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| 1 | Investigation on the key factors in the hydrothermal synthesis of BN: The way of introducing sodium azide显示文摘The way of introducing sodium azide (NaN_3) into the reaction solution played an important role in the preparation of cBN by hydrothermal synthesis method. The results showed that both cBN content and crystalline perfection of the samples improved with increasing R_N value, and pure cBN could be obtained at 300℃ and 10 MPa when R_N increased to 3:1. Here R_N is defined as R_N =NaN_3(I)/NaN_3(II), wherNaN_3(I) denotes the amount of NaN_3 (in molar) that is added into the autoclave at the beginning of threaction process, and NaN_3(II) is the amount of NaN_3 (also in molar) introduced into the autoclave ahigh temperature and high pressure (i.e. 300℃ and 10 MPa). In order to explain the experimental results, a preliminary model was proposed in this paper. | LI Kai JIANG HaiHui LIAN Gang WANG QiLong ZHAO Xian CUI DeLiang TAO XuTang | 2007 | Chinese Science Bulletin2007，52，13： | 1 |
| 2 | Structural variation of melt-crystallized PTT during the heating process revealed by FTIR and SAXS显示文摘Time-resolved FTIR,WAXD/SAXS and DSC have been used to investigate the structural variation of non-isothermally crystallized poly(trimethylene terephthalate)(PTT) during the heating process.The three-phase model:the lamellar phase,the mobile amorphous phase(MAP) and the rigid amorphous phase(RAP) between lamellae is suggested to describe the structure of meltcrystallized PTT.According to FTIR results,the conformation of RAP in the constrained state is different from that of MAP.The increased content of amorphous phase in the temperature range from 120 to 192℃ is ascribed to the relaxation of RAP,rather than the melting of defective crystals.When the PTT is heated to a temperature above 192℃,the recrystallization/crystal perfection of original defective lamellae occurs without a pre-melting process,which leads to an increase in lamellar thickness and probably connects two adjacent lamellar stacks.This is responsible for an increase in crystallinity as well as a higher major melting temperature. | CHEN Zhen YAN ShouKe | 2013 | Chinese Science Bulletin2013，58，3： | 1 |
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