Home List of Titles Investigating the role of anionic surfactant and polymer morphology on the environmental stress cracking (ESC) of high-density polyethylene
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/198577
- Investigating the role of anionic surfactant and polymer morphology on the environmental stress cracking (ESC) of high-density polyethylene
- Ghanbari-Siahkali, Afshin; Kingshott, Peter; Breiby, Dag Werner; Arleth, Lise; Kjellander, Carina Koch; Almdal, Kristoffer
- The influence of a commercial grade and a pure anionic surfactant (dodecylbenzenesulfonic acid sodium salt, DBS) in aqueous solutions on the environmental stress cracking (ESC) of high-density polyethylene (HDPE) has been investigated. Injection moulded HDPE samples in “dog-bone” shape were exposed to the aqueous solutions of surfactant (0.14 M) at 80 °C under strain (var epsilon = 1.2%) for 5 days. Both the commercial and pure surfactants caused cracks under the experimental conditions. The change in surface chemistry of the HDPE was followed using attenuated total reflectance Fourier transform infrared (ATR-FTIR) and Raman spectroscopy. The thermogravimetric analysis (TGA) did not show any significant differences in thermal stability of the samples studied. Differential scanning calorimetry (DSC) analysis, however, revealed an increase in crystallinity of the exposed samples. Wide Angle X-ray Scattering (WAXS) indicated that the HDPE sample has a boundary of both preferred and random (isotropic) crystallite orientations close and far away from the injection moulding inlet, respectively. The structure of the surfactants in solution was investigated by light scattering (LS). This showed that the commercial grade surfactant forms large aggregates (e.g., 500 nm) both at room temperature and at the exposure temperature of 80 °C, whereas the pure surfactant has a critical micelle temperature (CMT) of around 45 °C. Below the CMT aggregates are formed, and above the CMT the surfactants are unimeric. Matrix-assisted laser desorption ionisation time-of-flight mass spectrometry (MALDI-TOF-MS) analysis revealed that the commercial surfactant has a wide distribution of hydrocarbon chains from C-10 to C-13, whereas the pure one contains predominantly hydrocarbon dodecyl (chain of C-12).
- Publication type
- Journal article
- Polymer Degradation and Stability, Vol. 89, no. 3 (Sep 2005), pp. 442-453
- Publication year
- FOR Code(s)
- 0303 Macromolecular and Materials Chemistry; 0904 Chemical Engineering; 0912 Materials Engineering
- CLSM; Cracks; Crystal orientation; Crystalline orientation; DBS; Degradation; ESC; Fourier transform infrared spectroscopy; HDPE; High density polyethylenes; Ionisation; Light scattering; Mass spectrometry; Negative ions; Raman; Sodium compounds; Solutions; Surface active agents; Surfactant; Thermodynamic stability; Thermogravimetric analysis; WAXS; X-ray scattering
- Publisher URL
- Copyright © 2005 Elsevier Ltd. All rights reserved.
- Peer reviewed