Morphological study by TEM on uniaxially oriented thin films of PBT

Yoshioka, Taiyo; Tsuji, Masaki; Kawahara, Yutaka; Kohjiya, Shinzo; Manabe, Norio; Yokota, Yoshimitsu

doi:10.1016/j.polymer.2005.04.046

Cited by 15 publications

(10 citation statements)

References 19 publications

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“…Several recent papers have highlighted the importance of crystalline interphase formation in these composites [ 39 , 42 , 43 , 177 , 178 , 179 ]. It has been observed that CNT can nucleate and template the growth of ordered polymer crystals in several polymer systems including PE [ 180 , 181 , 182 , 183 , 184 , 185 ], nylon 6,6 [ 182 ], PVA [ 186 ], PAN [ 187 ], poly(butylene terephthalate) (PBT) [ 188 , 189 , 190 ], isotactic polypropylene (iPP) [ 191 ], poly( l -lactide) (PLLA) [ 191 ], poly(e-caprolactone) (PCL) [ 192 ], and polyethylene- b -poly(ethylene oxide) (PE- b -PEO) block copolymer [ 193 ]. One of the dominant reinforcement mechanisms in polymer/CNT composites has been suggested to be the presence of ordered polymer interfacial coating structure near CNT [ 194 ].…”

Section: Micro-structural Development In Polymer/cnt Fibersmentioning

confidence: 99%

Structural Polymer-Based Carbon Nanotube Composite Fibers: Understanding the Processing–Structure–Performance Relationship

et al. 2013

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Among the many potential applications of carbon nanotubes (CNT), its usage to strengthen polymers has been paid considerable attention due to the exceptional stiffness, excellent strength, and the low density of CNT. This has provided numerous opportunities for the invention of new material systems for applications requiring high strength and high modulus. Precise control over processing factors, including preserving intact CNT structure, uniform dispersion of CNT within the polymer matrix, effective filler–matrix interfacial interactions, and alignment/orientation of polymer chains/CNT, contribute to the composite fibers’ superior properties. For this reason, fabrication methods play an important role in determining the composite fibers’ microstructure and ultimate mechanical behavior. The current state-of-the-art polymer/CNT high-performance composite fibers, especially in regards to processing–structure–performance, are reviewed in this contribution. Future needs for material by design approaches for processing these nano-composite systems are also discussed.

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Section: Micro-structural Development In Polymer/cnt Fibersmentioning

confidence: 99%

Structural Polymer-Based Carbon Nanotube Composite Fibers: Understanding the Processing–Structure–Performance Relationship

et al. 2013

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“…This peculiar change in storage modulus for HSS fibers are closely related to the well‐developed fibrillar structure 5. Yoshioka et al reported that each of the recognized stacked‐lamellar structures in uniaxially oriented thin films of poly(butylene terephthalate) is assigned to a shish‐kebab structure or a part of it on the basis of crystallographic consideration 11. If HSS fiber structure consists of such fibrillar containing shish‐kebab components, the stabilizing effects of amorphous chains by the imperfect small crystallites generated in amorphous regions will propagate along the fiber axis.…”

Section: Resultsmentioning

confidence: 98%

Oligomer Deposition on the Surface of PET Fiber in Supercritical Carbon Dioxide Fluid

Kawahara

Kamo

Yamamoto

et al. 2005

Macro Materials & Eng

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Summary: Spin‐drawing yarn (SDY) and high‐speed spun (HSS) fibers were produced from recycled poly(ethylene terephthalate) pellets, and the oligomer deposition on the surface of fiber in supercritical carbon dioxide fluid was compared. The oligomer deposition was obvious for SDY, which corresponded to the fact that the amount of imperfect small crystallites generated in amorphous regions through s‐CO2 treatment was much smaller for SDY as compared to that with HSS. The imperfect small crystallites generated in amorphous regions will work as a barrier to the oligomer migration. In order to suppress the deposition of oligomer for SDY, the combination of a heatset treatment and an alkaline etching was useful. At a heatset process, the oligomer migration to the surface layer tends to occur, and the layer becomes rich in oligomer. The following topochemical hydrolysis reaction at alkaline etching removes such layer. Accordingly, the total content of oligomer in etched fiber is reduced. As a result, the oligomer deposition in s‐CO2 treatment becomes not so serious. In addition, the heatset treatment gives the shrinkproof property to SDY, and the property is still retained after the alkaline etching. magnified image

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“…Our previous reports also showed that PET is less likely to crystallize in lamellar form under a uniaxial flow field, compared with other aromatic polyesters, such as poly(ethylene 2,6-naphthalene dicarboxylate) (PEN) and poly(butylene terephthalate) Downloaded by [The University of Manchester Library] at 06:56 21 November 2014 (PBT). [21,22] Therefore, it is supposed that each lamellar entity of the stacked-lamellar structure observed in Fig. 4 is not one coherent crystal but a so-called mosaic crystal composed of crystallites in plural number.…”

Section: Resultsmentioning

confidence: 99%

Stacked-Lamellar Structure in High-Speed Spun PET Fibers as Revealed by TEM

Yoshioka

Kawahara

Kikutani

et al. 2010

Journal of Macromolecular Science, Part B

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Morphological study of high-speed spun poly(ethylene terephthalate) (HSS-PET) fibers spun at 6 km/min was performed by a combination of alkaline etching, surface replica method, and transmission electron microscopy. In the two-stage replica of the alkalineetched fiber, the stacked-lamella-like structure was observed, in which lamella-like striations were stacked in a direction leaning at about 40 • away from the fiber axis. The spacing between the adjacent striations, namely the lamellar periodicity, was measured to be 10-30 nm. We have proposed that the stacked-lamellar structure, which is mainly composed of mosaic lamellar crystals and has the extended-chain crystals connecting the adjacently stacked lamellae, is an appropriate model for the fiber structure of HSS-PET fibers.

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Morphological study by TEM on uniaxially oriented thin films of PBT

Cited by 15 publications

References 19 publications

Structural Polymer-Based Carbon Nanotube Composite Fibers: Understanding the Processing–Structure–Performance Relationship

Structural Polymer-Based Carbon Nanotube Composite Fibers: Understanding the Processing–Structure–Performance Relationship

Oligomer Deposition on the Surface of PET Fiber in Supercritical Carbon Dioxide Fluid

Stacked-Lamellar Structure in High-Speed Spun PET Fibers as Revealed by TEM

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