Journal
POLYMER TESTING
Volume 29, Issue 2, Pages 196-199Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2009.11.001
Keywords
Crosslinked PA-6; Gel content determination; Glass fabric; Dissolving; Formic acid
Funding
- Slovak Research and Development Agency [APVV-51-010405]
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Given the absence of a conventional determination method for polyamide-6 (PA-6) gels. the optimal conditions for gel content determination were investigated in crosslinked bulk PA-6 by dissolving the sample in 90% formic acid. The sample was wrapped in glass fabric and treated using three selected modes Based on statistical testing of the results, a two-step procedure consisting of slowly stirring the sample immersed in solvent at room temperature in an orbital shaker for 48 h followed by solvent exchange after 24 h was chosen for extraction of the uncrosslinked, soluble portion A correction was applied for the fraction of the glass fabric lubricant extractable by the solvent when calculating the crosslinked portion Gel content of similar to 70 wt % was determined. The relative standard deviation was less than 5%. (C) 2009 Elsevier Ltd All rights reserved.
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