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用差示红外光谱法测定旧汽油机油中氧化值和硝化值 被引量:13
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作者 冯心凭 戴月菊 周毅 《石油与天然气化工》 CAS CSCD 北大核心 2002年第3期154-155,164,共3页
根据差示红外光谱法原理 ,测定并记录在用油和新油在 185 0~ 15 5 0cm- 1的红外光谱图 ,运用计算机进行差谱分析处理 ,在差谱图中读取 185 0cm- 1和 172 0cm- 1及 16 30cm- 1处的吸收值 ,再根据基线法分别求出旧油中的氧化值和硝化值... 根据差示红外光谱法原理 ,测定并记录在用油和新油在 185 0~ 15 5 0cm- 1的红外光谱图 ,运用计算机进行差谱分析处理 ,在差谱图中读取 185 0cm- 1和 172 0cm- 1及 16 30cm- 1处的吸收值 ,再根据基线法分别求出旧油中的氧化值和硝化值。试验结果表明 ,使用该分析方法所得的数据准确性高、重复性好。差示红外光谱法测定油品中氧化值。 展开更多
关键词 差示红外光谱法 测定 旧汽油机油 氧化值 硝化值 润滑油
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红外光谱-差示扫描量热法对聚烯烃共聚物中α-烯烃种类与含量的鉴别
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作者 张青 陈平 +1 位作者 谢小莉 曹贤武 《分析测试学报》 CAS CSCD 北大核心 2008年第7期725-728,共4页
利用傅立叶变换红外光谱(FTIR)研究了与不同α-烯烃共聚合的多种聚乙烯,并对共聚物的结构和类型进行了定性分析。由1 378、1 369 cm-1处的峰位置和峰强度判断聚烯烃的种类,由770、899、784 cm-1处的峰判断α-烯烃的种类。利用差示扫描量... 利用傅立叶变换红外光谱(FTIR)研究了与不同α-烯烃共聚合的多种聚乙烯,并对共聚物的结构和类型进行了定性分析。由1 378、1 369 cm-1处的峰位置和峰强度判断聚烯烃的种类,由770、899、784 cm-1处的峰判断α-烯烃的种类。利用差示扫描量热(DSC)热分级方法确定熔融峰的位置,并对共聚物中α-烯烃的含量进行了定量计算。 展开更多
关键词 红外光-扫描量热 聚烯烃共聚物 Α-烯烃 种类 含量
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Effect of a Novel Nucleating Agent on Isothermal Crystallization of Poly(L-lactic acid) 被引量:7
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作者 WEN Liang XIN Zhong 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2010年第6期899-904,共6页
The effect of a novel active nucleating agent(TBC8-eb) on the isothermal crystallization of poly(L-lactic acid) (PLLA) was studied by differential scanning calorimetry(DSC) and Fourier transform infrared spectroscopy(... The effect of a novel active nucleating agent(TBC8-eb) on the isothermal crystallization of poly(L-lactic acid) (PLLA) was studied by differential scanning calorimetry(DSC) and Fourier transform infrared spectroscopy(FTIR) . The analysis on kinetics demonstrates that TBC8-eb can not only accelerate the crystallization rate but also transform most of the original spherulite crystals of PLLA into sheaf-like crystals. Furthermore,the free energy of folding(σe) of PLLA and PLLA with TBC8-eb is 0.15 and 0.06 J·m-2,respectively,which suggests that the addition of TBC8-eb favors the regular folding of molecule chains in the crystallization of PLLA,improv-ing its crystallization rate. The FTIR results show that TBC8-eb can accelerate the conformational ordering of PLLA in the isothermal crystallization. The conformational ordering of PLLA nucleated with TBC8-eb begins with the interchain interaction of CH3,and then a short helix emerges where a couple of CH3 groups interact. 展开更多
关键词 CRYSTALLIZATION poly(L-lactic acid) nucleating agent
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Investigation on specific heat capacity and thermal behavior of sodium hydroxyethyl sulfonate 被引量:1
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作者 Hongying Hao Yadong Zhang Xiaoya Chen 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2017年第3期319-323,共5页
The thermal decomposition process was studied by the TG–DTA analyzer. The results show that the decomposition process of sodium hydroxyethyl sulfonate consisted of three stages: the mass loss for the first, the secon... The thermal decomposition process was studied by the TG–DTA analyzer. The results show that the decomposition process of sodium hydroxyethyl sulfonate consisted of three stages: the mass loss for the first, the second and third stages may be about the groups of CH_3CH_2OH, CH_3CHO and SO_2 volatilized, respectively. The decomposition residuum of three stages was analyzed by FT-IR, and the results of FT-IR agreed with the decomposition process predicted by theoretical weight loss. The specific heat capacity of sodium hydroxyethyl sulfonate was determined by differential scanning calorimetry(DSC). The melting temperature and melting enthalpy were obtained to be 465.41 K and 25.69 kJ·mol^(-1), respectively. The molar specific heat capacity of sodium hydroxyethyl sulfonate was determinated from 310.15 K to 365.15 K and expressed as a function of temperature. 展开更多
关键词 Sodium hydroxyethyl sulfonate Melting temperature Specific heat capacity Thermal decomposition
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Preparation and Characterization of Magnetic Resin Made from Chitosan and Cerium 被引量:1
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作者 YU Lina WANG Dongfeng +3 位作者 LI Haiyan LIU Bingjie WANG Xingyu XU Ying 《Journal of Ocean University of China》 SCIE CAS 2010年第2期185-192,共8页
In this study, the water-based ferromagnetic fluid and magnetic resin made from chitosan and cerium complex (MRCCC) were successfully prepared by using the chemical co-precipitation technique and by the reversed-pha... In this study, the water-based ferromagnetic fluid and magnetic resin made from chitosan and cerium complex (MRCCC) were successfully prepared by using the chemical co-precipitation technique and by the reversed-phase suspension cross-linking polymerization. MRCCC presented uniform and narrow panicle size distribution as determined by the Laser Panicles Sizer. The Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES), Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC) and X-ray powder diffraction (XRD) study demonstrated that there were iron and cerium existing in MRCCC. The movement of MRCCC under magnetic field proved its magnetic property. The swelling kinetics in water or solutions with different pH indicated that MRCCC could be applied in solutions with pH greater than 1.0. The ferromagnetic fluid particles were stable in MRCCC soaked in solutions with pH 〉2.0. In view of these results, MRCCC can be used as material for separation, clarification, adsorption, sustained release and hydrolysis activity. 展开更多
关键词 magnetic resin CHITOSAN CERIUM PREPARATION CHARACTERIZATION PROPERTIES
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