Industrial Technology Research Institute

3-o Lab Co. Ltd.

Jen-Luan Chen

Dar-Ming Chiang

Wen-Liang Liu

Chih-Yuan Chen

Mei-Rurng Tseng

Jong-Pyng Chen

Jonq-Min Liu

Lon-Cheng Cheng

Chih-Jer Shih

E-Hung Lu

An electrostatic electroacoustic transducer includes a first structure, a second structure and a third electrode. The third electrode is located between the first structure and the second structure. The first structure includes a first driving element, a first spacer and a first diaphragm, and the second structure includes a second driving element, a second spacer and a second diaphragm. By providing an alternating voltage source, a transformer and a bias voltage, the electrostatic electroacoustic transducer with a dual-diaphragm structure has a high efficiency and an enlarged range of audio frequency.

Electrostatic electroacoustic transducer and fabricating methods for the same

The present invention provides a fluorinated cyclic olefin electret film including a fluorinated cyclic olefin polymer film characterized by having a cyclic olefin polymer grafted with a fluorocarbon alkyl group, and a parylene film over the fluorinated cyclic olefin polymer film.

Fluorinated cyclic olefin electret film

The present invention provides a graft polymer and compositions comprising a cyclic olefin polymer characterized by having a glass transition temperature of about 60&#xb0; C. to 250&#xb0; C. and a molecular weight of about 400 to 300000, and a fluorocarbon alkyl group grafted on the cyclic olefin polymer.

Fluorinated cyclic olefinic graft polymer

The invention relates to the structures of proton exchange membranes with different molecular permeabilities, especially to the proton exchange membranes suitable for the applications in Direct Methanol Fuel Cell (DMFC) and with the function of recovering water from the cathode. The polymeric structures are the designs of phase separated structures of the crystalline phase and the amorphous phases, thereby limiting the swelling of the materials and the space of ionic cluster structures in nano-scale to reduce the permeability of methanol fuels On the other hand, by controlling of polymeric grafting reactions result in the reverse (from the cathode to the anode) permeability of the product water molecules on the cathode in the proton exchange materials greater than the permeability of methanol molecules in the fuels (from the anode to the cathode) due to the differences of fuel concentrations between the cathode and the anode of DMFC. Hence, it has the function of recovering water of the cathode and does not have the over-permeable phenomena as seen in methanol molecule.

Structures of the proton exchange membranes with different molecular permeabilities

An electret and composite formed therewith. The electret includes a polymer, copolymerizing from monomers including VdF as a first monomer and HFP, CTFE, TFE, or combinations thereof as a second monomer.

Growing community of inventors

Taipei, Taiwan

Jen-Luan Chen