Lg Chem, Ltd

Hee Yong Park

Hye Sung Cho

Moo Ho Hong

Young Young Hwang

Hyong Min Bahn

Jung Jun Park

Won Jong Kwon

In Young Kim

Kwon Nam Sohn

Yeu Young Youn

Kil Sun Lee

Yu Ra Lee

Soo Young Kwak

The present invention relates to a novel dispersing agent capable of uniformly dispersing a variety of carbon-based materials in different media including aqueous solvents and a preparation method thereof, and a carbon-based material-dispersed composition including the same. The dispersing agent is a mixture of a plurality of polyaromatic hydrocarbon oxides, and the mixture includes polyaromatic hydrocarbon oxide having a molecular weight of 300 to 1000 in an amount of 60% by weight or more.

Dispersing agent, its preparation method and dispersed composition of carbon-based material comprising the same

The present invention provides a method for quantitative analysis of a compound in a sample characterized in that the quantitative analysis is performed by a method of using an external standard which obtains NMR spectra of a sample and a standard substance and then compares them, and it can be applied even to an insoluble sample.

Method for quantitative analysis

The present invention relates to a method for analyzing the length of sulfur crosslinking bonds in a vulcanized rubber using NMR spectrum. In some embodiments, the method comprises obtaining, independently, a carbon-13 nuclear magnetic resonance (C NMR) spectrum of a standard substance, wherein the standard substance containing carbon atoms, and aC NMR spectrum of the vulcanized rubber, wherein theC NMR spectrum of the standard substance and theC NMR spectrum of the vulcanized rubber are obtained under the same conditions; obtaining, independently, free induction decay (FID) amplification values of characteristic peaks in theC NMR spectrum of the standard substance, and FID amplification values of characteristic peaks in theC NMR spectrum of the vulcanized rubber; and measuring the length of sulfur crosslinking bonds in the vulcanized rubber.

Method for analyzing the length of sulfur crosslinking bonds in a vulcanized rubber

Disclosed is a copolycarbonate composition including: a copolycarbonate having an aromatic polycarbonate-based first repeating unit and one or more aromatic polycarbonate-based second repeating units having siloxane bonds; and a polycarbonate, where the copolycarbonate composition has an impact strength at room temperature of 830 to 1000 J/m as measured at 23 &#xb0; C. in accordance with ASTM D256 (&#x215b; inch, Notched Izod), where the one or more aromatic polycarbonate-based second repeating units having siloxane bonds include a repeating unit represented by Chemical Formula 2 and a repeating unit represented by Chemical Formula 3: and where the copolycarbonate composition satisfies the following Equation 1:1.0682&#xd7;+0.51&#x3c;&#x3c;1.0682&#xd7;+1.2.&#x2003;&#x2003;[Equation 1] The copolycarbonate composition provides an improved mobility.

Copolycarbonate resin composition

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Daejeon, South Korea

Hee Yong Park