title: Examination of the chemical changes in cured phenol-formaldehyde resins during storage.
abstract: Chemical changes occurring within cured phenol-formaldehyde resins (resite and novolak type) during their storage were investigated by FT-NIR, py-GCMS and inverse gas chromatography. It was shown that a mixture of resite with novolak was less stable than resite or novolak itself as regards bulk properties. This aging phenomenon is mainly due to reaction of ammonia (product of hexa decomposition) with CH2OH groups present in resite. FT-NIR technique seems to be the least sensitive method for assessment chemical changes occurring during cured resins storage. Applications of py-GCMS and IGC method made able to indicate that more significant changes were for bulk samples (py-GCMS results) than on their surface (IGC results).
authors.affiliation: Poznan University of Technology, Institute of Chemical Technology and Engineering, Berdychowo 4, 60-965 Poznań, Poland. Electronic address: beata.strzemiecka@put.poznan.pl.
authors.forename: B
authors.initials: B
authors.lastname: Strzemiecka
authors.affiliation: Institute of Forensic Research, Westerplatte 9, 30-033 Kraków, Poland.
authors.forename: J
authors.initials: J
authors.lastname: Zięba-Palus
authors.affiliation: Poznan University of Technology, Institute of Chemical Technology and Engineering, Berdychowo 4, 60-965 Poznań, Poland.
authors.forename: A
authors.initials: A
authors.lastname: Voelkel
authors.affiliation: Jagiellonian University, Faculty of Chemistry, R. Ingardena 3, 30-060 Krakow, Poland.
authors.forename: T
authors.initials: T
authors.lastname: Lachowicz
authors.affiliation: Andre Abrasive Articles, Przemysłowa 10, 62-600 Koło, Poland.
authors.forename: E
authors.initials: E
authors.lastname: Socha
mesh_terms: D000641:Ammonia / Q000737:chemistry; D002849:Chromatography, Gas / Q000379:methods; D005557:Formaldehyde / Q000737:chemistry*; D005583:Fourier Analysis; D010636:Phenols / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D019265:Spectroscopy, Near-Infrared
chemical_list: D010636:Phenols; D011108:Polymers; D005557:Formaldehyde; D000641:Ammonia; C011529:phenol-formaldehyde resin
keywords: Aging; FT-NIR; Inverse gas chromatography; Phenol-formaldehyde resins; Py-GCMS