摘要:
The application relates to methods for producing a polycarbonate resin having a narrowed molecular weight distribution, specifically, the application relates to the use of a redistribution catalyst and a feedback loop control mechanism to prepare narrow molecular weight distribution resin.
摘要:
Polycarbonate compositions are redistributed by melt equilibration using diethyldimethylammonium hydroxide as the redistribution catalyst. This catalyst affords an odorless polycarbonate product having a very low residual amine level.
摘要:
An optical data storage medium is provided. The optical data storage medium includes a polymer matrix; a reactant capable of undergoing a change upon triplet excitation, thereby causing a refractive index change; and a non-linear sensitizer capable of absorbing actinic radiation to cause upper triplet energy transfer to said reactant. The refractive index change capacity of the medium is at least about 0.005. The non-linear sensitizer comprises a triarylmethane dye.
摘要:
Optical data storage media for bit-wise recording of a microhologram using an incident radiation at a wavelength of about 405 nm are provided. The optical storage medium includes (a) a non-photopolymer polymer matrix; (b) a non-linear sensitizer comprising a phenylethynyl platinum complex, wherein the non-linear sensitizer is capable of triplet-triplet energy transfer from an upper triplet state (Tn) of the non-linear sensitizer to a lower triplet state (T1) of a reactant, wherein “n” is an integer greater than 1; and (c) a reactant capable of undergoing a chemical change upon the triplet-triplet energy transfer from the non-linear sensitizer, thereby causing a refractive index change in the medium to record the microhologram.
摘要:
A polymer composite prepared by melt blending, comprising an amorphous polymer; and a crystallizable polymer; wherein upon cooling the polymer composite, the amorphous polymer forms a continuous phase and the crystallizable polymer forms a dispersed phase, and wherein the dispersed phase is less than 200 nanometers in size.
摘要:
Monodentate gold ethynyl complexes having a gold-carbon bond and a gold-phosphorous bond, specifically, of formula I, may be useful in optoelectric devices, wherein Ar1 and Ar2 are independently monocyclic or polycyclic aryl, unsubstituted or substituted with one or more alkyl, alkenyl, alkoxy, aryl, aryloxy, fluoro, fluoroalkyl, or perfluoroalkyl; and R is substituted or unsubstituted aryl.
摘要:
The present invention relates to modular sterically enhanced emission dye (SEED) clusters, wherein multiple SEED molecules are appended to a single polymeric chain.
摘要:
A polyester block terpolymer comprising an amorphous block comprising a polystyrene dicarboxylate; a crystallizable block comprising a polyethylene glycol; and an aliphatic diol block; wherein the amorphous block is a continuous phase and the crystallizable block is a dispersed phase, and wherein the dispersed phase is less than about 200 nanometers in size.
摘要:
There are provided optical data storage media and methods of optical data storage using the same. The optical data storage media comprises a non-linear sensitizer capable of absorbing actinic radiation to cause upper triplet energy transfer to a reactant that undergoes change upon triplet excitation. The refractive index change (Δn) of the medium is at least about 0.005, or even at least about 0.05.
摘要:
A method for preparing a molded article includes the steps of (a) obtaining a polycarbonate resin and (b) molding the polycarbonate resin. The polycarbonate resin is made by a transesterification reaction using an activated diaryl carbonate such that the polycarbonate is susceptible to the formation of internal ester linkages (IEL). The method occurs with the proviso that the polycarbonate resin, the molding conditions or both are selected to control the amount of IEL formed during the molding process to a level of less than 0.4 mol %.