Samsung Sdi Co., Inc.

Engain Co., Ltd.

Won Mok Lee

Yeong Suk Choi

Tae Kyoung Kim

Young Gook Koh

Kyoung Ho Kim

Ha Been Park

Proposed are a contrast agent containing an iodinated unsaturated fatty acid ethyl ester derived from vegetable oil, a non-iodinated unsaturated fatty acid ethyl ester, and sulfur dioxide (SO), and a production method thereof. The contrast agent having a similar contrast effect is synthesized using vegetable oil as a substitute for poppy seed oil, which is unstable in terms of supply and is expensive. In addition, the long-term stability problem of an iodine-based contrast agent is solved by adding a non-iodinated unsaturated fatty acid ethyl ester and sulfur dioxide.

Vegetable oil-derived contrast agent with high stability and preparation method thereof

Provided are a polymer membrane that includes a porous polymer matrix and an acryl-based polymer infiltrated in pores of the porous polymer matrix, a method of preparing the same, and a fuel cell using the polymer membrane. The polymer membrane effectively decreases a crossover phenomenon of a fuel cell.

Polymer membrane, method of preparing the same, and fuel cell using the same

Growing community of inventors

Seoul, South Korea

Won Mok Lee