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

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Data

2018-04-01

Autores

Montagna, Larissa Stieven
Amaral Montanheiro, Thais Larissa do
Borges, Aline Chiodi [UNESP]
Koga-Ito, Cristiane Yumi [UNESP]
Lemes, Ana Paula
Rezende, Mirabel Cerqueira

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Editor

Inst Engineering Technology-iet

Resumo

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.

Descrição

Palavras-chave

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, graphite nanosheets, poly(hydroxybutyrate-co-hydroxyvalerate), solution casting, ultraviolet radiation, biodegradation assessment, thermal properties, roughness measurements, carbonyl index evaluation, Fourier transformed infrared spectroscopy, colonisation, morphological change, structural change, time 120 d, time 30 h, C

Como citar

Iet Nanobiotechnology. Hertford: Inst Engineering Technology-iet, v. 12, n. 3, p. 285-291, 2018.