Electrospun poly(butylene terephthalate) fibers: Entanglement density effect on fiber diameter and fiber nucleating ability towards isotactic polypropylene

Wang, Chi; Fang, Chih Yung; Wang, Chieh Ying

doi:10.1016/j.polymer.2015.07.001

Cited by 38 publications

(48 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As a comparison, unbeaded fibers were obtained at a concentration of 6% w/v, which was above the entanglement concentration. Thus, this suggested that the entanglement concentration played a key role in producing unbeaded fibers for the PLA‐L solutions by electrospinning; this was consistent with other observations …”

Section: Resultssupporting

confidence: 91%

“…This was related to the enhanced deformation resistance of liquid jets with increasing concentration. In principle, the deformation resistance can be qualitatively illustrated by the zero‐shear viscosity . A high zero‐shear viscosity corresponds to a high deformation resistance, and this results in thick fibers.…”

Section: Resultsmentioning

confidence: 99%

“…A reduction in polymer concentration in the solutions is helpful for decreasing the fiber diameter because of the decrease in the deformation resistance of the liquid jets during electrospinning. However, there exists a critical concentration, below which it is unlikely that one can obtain uniform fibers without beads by electrospinning . The critical concentration is called the entanglement concentration; it is a transition between semidilute unentangled and semidilute entangled regimes.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Liu

et al. 2017

J of Applied Polymer Sci

View full text Add to dashboard Cite

In this article, we report the effects of the molecular weight on the electrospinnability of polylactide (PLA) solutions under identical conditions. Only above the entanglement concentration could uniform fibers be generated for PLA with a low molecular weight. However, electrospinning from a solution below its entanglement concentration produced uniform nanofibers when a high-molecular-weight PLA was adopted. The slow relaxation of high-molecular-weight PLA was expected to preserve chain interconnectivity in the highly stretched liquid jets during electrospinning. Correspondingly, rapid cold crystallization and a high modulus were exhibited by the resulting PLA nanofibers because of their remarkable molecular alignment.V C 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44853.

show abstract

Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Liu

et al. 2017

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…In all the three morphologies, a clear transcrystalline layer (TCL), indicative of a very high “linear density” of nucleation sites, develops with time. The TCL is a consequence of lack of lateral separation between the individual growing spherulites on the nucleating surface, causing the crystals to grow exclusively perpendicularly to it. It is apparent that the nucleating efficiency of the three substrates is particularly high; however, some subtle difference among the three can be captured.…”

Section: Resultsmentioning

confidence: 99%

Cross‐nucleation of polybutene‐1 Form II on Form I seeds with different morphology

Wang

Carmeli

et al. 2020

Polymer Crystallization

View full text Add to dashboard Cite

Polybutene-1 (PB-1) trigonal Form I crystals with different morphologies, namely spherulitic, hedritic, and fibrous, were used as seeds to quantitatively study the cross-nucleation kinetics of the tetragonal Form II. Interestingly, a large difference in the cross-nucleation ability of the various Form I seeds was observed. The Form I fiber exhibits the fastest cross-nucleation, followed by the hedrite and eventually by the spherulite. The nucleation induction time was quantified from the evolution of the transmitted light intensity via polarized optical microscopy. The data were tested against different nucleation models, revealing that the rate-determining step for nucleation is the growth of the nucleus to attain the critical dimension, rather than the formation of the first crystalline layer in contact with the substrate. In addition, for spherulitic seeds, a meaningful dependence of cross-nucleation induction time on Form I lamellar thickness was found, with the kinetics being faster for higher original seed's crystallization temperatures. The results were interpreted assuming a free energy barrier for cross-nucleation which is a function of the mismatch between the daughter and the parent polymorphs' lamellar dimensions. This aspect, together with the calculated low values of interfacial free energy difference parameter for nucleation, suggests the possible existence of an epitaxial relationships between crossnucleating PB-1 Form II and Form I. K E Y W O R D Scross-nucleation, morphology, polybutene-1, polymorphism

show abstract

“…However, most crystals are peanut‐like crystals (Figure a), which indicates the formation of peanut‐like crystals is less possible due to the combination of two or more neighboring spherulites but mainly induced by the row‐nuclei. Generally, the row‐nuclei can appear at the surface of needle‐like nucleating agents, fibers, and the stress‐induced extended chains . Because there is no nucleating agent in this system, the row nucleation of BAPC should be ascribed to the stress.…”

Section: Resultsmentioning

confidence: 98%

Peanut-Like Crystals in Polycarbonate/Plasticizer Blends

Liang

Zhou

et al. 2016

Macromol. Chem. Phys.

View full text Add to dashboard Cite

Bisphenol‐A polycarbonate (BAPC) crystal with unusual morphology is obtained in the solution‐cast films of BAPC/plasticizer blends. It seems like Siamese twin spherulites, and owns a peanut‐like morphology with more than one nucleating sites. Furthermore, concentric black dotted rings, which should be the aggregation regions of plasticizers, are also observed within the peanut‐like crystals. The peanut‐like morphology has no selectivity to the kinds of plasticizer and the casting temperature. The development of these peanut‐like crystals is mainly ascribed to the local orientations of BAPC chains, which are induced by the concentration fluctuation during solvent evaporation and further fixed by the quick drying process. The concentric black dotted rings within the peanut‐like crystals shall be attributed to the driving effect of BAPC crystalline lamellae and phase separation between plasticizers and BAPC. This work opens a new window for the regular arrangement of small molecules.

show abstract

Electrospun poly(butylene terephthalate) fibers: Entanglement density effect on fiber diameter and fiber nucleating ability towards isotactic polypropylene

Cited by 38 publications

References 42 publications

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

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

Cross‐nucleation of polybutene‐1 Form II on Form I seeds with different morphology

Peanut-Like Crystals in Polycarbonate/Plasticizer Blends

Contact Info

Product

Resources

About