Melt Spinning of Biodegradable Nanofibrillary Structures from Poly(lactic acid) and Poly(vinyl alcohol) Blends

Tran, Ngoc Quang; Brünig, Harald; Hinüber, Claudia; Heinrich, Gert

doi:10.1002/mame.201300125

Cited by 33 publications

(25 citation statements)

References 16 publications

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“…The calculation of the interfacial tension between PLA and PVA can be seen in Appendix,

η_{r} = η_{d} / η_{m}

is the viscosity ratio between the dispersed phase viscosity

η_{d}

and the matrix viscosity

η_{m}

, and

\dot{γ}

is the shear rate.

η_{r}

and

η_{m}

are obtained using oscillatory rheometer . It is worth noting here that the viscosities

η_{r}

and

η_{m}

depend on shear rate.…”

Section: Resultsmentioning

confidence: 99%

Controlling micro‐ and nanofibrillar morphology of polymer blends in low‐speed melt spinning process. Part II: Influences of extrusion rate on morphological changes of a PLA/PVA blend through a capillary die

Tran

Brünig

Landwehr

et al. 2016

J of Applied Polymer Sci

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The effects of the extrusion rate on the morphological changes of poly(lactic acid) (PLA)/poly(vinyl alcohol) (PVA) blend through a capillary die were investigated. In this study, the extrusion rate or mass flow rate is altered from 0.5 g min−1 to 2 g min−1 with an increment of 0.5 g min−1. The PLA/PVA blend with a composition of 30/70 (wt %) exhibits a particle matrix morphology with dispersed PLA droplets within the PVA matrix. It is found that, the spherical or ellipsoidal dispersed PLA droplets are elongated and coalesced into rod‐like or longer ellipsoidal droplets when they pass through the capillary die. When the extrusion rate increases, the coalescence between the large PLA droplets occurs more intense. However, the changes of the extrusion rate have no strong effect on the coalescence of small droplets having diameter less than about 150 nm. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44257.

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“…The calculation of the interfacial tension between PLA and PVA can be seen in Appendix,

η_{r} = η_{d} / η_{m}

is the viscosity ratio between the dispersed phase viscosity

η_{d}

and the matrix viscosity

η_{m}

, and

\dot{γ}

is the shear rate.

η_{r}

and

η_{m}

are obtained using oscillatory rheometer . It is worth noting here that the viscosities

η_{r}

and

η_{m}

depend on shear rate.…”

Section: Resultsmentioning

confidence: 99%

Controlling micro‐ and nanofibrillar morphology of polymer blends in low‐speed melt spinning process. Part II: Influences of extrusion rate on morphological changes of a PLA/PVA blend through a capillary die

Tran

Brünig

Landwehr

et al. 2016

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…PLA as a biodegradable and biocompatible polymer has become very important in the field of tissue engineering. The minimum diameter of PLA nanofibers produced by melt electrospinning was found to be 740 nm, while those produced by extraction from its blend with PVA was 60 nm . Furthermore, it could be arranged in a two‐ or three‐dimensional structure .…”

Section: Discussionmentioning

confidence: 95%

“…As sacrificing polymer PVA was used by a few researchers, PVA could be dissolved in water that is less hazardous and environmentally safer than other solvents previously used. It should be considered that PVA degrades at a temperature less than melting temperature of many melt process able polymers that is a limitation for its use.…”

Section: Nanofibers Prepared From Other Blendsmentioning

confidence: 99%

“…Subsequently, the filaments were woven or knitted into fabrics, and poly(lactic acid) nanofibrils with an average diameter of 60 nm were obtained by the removal of the PVA matrix with water. It was thought that the produced 2D‐ and 3D‐PLA textile structures were promising candidates as scaffolds for tissue engineering …”

Section: Nanofibers Prepared From Other Blendsmentioning

confidence: 99%

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Extraction of nanofibers from polymer blends: A brief review

Rabiei

Kish

2018

Polymers for Advanced Techs

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This review is about the naturally formed and intentionally produced nanofibrils or nanofibers (NFs) that have been extracted and utilized or expected to be used for special applications. The diameter of NFs ranges between a few to a few hundred nanometers. Methods to arrange synthetic NFs assembly in yarns or pads forms have been examined. High throughput productions, versatility of various thermoplastics, and less environmental pollution are the advantages of the methods of extraction, which seems to make it as an economical process. It can also be used for the polymers that are difficult to be converted to NFs by electrospinning. The process is challenging and scientifically fascinating to attract the investigators. There are many more polymers to be considered, and there are many more envisioned applications that have to be practiced in the future. A theoretical base is needed for the evaluation of the effects of polymer flow parameters on the extracted NFs properties.

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“…Mostly, fibrillar morphology can be analyzed from two aspects which are in close relation: morphological and rheological aspects. From a morphological point of view, various processing methods such as fiber spinning,18,19 injection molding,14 compression molding,20,4 and recently laminating‐multiplying elements (LMEs)8,20 have been applied and designed to fabricate well‐dispersed fibrils optimized to reach the highest mechanical strength. However, the library of fibrillar technology lacks complementary information about influence of processing temperature on fibril structure and its respective diameter and length can definitely help engineers to manipulate more precise morphologies.…”

Section: Introductionmentioning

confidence: 99%

An Insight into Phenomenology of Polytrimethylene Terephthalate Fibrillation

Hajiraissi

2020

Macro Materials & Eng

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The objective of this work is to analyze the effect of the processing temperature on fibrillation of the dispersed phase and to correlate melt viscoelastic responses to formed morphologies. A blend system of polypropylene (PP)/polytrimethylene terephthalate (PTT) with varying ratios (PP/PTT: 99/1, 94/6, 90/10, and 80/20) is prepared on a co‐rotating twin screw extruder, and then pelletized blend samples are fed into a laboratory mixing extruder to spin monofilaments at three different orifice temperatures of 180, 195, and 240 °C. As revealed by scanning electron microscopy, a nano‐fibrillar morphology forms after employing spinning. Rheological approach performed in the linear region shows a transition from terminal trend into non‐terminal trend in the low‐frequency region when the fibrillar morphology forms, the magnitude and width of which are reflective of the fibril growth. Transient stress measurements prove its capability to enable the blend system to show potentials of morphology development during dynamic tests. Startup of steady shear flow shows that after reaching the percolation concentration of dispersed phase, fibril–fibril coalescence leads to the formation of long fibrils whose contribution to the blend system increases the elasticity of the blend fibers.

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Melt Spinning of Biodegradable Nanofibrillary Structures from Poly(lactic acid) and Poly(vinyl alcohol) Blends

Cited by 33 publications

References 16 publications

Controlling micro‐ and nanofibrillar morphology of polymer blends in low‐speed melt spinning process. Part II: Influences of extrusion rate on morphological changes of a PLA/PVA blend through a capillary die

Controlling micro‐ and nanofibrillar morphology of polymer blends in low‐speed melt spinning process. Part II: Influences of extrusion rate on morphological changes of a PLA/PVA blend through a capillary die

Extraction of nanofibers from polymer blends: A brief review

An Insight into Phenomenology of Polytrimethylene Terephthalate Fibrillation

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