Abstract:
술폰화 폴리아릴렌에테르술폰, 말단에 티올기를 갖는 술폰화 화합물(sufonated compound) 및 말단에 알코올65기를 갖는 화합물 중에서 선택된 하나 이상의 반응 생성물을 포함하는 고분자, 이를 포함하는 연료전지용 전해질막 및 연료전지용 전극 및 이를 채용한 연료전지가 제시된다.
Abstract:
PURPOSE: An acrylic derivative of cardanol is provided to ensure excellent stability compared with conventional cardanol or derivatives thereof, and excellent polymer reactivity and polymerization. CONSTITUTION: A cardanol derivative is represented by chemical formula 2. In chemical formula 2, A is hydrogen or methyl, and R is represented by chemical formula 2-a. The cardanol is obtained from cashew nut shell liquid. A method for preparing the cardanol derivative comprises a step for reacting cardanol with glycidyl (meth)acrylate in the presence of a base catalyst and then purifying the resultant.
Abstract:
Proposed are a polymer represented by the following formula 1, a preparing method thereof, a composite membrane and an electrode including the same, and a fuel cell including the same. In formula 1, R_1-R_13 and Ar_1 are the same as described in detailed description.
Abstract:
The present invention relates to a technology for preventing the decline of signal delivery efficiency through a probe by controlling the impedance matching between a power amplifier and the probe by using the variability of an impedance variable circuit in an apparatus for thermotherapy when a thermotherapy is conducted. The apparatus for thermotherapy of probe type includes a power detector outputting DC voltages corresponding to electric energies of incident waves and reflected waves, which are separated from each other and output from a directional coupler; an arithmetic unit for calculating a reflection coefficient based on the DC voltages; and a control unit for controlling the impedance variable state of the impedance variable circuit to form impedance matching between the power amplifier and the probe.