NIR Polymer Library (660
spectra)
Nicodom offers unique
collection of NIR spectra of polymers.
(Related Link: for FTIR
spectral Library „Nicodom IR
Polymers All Package“ (digital searchable library available in all formats,
6701 spectra), click here.)
(Related link: for
digital searchable IS NIR Library
click here.)
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
Copyright © NICODOM 2006
NICODOM Ltd., Hlavni 2727, CZ-14100 Praha 4, Czech Republic, EU
Tel: +420-281914970, Fax: +420-281914971
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