The influence of yarn-processing parameters on the tensile properties and structure of poly(l-lactic acid) fibres

Suesat, Jantip; Phillips, D. Z.; Wilding, M. A.; Farrington, David

doi:10.1016/s0032-3861(03)00547-0

Cited by 17 publications

(11 citation statements)

References 17 publications

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“…Although several experimental studies on melt-spun PLLA fibers were done, [11][12][13][14][15][16][17] it is not easy to get information on the mass production of PLLA fibers spun by the one-step process. The main focus of the present study is to obtain information on the mechanical and thermal properties of PLLA fibers on industrial scale machinery.…”

Section: Introductionmentioning

confidence: 99%

Effects of take‐up speed on the structure and properties of melt‐spun poly(L‐lactic acid) fibers

Kim

2008

Polymers for Advanced Techs

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Poly(L-lactic acid) (PLLA) filament fibers were prepared by one-step melt spinning process and the effects of variations in take-up speed on their thermal properties, mechanical properties, and crystalline structures were investigated. Differential scanning calorimetry (DSC) results revealed that the PLLA fibers showed multiple melting peaks and that the melting peak appearing at a lower temperature moved lower while that at a higher temperature moved higher with increasing take-up speed. The glass transition temperature (T g ) obtained from dynamic mechanical analysis (DMA) increased with increasing take-up speed. The tenacity increased and the boiling water shrinkage (BWS) decreased with increasing take-up speed. However, these mechanical and thermal properties were stabilized at take-up speeds over 3500 m/min. The melt-spun PLLA fibers of this study showed an a-form crystal structure which was not affected by the take-up speed. The change in the tendency of the thermal and mechanical properties at around 3500 m/min did not appear to result from the change in crystal form but rather from the change in crystallite size and crystallite orientation.

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Section: Introductionmentioning

confidence: 99%

Effects of take‐up speed on the structure and properties of melt‐spun poly(L‐lactic acid) fibers

Kim

2008

Polymers for Advanced Techs

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“…Conversely, scaffolds made from thermoplastic biodegradable polymers, which are acceptable for in vivo use, for example, poly(lactic acid), (PLA), poly(lacticco-glycolic acid), (PLGA), and poly(glycolic acid), (PGA), have the requisite mechanical properties and can be processed into various shapes and forms. [7][8][9] However, these synthetic polymer surfaces do not readily interact with cells, limiting their effectiveness as scaffolding materials.…”

Section: Introductionmentioning

confidence: 99%

Protein adsorption onto polyester surfaces: Is there a need for surface activation?

Atthoff¹,

Hilborn²

2006

J Biomed Mater Res

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Surface hydrolysis of polyester scaffolds is a convenient technique suggested to promote protein adsorption for improving cell attachment. We have, therefore, investigated the effect of hydrolysis of polyester surfaces for protein adsorption to clarify the conditions needed. Three polyesters, poly(ethylene terephthalate) (PET), poly(lactic acid) (PLA), and poly(glycolic acid) (PGA), were selected. Adsorption was investigated by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and quartz crystal microbalance (QCM). Hydrolyzed PET adsorbed significantly more proteins than nonhydrolyzed. Degradable polymers adsorbed at higher rates when the polymers were hydrolyzed prior to adsorption, but the same amount as nonhydrolyzed, suggesting spontaneous hydrolysis during the adsorption. XPS shows that hydrolysis prior to absorption for PET results in a surface nitrogen composition of ϳ14%, similar to pure protein (16%). Nonhydrolyzed PET surfaces showed only ϳ7% nitrogen, indicating protein layers thinner than ϳ10 nm. Adsorption to PLA and PGA shows nitrogen contents of 14 -15% in both cases. SEM revealed striking differences in morphology of the protein coating. Hydrolyzed or spontaneously hydrolyzable surfaces display a pronounced fibrous structure while nonhydrolyzed surfaces give smooth structures. In combination, the results show that surface hydrolysis increase adsorption rate, but not the amount of proteins on polyesters that degrades in vivo. Surface treatment of nondegradable polyester increases the total amount of proteins and induces the formation of fibrous protein structures. Post hydrolysis treatment by acetic acid, replacing the counter-ion to a proton, further enhances protein attachment. Finally, cell attachment experiments verifies that protein adsorption increase the cell attachment to polyester surfaces.

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“…Like PET, it can also be dyed with disperse dye [2]- [4]. Nevertheless, it was reported that the strength of PLA fiber was relatively inferior to that of PET [5], [6]. Therefore, a further investigation focuses on blending PLA with other textile fibers so as to improvement the strength and also other essential properties [7].…”

Section: Introductionmentioning

confidence: 99%

Effect of Fabric Structure and Degumming Conditions on the Properties of PLA/Silk Blend

Suesat¹,

Ujjin²

2013

IJBBB

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The current research studied the effect of degumming conditions on the properties of PLA and silk yarns aiming to get the actual influence of the process on each fiber which would later be combined together into a blended fabric. The degumming conditions with 10 g/l wetting agent were employed at pH 5, 7 and 10 at various temperatures of 70, 80 and 90oC for 15 min. The most effective degumming was recommended at 70oC and pH 10. Too high temperature (90oC) brought about an eroded fiber surface and deteriorated the fabric strength. The PLA/silk blended fabrics were prepared into different fabric structures and their properties i.e. strength, density and stiffness, were investigated. The fabric properties before and after degumming under a recommended conditions were compared

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The influence of yarn-processing parameters on the tensile properties and structure of poly(l-lactic acid) fibres

Cited by 17 publications

References 17 publications

Effects of take‐up speed on the structure and properties of melt‐spun poly(L‐lactic acid) fibers

Effects of take‐up speed on the structure and properties of melt‐spun poly(L‐lactic acid) fibers

Protein adsorption onto polyester surfaces: Is there a need for surface activation?

Effect of Fabric Structure and Degumming Conditions on the Properties of PLA/Silk Blend

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