七种降压类中药的红外光谱研究

选取七种具有降血压作用的中药材,以傅立叶变换红外光谱法研究其指纹图谱,分析这几种中药材红外谱图中相似的吸收峰的归属,通过比较,得出它们所含有的降压成分与2928、1645、1520、1455、1417、1150、1080、1025、851、770、668、567cm-1附近的吸收峰对应的某几个官能团有关。     

泥煤吸附镍前后的傅立叶变换红外光谱

在不同pH下泥煤多次吸附镍,用傅立叶变换红外光谱（FTIR）研究了泥煤与镍元素作用前后的光谱特征．结果表明,pH对泥煤的影响较大;泥煤的红外光谱与腐植酸相似;泥煤与镍元素结合后的红外光谱中归属于1711cm^-1的羧酸二聚体吸收峰减小甚至消失,同时归属于COO^-的1610cm^-1和1410cm^-1处的振动吸收增强,说明泥煤中的羧基与镍离子发生了配合作用,旦大部分是双齿结构．     

聚醚改性聚硅氧烷的傅立叶变换红外光谱表征

研究了聚醚改性聚硅氧烷的特征红外光谱,对主要的红外特征吸收带进行了归属。     

红外光谱样品制备中常见问题及解决办法

阐述了红外光谱制样中应注意的一些问题,对红外光谱制样中易出现的不正常现象进行了分析,并提出了相应的解决办法。     

漫反射傅立叶变换红外光谱法测定苏联纤维的主体结构

自红外光增产生以来,就被广泛地应用于高聚物材料的鉴定中,并取得了极大的成效.近年来,傅立叶变换红外光谱的广泛应用,以及各种反射附件的应用,使得高聚物材料的分析鉴定工作更加快速和全面.目前,纤维鉴定多采用显微镜及红外光谱法进行定性鉴定.用红外光谱法检验纤维的制样方法有两种:(1)破坏纤维外形的制样方法,如KBr压片、溶液铸膜、糊剂是浮、热压铸膜.冷压膜、热解和水解;(2)保留纤维外形的制样方法,如用各种反射元件及IR-PAS方法进行测定.其中第一种方法制样复杂费时,而第二种方法简单、快速、方便.     

傅立叶变换红外光谱法在纤维分析中的应用

本文综述了傅立叶变换红外光谱法在纤维分析中的应用与进展。内容涉及衰减全反射和漫反射傅立叶变换红外光谱法,傅立叶变换红外光声光谱法、显微傅立叶变换红外光谱法,傅立叶变换红外光谱仪与各种仪器的联用,以及计算机技术的应用与发展。     

聚醚醚酮的红外光谱研究

采用红外光谱研究了聚醚醚酮(PEEK)的分子结构。以C=O伸缩振动模式(ν_(C=O))为对象,采用变温红外光谱研究了PEEK的热稳定性。实验发现,在温度为293~393 K时,PEEK的νC=O对应的晶区及非晶区结构对温度比较敏感。进一步开展了PEEK的ν_(C=O)的二维红外光谱研究。结果表明,PEEK的ν_(C=O)对应的红外吸收频率包括:1 655 cm-1处的非晶区红外吸收模式(ν_(C=O-amorphpus))、1 652 cm~(-1)处的晶区红外吸收模式(ν_(C=O-crystal))、1 647 cm~(-1)处的中间态红外吸收模式(ν_(C=O-amorphpus/crystal))。随着测定温度的升高,PEEK的ν_(C=O)对应的红外吸收峰变化快慢顺序依次为ν_(C=O-crystal),ν_(C=O-amorphpus/crystal),ν_(C=O-amorphpus)。     

红外光谱研究酚醛树脂

本文用红外吸收光谱(IR)法研究了用不同催化剂研制的酚醛树脂结构,改性前后酚醛树脂结构,固化前后酚醛树脂结构变化,为合成耐碱酚醛树脂工艺提供有用的信息。     

傅里叶变换红外光谱在橡胶研究中的应用

综述了傅里变换红外光谱在橡胶的表征、化学反应及加工使用过程中的应用情况。     

Behavior of nonazeotropic compositions of a styrene–unsaturated polyester resin analyzed through FTIR spectroscopy and dynamic mechanical thermal analysis

Styrene is one of the comonomers most frequently used in the curing of unsaturated polyester resins. The use of nonazeotropic compositions leads to the formation of networks, in which the styrene–polyester ratio varies significantly during curing, as shown through FTIR spectroscopy. Dynamic mechanical thermal analysis (DMTA) showed how the variation in the styrene content affects the network structure that is formed. The results showed a decrease in network density in the systems in which the azeotropic composition was not used. The styrene content is therefore a factor that governs the curing process, in addition to the ultimate properties of the cured resins. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 3618–3625, 2003     

Determination of the formaldehyde‐to‐phenol molar ratios of resol resins by infrared spectroscopy and multivariate analysis

The formaldehyde/phenol (F/P) ratios of resol resins were successfully predicted by the recording of infrared (IR) spectra of both calibration and analyzed resins and by a multivariate analysis technique. In the creation of applicable models, the best correlating IR spectral areas were found between 1800 and 700 cm^?1. The positive effects of the increasing replicates and the omission of first‐derivative preprocessing on model quality were proven by systematic testing. The characteristic statistical parameters were acceptable when the resin was similar to the calibration resins. Although the calibration samples had narrow F/P molar ratios (2.00–2.40), or a particular urea content or alkalinity, the best calibration model could also successfully predict the F/P molar ratios of resins with greater F/P ratios, higher urea contents, and lower alkalinity. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 3582–3586, 2003     

4-氨基安替比林中杂质分离初步研究

研究了4-氨基安替比林中杂质分离方法。首先,利用4-氨基安替比林硫酸盐与其中多种杂质的理化性质的不同,确立了萃取方法及萃取剂;其次,利用正交实验方法,得到了最佳萃取工艺参数,从而将4-氨基安替比林与其中多种杂质进行了有效分离。本分离方法简便,适于工业化生产。     

Monitoring the grafting of epoxidized natural rubber by size‐exclusion chromatography coupled to FTIR spectroscopy

The evaluation of heterogeneous polymeric species by a selective, dual detector size‐exclusion chromatography setup can provide accurate results on the incorporation of specific functional groups in copolymers as a function of the molar mass distribution. However, when non‐UV‐absorbing species are used in copolymerization reactions, the dual detector method becomes less reliable. By interfacing a Fourier transform infrared (FTIR) spectrometer with size‐exclusion chromatography (SEC), the problem can be overcome, making it possible to map non‐UV‐absorbing species as a function of the molar mass distribution. Coupling takes place via a solvent‐evaporation stage, which delivers the mobile phase as a dry, solvent‐free polymeric film onto a germanium disk. In this article, styrene and methyl methacrylate were grafted onto epoxidized natural rubber (ENR50) and analyzed by SEC. The accuracy of FTIR as a suitable detector was evaluated by comparing results from a dual detector SEC setup and FTIR coupled to SEC. FTIR proved to be a successful detector for the analysis of non‐UV‐absorbing species. This was consequently followed by the characterization of methyl methacrylate‐grafted ENR50. From the relevant data, Gram–Schmidt and contour plots could be made to indicate the incorporation of methyl methacrylate into the grafted epoxidized natural rubber as a function of the molar mass distribution. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 2539–2549, 2003     

Tetrafunctional epoxy resins: Modeling the curing kinetics based on FTIR spectroscopy data

The curing kinetics of two thermosetting systems based on a tetrafunctional epoxy resin was investigated by Fourier transform infrared spectroscopy. Two formulations were studied, in which the hardener was an aromatic diamine and a carboxylic dianhydride, respectively. The quantitative evaluation of the epoxy conversion was based on spectra collected in the near‐infrared range (8000–4000 cm⁻¹) as well as in the medium infrared range (4000–400 cm⁻¹). The kinetic parameters evaluated in the above frequency intervals were significantly different. The reasons for such a discrepancy are discussed critically. Several kinetic models, based on the widely employed Kamal approach, were applied to verify their predictive capability. Satisfactory results were obtained for the amine‐cured system, particularly with a modified equation taking into account the autocatalytic nature of the process as well as a limiting diffusional effect. Less accurate results were achieved for the anhydride‐cured system. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 532–540, 1999     

新型酞菁前驱体的合成及工艺研究

以4-硝基邻苯二腈、四氟丙醇为主要原料合成制得了新型的酞菁前驱体4-(1,1,2,2-四氟丙氧基)邻苯二腈,并对其进行了红外表征,而且还探索了该实验条件,发现其最佳反应条件为55℃和38h。     

FTIR analysis of crosslinked cotton fabric using a ZnSe–universal attenuated total reflectance

Two cotton fabrics were treated with increasing amounts of a textile‐finishing agent (1,3‐dimethyl‐4,5‐dihydroxy‐2‐imidazolidinone) to impart durable press properties. The Universal Attenuated Total Reflectance Fourier Transform Infrared (UATR–FTIR) with a ZnSe–Diamond composite crystal was used to determine the amount of the crosslinking agent effectively linked to the cellulose after the required laundering cycles. Textile performance testing conducted on treated and untreated fabrics demonstrated the effectiveness of the treatment applied. The results obtained showed very good correlation between AATCC grading, automatic image analysis of fabric smoothness, textile performance testing, and the amount of finish as evaluated by the UATR–FTIR. The ZnSe–Diamond composite FTIR accessory was proven to be a fast and precise nondestructive technique to evaluate the amount of the crosslinking agent linked to the cellulose macromolecules. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 392–399, 2005     

FTIR、MASNMR和TG-DSC法研究分子筛表面接枝的硅烷基团

采用三甲基氯硅烷对介孔分子筛KIT-1进行了表面修饰。利用X射线粉末衍射(XRD)对样品进行了结构分析,用傅里叶变换红外光谱(FT IR)和核磁共振谱(MAS NMR)辅助热重-示差扫描量热(TG-DSC)法研究了硅烷基团在分子筛表面的情况。研究结果表明,表面修饰在保持分子筛介孔结构的同时,使硅烷基团成功接枝在分子筛孔道表面,热分析显示表面修饰样品失重6.14%,硅烷基团热分解时吸热577.9 J/g。     

FTIR法研究芳胺固化四溴双酚A环氧树脂反应动力学

用傅里叶变换红外光谱法研究了芳香二胺在恒温下固化四溴双酚A环氧树脂的固化反应动力学,得出了各固化反应的表观活化能。     

Ultraviolet photopolymerization induced by a triazine derivative

2‐(3,4‐Methdioxyphenyl)‐4,6‐bis(trichloromethyl)‐ 1,3,5‐triazine (MBTTR) was used as a photoinitiator for the polymerization of acrylate monomer. Ultraviolet–visible absorption spectroscopy was used to investigate the photochemical behavior during the photophysical process. The photopolymerization kinetics were monitored by real‐time Fourier transform infrared spectroscopy. The polymerization rates of the acrylates were significantly higher than those of the methacrylates. When MBTTR induced the polymerization of trimethylolpropane triacrylate, there was an optimum polymerization rate and the final conversion was obtained at 0.1 wt % MBTTR. MBTTR was an inefficient photoinitiator for ethyl vinyl. The final conversions of tripropylene glycol diacrylate induced by MBTTR and triazine/1,3‐benzodioxole were similar. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011