Rapid quality checking of polyethylene water/gas-pipelines: a model based on pyrolysis-gas chromatography/mass spectrometry and discriminant analysis

An investigation into the catalytic cracking of LDPE using Py–GC/MS

“…Pyrolysis coupled with gas chromatographic separation and mass spectrometry detection (Py-GC/MS) is increasingly being employed in the analysis of complex substances including synthetic polymers [16][17][18]. This hyphenated technique, which allows direct chromatographic separation of the vapours evolved from the flash pyrolysis process, has been reportedly used in applications like identification of polymer additives [19][20][21]; evaluation of thermal stability and quality assurance [22,23]; study of degradation kinetics of polymeric materials [24,25] and evaluation of structural and chemical characteristics [26]. Some studies have also been conducted to study the catalytic effect of different additives, metal impurities and other components (basic zeolites, iron and cupper chlorides, carboxylates, carbon black, etc.)…”

Chemical analysis applied to the development of a model for the determination of quality of PE pipes

“…In each chromatogram, ␣-,-dienes, ␣-alkenes, and alkanes from 9 to 33 carbon atoms in the backbone were quantified and subjected to discriminant analysis using the software Statistica (Release 5.1) [15] according to the statistical method described in a previous work [14]. Briefly, the statistical method allowed the discrimination of PE samples in three main groups A, B and C where A represents pipes made of good quality PE and C those made of the worst material.…”

“…The results obtained by discriminant analysis, according to the previously set-up method [14] are shown in Fig. 2. 3.1.2.…”

“…In a previous work a fast method to predict the possible occurrence of molecular modification associated with resistance to mechanical stress and based on the statistical analysis of pyrolysis data was set up [14].…”