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Spectroscopic characterization of the oligomeric surface structures on polyamide materials formed during accelerated
Boril S Chernev1, Gabriele C Eder
1Austrian Centre for Electron Microscopy and Nanoanalysis Graz and Research Institute for Electron Microscopy and Fine Structure Research, Graz University of Technology, Graz, Austria.
Applied Spectroscopy
|October 12, 2011
Summary
Accelerated aging caused crystalline deposits on polyamide 12. Analysis confirmed these were cyclic dimers and trimers of laurolactam, a monomer typically found in polyamide materials.
Area of Science:
- Polymer Science
- Materials Science
- Surface Chemistry
Background:
- Polyamide 12 (PA12) materials are susceptible to surface changes during aging.
- Understanding surface alterations is crucial for predicting material performance and longevity.
- Accelerated aging studies help simulate long-term material degradation under controlled conditions.
Purpose of the Study:
- To identify and characterize crystalline surface species formed on polyamide 12 after accelerated aging.
- To elucidate the chemical nature of these precipitations and their origin.
- To investigate the migration behavior of material components during aging.
Main Methods:
- Scanning Electron Microscopy (SEM) for initial detection of surface depositions.
- Fourier Transform Infrared (FT-IR) and Raman imaging microscopy for chemical analysis.
- Melting-point identification and mass spectroscopic analysis for definitive compound identification.
Main Results:
- Crystalline surface species were observed on polyamide 12 samples subjected to accelerated aging.
- Analysis identified these species primarily as the cyclic dimer and trimer of laurolactam.
- Methanol eluate analysis confirmed the chemical identity of the precipitated cyclic oligomers.
Conclusions:
- Accelerated aging induces the migration and crystallization of laurolactam cyclic oligomers to the surface of polyamide 12.
- The identified cyclic dimer and trimer are common components within polyamide materials.
- These findings provide insight into the aging mechanisms of polyamide 12 and potential surface degradation pathways.
