Korea Institute of Science and Technology

Albert Sung Soo Lee

Seung Sang Hwang

Jong Suk Lee

Soon Man Hong

Kyung Youl Baek

Chong Min Koo

Sunghwan Park

Seung Yong Lee

Sang Hee Park

Sanghyup Lee

Jong-Ku Park

Kyung-Youl Baek

So-Hye Cho

Sueng Sang Hwang

Young Yeol Jo

Disclosed is a self-healing polysilsesquioxane and a hybrid film using the same. Once crosslinked, the polysilsesquioxane copolymer can self-heal within several minutes at 100-120&#xb0; C. The self-healing polysilsesquioxane copolymer can be prepared into a hybrid material in the form of a film. Because the hybrid film has an excellent ability of self-healing the damage caused by external impact, it is applicable to wide applications such as gas separation membranes, etc., without limitation.

Self-healing polysilsesquioxanes and hybrid film using the same

Provided is a composition for use in fabricating a carbon molecular sieve membrane, including a fluorine-containing polymer matrix and polysilsesquioxane. The composition shows high selectivity to the gas to be separated and high separation quality by controlling the mixing ratio of the fluorine-containing polymer matrix with polysilsesquioxane as well as the type of fluorine-containing polymer matrix and polysilsesquioxane. Ancillary selective pore formation is enhanced by a so-called 'autogenous fluorinated gas induced siloxane etching' (A-FISE) mechanism of fluorine-containing polymer/polysilsesquioxane blend precursors during carbonization. Therefore, it is possible to effectively separate gases having a small difference in particle size, which, otherwise, are difficult to be separated with the conventional polymer membranes.

Carbon molecular sieve membranes based on fluorine-containing polymer/polysilsesquioxane blending precursors and method for fabricating the same

The present disclosure provides a gas separation membrane using a ladder-structured polysilsesquioxane in which organic functional groups are attached to a long siloxane chain and a method for fabricating the same. In accordance with the present disclosure, a free-standing ladder-structured polysilsesquioxane-based membrane with various functional groups can be fabricated for gas separations. The performance of the gas separation membrane can be controlled through a variety of combinations of the organic functional groups linked to the siloxane chain. In addition, by controlling the molecular structure of the gas separation membrane through mixing of the ladder-structured polysilsesquioxane with an amine compound or conventional glassy or rubbery polymers or through thermal/UV-curing, the permeability and selectivity of the gas separation membrane can be controlled selectively.

Gas separation membrane with ladder-structured polysilsesquioxane and method for fabricating the same

The present invention relates to a coating composition having excellent wavelength conversion efficiency and a wavelength converting thin film/sheet prepared using the same. The coating composition of the present disclosure includes 1 to 60 wt % of polyorgano-silsesquioxane, 0.0001 to 30.0 wt % of a wavelength converting agent, and a solvent, and exhibits a transmittance of 70% or more as compared to that of an aqueous solution. A wavelength converting thin film/sheet prepared by using the coating composition has not only excellent photoluminescence, thermal resistance, and light-fastness, but also moisture and oxygen permeability is low, and the visible light transmittance thereof is 70% or more as compared to that of the air, and when patterning is added, the photoluminescence intensity of sheet is at least two-fold higher than that of a non-patterned sheet. Therefore, the coating composition of the present invention may be conveniently used in the preparation of a wavelength converting thin film/sheet, and feasibly applied to the preparation of a solar cell in an efficient manner.

Coating compositions comprising polyorgano-silsesquioxane and a wavelength converting agent, and a wavelength converting sheet using the same

Provided is a mercapto-based polysilsesquioxane having a thiol group (&#x2014;SH) introduced to at least one side chain of polysilsesquioxane, represented by the following Chemical Formula 1 (In Chemical Formula 1, each of R, Rand Ris independently selected from the group consisting of a thiol aromatic group, thiol aliphatic group and organic functional group, wherein at least one of R, Rand Ris a thiol aromatic group or thiol aliphatic group, and n is an integer of 1-10,000). 

Mercapto-based polysilsesquioxane and method for preparing functional polysilsesquioxane using the same

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Seoul, South Korea

Albert Sung Soo Lee