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Effect of thermooxidative ageing on PET and PE microplastics
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This Croatian study examined how heat-induced thermooxidative aging changes the properties of PET and polyethylene microplastics. PET showed visible color changes and alterations in crystallinity and glass transition temperature after aging, while HDPE showed minimal changes, suggesting different stability under thermal stress.
Velik porast potražnje za plastičnim proizvodima u posljednjim desetljećima doveo je do znatnih razmjera onečišćenja okoliša plastikom. Različitim procesima starenja i mehaničke degradacije plastika se postupno usitnjava na sitnije dijelove (<5 mm) i nastaje mikroplastika koja se smatra jednim od prioritetnih onečišćivala današnjice. Mikroplastika negativno utječe na sve sastavnice okoliša, a može imati i znatne posljedice na ljudsko zdravlje. U ovom radu polimeri poli(etilen-tereftalat) (PET) i polietilen visoke gustoće (HDPE), toplinski su stareni u laboratorijskoj peći iznad temperature taljenja. Uzorci polimera potom su usitnjeni do veličine mikroplastike te karakterizirani pomoću infracrvenog spektrofotometra s Fourierovom transformacijom signala koji koristi metodu atenuirane totalne reflektometrije (ATR-FTIR) i diferencijalnog pretražnog kalorimetra (DSC). Kod HDPE-a nisu vidljive značajne promjene između nestarenih i starenih uzoraka, zbog nedovoljno visoke temperature zagrijavanja koja je potrebna za inicijaciju toplinske degradacije. U starenim uzorcima PET-a vidljive su promjene u boji te dolazi do pogoršanja pojedinih svojstava poput temperature taljenja (Tm), temperature staklastog prijelaza (Tg), postotka kristalnosti (χ), i tako dalje. Iako su u PET uzorcima neke promjene vidljive, svejedno temperatura pri kojoj smo starili materijal nije dovoljna za neke značajnije promjene.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.