Viscosity improvement of recycled poly (ethylene terephthalate) from waste bottles by adding antioxidants and chain-extenderIsarankura Na Ayutthaya Siriorn, Bunyarak Munchumart, Boondeacha Natanicha, Sangrawee Nut, Markmee Nopparat and Haaian SuchartE3S Web Conf., 302 (2021) 02019DOI: https://doi.org/10.1051/e3sconf/202130202019