caa a22 4500 445385227 CHVBK 20180317143030.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s10924-011-0353-x doi (NATIONALLICENCE)springer-10.1007/s10924-011-0353-x Biodegradation of γ Irradiated Poly 3-hydroxybutyrate (PHB) Films Blended with Poly(Ethyleneglycol) [Elektronische Daten] [D. Parra, D. Rosa, J. Rezende, P. Ponce, A. Lugão] Poly(3-hydroxybutyrate) (PHB) was evaluated in blends with poly(ethyleneglycol) (PEG) of different weight average molecular weight (Mw=300, 600, 1,000 and 6,000). Irradiation of the PHB/PEG films was carried out to different levels of irradiation doses (5 and 10kGy) and the effects were investigated talking into consideration: thermal properties by differential scanning calorimetry (DSC), perforation resistance, water vapor transmission rate and biodegradation in simulated soil. The addition of plasticizer alters thermal stability and crystallinity of the blends. The improvement in perforation resistance due to irradiation was regarded to be a result of the crosslinking effect. Also, biodegradation assays resulted in mass retention improvements with increases in PEG molar masses, PEG concentration and irradiation dose. The irradiation process was shown to hamper the biodegradation mechanism. Springer Science+Business Media, LLC, 2011 Poly 3-hydroxybutyrate nationallicence Biodegradation nationallicence Physical-chemical properties nationallicence Gamma radiation nationallicence Crosslinking nationallicence Parra D. Chemical and Environmental Center (CQMA), Nuclear and Energetic Research Institute (IPEN), Av. Lineu Prestes, 2242, 05508-000, São Paulo, SP, Brazil aut Rosa D. ABC Federal University, CECS. Rua Catequese, 242, 09210-170, Santo André, SP, Brazil aut Rezende J. Chemical and Environmental Center (CQMA), Nuclear and Energetic Research Institute (IPEN), Av. Lineu Prestes, 2242, 05508-000, São Paulo, SP, Brazil aut Ponce P. Chemical and Environmental Center (CQMA), Nuclear and Energetic Research Institute (IPEN), Av. Lineu Prestes, 2242, 05508-000, São Paulo, SP, Brazil aut Lugão A. Chemical and Environmental Center (CQMA), Nuclear and Energetic Research Institute (IPEN), Av. Lineu Prestes, 2242, 05508-000, São Paulo, SP, Brazil aut Journal of Polymers and the Environment Springer US; http://www.springer-ny.com 19/4(2011-12-01), 918-925 1566-2543 19:4<918 2011 19 10924 https://doi.org/10.1007/s10924-011-0353-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10924-011-0353-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Parra D. Chemical and Environmental Center (CQMA), Nuclear and Energetic Research Institute (IPEN), Av. Lineu Prestes, 2242, 05508-000, São Paulo, SP, Brazil aut NATIONALLICENCE 700 1- Rosa D. ABC Federal University, CECS. Rua Catequese, 242, 09210-170, Santo André, SP, Brazil aut NATIONALLICENCE 700 1- Rezende J. Chemical and Environmental Center (CQMA), Nuclear and Energetic Research Institute (IPEN), Av. Lineu Prestes, 2242, 05508-000, São Paulo, SP, Brazil aut NATIONALLICENCE 700 1- Ponce P. Chemical and Environmental Center (CQMA), Nuclear and Energetic Research Institute (IPEN), Av. Lineu Prestes, 2242, 05508-000, São Paulo, SP, Brazil aut NATIONALLICENCE 700 1- Lugão A. Chemical and Environmental Center (CQMA), Nuclear and Energetic Research Institute (IPEN), Av. Lineu Prestes, 2242, 05508-000, São Paulo, SP, Brazil aut NATIONALLICENCE 773 0- Journal of Polymers and the Environment Springer US; http://www.springer-ny.com 19/4(2011-12-01), 918-925 1566-2543 19:4<918 2011 19 10924 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer