A new method for quantifying the intensity of the C=Cband of dimethacrylate dental monomers in their FTIR and Raman spectra
A new method for quantifying the intensity of the C=Cband of dimethacrylate dental monomers in their FTIR and Raman spectra
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DOI：
10.1016/j.biomaterials.2005.04.039
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发表时间：
2005-11-01
期刊：
影响因子：
14
通讯作者：
Zhu, XX
中科院分区：
文献类型：
--
作者：
Gauthier, MA;Stangel, I;Zhu, XX
牙科树脂的转化度 (DC) 或甲基丙烯酸酯通常通过光谱测量 1640cm(-1) 处乙烯基 (C = c) 伸缩带的减少量来确定，在聚合前后与 1609cm(-1) 附近的所有内标（芳香环象限伸缩振动 (Ph)）进行比值。虽然存在用于测量 FTIR 或拉曼光谱中 C = C 和 Ph 峰强度的标准方法，但这些方法要么在某些情况下失败，要么缺乏物理基础，纯粹基于光谱特征。在本研究中，我们提出了一种严格的方法（称为旋转异构法），用于从牙科单体混合物的 FTIR 和拉曼光谱中确定乙烯基和芳香族谱带的强度，并将其与标准基线法 (SBM) 和标准曲线拟合法进行比较。制备模型三甘醇二甲基丙烯酸酯 (TEGDMA)1:2,2-双(4-羟基苯基)丙烷(双酚-A) 和 TEGDMA 2,2-双(4-(2-羟基,-3-甲基丙烯酰氧基丙氧基)苯基)丙烷 (Bis-GMA) 混合物，具有一系列已知的 C = C Ph 摩尔比，以便 模拟固化效果。研究发现，测量 DC 的新方法的准确性与常用的 SBNL 一样好。标准曲线拟合方法被证明不适合通过 FTIR 光谱测量 C = C Pit 比率，因为它无法真实地模拟光谱特征。通过使用这种颈部方法获得的见解可能有助于表征其他甲基丙烯酸酯生物材料。 (c) 2005 Elsevier Ltd. 保留所有权利。
The degree of conversion (DC) or methacrylate dental resins is typically determined by spectroscopically Measuring the decrease of the vinyl (C = c) stretching band at 1640cm(-1), ratioed before and after polymerization to all internal standard (aromatic ring quadrant stretching vibration (Ph)) at around 1609cm(-1). While standard methods exist for measuring the intensity of the C = C and Ph peaks from the FTIR or Raman spectrum, these methods either fail under certain Circumstances, or lack a physical basis, being purely based on spectral features. In this study, we present a rigorous method (named rotational isomerism method) for determining the intensity of the vinyl and aromatic bands from the FTIR and Raman spectra of dental monomer mixtures, and compare it to a standard baseline method (SBM) and a standard curve fitting method. Model triethyleneglycol dimethacrylate (TEGDMA)1:2,2-bis(4-hydroxphenyl)propane (Bisphenol-A) and TEGDMA 2,2-bis(4-(2-hyroxy,-3-methacryloxypropoxy)phenyl)propane (Bis-GMA) mixtures with a series of known C = C Ph molar ratios were prepared in order to simulate the effect of curing. The accuracy of the new method for measuring the DC was found to be as good is the commonly used SBNL The standard curve fitting method was shown to be inappropriate for measuring C = C Pit ratios by FTIR spectroscopy due to its inability to realistically simulate the features of the spectra. The insight gained through the use of this neck method may be useful for the characterization of other methacrylate biomaterials. (c) 2005 Elsevier Ltd. All rights reserved.