Sun Yat-Senuniversity

Kingfa Sci.&tech.co., Ltd.

Huawei Technologies Co., Limited

Kun Yan

Xianbo Huang

Nanbiao Ye

Min Cao

Huan Chang

Chuanhui Zhang

Feng Huang

Xu Ji

Mei Dong

Zhongquan Peng

The invention discloses a flame-retardant semi-aromatic polyamide derived from the following monomers: a diacid monomer A: where A1 is terephthalic acid or terephthalic acid and other diacid, terephthalic acid accounts for 50 to 100 mol % of A1, and A2 is [(6-oxido-6H-dibenzo-(c,e)(1,2)-oxaphosphorin-6-ketone)-methyl]-butanedioic acid, A1+A2=100 mol %, A1=90 to 99 mol %, A2=1 to 10 mol %; and diamine monomer B: one or more of diamine monomers containing 4 to 36 carbon atoms. In the present invention, by an in situ polymerization, a specific flame-retardant monomer [(6-oxido-6H-dibenzo-(c,e)(1,2)-oxaphosphorin-6-ketone)-methyl]-butanedioic acid is copolymerized in a semi-aromatic polyamide chain segment, excellent mechanical properties and low water absorption can be obtained.

Flame-retardant semi-aromatic polyamide and preparation method thereof

The present invention discloses a high-resistivity single crystal zinc oxide (ZnO) wafer and a high-resistivity single crystal ZnO-based radiation detector, and preparation method and use thereof. The preparation method of the high-resistivity single crystal zinc oxide wafer is to place a single crystal ZnO wafer in a metal lithium electrochemical device for a constant-current discharge treatment, and then to place the single crystal ZnO wafer in a high-pressure oxygen atmosphere at 800 to 1000&#xb0; C. and 10 to 30 atm for an annealing treatment for 20 to 28 hours. The preparation method of the radiation detector is to evaporate a metal electrode layer at both sides of the high-resistivity single crystal ZnO wafer, then to bond the wafer onto a circuit board, and to connect the wafer with the circuit board by a gold thread.

High-resistivity single crystal zinc oxide wafer based radiation detector and preparation method and use thereof

Growing community of inventors

Guangdong, China

Kun Yan