Influence of photodegradation with UV radiation in biotreatment with Paecilomyces variotti on PHBV/GNS nanocomposites

Influence of photodegradation with UV radiation in biotreatment with Paecilomyces variotti on PHBV/GNS nanocomposites

Author Montagna, Larissa Stieven Autor UNIFESP Google Scholar
Montanheiro, Thais Larissa do Amaral Autor UNIFESP Google Scholar
Borges, Aline Chiodi Google Scholar
Koga-Ito, Cristiane Yumi Google Scholar
Lemes, Ana Paula Autor UNIFESP Google Scholar
Rezende, Mirabel Cerqueira Autor UNIFESP Google Scholar
Abstract 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 30h 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.
Keywords ultraviolet radiation effects
nanocomposites
graphite
polymer blends
casting
nanofabrication
biodegradable materials
scanning electron microscopy
differential scanning calorimetry
contact angle
surface roughness
oxidation
Fourier transform infrared spectra
adhesion
photodegradation
biotreatment
Paecilomyces variotti
nanocomposites
graphite nanosheets
poly(hydroxybutyrate-co-hydroxyvalerate)
solution casting
ultraviolet radiation
biodegradation assessment
thermal properties
differential scanning calorimetry
scanning electron microscopy
contact angle
roughness measurements
oxidation
carbonyl index evaluation
Fourier transformed infrared spectroscopy
adhesion
colonisation
morphological change
structural change
time 120 d
time 30 h
C
xmlui.dri2xhtml.METS-1.0.item-coverage Hertford
Language English
Sponsor CNPq
FAPESP (Brazil)
CAPES/PVNS
Grant number CNPq: 158961/2014-5
CNPq: 303287/2013-6
Date 2018
Published in Iet Nanobiotechnology. Hertford, v. 12, n. 3, p. 285-291, 2018.
ISSN 1751-8741 (Sherpa/Romeo, impact factor)
Publisher Inst Engineering Technology-Iet
Extent 285-291
Origin http://dx.doi.org/10.1049/iet-nbt.2017.0020
Access rights Closed access
Type Article
Web of Science ID WOS:000427792000008
URI https://repositorio.unifesp.br/handle/11600/55654

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