摘要:
A family of new and novel molecules for mechanically superior two-dimensional (2D) polymers is described herein. By combining stiff carbon-containing cyclic polymer nodal units with more compliant linear polymer bridge units in an ordered, 2D repeating molecular structure it is possible to tailor the mechanical properties of 2D polymers and their assemblies to provide high stiffness, strength, and toughness. Furthermore, the inherent dimensionality of 2D polymers and their ability to be stacked into ordered and chemically interactive ensembles gives them inherent benefits in a variety of barrier and structural applications over current stiff and strong linear polymer technologies.
摘要:
A liquid crystal polyester resin for laminate, wherein, in a molecular weight distribution of an absolute molecular weight measured by a gel permeation chromatograph/light scattering method, an area fraction of a portion having an absolute molecular weight of 10,000 or less is 10 to 40%, and an area fraction of a portion having an absolute molecular weight of 50,000 or more is 3 to 20%, relative to 100% of the total peak area.
摘要:
A catalytic composition for preparing a polyethylene terephthalate (PET) resin is provided. The catalytic composition comprises a polycondensation catalyst and cesium tungsten oxide (CsxWO3-yCly), and 0
摘要:
The invention concerns a method for producing a polyester containing at least one 1,4:3,6-dianhydrohexitol unit comprising:·a step of introducing, into a reactor, monomers comprising at least one monomer (A) that is a diacid or a diester and at least one monomer (B) that is a 1,4:3,6-dianhydrohexitol;·a step of introducing, into the reactor, a catalytic system comprising either a catalyst comprising the element germanium and a catalyst comprising the element aluminum, or a catalyst comprising the elements germanium and aluminum, or a mixture of said two catalysts;·a step of polymerising said monomers to form the polyester;·a step of recovering a polyester composition comprising the polyester and the catalytic system. The invention also concerns a polyester composition containing a catalytic system comprising either a catalyst comprising the element germanium and a catalyst comprising the element aluminum, or a catalyst comprising the elements germanium and aluminum, or a mixture of said two catalysts, and the use of same to reduce the colouring of the polyester.
摘要:
The present invention relates to a polycyclohexylenedimethylene terephthalate (PCT) resin having enhanced crystallization speed and a method for preparing same. A PCT resin, according to an embodiment of the present invention, comprises: a reactant of (A) a dicarboxylic acid compound or a dicarboxylic acid ester compound and (B) a diol compound total of which 90 mol % or more is cyclohexanedimethanol; and 10-1000 ppm of antimony (Sb) atoms on the basis of the total weight of the resin, wherein the differential between the melting point (Tm) and a reduced crystallization temperature (Tmc) is 45° C. or lower. A PCT resin, according to the present invention, has high crystallization speed and thus enables fast production of various molded products. In particular, the PCT resin has high crystallization temperature and high heat resistance and thus enables fast production of a high-quality heat-resistant molded product by means of injection molding.
摘要:
An organic polymeric compound called a para-Furuta polymer is characterized by polarizability and resistivity has repeating units of a general structural formula: A backbone structure of the compound comprises structural unit P, on which are n Tail repeat units and m L-Q repeat units. P is selected from acrylate, methacrylate, polypropylene repeat units, polyethylene repeat units, siloxane, and polyethylene terephthalate repeat units. Tail repeat units are resistive substitutes that are oligomers of polymeric material. L-Q repeat units have j ionic functional groups Q connected to the structural unit P via a linker group L. The ionic functional groups Q comprise one or more ionic liquid ions, zwitterions, polymeric acids, or any combination thereof. Parameter t is the average number of repeating units of para-Furuta polymer. There are s are counter ions B which are molecules or oligomers that supply an opposite charge to balance a charge of the compound, s is number of the counter ions.
摘要:
An object of the present invention is to provide a lubricant having excellent lubrication performance. Further, another object of the present invention is to produce a polyester composition having a small load on an environment and mass productivity. The present invention relates to a production method for a complex polyester composition including a step of obtaining a complex polyester composition by condensing polyhydric alcohol, polycarboxylic acid having at least two carboxyl groups and carbon atoms of greater than or equal to 5, monohydric alcohol having at least one oxyalkylene group in the absence of a solvent, in which a component having a weight average molecular weight of less than or equal to 1300 in a GPC chart of the complex polyester composition is less than or equal to 43 area %. Further, the present invention relates to a complex polyester composition, a lubricant composition, and a lubricant.
摘要:
The present application relates to a method for manufacturing a printed matter, the method including: coating an ink layer on a substrate; and forming a printing pattern layer on the substrate by bringing a printing plate in contact with the ink layer to remove a portion other than a desired pattern from the ink layer. The manufacturing method of the present application is effective in reducing costs because the precision of the printing pattern is excellent and the manufacturing process is simple.
摘要:
A process for the continuous production of a biodegradable polyester, wherea mixture of aliphatic dihydroxy compounds, aliphatic and aromatic dicarboxylic acids or their liquid esters, and, optionally, further comonomers is mixed, without addition of a catalyst, to give a paste, and i) this mixture with at least a portion of the catalyst, is continuously esterified or, transesterified; ii) the transesterification or, esterification product obtained in i) is continuously precondensed with any remaining amount of catalyst to an intrinsic viscosity of from 20 to 70 cm3/g; iii) the product obtainable from ii) is continuously polycondensed to an intrinsic viscosity of from 60 to 170 cm3/g, and iv) the product obtainable from iii) is reacted continuously with a chain extender in a polyaddition reaction to an intrinsic viscosity of from 150 to 320 cm3/g. The invention further relates to biodegradable polyesters obtained_by this process.
摘要:
A polyester film has excellent resistance to hydrolysis, excellent heat resistance in high temperatures and low humidity, and mechanical strength. The polyester film satisfies a stress heat resistant coefficient f(125)≧3 and a wet thermo retention (=100×S(120)/S(0)) of 30% or more. f(125) is a value obtained by substituting t=125° C. in an approximation represented by f(t); t represents a temperature (° C.) at thermo processing; f(t) represents a stress heat resistant coefficient f at the thermo temperature t and represents an approximation to a straight line obtained by linear approximation by a least squares method of values plotted from a relationship between the thermo temperature t and a logarithm (log T(t)) of time T at which a rupture stress is 50% when t is 150° C., 160° C., 170° C., or 180° C.; T(t) is a time (hr) at which the maximum stress in a tensile test after thermo processing at t° C. and 0% RH is 50% of the maximum stress in a tensile test before thermo processing; S(120) is breaking elongation (%) after aging for 100 hours at 120° C. and 100% RH, and S(0) represents a breaking elongation (%) before aging.