Korea Research Institute of Chemical Technology

Sung Yeon Hwang

Jong Geon Jegal

Dong Yeop Oh

Jeyoung Park

Tae Ho Kim

Hyeon Yeol Jeon

Je Young Park

Si Gyeong Lee

Hyun Gil Cha

Seon Mi Kim

Seul A Park

Ho Jun Kim

Myung Suk Shin

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 polybutylene succinate (PBS) nanocomposite material includes a matrix comprising polybutylene succinate chains, and nanocelluloses dispersed between the polybutylene succinate chains. The PBS composite material may be produced by polymerizing 1,4-butanediol and succinic acid or a derivative thereof in a mixture of 1,4-butanediol and succinic acid or a derivative thereof with nanocelluloses. The PBS nanocomposite material and the method have improved properties, which does not require a surface hydrophobization pretreatment process of cellulose, melt kneading, and solution mixing processes.

PBS composite material and method for producing 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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Sung Yeon Hwang