Hyphenated thermal analysis system allow a greater understanding of materials and processes. This talk from the John L Waters Symposium at PittCon 2015 discusses the history and current state of the techniques
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26th John L Waters Symposium - Hyphenated Techniques in Thermal Analysis
1. HUMAN HEALTH • ENVIRONMENTAL HEALTH
Hyphenated Thermal Analysis Techniques
March 8 2015
Kevin P Menard
PerkinElmer LAS
2. 2
Thermal as incomplete information
Water?
Oil? Organics?
Polymer burns?
Carbon black to CO2?
Inorganic ash?
Structured carbon?
3. 3
What’s missing
Thermal Technique What we measure What’s missing Hyphenated Technique
DSC Changes in heat capacity and
enthalpy
Chemical or structural
information associated with
changes
NIR, Raman, MS
TGA or STA Loss of weight on heating What comes off in a weight loss FTIR, MS, GC, GCMS, IR-GCMS,
ICP-MS,
TMA Size changes on heating Structural changes associated
with size changes
NIR, Raman, UV
DMA Stiffness changes with heating,
Frequency, and Strain
Structural or chemical changes
associated with measured
changes
NIR, Raman, UV, MS
4. 4
A quick history…
• 1960s – Use of TGA with MS
◦ Limitations imposed by the vacuum TGA could hold
◦ Gas were collected and manually transferred initially
• 1970s – Development of better systems
◦ Transfers lines improved, alterative direct TGMS system tried
◦ Other techniques still used “gas bomb”
• 1980s – Wendlandt listed TCD, GC and MS as coupled to TGA
◦ Development of FTIRs lead to TG-IR
• 1990s – Provder et al “Hyphenated Techniques in Thermal Analysis”
◦ Collected work to date
5. 5
Looking at Hyphenated techniques
• We could divide
them:
◦ Secondary
measure on the
sample
◦ Measurement of
evolved gas
from the sample
TMA/
DMA
Raman
NIR
UV
6. 6
Secondary Measurements on a Sample
1.0 50 100 150 184.7
-0.093
-0.08
-0.06
-0.04
-0.02
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.18
0.203
Index
PC1(75%)
xxxx
x
x
xx
x
x
x
x
x
x
x
x
x
x
x
x
x
xx
xxxxxxxxxxxxxxx
x
x
x
x
x
x
xx
xxxxx
x
xx
x
x
x
xx
x
xxx
xxxxxxxxxxxxxx
x
x
x
xxx
x
x
x
x
xx
x
x
x
x
x
x
x
x
x
xxxxxxxxx
x
xxx
xx
x
xxx
x
x
xx
xxx
xxxx
xxx
xx
xxx
xxxxxx
xxxx
xxxx
xxxxx
xxx
x
xx
xx
x
x
x
xx
Bad material Good material
Amorphous solid
Melt
Crystalline polymorph II
Crystalline polymorph III
100 150 20050
Heat flow
Temperature /oC
8. 8
Evolved Gas Analysis
• Probably 75-85% of the
hyphenated techniques
• To quote a colleague at DuPont:
“TGA on its own is of limited utility”
• What comes when off helps define
what is happening.
Water?
Oil? Organics?
Polymer
burns?
Carbon
black to
CO2?
9. 9
TG-IR TG-MS TG-GCMS TG-IR-GCMS
Functional group analysis
Limited to strong bands
Lots of Vapor Phase libraries
TG-IR are being to be made
Real time analysis
Qualitative
Sensitivity Limited
Difficulties in mixture analysis
Can be swamped by H2O or
and CO2
Non-destructive on vapor
Low cost option
Mass ions/Fragment analysis
Isotope analysis
Widely Applicable
Libraries Available but more
limited
Real Time Analysis
Quantitative
Highly Sensitive
High mass washover
AMU range concerns
Destructive
More expensive as AMU
range increases
Resolves overlapping events
Options for alternative
Detectors
Excellent GC libraries
Not real time
Quantitative & Qualitative
Extremely Sensitive
Columns can be O2 sensitive
Destructive
Complex to operate
Resolves overlapping events
IR allows real time analysis
Need both GCMS and IR
libraries
IR allows real time analysis
Mostly Qualitative at this time
Senstivitivity varies
Advantages and
Disadvantages of both
Destructive on vapor in GCMS
Very complex to operate
TG-IR
14. 14
TG-IR TG-MS TG-GCMS TG-IR-GCMS
Functional group analysis
Limited to strong bands
Lots of Vapor Phase libraries
TG-IR are being to be made
Real time analysis
Qualitative
Sensitivity Limited
Difficulties in mixture analysis
Can be swamped by H2O or
and CO2
Non-destructive on vapor
Low cost option
Mass ions/Fragment analysis
Isotope analysis
Widely Applicable
Libraries Available
Real Time Analysis
Quantitative
Highly Sensitive
High mass washover
AMU range concerns
Destructive
More expensive as AMU
range increases
Resolves overlapping events
Options for alternative
Detectors
Excellent GC libraries
Not real time
Quantitative & Qualitative
Extremely Sensitive
Columns can be O2 sensitive
Destructive
Complex to operate
Resolves overlapping events
IR allows real time analysis
Need both GCMS and IR
libraries
IR allows real time analysis
Mostly Qualitative at this time
Senstivitivity varies
Advantages and
Disadvantages of both
Destructive on vapor in GCMS
Very complex to operate
TG-MS
17. 17
TG-IR TG-MS TG-GCMS TG-IR-GCMS
Functional group analysis
Limited to strong bands
Lots of Vapor Phase libraries
TG-IR are being to be made
Real time analysis
Qualitative
Sensitivity Limited
Difficulties in mixture analysis
Can be swamped by H2O or
and CO2
Non-destructive on vapor
Low cost option
Mass ions/Fragment analysis
Isotope analysis
Widely Applicable
Libraries Available
Real Time Analysis
Quantitative
Highly Sensitive
High mass washover
AMU range concerns
Destructive
More expensive as AMU
range increases
Resolves overlapping events
Options for alternative
Detectors
Excellent GC libraries
Not real time
Quantitative & Qualitative
Extremely Sensitive
Columns can be O2 sensitive
Destructive
Complex to operate
Resolves overlapping events
IR allows real time analysis
Need both GCMS and IR
libraries
IR allows real time analysis
Mostly Qualitative at this time
Senstivitivity varies
Advantages and
Disadvantages of both
Destructive on vapor in GCMS
Very complex to operate
TG-GCMS
22. 22
TG-IR-GCMS
TG-IR TG-MS TG-GCMS TG-IR-GCMS
Functional group analysis
Limited to strong bands
Lots of Vapor Phase libraries
TG-IR are being to be made
Real time analysis
Qualitative
Sensitivity Limited
Difficulties in mixture analysis
Can be swamped by H2O or
and CO2
Non-destructive on vapor
Low cost option
Mass ions/Fragment analysis
Isotope analysis
Widely Applicable
Libraries Available
Real Time Analysis
Quantitative
Highly Sensitive
High mass washover
AMU range concerns
Destructive
More expensive as AMU
range increases
Resolves overlapping events
Options for alternative
Detectors
Excellent GC libraries
Not real time
Quantitative & Qualitative
Extremely Sensitive
Columns can be O2 sensitive
Destructive
Complex to operate
Resolves overlapping events
IR allows real time analysis
Need both GCMS and IR
libraries
IR allows real time analysis
Mostly Qualitative at this time
Senstivitivity varies
Advantages and
Disadvantages of both
Destructive on vapor in GCMS
Very complex to operate
25. 25
Thanks to:
• Veritas Testing & Consulting for the
TG-IR data on TPE
• Dr. J. Stansbury of U. Colorado
Dental School for UV-DMA-NIR
• PerkinElmer Staff:
◦ Ben Perston (Soil – Diesel)
◦ Tiffany Kang (Rubber)
◦ Richard Spragg (DSC-Raman)
◦ Maria Garavaglia (Dye)
◦ Bill Goodman (Coffee Beans)
• Some References:
◦ R. Schwenker Jr. and P. Garn,
Thermal Analysis, Academic Press,
1969
◦ W. Wendlandt, Thermal Analysis #rd
Edition, John Wiley & Sons, 1986
◦ T. Provder et al, Hyphenated
Techniques in Polymer
Characterization, ACS Symposium
Series 581, ACS Publishing, 1994
◦ W. Groenewund, Characterization
of Polymers by Thermal Analysis,
Elsevier Science, 2001.