Untitled

Ran, Shaofeng; Zong, Xinhua; Fang, Dufei; Hsiao, Benjamin S.; Chu, Benjamin; Cunniff, Philip M.; Phillips, Robert

doi:10.1023/a:1017953412385

Cited by 34 publications

(24 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The common feature seen in the SAXD patterns was a streak along the equator (Figure 4C). Similar SAXD patterns of only an equatorial streak are reported in both Kevlar fibers24 and spider‐silk fibers 25. The streak is attributed to microfibrillar superstructures and needle‐shaped voids whose density is different from that of the surroundings.…”

Section: Resultssupporting

confidence: 71%

Macroscopic Fibers of Well‐Aligned Carbon Nanotubes by Wet Spinning

Zhang

Kozioł

Kinloch

et al. 2008

Small

166

117

View full text Add to dashboard Cite

A simple process to spin fibers consisting of multi-walled carbon nanotubes (CNTs) directly from their lyotropic liquid-crystalline phase is reported. Ethylene glycol is used as the lyotropic solvent, enabling a wider range of CNT types to be spun than previously. Fibers spun with CNTs and nitrogen-doped CNTs are compared. X-ray analysis reveals that nitrogen-doped CNTs have a misalignment of only +/-7.8 degrees to the fiber axis. The tensile strength of the CNT and nitrogen-doped CNT fibers is comparable but the modulus and electrical conductivity of the are lower. The electrical conductivity of both types of CNT fibers is found to be highly anisotropic. The results are discussed in context of the microstructure of the CNTs and fibers.

show abstract

Section: Resultssupporting

confidence: 71%

Macroscopic Fibers of Well‐Aligned Carbon Nanotubes by Wet Spinning

Zhang

Kozioł

Kinloch

et al. 2008

Small

166

117

View full text Add to dashboard Cite

show abstract

“…31,32 stretching can transform the original spherulite morphology into a highly oriented brillar one, in which polymeric chains are preferentially aligned along the stretching direction. 14,18,33 Moreover, a set of uniaxial stretching experiments were carried out at different temperatures to explore the inuence of temperature on polymeric structure development during stretching. 14,18,33 Moreover, a set of uniaxial stretching experiments were carried out at different temperatures to explore the inuence of temperature on polymeric structure development during stretching.…”

Section: Introductionmentioning

confidence: 99%

Lamellae evolution of poly(butylene succinate-co-terephthalate) copolymer induced by uniaxial stretching and subsequent heating

et al. 2014

View full text Add to dashboard Cite

The lamellar structural evolution of biodegradable poly(butylene succinate-co-terephthalate) (PBST) random copolymer was investigated under the conditions of uniaxial stretching at 50 C, and then heating from 50 to 150 C at a strain of 150% by the in situ small-angle X-ray scattering (SAXS) technique. A long period referring to the lamellae while processing PBST was calculated, and a schematic for the structural evolution was proposed. It has been found that the lamellar structure experienced a remarkable transformation accompanied by the strain-induced melting of lamellae and formation of new lamellae when the strain exceeded 84% at 50 C during the initial deformation process. After stretching by 150%, the lamellar structure remained unchanged with the perfection of lamellae in the subsequent heating process from 50 to 120 C. Only at relatively high temperatures (120-150 C), the long period of lamellae underwent a significant increase. Conclusions can be drawn that the lamellar structure of PBST is more sensitive to strain and only a relatively high temperature has a prominent impact on it, which is of great significance to provide targeted design guidance for the manufacturing and application of biodegradable PBST copolymer and also gives potential insights into other random and aliphatic-aromatic copolymers. † Electronic supplementary information (ESI) available: Thermal analysis curves of PBST copolymer (Fig. S1), the stress relaxation curve of PBST copolymer during the heating process as a function of time (Fig. S2), peak tting of XRD curve of PBST copolymer using the soware JADE 5.0 and its corresponding result for crystallinity calculated using the equation X c ¼ area of crystals peak/total area (Fig. S3). See Scheme 1 Illustration showing the chemical structure of the assynthesized PBST. 64626 | RSC Adv., 2014, 4, 64625-64633 This journal is

show abstract

“…Narrower MWD and higher IT developed only the lamellar stacking structure with c-axis crystallites oriented along the drawing direction detected at the deformation stage after necking, but for broader MWD and IT the oriented fibrillar structure was observed in addition to the lamellar stacking --4 structure. Ran et al [25,26] have reported that on-line studies on structural and morphological changes during the heating and drawing process of iPP fibers were carried out using synchrotron SAXS and WAXD techniques. The α-phase crystals were quite defective in the initial iPP fibers and were converted into the mesomorphic modification by drawing at room temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Fiber structure development around the necking point is difficult to monitor in practice because the necking point fluctuates widely within a range from several tens to several hundred times fiber diameter. The in-situ studies introduced previously [24][25][26][27][28] for iPP films and fibers were actually conducted with low time-resolution, involving very low deformation speed. This may because of the time required to heat the fiber or film…”

Section: Introductionmentioning

confidence: 99%

In-situ analysis of fiber structure development for isotactic polypropylene

Kang

Kim

Ikehata

et al. 2011

Polymer

View full text Add to dashboard Cite

ABSTRACT:Structural development of isotactic polypropylene (iPP) fibers was analyzed in real time through in-situ WAXD/SAXS and fiber temperature measurements during CO 2 laser-heated drawing because the CO 2 laser irradiation can nearly fix the necking position on the running fiber. The in-situ WAXD/SAXS measurements were carried out with a high time-resolution of 0.4 ms. The as-spun iPP fibers of two different initial structures were laser-heat-drawn to a draw ratio of 6.5. For the drawing of PP fiber containing mesophase structure, diffraction from the oriented mesophase remained until an elapsed time of 1.0 ms, when oriented α-phase crystal started to form. Meanwhile, for the drawing of PP fiber containing both an α-phase and a mesophase structure, fragmented microcrystals were reorganized by orientation-induced crystallization before an elapsed time of 1.0 ms. The long period increased drastically with fragmentation, and decreased with reorganization. The long period was about 16 nm for both drawn fibers.--3

show abstract

Untitled

Cited by 34 publications

References 17 publications

Macroscopic Fibers of Well‐Aligned Carbon Nanotubes by Wet Spinning

Macroscopic Fibers of Well‐Aligned Carbon Nanotubes by Wet Spinning

Lamellae evolution of poly(butylene succinate-co-terephthalate) copolymer induced by uniaxial stretching and subsequent heating

In-situ analysis of fiber structure development for isotactic polypropylene

Contact Info

Product

Resources

About