Sun Yat-senuniversity

Kingfa Sci.&tech.co., Ltd.

Huawei Technologies Co., Limited

Kun Yan

Xiaoxiao Zheng

Zongjie Wang

Xueli Ma

Yongqiang Gao

Xianbo Huang

Hongwei Wang

Fangfu Guo

Dingzhang Dai

Nanbiao Ye

Qi Liu

Min Cao

Xiaoxia Wang

Zhen Zhou

Yi Zhang

Sujun Jiang

Chuanhui Zhang

Huan Chang

Mei Dong

Zhongquan Peng

Xu Ji

Feng Huang

Jingrong Zhang

Jiang Yu

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