NIR Polymer Library (660 spectra)
Nicodom offers unique collection of NIR spectra of polymers.
Nicodom NIR Polymer Library: NIR spectra (4.200- 11.000 cm-1) of polymers, monomers, plasticizers, lubricants, antidegradantes (antioxidantes, light stabilizers, PVC stabilizers), burning retarders, antistatic agents, blowing agents, coloring agents, pigments, optical whitenings, fillers and other related compounds. The spectra are printed in logarithmic scale (Log 1/R or absorbance). The spectra were collected by ThermoNicolet FTNIR spectrometers, the powders were collected in glass vials in reflectance mode, transparent liquids were collected in transmittance or with a transflectance mirror.
Download list of spectra for the NIR Polymer Library.
The NICODOM NIR Polymer Library consists of 660 near infrared spectra of polymers and related compounds. The source of the samples were local polymer manufacturers, research institutes and test laboratories.
The library was created to enable an easy identification of polymers and related compounds using Nicolet FT-NIR spectrometer and OMNIC Search software. This reference book was created to present the contents of the digital library and to enable to learn more about this type of spectra for users, who do not possess a NIR spectrometer yet.
Usual technique for the identity confirmation of polymer sample is IR or FT-IR spectroscopy (typical spectral range 4000 - 400 cm-1 or 2.5 - 25 microns). The FT-NIR spectroscopy (typical spectral range 11.000 - 4.000 cm-1 or 0.9 - 2.5 microns) shows several advantages compared to FT-IR. FT-NIR spectroscopy does not need any sample preparation, it allows to collect spectra of polymer blocks or granulates directly by placing them onto the window of transflectance fiber optics probe or diffuse reflectance accessory of the spectrometer within in a few seconds. Compared to FT-IR, FT-NIR allows to analyze more samples in the same time period. The influence of sample humidity on the spectrum quality is lower. However when the sample is contaminated or decomposed, FT-IR still gives more information about the sample composition (characteristic bands) compared to FT-NIR, where the spectrum is difficult to interpret. In those cases FT-NIR answers only the question, that the sample is different from the standard. The absorption bands in NIR spectral region have low absorption coefficients, thus when low concentration additives should be identified in a polymer, FT-IR is still the method of choice.
As the FT- NIR spectra of most collected substances offer high versatility, the library together with a FT-NIR spectrometer becomes an excellent tool for unambiguous identification of the sample. For the cases, where the spectra are too similar to each other, it is recommended to use more sophisticated algorithms like cluster analysis (Discriminant Analysis or Similarity Match when using Nicolet Turbo Quant or TQ Analyst software).
The spectra were collected using Nicolet FT-NIR spectrometer Avatar 360N or Protege 460 configured for spectral range 4.200 - 11.000 cm-1 (2.4 - 0.91 microns).
SabIR fiber optics transflectance sampling probe (fiber optics cables length was 1.5 m) with electronically cooled PbS detector (Protege) or Updrift accessory (standard InGaAs detector) were used for collection of solid samples, the spectra were collected at 64 scans, resolution 4 cm-1, CaF2 beamsplitter, Tungsten halogen source.
Liquid samples were collected by transmittance technique in instrument sample compartment in 0.2 mm quartz cell, 64 scans, resolution 4 cm-1, PbSe or In GaAs detector, CaF2 beamsplitter, Tungsten halogen source.
The 660 presented spectra were finally chosen from about 800 available spectra. The rest was excluded because the spectra did not have characteristic bands (most inorganic compounds), were not typical polymer related compounds, were doubled (under different names) or had low quality (gelatinous samples, dark samples).
The NIR spectra look different from MIR spectra, usually they have broad bands which do not correspond directly to a functional group of the studied molecule (overtones or combination bands). The baseline shape by lower wavenumbers (6.000 - 4.000 cm-1) is characteristic and reproducible for each compound (when it has similar crystalinity and particle size). The baseline slope by higher wavenumbers (11.000 - 9.000 cm-1) is characteristic for dark or color samples, while white samples usually do not show this feature. From this reason baseline correction was not applied in those cases.
For each presented sample several information are available.
„Name“ is the literature /1,2/ based name in most cases (when available) or other name commonly used by polymer chemists for the presented sample.
„Type of Material“ section shows the information about the compound type (Additive like Filling Agent, Lubricant, Softening Agent, Stabilizing Agent or Polymer like Block polymer, Copolymer, Mixture, Natural based, Polymer Alloy, Terpolymer).
„Abbreviation“ section includes the literature /1,2/ based abbreviation of the respective polymer (PES, PVC etc.)
„Commercial title“ brings the commercial non chemical name of the sample (Nylon, Buna etc.)
“Comment” includes the information about physical state of the sample (powder, chippings, granulated, fiber, block, liquid, dispersion, pearl, cloth, film, rope, foam, tube), color and further information like density (D), number average molecular weight (Mn), weight average molecular weight (Mw) or viscosity (V).
This library is available as printed book or scanned book (*.pdf file).
To download the list of spectra from this library, to download a free demo library compatible with your software, to check the format compatibility as well as for pricelist, ordering info and information about all NICODOM IR/NIR Libraries and other NICODOM products please visit our webpage.
NICODOM NIR Polymer Library, 660 NIR spectra of polymers
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