The preferred method for this characterization uses benzyl alcohol at 130 C as an eluent. This first step will be conducted on samples of PA 6, PA 11 and PA 12, mainly commercial samples, covering a wide range of molecular weights. This second step will be dedicated to a deeper insight into SEC method using benzyl alcohol with the objective to fix particular parameters such as the nature of calibrants and the value of Mark-Houwink constants used in the method. The first round has been finished, and presently six participants have sent results. The scatter of results is large but not as bad as initially anticipated.
First round is finished and the publication is under preparation.
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