The effect of copolymer composition on the spatial structural hierarchy developed in injection molded bacterial poly(3-hydroxybutyrate-co-3-hydroxyvalerate) parts

Çakmak, Mükerrem; Ghanem, Maroun Abi; Yamamoto, Tadahiro

doi:10.1016/j.polymer.2005.02.071

Cited by 7 publications

(3 citation statements)

References 31 publications

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“…All the blends presented a thin layer of PHB skin at their surface (thickness of around 100 µm). This type of morphology is very well known for injected blends 21, 22. To characterize the rubber dispersion in the injected parts, SEM observations were carried out on surfaces obtained by cryo‐fracture.…”

Section: Resultsmentioning

confidence: 99%

Understanding the mechanical and biodegradation behaviour of poly(hydroxybutyrate)/rubber blends in relation to their morphology

Calvão¹,

Chenal²,

Gauthier³

et al. 2011

Polymer International

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In this work poly(hydroxybutyrate/poly(vinyl butyral)-co-(vinyl alcohol)-co(vinyl acetate) (or ethylene propylene diene monomer rubber) blends were prepared by conventional processing techniques (extrusion and injection moulding). A droplet type morphology was obtained for P(3HB)/PVB blends whereas P(3HB)/EPDM blends presented some extent of co-continuous morphology. In addition, rubbery domains were much smaller in the case of PVB. These differences in morphology are discussed taking into account solubility parameters and rheological behaviours of each component. For both blends, the increase of elastomer ratio led to a decrease of Young's modulus but an increase in elongation at break and impact strength. The latter increased more in the case of P(3HB)/EPDM blends although the rubbery domains were larger. These results are explained in the light of the glass transition of the rubber and the presence of plasticizer in the case of PVB. The addition of elastomer also resulted in an increase of P(3HB) biodegradation rate, especially in the case of EPDM. It is assumed that, in this case, the size and morphology of the rubbery domains induce a geometrical modification of the 'erosion front' which leads to an increase of the interface between P(3HB) phase and the degradation medium and consequently to an apparently faster biodegradation kinetics of PHB/rubber blends.

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Section: Resultsmentioning

confidence: 99%

Understanding the mechanical and biodegradation behaviour of poly(hydroxybutyrate)/rubber blends in relation to their morphology

Calvão¹,

Chenal²,

Gauthier³

et al. 2011

Polymer International

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show abstract

“…Other groups of researchers shape biomaterials by molding. Various molding techniques were developed to fabricate scaffold or implant for tissue engineering, such as injection molding (Cihlar and Tranec, 1996;Sousa et al, 2000;Gomes et al, 2001;Pishko, 2003;Sundback et al, 2003;Cakmak et al, 2005), compression molding (Bellare and Cohen, 1996;Witt et al, 2000;Wu et al, 2002;Hou et al, 2003;Katoh et al, 2004), melt molding (Oh et al, 2003), monomer transfer molding (Jiang et al, 2005), and the use of transparent silicone mold (Timmer et al, 2003) or RPfabricated mold (Chu et al, 2001;Chu et al, 2002;Bose et al, 2003;Sachlos et al, 2003;Chen et al, 2004;Lee et al, 2005). A summary on the molding of biomaterial is presented in Table I.…”

Section: Introductionmentioning

confidence: 99%

“…Injection molding involves high pressure and high temperature (Cihlar and Tranec, 1996;Sousa et al, 2000;Gomes et al, 2001;Pishko, 2003;Sundback et al, 2003;Cakmak et al, 2005). Tooling could be an issue if one wishes to produce internal microarchitecture.…”

Section: Introductionmentioning

confidence: 99%

Indirect fabrication of collagen scaffold based on inkjet printing technique

Yeong

Chua

Leong

et al. 2006

Rapid Prototyping Journal

105

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Purpose -This paper presents a new indirect scaffold fabrication method for soft tissue based on rapid prototyping (RP) technique and preliminary characterization for collagen scaffolds. Design/methodology/approach -This paper introduces the processing steps for indirect scaffold fabrication based on the inkjet printing technology. The scaffold morphology was characterized by scanning electron microscopy. The designs of the scaffolds are presented and discussed. Findings -Theoretical studies on the inkjet printing process are presented. Previous research showed that the availability of biomaterial that can be processed on a commercial RP system is very limited. This is due mainly to the unfavorable machine processing parameters such as high working temperature and restrictions on the form of raw material input. The process described in this paper overcomes these problems while retaining the strength of RP techniques. Technical challenges of the process are presented as well.Research limitations/implications -Harnessing the ability of RP techniques to control the internal morphology of the scaffold, it is possible to couple the design of the scaffold with controlled cell-culture condition to modulate the behavior of the cells. However, this is just initial work, further development will be needed. Practical implications -This method enables the designer to manipulate the scaffold at three different length scales, namely the macroscopic scale, intermediate scale and the cellular scale. Originality/value -The work presented in this paper focuses on important processing steps for indirect scaffold fabrication using thermal-sensitive natural biomaterial. A mathematical model is proposed to estimate the height of a printed line.

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A novel biodegradable nanocomposite based on poly (3-hydroxybutyrate-co-3-hydroxyhexanoate) and silylated kaolinite/silica core–shell nanoparticles

Zhang

Liu

Mark

et al. 2009

Applied Clay Science

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The effect of copolymer composition on the spatial structural hierarchy developed in injection molded bacterial poly(3-hydroxybutyrate-co-3-hydroxyvalerate) parts

Cited by 7 publications

References 31 publications

Understanding the mechanical and biodegradation behaviour of poly(hydroxybutyrate)/rubber blends in relation to their morphology

Understanding the mechanical and biodegradation behaviour of poly(hydroxybutyrate)/rubber blends in relation to their morphology

Indirect fabrication of collagen scaffold based on inkjet printing technique

A novel biodegradable nanocomposite based on poly (3-hydroxybutyrate-co-3-hydroxyhexanoate) and silylated kaolinite/silica core–shell nanoparticles

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