Hanwha Chemical Corporation

Korea Electric Power Corporation

Dae Hak Kim

Jin Seo Lee

Seung Hoe Do

Do Kyoung Kim

Kyung Ho Kwon

Hye Yeon Lee

Kyoung Won Yim

Dae Hong Kim

Moo Sung Ryu

Dae Soo Lee

Gi Dae Oh

Kyoung Yul Kim

Sung Yun Hong

The present invention provides a method for producing a polyamide with controlled activator addition, and a polyamide produced thereby, the method allowing a polymerization conversion rate and a polydispersity index (PDI) to be enhanced by controlling the addition of an activator so as to prevent a gelation phenomenon that occurs during anionic polymerization.

Method for producing polyamide with controlled activator addition, and polyamide produced thereby

The present invention relates to a method for producing a polyamide by coordinated anionic ring-opening polymerization and a polyamide produced thereby, wherein metal alkoxide as an initiator and metal hydride as a catalyst are added to enable polymerization having a narrow molecular weight distribution and uniform molecular weight within a short polymerization reaction time at a low temperature, without a separate vacuum process, as compared with an existing polymerization method.

Method for producing polyamide by coordinated anionic ring-opening polymerization, and polyamide produced thereby

The present invention relates to a lightweight sandwich steel sheet using polyamide, and more particularly, to a lightweight sandwich steel sheet using polyamide and a manufacturing method therefor, the steel sheet being usable at a wider temperature range than that of a conventional sandwich steel sheet and, particularly, having excellent adhesion at a low temperature and remarkably increasing stability and lightweight property.

Lightweight sandwich steel sheet using polyamide, and manufacturing method therefor

The present invention relates to an instrument for measuring torsion moment per a single-pole cylindrical foundation, including: a force-applying means that applies horizontal force to structures protruding from the ground; a tension means that is connected with the force-applying means to apply tensile force to the structures; a measuring unit that is disposed inside the structures to measure strain per depth and portion due to force applied from the force-applying means and the tension means; and a controller that analyzes moment per depth of the structures from horizontal force measured by the measuring unit.

Instrument for torsion moment test of single-pole cylindrical foundation

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Seoul, South Korea

Dae Hak Kim