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Type: Artigo de periódico
Title: Ageing of Polyamide 11 Used in the Manufacture of Flexible Piping
Author: Romao, W
Castro, EVR
Filho, EAS
Guimaraes, RCL
Silva, ALN
Teixeira, SCS
de Paoli, MA
de Sena, GL
Abstract: The influence of temperature and pH on the ageing of piping made from polyamide 11 (PA-11) was studied using water from an oilfield (pH = 5.5) and deionized water (pH = 7.0) with monitoring by corrected inherent viscosity (CIV) measurements. The hydrolytic degradation was more extensive at high temperatures in oilfield water. When the system reaches equilibrium, the pH affects mainly the CIV plateau values. Thermogravimetry, energy-dispersive X-ray spectroscopy, differential scanning calorimetry, X-ray diffraction, and scanning electron microscopy measurements were also used to investigate aspects involved in the ageing PA-11. The hydrolytic degradation of PA-11 leads to formation of low molar mass compounds, such as oligomers dispersed in the polymeric matrix. This is a process that occurs preferentially in the amorphous domain of PA-11, which leads to an increase in the degree of crystallinity and the formation of a new gamma-phase. (C) 2009 Wiley Periodicals, Inc. J Appl Polyrn Sci 114: 1777-1783, 2009
Subject: ageing
Country: EUA
Editor: John Wiley & Sons Inc
Citation: Journal Of Applied Polymer Science. John Wiley & Sons Inc, v. 114, n. 3, n. 1777, n. 1783, 2009.
Rights: fechado
Identifier DOI: 10.1002/app.30793
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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