisation of material contained within and/or added to high temperature reactor produced carbon nanotube fibre wherein the contained material is crosslinked.
摘要:
The invention relates to a liquid crystalline polyolefin which can be produced industrially and inexpensively and is excellent in lightness in weight and processability. More particularly, the invention provides a liquid crystalline polyolefin having a specific structure and polymer compositions containing the polyolefin. A liquid crystalline polyolefin consisting of a random copolymer which comprises cis-(substituted methylene) -(substituted 1,3-cyclopentane) units represented by the general formula (1), trans-(substituted methylene) -(substituted 1,3-cyclopentane) units represented by the general formula (2), and (substituted methylene)-(substituted 4-alkene) units represented by the general formula (3) and which has a degree of cyclization of 90 % or above as defined by the formula: (x + y)/(x + y + z) and a content of trans structure of 70 % or above as defined by the formula: y/(x + y) wherein x, y and z are the number of units of the general formula (1), that of units of the general formula (2), and that of units of the general formula (3), respectively.