Title: Fibre Labelling. Polytrimethylene terephthalate - PTT- DuPont. Intermediate Report
Publisher: Publications Office of the European Union
Publication Year: 2013
JRC N°: JRC78840
ISBN: 978-92-79-28309-3
ISSN: 1831-9424
Other Identifiers: EUR 25777 EN
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC78840
DOI: 10.2788/82737
Type: EUR - Scientific and Technical Research Reports
Abstract: In November 2011, the European Commission’s Joint Research Centre (JRC) was entrusted by DG Enterprise to verify the validity and applicability of the testing methods, proposed by DuPont, for the identification and quantification of their new fibre polytrimethylene terephthalate (PTT). The fibre is a type of polyester that differs from the common one polyethylene terephthalate (PET) as it contains one more methylene group in the aliphatic chain that links the terephthalic moiety. Experimental results confirmed that PTT can be identified using Fourier Transform Infrared Spectroscopy (FT-IR) and Differential Scanning Calorimetry (DSC). FT-IR is able to distinguish among the three types of polyester PTT, PET and polybutylene terephthalate (PBT), whereas DSC can differentiate only between PTT and PET on the basis of their melting points. For quantification purposes, the normal pre-treatment described in the EU Regulation 1007/2011, was proved to be applicable to PTT and its correction factor b for mass loss during pre-treatment was established (0 %). This means that the novel fibre is completely insoluble when the normal pre-treatment is applied. The agreed allowance of the new fibre (which represents its humidity regain) was measured (0.34 %). The European network of national experts on Textile Labelling (ENNETL) established the value of 1.50 % for PTT agreed allowance, for consistency with the already established values for polyester and elastomultiester. The solubility properties of PTT were evaluated with 15 methods described in EU Regulation 1007/2011, all of them with the exception of one (method 12). The new fibre was insoluble in methods 1-11, 13 and 16. The d correction factors were established on the basis of the experimental work carried out by the JRC. The resulting values were: • 1.00 for methods 1, 2, 3, 7 and 11; • 1.01 for methods 4, 5, 9 and 10; • 1.02 for method 13; • 1.03 for methods 6, 8 and 16. PTT was completely soluble in method 14, whereas it was partially soluble in method 15 that consequently cannot be used in the quantification of blends containing PTT. 2 For the quantification of PTT in binary mixtures, manual separation is an adequate technique, whenever applicable. The following chemical dissolution methods can also be used: 1-11, 13, 14 and 16. The quantification results of binary mixtures PTT/PET obtained by DSC method, using calibration curves built up with PTT and PET manually extracted from the sample under evaluation, were in very good agreement with the reference ones obtained through manual separation. In fact, the differences expressed in terms of bias were in all cases lower than 1%. In these conditions, the DSC method can be judged accurate. A consensus among the members of ENNETL was reached on the need to validate the new, if possible improved, DSC quantification method to be added to the Textile Regulation. Consequently, the JRC was entrusted to organise the validation exercise at European level according to ISO 5725:1994. The discussion concerning the name and the definition of this fibre would be held in the final ENNETL meeting, which will be organised in April-May 2013.
JRC Directorate:Institute for Health and Consumer Protection Historical Collection

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