Korea Research Institute of Chemical Technology

Jeyoung Park

Jong Geon Jegal

Sung Yeon Hwang

Dong Yeop Oh

Tae Ho Kim

Hyeon Yeol Jeon

Seon Mi Kim

Hyun Gil Cha

Seul A Park

Ho Jun Kim

Myung Suk Shin

Si Gyeong Lee

A method for preparing an aramid nanofiber dispersion includes dissolving an aromatic polyamide-based polymer in a solution including a basic material and an aprotic polar solvent, while performing stirring so that a nanofiber is produced, wherein the aromatic polyamide-based polymer is a polymer in a form of a solid which is not spun into a fiber form, the stirring is performed at a temperature of 50° C. or lower and at a speed of 10-1000 rpm so that a time taken for the aromatic polyamide-based polymer to be dissolved and formed into an aramid nano-fiber dispersion is 80 hours or less, an aramid nanofiber in the aramid nanofiber dispersion has an average diameter of 1 to 100 nm and an average length of 0.1 to 100 μm, and the basic material includes potassium hydroxide or sodium hydroxide.

Method for preparing aramid nanofiber dispersion

A biodegradable composite material which is produced by polymerizing a mixture of an aqueous dispersion of a natural polymer nanofiber including any one or more of a chitin nanofiber and a cellulose nanofiber, a dicarboxylic acid or a derivative thereof, and a diol. The biodegradable composite material has excellent biodegradable and mechanical properties.

Biodegradable composite material having improved mechanical properties using natural polymer nanofiber aqueous dispersion and method of producing the same

A self-restoring polyurethane-based polymer obtained by polymerization of a composition containing an aromatic disulfide diol represented by Chemical Formula, HO&#x2014;Ar&#x2014;S&#x2014;S&#x2014;Ar&#x2014;OH, an alicyclic polyisocyanate, and a polyol. Arand Areach are independently a substituted or unsubstituted C-Carylene group. The composition satisfies Equation, 0.1&#x2264;M/M. Mis a total mole number of the aromatic disulfide diol in the composition, and Mis a total mole number of the aromatic disulfide diol and the polyol in the composition.

Self-restoring polyurethane-based polymer and preparation method therefor

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Ulsan, South Korea

Jeyoung Park