快速分析松脂澄清脂液中松节油含量的新方法

本文用统计方法研究思茅松松脂澄清脂液中松节油含量与酸值的相关关系，建立了不同于通常所用蒸馏法的新分析方法──酸值法。新方法快速、简捷、准确、经济、缩短分析时间５０分钟（７１％）；重复试验的极差的均值为０．１％，降低分析成本７０％；已用于云南省地方标准。     

Ionization constants for very weak organic acids in aqueous solution and apparent ionization constants for water in aqueous organic mixtures

A potentiometric method using a glass electrode has been applied to determination of apparent ionization constants for water in binary mixtures of water with tetrahydrofuran, methanol, 1,3-propanediol, glycerol, sucrose, and glucose at 25°C. Further calculations with these apparent ionization constants, which are now based explicitly on the previously implicit assumption that ionization of the organic component is negligible compared to ionization of water, permit evaluation of ionization constants for several very weak acids in purely aqueous solvent. Resulting pK values derived from this work and from our earlier work are as follows: glucose (12.38), sucrose (12.75 and 12.80), glycerol (14.05 and 14.07), ethylene glycol (14.44 and 14.52), methanol (15.2), 1,3-propanediol (14.8 and 15.0), 1-propanol (15.1), 2-propanol (15.7), and 2-methyl-2-propanol (15.0).     

L-抗坏血酸的红外光谱解析

对L－抗坏血酸的固体试样以及L－抗坏血酸在水、乙腈介质中的红外光谱进行了研究，发现介质对L－抗坏血酸的红外光谱影响很大，L－抗坏血酸分子中的γ－内酯羰基与羟基之间存在着分子内氢键和分子间氢键。文中对L－抗坏血酸的红外光谱进行了较详细的归属，认为H2A固体样品中的1754.9cm^-1,H2A水溶液样品的1758.1cm^-1均为H2A之参与分子内氢键的γ－内酯羰基伸缩振动峰；H2A固体样品中的1670.2cm^-1,H2A水溶液样品中的1691．3cm^-1均为H2A之参与分子间氢键的γ－内酯羰基伸缩振动峰。在非质子乙腈溶剂中，H2A浓度很稀时可出现－1809cm^-1游离态的内酯羰基峰。     

Tb1-xGdxA3(A=邻氨基苯甲酸,x=0-1)固体配合物的光谱分析和荧光增强

合成了一系列组成为Tb1-xGdxA3(A=邻氨基苯甲酸，x=0-1.0)的固体配合物。利用红外光谱和荧光光谱研究了配合物的结构和荧光性质。红外光谱的结果表明，掺表配合物的结构与未掺杂的邻氨基苯甲酸铽相似。荧光光谱的结果显示，Gd^3 对Tb^3 的发光有明显的增敏作用，并对荧光增敏的机理进行了探讨。     

赤霉低酸及其衍生物的13C-NMR研究

用JMOD和DEPT技术,并结合氘标记和进行一些化学反应,确定了赤霉低酸及其一些衍生物的¹³C-NMR谱中的所有¹³C峰归属。     

Thermal oxidative degradation of poly-lactic acid

The study of molecular weight and rate of change of molecular weight during thermal degradation of PLA suggests the random nature of chain scission with activation energy of 28 kcal/mol. The rate of weight loss indicates the formation of the volatiles by chain end initiation. The melting temperature of the polymer initially decreases and afterwards increases with increase in time of heating due to chain stiffening.     

Zur Kinetik der Isobutenhydratation in Schwefelsäure-Wasser—t-Butanollösungen

The reaction rate constants of the hydratization of isobutene in aqueous sulfuric acid—tert-butanol solutions can be correlated with theHammett acidity function. The activity energy depends on the concentration oftert-butanol. On the basis of the given correlation it is possible to extrapolate reaction rate constants beyond the kinetic regime of the isobutene hydratization.

     

Resistance in series model for micellar enhanced ultrafiltration of eosin dye

A study has been performed to quantify the extent of flux decline during micellar enhanced ultrafiltration (MEUF) of an acid dye (eosin red) using hexadecyl (cetyl) pyridinium chloride as the cationic surfactant. Effects of the operating conditions, e.g., transmembrane pressure drop and feed-surfactant-to-dye ratio, on the permeate flux profile and observed retention have been investigated in an unstirred batch ultrafiltration (UF) cell. A simple resistance-in-series model has been used to quantify the flux decline. From the flux decline history, it has been found that the membrane permeability decreases rapidly due to reversible pore blocking and further flux decline is caused by the growth of a gel-type layer over the membrane surface. The different resistances and growth kinetics of the gel layer have been investigated as functions of the operating conditions.     

新型稀土铕配合物的光致发光研究

以偶氮染料酸性黄与EuCl3反应合成了稀土元素铕(Ⅲ)的新型配合物,通过1H核磁共振谱、红外光谱、元素分析等分析手段,对其进行了表征.与其配体络合物酸性黄相比,它的荧光发光强度更强,发射为蓝光,在水中发光强度随浓度增大反而降低,在猝灭剂亚硝酸钠存在的情况下,荧光强度先降低后升高再降低,并出现峰分裂与红移.     

银纳米粒子上对硝基苯甲酸的催化还原

采用银纳米粒子为催化剂,研究了银纳米粒子对硝基苯甲酸还原的催化性能.结果表明,纳米尺度的银粒子在室温下可极大地加速对硝基苯甲酸的还原过程.其中,银纳米粒子被认为起着电子媒介体作用,即还原剂硼氢酸根优先将电子传递到银纳米粒子,继而吸附的对硝基苯甲酸获取电子发生还原.