2. ENVIRONMENTAL ChEMISTRy & TEChNOLOGy 2.1. Lectures

Chem. Listy, 102, s265–s1311 (2008) Environmental Chemistry & Technology
Fig. 2. Volatile degradaction products of polyurethane foam
sorbed on PDMS fibre
1: 2-methyl-1,3-dioxane, 2: 2,4-diisocyanatotoluene, 3: 6,10dimethyl-5,9-undecadiene-2-one,
4: 2,5-diterc-butyl-1,4-benzochinone,
5: pentadecane, 6: hexadecane, 7: 2,6-bis(1,1-dimethyethyl)-4-(1-oxopropyl)phenol,
8: 1-methylester dodecanoic
acid, 9: 4-decyl-morphline, 10: heptadecane, 11: 2,6,10,14-tetramethylpentadecane,
12: isopropylester tetradecanoic acid,
13: 4-undecyl-morpholine, 14: N,N-dimethyl-1-hexadecanamine,
15: 4-tetradecyl-morpholine, 16: squalene, 17: 4-hexadecyl-morpholine
Also nitrogen derivates were detected, namely line of
alkyl-substitued morpholines and n,n-dimethyl-1-hexadecanamine.
By the photolysis of hard segment of polyurethane foam
2,5-diterc-butyl-1,4-benzochinone, 2,6-bis(1,1-dimethyethyl)-4-(1-oxopropyl)phenol
and 2,4-diisocyanatotoluene
(2,4-TDI) were formed.
2,4-TDI is very volatile and toxic. The compound is
used as main reagent at synthesis of polyurethane. 2,4-TDI
was detected in case of all polymers modified by celulose
derivate fillers. It is difficult to say whether that compound is
photodegradation product of polyurethane foam or unreacted
raw material residue. It will be studied in the next research.
All the compounds were detected in most polyurethane
samples. There was observed qualitative change only.
Quantitative differences were found in the case of minority
distribution compounds. Their identification using library
search in nIST 05 was unsuccessful in most cases. Probably
small concentrations of analyte and resulting low-intensity
mass spectra could be the reason, or – due to specific character
of volatile compound made by irradiation of polyurethane
foam – their mass spectra are not included in this library.
PA fibre shows higher selectivity in comparison with
PDMS fibre which in opposite gives more complex information
about volatile compounds formed during photodegradation
of polyurethane.
s352
Fig. 3. Volatile degradaction products of polyurethane foam
sorbed on PA fibre
1: 2-(2-ethoxyethoxy)-ethanol, 2: 2-ethyl-hexanoic acid, 3: 1,3dioxane,
4: 2-methyl-1,3-dioxolane, 5: 2-methyl-1,3-diisocyanatobenzene,
6: 2,6-bis(1,1-dimethyethyl)-4-(1-oxopropyl)phenol,
7: 4-decyl-morpholine, 8:4-undecyl-morpholine, 9: N,N-dimethyl-1-hexadecanamine,
10: 4-tetradecyl-morpholine, 11: 4-hexadecyl-morpholine
Conclusions
In this study the SPME method was applied for the
identification of volatile compounds formed by irradiation
of polyurethane foams modified by biodegradable fillers. A
wide range of compounds was detected and most of them
were succesfully identified by library search. The identification
of the remaining compounds will be a subject of the next
research.
The finantial support from the project no.MSM
0021630501 from Ministry of Education, Youth and Sport of
the CR is greatly acknowledged.
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