Structural Analysis of Biomer by Pyrolysis Mass Spectrometry and Thermogravimetry
Curie-point pyrolysis mass spectrometry (Py-MS) was used to identify the polymeric components of the poly(ether urethane urea) Biomer, which is widely used in the construction of artificial heart chambers. A comparative study between Biomer and model polymers showed Biomer to be composed of poly(tetramethylene glycol) (PTMG) capped with 4,4'-methylenebis(phenyl isocyanate) (MDI) and chain-extended with ethylenediamine (EDA). As determined from thermogravimetry (TG) and 1H NMR data the PTMG molecular weight appears to be approximately 1000 and the PTMG:MDI molar ratio 2:3. An overall pyrolysis mechanism is proposed which postulates initial scission of urea links followed by cleavage of the urethane bonds and subsequent decomposition of the polyether chains. © 1985, American Chemical Society. All rights reserved.
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Related Subject Headings
- Polymers
- 09 Engineering
- 03 Chemical Sciences
Citation
Published In
DOI
EISSN
ISSN
Publication Date
Volume
Issue
Start / End Page
Related Subject Headings
- Polymers
- 09 Engineering
- 03 Chemical Sciences