Electrospinning highly oriented and crystalline poly(lactic acid) fiber mats

Smyth, Matthew; Poursorkhabi, Vida; Mohanty, Amar K.; Gregori, Stefano; Misra, Manjusri

doi:10.1007/s10853-013-7899-z

Cited by 45 publications

(25 citation statements)

References 32 publications

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“…This is evidenced by the absence of a cold crystallization peak in the thermograms of the mats subjected to thermal treatment. The results we have obtained are consistent with the literature data for increase in the crystallinity degree of PLA after thermal treatment [19]. Unlike the case of PLA, the crystallinity degree of PCL was found to decrease after heating the mats, which was observed for the PLA 50 /PCL 50 , and PLA elspin(3) /PCL elspray(3) systems (Table 1).…”

Section: Degree Of Crystallinity and Thermalsupporting

confidence: 91%

Enhancing the mechanical properties of electrospun polyester mats by heat treatment

Kancheva¹,

Toncheva²,

Manolova³

et al. 2015

Express Polym. Lett.

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Abstract. Microfibrous materials with a targeted design based on poly(L-lactic acid) (PLA) and poly(!-caprolactone) (PCL) were prepared by electrospinning and by combining electrospinning and electrospraying. Several approaches were used: (i) electrospinning of a common solution of the two polymers, (ii) simultaneous electrospinning of two separate solutions of PLA and PCL, (iii) electrospinning of PLA solution in conjunction with electrospraying of PCL solution, and (iv) alternating layer-by-layer deposition by electrospinning of separate PLA and PCL solutions. The mats were heated at the melting temperature of PCL (60°"), thus achieving melting of PCL fibers/particles and thermal sealing of the fibers. The mats subjected to thermal treatment were characterized by greater mean fiber diameters and reduced values of the water contact angle compared to the pristine mats. Heat treatment of the mats affected their thermal stability and led to an increase in the crystallinity degree of PLA incorporated in the mats, whereas that of PCL was reduced. All mats were characterized by enhanced mechanical properties after thermal treatment as compared to the non-treated fibrous materials.

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Section: Degree Of Crystallinity and Thermalsupporting

confidence: 91%

Enhancing the mechanical properties of electrospun polyester mats by heat treatment

Kancheva¹,

Toncheva²,

Manolova³

et al. 2015

Express Polym. Lett.

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“…Temperatures above the glass transition temperature of PLLA (~60 °C) [85] enabled enhanced chain mobility which subsequently led to improved crystallisation during the nanoconfined growth within the template pores. Crystallinity of up to 70% ± 5% was achieved with starting solution temperature at 100 °C, compared with typical 30%-40% from electrospun nanofibers [88][89][90], as verified by XRD data ( figure 12(c)). …”

Section: Template-grown Poly-l-lactic Acid Exhibiting With Shear Piezmentioning

confidence: 59%

Nanostructured polymer-based piezoelectric and triboelectric materials and devices for energy harvesting applications

Jing

Kar‐Narayan

2018

J. Phys. D: Appl. Phys.

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Harvesting energy from ambient mechanical sources in our environment has attracted considerable interest due to its potential to power applications such as ubiquitous wireless sensors and Internet of Things devices. In this context, piezoelectric and/or triboelectric materials offer a relatively simple means of directly converting mechanical energy from ubiquitous ambient vibrating sources into electrical power for microscale/nanoscale device applications. In particular, nanoscale energy harvesters, or nanogenerators, are capable of converting low-level ambient vibrations into electrical energy, thus are vital to the realization of the next generation of self-powered devices. Polymer-based nanogenerators are attractive as they are inherently flexible and robust, making them less prone to mechanical failure which is a key requirement for vibrational energy harvesters. They are also lightweight, easy and cheap to fabricate, lead-free and biocompatible, but in many cases their energy harvesting performance is found lacking in comparison to more commonly studied inorganic materials. Recent advances have been made in developing scalable nanofabrication techniques for flexible and low-cost polymer-based nanogenerators with improved energy conversion efficiency, including the incorporation of high-quality polymer nanowires with enhanced crystallinity, piezoelectric and/or surface charge properties. In this review, we discuss aspects of nanomaterials growth and energy harvester device design, including those involving nanowires of polymers of polyvinylidene fluoride and its co-polymers, nylon-11, and poly-lactic acid for scalable piezoelectric and triboelectric nanogenerator applications, as well as the design and performance of polymer-ceramic nanocomposite nanogenerators. In particular, we highlight the effects of growth parameters, nanoconfinement, self-poling, surface polarization, crystalline phases, and device assembly on the energy harvesting performance of a range of recently reported nanostructured polymer-based materials and devices.

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“…Electrospinning is one of the most straightforward and simplest methods for forming continuous nano‐ to micro‐scale fibers by forcing the materials through a spinneret under the effect of an electric field, then depositing fibers on a collector . This method can be divided into solution electrospinning and melt electrospinning according to the different states of the spinning materials.…”

Section: Introductionmentioning

confidence: 99%

Orthogonal design preparation of phenolic fiber by melt electrospinning

Xie

Chen

Ramakrishna

et al. 2015

J of Applied Polymer Sci

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Through orthogonal experimental methods, the melt electrospinning of pure phenolic fibers has been achieved. The preparation is based on an orthogonal experimental method, which was designed to investigate the optimal conditions for production through integrated effects of spinning temperature, gap between spinneret and collector, as well as applied voltage. We found that optimal spinning conditions at 1608C, a spinneret-to-collector gap of 8 cm, and applied voltage at 40 kV produce an average electrospun fiber diameter reaching 4.44 6 0.76 lm, with narrow variance distribution. The fibers were cured in a solution with 18.5% formaldehyde and 12% hydrochloric acid, heated from room temperature to 808C and maintained 1h. In this report, the morphology, structural changes, and heat resistance of the fibers are characterized. Obtained results reveal that curing the fiber reduces crystallization and improves heat resistance.

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Electrospinning highly oriented and crystalline poly(lactic acid) fiber mats

Cited by 45 publications

References 32 publications

Enhancing the mechanical properties of electrospun polyester mats by heat treatment

Enhancing the mechanical properties of electrospun polyester mats by heat treatment

Nanostructured polymer-based piezoelectric and triboelectric materials and devices for energy harvesting applications

Orthogonal design preparation of phenolic fiber by melt electrospinning

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