Uniform high‐molecular‐weight polylactide nanofibers electrospun from a solution below its entanglement concentration

Li, Shuai; Lv, Ruihua; Liu, Hesheng; Na, Bing; Zhou, Haijiang; Ge, Liya

doi:10.1002/app.44853

Cited by 11 publications

(8 citation statements)

References 31 publications

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“…In addition, the thermal and tensile properties of fiber felt were also studied. Li et al [139] came to a similar but more detailed conclusion, which are the uniform fibers that can only be obtained when the concentration of low molecular weight PLA solution is above the entanglement concentration. On the contrary, when the concentration of high molecular weight PLA solution is below entanglement concentration, uniform fibers cannot be obtained.…”

Section: Degradable Electrospun Packaging Membranementioning

confidence: 78%

Electrospun Functional Materials toward Food Packaging Applications: A Review

et al. 2020

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Electrospinning is an effective and versatile method to prepare continuous polymer nanofibers and nonwovens that exhibit excellent properties such as high molecular orientation, high porosity and large specific surface area. Benefitting from these outstanding and intriguing features, electrospun nanofibers have been employed as a promising candidate for the fabrication of food packaging materials. Actually, the electrospun nanofibers used in food packaging must possess biocompatibility and low toxicity. In addition, in order to maintain the quality of food and extend its shelf life, food packaging materials also need to have certain functionality. Herein, in this timely review, functional materials produced from electrospinning toward food packaging are highlighted. At first, various strategies for the preparation of polymer electrospun fiber are introduced, then the characteristics of different packaging films and their successful applications in food packaging are summarized, including degradable materials, superhydrophobic materials, edible materials, antibacterial materials and high barrier materials. Finally, the future perspective and key challenges of polymer electrospun nanofibers for food packaging are also discussed. Hopefully, this review would provide a fundamental insight into the development of electrospun functional materials with high performance for food packaging.

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Section: Degradable Electrospun Packaging Membranementioning

confidence: 78%

Electrospun Functional Materials toward Food Packaging Applications: A Review

et al. 2020

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“…Afterward, a sustained release profile over 6 hours was observed. Several other polymers, such as PLA, [ 116 ] gelatin, [ 117 ] PCL, [ 118 ] and polymers from bacterial sources, such as polyhydroxyalkanoate, [ 119 ] poly(3‐hydroxybutyrate‐ co ‐3‐hydroxyvalerate), [ 120 ] can be used to produce ultrafine fibers using electrospinning.…”

Section: Classification Of Drug‐eluting Textilesmentioning

confidence: 99%

Drug‐Eluting Medical Textiles: From Fiber Production and Textile Fabrication to Drug Loading and Delivery

Rostamitabar

Abdelgawad

Jockenhoevel

et al. 2021

Macromolecular Bioscience

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Drug-eluting medical textiles have recently gained great attention to be used in different applications due to their cost effectiveness and unique physical and chemical properties. Using various fiber production and textile fabrication technologies, fibrous constructs with the required properties for the target drug delivery systems can be designed and fabricated. This review summarizes the current advances in the fabrication of drug-eluting medical textiles. Different fiber production methods such as melt-, wet-, and electro-spinning, and textile fabrication techniques such as knitting and weaving are explained. Moreover, various loading processes of bioactive agents to obtain drug-loaded fibrous structures with required physicochemical and morphological properties, drug delivery mechanisms, and drug release kinetics are discussed. Finally, the current applications of drug-eluting fibrous systems in wound care, tissue engineering, and transdermal drug delivery are highlighted.

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“…Gupta et al 19 (seven linear homopolymers of poly(methyl methacrylate), M w ranging from 12,470 to 365,700 g/mol) showed that for the narrow (M w /M n~1 .03-1.35) and relatively broader (M w /M n~1 .6-2.12) molecular weight distributions the coefficient k attains the values 2 and 10/3, respectively. Li et al 18 (polylactide) found beadless nanofibres for concentrations exceeding c e in the case of M w = 82 kg/mol and for M w = 503 kg/mol even for concentrations below c e . McKee et al, 14 increased as M w decreased and the branching index value decreased 'since the low molecular weight chains occupy a smaller hydrodynamic volume and require a higher concentration before they begin to topologically constrain one another and entangle'.…”

Section: Introductionmentioning

confidence: 98%

“…If only a limited (even 1‐figure) number of experiments are carried out, then setting locations of overlap ( c * ) and entanglement ( c e ) viscosities is questionable. Moreover, even in the case of denser experiments an accuracy of c e setting is made complicated by an appearance of the 'bump' preceding the crossover entangled concentration c e 3,7,10,11,14–18 . This bump represents (in the log–log coordinates in the rheogram: specific viscosity vs. concentration) a mild upper deviation from the approximate linear segment in the immediate vicinity preceding c e .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of an onset of electrospun beadless poly(ethylene oxide) nanofibres

Filip

Zelenková

Peer

2020

J of Applied Polymer Sci

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To evaluate the lowest polymer concentration within a solvent from which there appears beadless nanofibres during the process of electrospinning, is rather complicated. A widely used method is based on a determination of so called entanglement concentration c e and the onsets of beadless nanofibres are characterized by multipliers of c e subjected to used materials. However, a determination of c e as an intersection point of two linear segments (in log-log coordinates specific viscosity vs. concentration) in a semi-dilute region is not applicable for all materials as for instance a solution of poly(ethylene oxide) (PEO) in water does not exhibit 'classical' three linear segments within the dilute and semi-dilute regions determining overlap and entanglement concentrations. For such cases a new approach for the evaluation of an initial concentration from which beadless nanofibres are produced is proposed. This method does not use the terms overlap and entanglement concentrations. The procedure is demonstrated using four PEO solutions differing in molecular weight. The relationship expressing initial concentration in dependence on PEO molecular weight containing no adjustable parameters is proposed.

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Uniform high‐molecular‐weight polylactide nanofibers electrospun from a solution below its entanglement concentration

Cited by 11 publications

References 31 publications

Electrospun Functional Materials toward Food Packaging Applications: A Review

Electrospun Functional Materials toward Food Packaging Applications: A Review

Drug‐Eluting Medical Textiles: From Fiber Production and Textile Fabrication to Drug Loading and Delivery

Evaluation of an onset of electrospun beadless poly(ethylene oxide) nanofibres

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