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Tetsutarou Oishi,Shigeru Morita,Chunfeng Dong,Motoshi Goto,Erhui Wang,Xianli Huang 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.6
Space-resolved vacuum ultraviolet (VUV) spectroscopy using a 3-m normal incidence spectrometeris utilized to measure the impurity emission profile in the edge and divertor plasmas of theLarge Helical Device (LHD). It measures the vertical profile of VUV lines emitted in the wavelengthrange of 300 − 3200 °A. CII, CIII, CIV, and CV lines emitted from carbon ions are successfully measured,and their ion temperatures are derived from the Doppler broadening. Vertical profiles ofthe emission intensity and the ion temperature are measured simultaneously for the CIV line. Theemission intensity profile, which has several peak structures, is reasonably explained by consideringthe relation between the C3+ ion distribution and the geometry used for the observations.
Zhenhua Jiang,Xiujie Li,Shuling Zhang,Fugui Zhou,Jinhui Pang,Chunfeng Zhang,Dong Sun,Jianxin Mu,Guibin Wang 한국고분자학회 2011 Macromolecular Research Vol.19 No.5
Hyperbranched poly(ether ether ketone)s (HPEEKs) that were suitable as rheology control agents for linear poly(ether ether ketone)s (LPEEKs) were first prepared via commercially available hydroquinone (A2 monomer,HQ) and synthesized 3,4',5-trifluoro-benzophenone (BB'2 monomer, TF) effortlessly. The polymerization mode of A2 + BB'2 was demonstrated by MS. Moreover, FTIR, 1H NMR, 13C NMR, and 19F NMR spectroscopy revealed the structure and degree of branching (DB) of the resulting polymers. In comparison with A2 + B3 approach, HPEEK prepared using an A2 + BB'2 strategy possessed a higher molecular weight, and improved the melt processability of LPEEK. Remarkably, with the addition of HPEEK, the mechanical properties of LPEEK increased with a HPEEK content of 5%. The improved mechanical properties were attributed to the good miscibility. Moreover, the addition of HPEEK did not decrease the thermal stability of LPEEK.