Preparation of poly(lactic acid) composites containing calcium carbonate (vaterite)

Kasuga, Toshihiro; Maeda, Hirotaka; Kato, Katsuhito; Nogami, Masayuki; Hata, Ken‐ichiro; Ueda, Minoru

doi:10.1016/s0142-9612(03)00190-x

Cited by 180 publications

(125 citation statements)

References 19 publications

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“…However, PLA has some disadvantages as well including sensitivity to water, fast physical ageing, limited impact resistance and large stiffness in some applications [2,3]. As a consequence, PLA is modified in many ways to develop materials with appropriate property profiles, among others by plasticization [4][5][6], impact modification [1, [7][8][9][10] and by the introduction of fillers [11][12][13][14][15][16] or fibers [17][18][19][20][21][22][23][24], especially for structural applications.…”

Section: Introductionmentioning

confidence: 99%

PLA/wood biocomposites: Improving composite strength by chemical treatment of the fibers

Csizmadia

Faludi

Renner

et al. 2013

Composites Part A: Applied Science and Manufacturing

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A resol type phenolic resin was prepared for the impregnation of wood particles used for the reinforcement of PLA. A preliminary study showed that the resin penetrates wood with rates depending on the concentration of the solution and on temperature.Treatment with a solution of 1 wt% resin resulted in a considerable increase of composite strength and decrease of water absorption. Composite strength improved as a result of increased inherent strength of the wood, but interfacial adhesion might be modified as well.When wood was treated with resin solutions of larger concentrations, the strength of the composites decreased, first slightly, then drastically to a very small value. A larger amount of resin results in a thick coating on wood with inferior mechanical properties. At large resin contents the mechanism of deformation changes; the thick coating breaks very easily leading to the catastrophic failure of the composites at very small loads.

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Section: Introductionmentioning

confidence: 99%

PLA/wood biocomposites: Improving composite strength by chemical treatment of the fibers

Csizmadia

Faludi

Renner

et al. 2013

Composites Part A: Applied Science and Manufacturing

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“…When numerous vaterite particles are embedded in PLLA matrix, the resulting composites have been reported to show mechanical brittleness. 17) In the present membrane, the brittleness of the Si-PVH fabric was drastically improved by being bonded with the PLLA fabric.…”

Section: Discussionmentioning

confidence: 74%

New Fabrication Process of Layered Membranes Based on Poly(Lactic Acid) Fibers for Guided Bone Regeneration

2009

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A siloxane-containing poly(L-lactic acid) (PLLA)/calcium carbonate (vaterite) hybrid (Si-PVH) shows excellent proliferation of osteoblast-like cells, which may be enhanced by continuously released silicon-species. In the present work a novel membrane for guided bone regeneration (GBR) was developed using Si-PVH. The membrane was composed of bi-layered nonwoven fabrics; the first layer consists of an Si-PVH fabric with large-sized pores for enhancing bone formation, and the second layer consists of a PLLA fabric with small-sized pores for controlling the intrusion of soft tissues and for reinforcing the mechanical strength of the brittle Si-PVH layer. These nonwoven fabrics with high porosities were prepared by an electrospinning method. The PLLA fabric was placed on the Si-PVH one, and then pressed with a stainless steel mesh heated at 150 C, resulting in the preparation of a bi-layered porous membrane with excellent flexibility. The bi-layered membrane was implanted; the Si-PVH fabric was placed in contact with 8 mm in diameter hole drilled in calvaria of 14-week old rabbits and the PLLA fabric was placed in contact with the skin; new bone formation was observed in the Si-PVH layer. The result showed that the PLLA fibers layer interrupted the intrusion of soft tissues and the Si-PVH one induced the bone formation. The bi-layered membrane is expected to be effective in GBR treatment.

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“…The silicon-doped calcium carbonate (SiV) powders were prepared by a carbonation process as described by Yasue et al [27] and later modified by Kasuga et al [28]. Briefly, calcium hydroxide (Ca(OH) 2 ) and aminopropyltriethoxysilane (APTES) were mixed together in methanol, followed by a constant bubbling of CO 2 gas for 75 min at a rate of 2 l·min -1 .…”

Section: Preparation Of Siv Particlesmentioning

confidence: 99%

Modification and mechanical properties of electrospun blended fibermat of PLGA and siloxane-containing vaterite/PLLA hybrids for bone repair

Poologasundarampilla¹,

Poologasundarampillai

Fujikura

et al. 2011

Express Polym. Lett.

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Abstract. Multi-syringe electrospinning has been successfully employed to produce a blended fibermat composed of poly(lactic-glycolic acid) (PLGA) fibers and a composite fiber for bone repair. The composite fiber, siloxane-containing vaterite (SiV)/poly(L-lactic acid) (PLLA), donated as SiPVH has the ability to release soluble silica species and calcium ions at a controlled rate. The SiPVH fibermats have demonstrated excellent bone regeneration ability in vivo at the front midline of the calvaria of rabbits. However, they are brittle and have low tensile strength resulting from the large particulate SiV (60 wt%) content. In this study, co-electrospinning of PLGA with SiPVH was performed in the hope of achieving a blended fibermat with improved mechanical properties. The co-electrospun fibermats showed good homogeneous blending of the PLGA and SiPVH composite fibers that had excellent flexibility. The blended PLGA-SiPVH fibermats had significantly improved mechanical properties compared to the SiPVH fibermats, where more than 20 times higher elongation to failure was achieved on comparison to the SiPVH fibermat. As well as strength, high porosity and large pore size are vital for the migration of cells into the centre of the graft. This was accomplished by heating the PLGA-SiPVH fibermats at 110°C for a fixed time, which induced the softening and flow of PLGA towards the more stable SiPVH fibers. Heating had successfully produced PLGA-SIPVH fibermats with large open pores and inter-fused SiPVH fibers, which also had better tensile mechanical properties than the SiPVH fibermat.

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Preparation of poly(lactic acid) composites containing calcium carbonate (vaterite)

Cited by 180 publications

References 19 publications

PLA/wood biocomposites: Improving composite strength by chemical treatment of the fibers

PLA/wood biocomposites: Improving composite strength by chemical treatment of the fibers

New Fabrication Process of Layered Membranes Based on Poly(Lactic Acid) Fibers for Guided Bone Regeneration

Modification and mechanical properties of electrospun blended fibermat of PLGA and siloxane-containing vaterite/PLLA hybrids for bone repair

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