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Type: Artigo de periódico
Title: Processing and Properties of Mixtures of PHB-V with Post-consumer LDPE
Author: Rosa, DS
Guedes, CGF
Oliveira, CM
Felisberti, MI
Abstract: Mixtures of poly-beta-(hydroxybutyrate-co-valerate) PHB-V with virgin and post-consumer low density polyethylene (LDPE) were prepared by melt mixing in proportions of 100/0, 90/10, 80/20, 70/30 and 0/100 (wt/wt%). The mixtures were analysed by infrared spectroscopy, differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), melting flow index (MFI), tensile tests, scanning electron microscopy (SEM) and biodegradation in simulated soil. The DMTA and DSC curves of post-consumer LDPE suggested that this polymer was a mixture of LDPE and linear low density polyethylene (LLDPE). Virgin and post-consumer LDPE had lower MFI than PHB-V, but the blends showed higher index as the content of LDPE increased. The addition of LDPE reduced the tensile strength and Young's modulus of the mixtures compared with PHB-V. SEM indicated poor interfacial adhesion between PHB-V and LDPE. PHB-V degraded slow and gradually, while both LDPE showed virtually no degradation under the conditions studied. The biodegradability of the blends depended on their composition and of the type of LDPE. LDPE improved the biodegradability of the mixtures.
Subject: Biodegradation
Low density polyethylene
Polymer blends
Country: EUA
Editor: Springer/plenum Publishers
Citation: Journal Of Polymers And The Environment. Springer/plenum Publishers, v. 16, n. 4, n. 230, n. 240, 2008.
Rights: fechado
Identifier DOI: 10.1007/s10924-008-0114-7
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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