Korea Research Institute of Chemical Technology

Sung Goo Lee

Kil Yeong Choi

Jae Heung Lee

Mi Hie Yi

Jae Hyun Lee

Seung Su Kim

Seung Soo Kim

Si Yong Song

Jong Il Weon

Jong Bae Lee

Provided is a method for quantitative evaluation of mar- and scratch-induced surface damage on polymeric and coating materials. The method for quantitative evaluation of scratch-induced damage on polymeric and coating materials includes: preparing a test specimen of polymeric and coating materials; inducing a scratch damage on the surface of the test specimen; representing the scratch damage formed on the test specimen as corresponding color coordinates; and calculating a quantitated scratch damage index from a combination of a load applied to the surface of the test specimen and the color coordinates corresponding to the scratch damage.

Quantitative evaluation of scratch-induced damages on polymeric and coating materials

Preparation of polyimide foam

A method of preparing polyimide foam produces a foam with excellent flexibility properties. The method of preparing polyimide foam is performed by foaming polyimide percursor which is prepared by employing linear aliphatic diamine and aromatic diamine containing 4 to 12 carbon atoms, at specific weight ration into the esterified reaction mixture prepared by reacting an aromatic carboxylic acid or its anhydride with excess amount of an alcohol compound. The polyimide foam produced by the method described retins superior characteristics of conventional polyimide foams and in addition have excellent flexibility so that it is used widely as adiabatic material, acoustical absorbent and cushion material in the aerospace industry, submarine and express trains etc.

Method of preparing polyimide foam with excellent flexibility properties

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Daejeon, South Korea

Sung Goo Lee