Physical properties of poly(β-hydroxybutyrate)-poly(ε-caprolactone) blends

Gassner, Fred; Owen, A. J.

doi:10.1016/0032-3861(94)90258-5

Cited by 110 publications

(88 citation statements)

References 10 publications

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“…Despite this, its high production cost in comparison to commercial plastics, its high fragility due to high crystallinity, its relatively low melt viscosity as well as its thermal instability at moderate temperatures restrict its use [2,7]. With the aim of improving some of its properties PHB has been blended with several biodegradable polymers such as poly(lactic acid)-PLA [2,8], poly(pdioxanone)-PPD [5], poly(butylene succinate) (PBS) [9,10], poly(ethylene succinate) (PES) [11] or poly(caprolactone)-PCL [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Processing and characterization of binary poly(hydroxybutyrate) (PHB) and poly(caprolactone) (PCL) blends with improved impact properties

et al. 2016

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2 AbstractThe present work is focused on the development of binary blends from poly(hydroxybutyrate) (PHB) and poly(caprolactone) (PCL). Miscibility, mechanical and thermal properties as well as blends morphology are evaluated in terms of the blend composition. Binary PHB-PCL blends were manufactured by melt compounding in a twin screw co-rotating extruder and injection molded. Composition of PHB-PCL covered the full range between individual polymers at 25 wt% increments. The obtained results show that PCL acts as an impact modifier thus leading to an increase in flexibility and ductility as the PCL content on PHB-PCL blends increases with a noticeable increase in elongation at break and on

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Section: Introductionmentioning

confidence: 99%

Processing and characterization of binary poly(hydroxybutyrate) (PHB) and poly(caprolactone) (PCL) blends with improved impact properties

et al. 2016

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“…Bio-or petroleum-based polymers, for example, poly(lactide), 11 polysaccharides, 12,13 polyethyleneoxide, 14 poly(epichlorohydrin), 15 poly(vinylacetate), 16 poly(methylmethacrylate), 17 poly(e-caprolactone) (PCL) 18 and ethylene-propylene rubber, 19 have been blended with P(3HB) or P(3HB-co-3HV). The miscibility, morphology and mechanical properties have been studied, and some improvements in the mechanical properties of some blends have been reported.…”

Section: Introductionmentioning

confidence: 99%

“…18,[21][22][23][24] Interestingly, although most of them have concluded that this blend system is immiscible, 18,21-23 a result, which implies that this blend is miscible, has also been obtained. 24 These contradictory results may indicate a small amount of solubilization of one component in the other, although they seem to be immiscible on the bulk scale.…”

Section: Introductionmentioning

confidence: 99%

The toughening effect of a small amount of poly(ɛ-caprolactone) on the mechanical properties of the poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)/PCL blend

Katsumata

Saitō

Fang

et al. 2011

Polym J

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To improve the mechanical properties of bacterial poly(3-hydroxybutyrate) [P(3HB)] and poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) [P(3HB-co-3HH)], the materials were blended with poly(e-caprolactone) (PCL). The P(3HB-co-7 mol% 3HH) cast film and the P(3HB-co-11 mol% 3HH) melt-pressed film show brittleness after aging, although unaged samples show ductile behavior. However, the addition of a small amount of PCL was found to greatly improve the toughness of the P(3HB-co-7 mol% 3HH) cast film and the P(3HB-co-11 mol% 3HH) melt-pressed film. Reduction in the whitening of the elongated P(3HB-co-7 mol% 3HH) film by blending with PCL indicates that a transition in the deformation mechanism of the film was induced. In P(3HB-co-11 mol% 3HH)/PCL melt-pressed films, a cloud of craze initiation created by the dispersed PCL was observed. Differential scanning calorimetry thermograms and scanning electron microscopy images of the blended films indicated that finely dispersed PCL, the crystallization of which was restricted, and/or voids formed during preparation contribute to the delocalization of the applied stress and ductile deformation of P(3HB-co-3HH) films. In conclusion, the transition in the deformation mechanisms and the delocalization of the applied stress are expected to be important for enhancing the toughness of aged P(3HB-co-3HH)s, and blending with a small amount of PCL is a simple way to improve the mechanical properties of P(3HB-co-3HH)s. Polymer Journal (2011) 43, 484-492; doi:10.1038/pj.2011.12; published online 23 February 2011Keywords: blend; mechanical property; polyhydroxyalkanoate; poly(e-caprolactone); tensile test INTRODUCTION Several kinds of polyhydroxyalkanoates (PHAs) are biosynthesized by various bacteria as energy-storage materials. 1-5 They may be produced from renewable natural resources and have biodegradability. Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) [P(3HB-co-3HH)] is part of the PHA family. 6 Doi et al. 7 have found that the content of the 3HH unit greatly affected the thermal and mechanical properties of P(3HB-co-3HH), but had little effect on the crystalline structure of 3HB-rich P(3HB-co-3HH)s because of the formation of the P(3HB)-homopolymer-type crystalline phase and the exclusion of the 3HH unit from the crystalline lattice. P(3HB-co-3HH) was found to show improved mechanical properties and thermal plasticity over those of known PHAs. 8,9 One of the notable advantages of P(3HB-co-3HH)s is their adjustable mechanical properties, from soft to hard material, depending on the comonomer-unit composition; this allows for the tailoring of P(3HB-co-3HH) to various societal applications, such as in green and sustainable polymeric materials.However, P(3HB-co-3HH) becomes brittle after aging at room temperature, thus restricting its practical applications. Although

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“…Embora existam esforços consideráveis na investigação de vários aspectos de formulações para liberação in vitro de pesticidas, aplicações comerciais permanecem escassas, em função do alto custo de produção em comparação ao uso de granulados no solo [5] . Entre os materiais que podem ser empregados na microencapsulação, encontram-se os polímeros obtidos de fontes naturais como os polihidroxialcanoatos e os poliésteres sintéticos como as policaprolactonas [12,13] . Os polihidroxialcanoatos são poliésteres termoplásticos sintetizados por várias bactérias a partir de fontes renováveis [14] .…”

Section: Introductionunclassified

“…Assim, blendas com diferentes composições mostram cinéticas de degradação variadas baseados no grau de cristalinidade do polímero e no volume da área superficial [15,23] . As blendas de P(3HB)/PCL tem sido estudadas e descrita por diversos autores [13,18,24] . Os resultados têm demonstrado que é possível modular a degradação destas blendas variando a composição de polímeros.…”

Section: Introductionunclassified

Microencapsulação do pesticida cipermetrina em blendas de P(3HB/PCL): caracterização e ensaio de liberação in vitro

et al. 2016

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ResumoA aplicação de polímeros biodegradáveis para encapsular pesticidas é uma estratégia que permite, a partir de diferentes proporções entre os polímeros, modificar o perfil de liberação do agente. Este trabalho avaliou a liberação controlada do pesticida cipermetrina encapsulado em microesferas de blendas de P(3HB)/PCL (100/0, 0/100, 97/03, 95/05, 90/10, 80/20 e 70/30) obtidas pelo método de emulsificação-evaporação do solvente. As imagens de microscopia eletrônica de varredura revelam a forte influência da PCL na porosidade das microesferas. As análises de infravermelho mostraram a presença do pesticida em todas as composições de polímeros avaliadas. O ensaio de liberação de cipermetrina sugere que, no intervalo de 4 horas, o teor de cipermetrina liberada é dependente da composição das blendas utilizadas. As microesferas de PHB e blendas com menores teores de PCL, 97/03 e 95/05 liberaram 75% a 85% enquanto a composição 70/30 liberou 100% de cipermetrina. Palavras-chave: polímeros biodegradáveis, blendas, microencapsulação. AbstractThis work evaluated the controlled release of cypermethrin pesticide loaded in microspheres of P(3HB)/PCL blends obtained by emulsion-evaporation method. SEM analysis revealed a strong influence of PCL on the porosity of the microspheres. The infrared spectra showed the presence of pesticide in all polymer compositon evaluated. DSC curves showed that with higher content of PCL, decreased the crystallinity degree of polymers, resulting in a faster release of the pesticide. The release assay of cypermethrin suggests that within an interval of four hours the amount of pesticide released varies depending on the composition of the blends.

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Physical properties of poly(β-hydroxybutyrate)-poly(ε-caprolactone) blends

Cited by 110 publications

References 10 publications

Processing and characterization of binary poly(hydroxybutyrate) (PHB) and poly(caprolactone) (PCL) blends with improved impact properties

Processing and characterization of binary poly(hydroxybutyrate) (PHB) and poly(caprolactone) (PCL) blends with improved impact properties

The toughening effect of a small amount of poly(ɛ-caprolactone) on the mechanical properties of the poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)/PCL blend

Microencapsulação do pesticida cipermetrina em blendas de P(3HB/PCL): caracterização e ensaio de liberação in vitro

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