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Fingerprinting of bottle-grade poly(ethylene terephthalate) via matrix-assisted laser desorption/ionization mass spectrometry |
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| Authors: | Wanderson Romão Marcos F Franco Gustavo B Sanvido Fabio C Gozzo Marcos N Eberlin |
| Institution: | a Laboratório de Polímeros e Reciclagem, Instituto de Química, Universidade Estadual de Campinas, UNICAMP, 13083-971, Campinas, SP, Brazil b Laboratório ThoMSom de Espectrometria de Massas, Instituto de Química, Universidade Estadual de Campinas, UNICAMP, 13083-971, Campinas, SP, Brazil c Laboratório de Proteomica, Instituto de Química, Universidade Estadual de Campinas, UNICAMP, 13083-971, Campinas, SP, Brazil d Laboratório de Quimiometria em Química Analítica, Instituto de Química, Universidade Estadual de Campinas, UNICAMP, 13083-971, Campinas, SP, Brazil |
| Abstract: | Matrix-assisted laser desorption ionization mass spectrometry (MALDI-MS) has been shown to provide a valuable technique to study the thermomechanical degradation of poly(ethylene terephthalate) (PET). MALDI-MS has been tested to monitor both the admixture of post-consumption bottle-grade PET (PETpc-btg) with virgin bottle-grade PET (PETv-btg) and the thermomechanical degradation effects on the chemical properties of PETv-btg. Principal component analysis of MALDI-MS data classify the samples into groups with specific features: a) PET-btg with intrinsic viscosities of 0.80 or 0.65-0.60 dL g−1); b) processed or virgin PET with the same intrinsic viscosity; c) PETv-btg from PET containing PETpc-btg; and d) PETv-btg from different manufacturers. MALDI-MS data is therefore able to reveal the quality of PET-btg resins preventing frauds and illegal use of recycled PET-btg. |
| Keywords: | Poly(ethylene terephthalate) Thermomechanical degradation MALDI-MS Recycling process Principal component analysis PCA |
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