5-3 Specimen preparation 5.4 Applications.pdf

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Specimen preparation
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(a) Infrared spectroscopy
Examined in the solid state.
Some limitations on the form of sample:
 Relatively thin
 Low concentration when dispersed in a
transparent medium
 Solvent casting
 Hot pressing
 Film thickness is typically in the
range 1-50 m.
Because Solids have strong IR
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(a) Infrared spectroscopy
Quantitative
analysis:Solution (Beer-Lambert Law)
 Using several different solvents
 It is possible pensate for the
solvent absorptions by placing solvent in
the reference beam.
 In situ monitoring of polymerization
(using fibre optic accessories),
monitoring the properties of films during
their formation and the cure of thermoset
resins.
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(b) Raman spectroscopy
 Fewer Limitations;
 When colourless specimens are examined,
illumination using laser light in the
visible region is fairly
straightforward;
 Glass sample holder;
 Few restrictions on specimen size;
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(b) Raman spectroscopy
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Application to Materials
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Main applications
 Qualitative
 Quantitative
analysis of polymers and additives.
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Main applications
1) Polymerization processes
2) End group analysis for Mn
• Investigations mechanical of
deformation of polymers
• Chain conformations
• Stereochemical structure
• Crystallinity of polymer
• Orientation of polymer
※IR spectroscopy is the more readily available of the
techniques; However, Raman spectroscopy is gaining
popularity for in situ monitoring.
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(a)
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(a) Identification of polymers and
additives
Matrix
resin
Polymeric
materials
Additives
(stabilizers, fillers,
Plasticizers, etc.)
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(1)
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(1) Identification of addit