pressure reduced gradually from 760-5 mmHg over a period of 4-6 hours The structure of htC was confirmed by Ftir and H-NMR ,仪器表征 <各测试仪器型号、参数均根据具体实验而定,以下例子仅限于具体文献,不可照抄。> Nuclear Magnetic Resonance(NMR) Spectroscopy H-NMR spectra were recorded on a Bruker ARX-250 spectrometer at 250 MHz Fourier Transform-Infrared Spectroscopy(FTIR) A P-E 1720 FTIR spectrometer was used to obtain the spectra(16 scans, resolution 2 cm )of he monomer and polymers over the range from 4000 to 400 cm Differential Scanning Calorimetry(DSC) Differential Scanning Calorimetry(DSC) was carried out with a Perkin-Elmer DSC 7 thermal analyzer. All the samples were heated at 20C/min heating rate from 25C to 200C for th first scan, then cooled at 50-100C/min to 25C, and immediately heated a second time Peak melting temperatures(Tm)and melting enthalpy(AHm)were measured on the first scan, and glass transition temperatures (Tg) were measured on the second scan DSC was measured using a Perkin-Elmer DSC 7 calorimeter with heating and cooling rates of 0°C/ min from-20°Cto200°C Scanning Electron Microscopy(SEM) Fiber samples were fractured in liquid nitrogen to obtain tidy cross-section, and then sputter-coated with gold and visualized by SEM(PHILIPS XL 30) Samples were then covered by an ultrathin layer of gold and observed and micrographed with a scanning electron microscope(JSM 6400) X-ray Analysis Wide-angle X-ray scattering of a solution cast film aged for 2 weeks at 40C was performed using a Philips Vertical Diffractometer with Bragg-Brentano geometry and a graphite diffracted beam monochrometer at 40 k v/20 mA and Cu Ka radiation(1.5405 A). A scanning speed of 2/min with a sample interval of 0.05 was used Gel Permeation Chromatography(GPC) GPC analyses were carried out using a Waters HPLC pump with an ERMA 75 15A refractive index detector and a Carlo Erba UVis 20 ultraviolet detector Molecular weight data was obtained by gel permeation chromatography(GPC), using two PL el columns connected to a Water 410 RI detector(Waters Corp, MA)9 pressure reduced gradually from 760-5 mmHg over a period of 4-6 hours…. The structure of C HTC was confirmed by FTIR and 1 H-NMR. 二 仪器表征 <各测试仪器型号﹑参数均根据具体实验而定 以下例子仅限于具体文献 不可照抄 > Nuclear Magnetic Resonance (NMR) Spectroscopy 1 H-NMR spectra were recorded on a Bruker ARX-250 spectrometer at 250 MHz. Fourier Transform-Infrared Spectroscopy (FTIR) A P-E 1720 FTIR spectrometer was used to obtain the spectra (16 scans, resolution 2 cm-1) of the monomer and polymers over the range from 4000 to 400 cm-1. Differential Scanning Calorimetry (DSC) Differential Scanning Calorimetry (DSC) was carried out with a Perkin-Elmer DSC 7 thermal analyzer. All the samples were heated at 20 °C/min heating rate from 25 °C to 200 °C for the first scan, then cooled at 50-100 °C/min to 25 °C, and immediately heated a second time. Peak melting temperatures (Tm) and melting enthalpy ( Hm) were measured on the first scan, and glass transition temperatures (Tg) were measured on the second scan. DSC was measured using a Perkin-Elmer DSC 7 calorimeter with heating and cooling rates of 10 °C/min from -20 °C to 200 °C. Scanning Electron Microscopy (SEM) Fiber samples were fractured in liquid nitrogen to obtain tidy cross-section, and then sputter-coated with gold and visualized by SEM (PHILIPS XL 30). Samples were then covered by an ultrathin layer of gold and observed and micrographed with a scanning electron microscope (JSM 6400). X-ray Analysis Wide-angle X-ray scattering of a solution cast film aged for 2 weeks at 40 °C was performed using a Philips Vertical Diffractometer with Bragg-Brentano geometry and a graphite diffracted beam monochrometer at 40 kV/20 mA and Cu Ka radiation (1.5405 Å). A scanning speed of 2°/min with a sample interval of 0.05° was used. Gel Permeation Chromatography (GPC) GPC analyses were carried out using a Waters HPLC pump with an ERMA 7515A refractive index detector and a Carlo Erba UVIS 20 ultraviolet detector. Molecular weight data was obtained by gel permeation chromatography (GPC), using two PL gel columns connected to a Water 410 RI detector (Waters Corp, MA)