Electrospun nanofiber-reinforced polypropylene composites: Nucleating ability of nanofibers

Wang, Chi; Wu, Yi Jiun; Fang, Chih Yung; Tsai, Cheng Wein

doi:10.1016/j.compscitech.2016.02.006

Cited by 24 publications

(27 citation statements)

References 33 publications

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“…A distinct decrease of the nucleation rate as the crystallization temperature is increased can be seen, as expected for the classical heterogeneous nucleation process, and observed in different i-PP/fiber composite in the literature. [4][5][6][7][8][9][10] We note that, at low crystallization temperatures where the TCL develops, the direct counting of the number of nuclei is not possible. On the other hand, above a certain crystallization temperature, the nucleation density on the fibers become too low for obtaining statistically meaningful results in few experiments.…”

Section: Quantitative Evaluation Of the Nucleation Process Of Plla On Different Fiber Substratesmentioning

confidence: 90%

“…Such observations are well in line with previous work on fiber induced nucleation on iso-polypropylene (i-PP) composites. [4][5][6][7][8][9][10] For example, at 140 °C, transcrystalline layer was observed for i-PP in contact with Teflon fiber, but not for i-PP/Kevlar fiber composite. The latter fiber was able to induce TCL when polypropylene crystallized at 135 °C.…”

Section: Morphology Investigationmentioning

confidence: 98%

“…[1][2][3] This peculiar morphology is addressed as transcrystalline layer (TCL), and is typically associated to the high nucleating ability of the embedded fibers' surface. [4][5][6][7][8][9][10][11][12] The formation of TCL is of technological importance, because it can significantly influence the mechanical properties of the product. [13][14][15][16][17][18][19] In fact, TCL presents a higher Young's modulus compared with the bulk materials, despite a lower strain at break.…”

Section: Introductionmentioning

confidence: 99%

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Nucleation of Poly(lactide) on the Surface of Different Fibers

et al. 2019

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The nucleation process of poly(lactide) (PLA) on a series of fibers was studied by means of in-situ Polarized Optical Microscope (POM) during crystallization.Several synthetic and natural fibers (PLLA stereocomplex fibers (SC), PET, carbon, Kevlar, glass, hemp, linen and cellulose) were employed, and compared to customspun fiber of stereocomplex enantiomeric PLA blend.Meaningful differences in the nucleating ability towards PLA could be found for all the considered fibers. Stereocomplex PLA fibers display extremely high nucleating efficiency, with the development of a continuous transcrystalline morphology on their surface, up to high crystallization temperatures. Quantitative measurement of the nucleation rate allowed a comparison of the different fiber substrates in the light of classical heterogeneous nucleation theory, by considering the interfacial free energy difference parameter, Δσ, directly related to the nucleation barrier.The topography of the fibers surface was investigated by atomic force microscopy (AFM), and tentatively related to the measured nucleation ability. While a general effect of surface roughness on lowering the heterogeneous nucleation energy barrier can be deduced, deviations can be observed, in particular for carbon and stereocomplex PLA fibers. The different fiber wettability by PLA melt suggests that chemical interactions between the substrate and the crystallizing polymer also play a meaningful role in promoting the nucleation, although this aspect is generally disregarded in the literature -in favor of surface roughness. Moreover, the specific surface topography is shown to largely affect the density of available nucleation sites along the fiber.

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Section: Quantitative Evaluation Of the Nucleation Process Of Plla On Different Fiber Substratesmentioning

confidence: 90%

Section: Morphology Investigationmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Nucleation of Poly(lactide) on the Surface of Different Fibers

et al. 2019

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“…polytetrafluoroethylene (PTFE), polyethylene terephthalate (PET), polyvinyl alcohol (PVA), polyamide 6/nylon 6 (PA6)) favor a-crystals, 37,38 while isotactic polystyrene (i-PS) induces the b-crystallization in i-PP. 39,40 Montmorillonite (MMT) modified with hexadecyl trimethyl ammonium bromide, is reported to favor a-form i-PP. 25 During fiber spinning and drawing, both shear and tensile stresses exist and, thus, competitive phenomena can occur regarding which i-PP crystalline structure forms.…”

Section: Crystallinity In Pp Composites and Fibersmentioning

confidence: 99%

Polypropylene nanocomposite fibers: A review of current trends and new developments

Tsioptsias

Leontiadis

Tzimpilis

et al. 2020

Journal of Plastic Film & Sheeting

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In this review, traditional and novel techniques for producing micro- and nano- fibers are discussed and various nanofillers, their modifications and polypropylene (PP) functionalization routes are presented. Their influence on PP properties is discussed and new PP composite fiber applications are presented. This review reveals interesting conclusions, such as that in terms of mechanical reinforcement, there is no nano-filler that can improve tensile strength to the extent that it is improved by drawing. However, in some cases, composite drawn fibers are characterized by higher tensile strength than drawn neat PP. With some notable exceptions, the PP nanocomposites lack of “dramatic” properties improvement is mainly due to the non-polar nature of the hydrocarbon chain, which does not favor strong intermolecular interactions with most popular (mainly inorganic) nano-fillers. However, other properties such as electric conductivity, water contact angle and others can be effectively altered using various nanofillers in PP matrices.

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“…Incorporation of inorganic reinforcing fillers is an effective way to improve the properties of polymer materials [10][11][12][13]. Wang et al reported that the electrospun fibres could act not only as reinforcing fillers but also as superior nucleating agents to alter the crystal morphology of the polypropylene (PP) matrix [14]. Nevertheless, addition of the inorganic filler in polymer melts induced the interface instability of the polymer matrix, and slipping of the interface resulted in poor compatibility of both phases, which finally affected the optimal mechanical properties of the polymer.…”

Section: Introductionmentioning

confidence: 99%

Preparation of high-performance polyethylene tubes under the coexistence of silicone cross-linked polyethylene and rotation extrusion

Sun

Guo

et al. 2019

R. Soc. open sci.

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In this study, the silicone cross-linked polyethylene (Si-XLPE) powder with better thermoplastic performance and abundant cross-linked network points was attained by using solid-state shear mechanochemical (S 3 M) technology and it was added into high-density polyethylene (HDPE) matrix to prepare Si-XLPE/HDPE tubes by a rotation extrusion rheometer. SEM and 2D-SAXS experiments showed that the presence of Si-XLPE and rotation extrusion facilitated the formation of stable shish-kebabs which deviated from the axial direction in polyethylene (PE) tubes. This result was interpreted that introduction of Si-XLPE in PE tubes provided abundant molecular cross-linked network structures, which suppressed the thermal movement and relaxation of oriented molecular chains owing to intermolecular interaction. Moreover, the axial and hoop flow field further promoted orientation of the permanent cross-linked network entanglement points and formation of more stable cluster-like shish structures in the off-axial direction during the rotation extrusion process. Besides, our experimental results had also ascertained that molecular orientation and shish-kebabs in off-axial direction should be the primary responsibility for the remarkable enhancement of hoop torsional strength in PE tubes. Hoop torsional strength of PE tubes adding Si-XLPE reached 19.58 MPa when the mandrel rotation rate was 30 r.p.m., while that of conventional extruded PE tubes was only 9.83 MPa. As a consequence, PE tubes with excellent performance were prepared under the combined effect of Si-XLPE and rotation extrusion.

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Electrospun nanofiber-reinforced polypropylene composites: Nucleating ability of nanofibers

Cited by 24 publications

References 33 publications

Nucleation of Poly(lactide) on the Surface of Different Fibers

Nucleation of Poly(lactide) on the Surface of Different Fibers

Polypropylene nanocomposite fibers: A review of current trends and new developments

Preparation of high-performance polyethylene tubes under the coexistence of silicone cross-linked polyethylene and rotation extrusion

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