Open AccessInfluence of photodegradation with UV radiation in biotreatment with Paecilomyces variotti on PHBV /GNS nanocomposites
Author(s) -
Montagna Larissa Stieven,
Montanheiro Thaís Larissa do Amaral,
Borges Aline Chiodi,
KogaIto Cristiane Yumi,
Lemes Ana Paula,
Rezende Mirabel Cerqueira
Publication year - 2018
Publication title -
iet nanobiotechnology
Language(s) - English
Resource type - Journals
ISSN - 1751-875X
DOI - 10.1049/iet-nbt.2017.0020
Subject(s) - materials science , photodegradation , fourier transform infrared spectroscopy , nanocomposite , differential scanning calorimetry , contact angle , paecilomyces , composite material , scanning electron microscope , nuclear chemistry , chemical engineering , thermogravimetric analysis , chemistry , photocatalysis , organic chemistry , physics , botany , biology , engineering , thermodynamics , catalysis
Graphite nanosheets (GNSs) and poly(hydroxybutyrate‐ co ‐hydroxyvalerate) ( PHBV ) nanocomposites were prepared by solution casting method. This study aimed to evaluate the effects of previously phototreatment with ultraviolet (UV) radiation on the biotreatment with Paecilomyces variotti of neat PHBV and PHBV /GNS nanocomposites. Some samples of PHBV film were submitted only to biotreatment with P. variotti during 120 days; other samples were subjected to phototreatment (UV radiation) for 30 h followed by biodegradation assessment with P. variotti for a period of 120 days. The effects of biotreatments on thermal properties were studied through differential scanning calorimetry. The PHBV films were monitored by weight changes as a function of time. Also, their surfaces were examined after the tests using scanning electron microscopy, contact angle and roughness measurements. The level of oxidation was recorded by means of carbonyl index evaluation by Fourier transformed infrared spectroscopy spectroscopy. The phototreatment of PHBV films influenced the process of adhesion and colonisation by P. variotti on the surface of the films, and enhanced morphological and structural changes.