Polymer transcrystallinity induced by carbon nanotubes

Zhang, Shanju; Minus, Marilyn L.; Zhu, Lingbo; Wong, Ching‐Ping; Kumar, Satish

doi:10.1016/j.polymer.2008.01.018

Cited by 216 publications

(205 citation statements)

References 43 publications

(23 reference statements)

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“…Such heterogeneous nucleation effects have also been noted to occur on nanofiller surfaces during melt as well as solution crystallization of other semicrystalline polymers including PE, nylon-6,6, poly(propylene) (PP), and poly(ethylene naphthalate) (PEN). 21,[42][43][44][45] A decrease in polymer crystal size and an increase in the rate of crystallization have also been observed during various studies performed under shear as well as under quiescent conditions. 43,44,46 Precipitation of PBT and CNF-PBT nanostructures Representative SEM micrographs of the 4.8% CNF-PBT precipitates obtained upon the solvent-antisolvent precipitation process are shown in Figure 7.…”

mentioning

confidence: 82%

Polymer crystallization and precipitation‐induced wrapping of carbon nanofibers with PBT

Mago

Kalyon

Fisher

2009

J of Applied Polymer Sci

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Carbon nanofibers (CNFs) have attracted significant interest because of their excellent mechanical, electrical, and physical properties. Recent advances in chemical functionalization strategies are anticipated to extend their utility in various applications. In this study, noncovalent methods of CNF functionalization utilizing solution crystallization and precipitation techniques were used to create hybrid nanostructures consisting of CNFs and poly(butylene terephthalate) (PBT). Key to this study is the finding that o-chlorophenol can be used as a suitable solvent to dissolve PBT to generate these nanostructures. PBT crystallization was documented via wideangle X-ray analysis and differential scanning calorimetry and was due to the nucleation effect of the CNFs. The sizes of the PBT crystals could be manipulated by altering the polymer concentration. The solution crystallization and precipitation techniques provide an alternative strategy to alter and control the nanostructure/polymer interface. The resulting nanohybrid structures may potentially find use in a broad range of applications including electronic devices, sensors, and as reinforcing agents in a polymer matrix.

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mentioning

confidence: 82%

Polymer crystallization and precipitation‐induced wrapping of carbon nanofibers with PBT

Mago

Kalyon

Fisher

2009

J of Applied Polymer Sci

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“…161 A detailed study on single carbon nanotube fibers showed that the growth rate of the transcrystalline morphology for isotactic polypropylene approximately matched that measured for carbon or Kevlar fibers, indicating that the surface characteristics do not affect the growth rate. 217 The attachment of a crystallizing polymer on a surface of a carbon nanotube via a covalent bond has been shown to speed crystallization rate at low overall relative crystallizations and slow the rate at higher relative crystallizations with an overall slower rate as compared to unattached polymers in one study. The normal spherulitic morphology does not appear in polarized optical micrographs; instead the crystallites appear as elongated entities that are consistent with an entirely transcrystalline or NHSK structures.…”

Section: Semicrystalline Polymersmentioning

confidence: 95%

“…The author is not aware of microscopy showing a shish-kebab type morphology in a bulk material under quiescent cooling conditions; in isotactic polypropylene a transcrystalline morphology was found. 205,216,217 Whether a transcrystalline or shish-kebab type morphology results in meltspun nanotube composites has been addressed for high-density polyethylene (HDPE). In unfilled linear polymers such as HDPE, shish-kebab structures from the melt form easiest with materials with bimodal molecular weight distributions; a small amount of easy to orient high molecular weight material to form the shish, and a larger amount of low molecular weight material to form the kebabs.…”

Section: Semicrystalline Polymersmentioning

confidence: 99%

Effects of carbon nanotubes on polymer physics

Grady

2012

J Polym Sci B Polym Phys

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A single carbon nanotube has many similarities with an individual polymer chain including the fact that the end-to-end length of both are often about the same and the diameter of the chain is about the same (for single-walled nanotubes) or only $10 to 20 times larger (for multiwalled nanotubes). The combination of the solid surface and the similarity of the two materials means that polymer physics are altered in manners not seen with any other type of commonly used filler. The purpose of this review is to update a chapter that appears in a recent tome by Grady (2011) and describe how polymer physics is altered in composites that contain carbon nanotubes. Subjects that will be discussed include chain configuration, glass transition, polymer diffusion, unit cells and crystalline superstructure (lamellae, spherulites and shishkebabs), and crystallization kinetics. V C 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 50: 2012

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“…Therefore, the transfer of effective stress was inhibited to reduce the impact strength of the stress. Zhang et al [6] tested the mechanical properties of CNTs-reinforced PP composites and found that both the tensile strength and modulus were greatly improved. It was elucidated that the presence of interfacial transverse crystals enabled the effective transfer of load from the PP matrix to fiber, enhancing the performance.…”

Section: Current Work On Properties Of Fiber-reinforced Injection-molmentioning

confidence: 99%

Properties and Structure of Fiber-Reinforced Injection-Molded Part

Yang

et al. 2016

MATEC Web Conf.

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Abstract.Fiber-reinforced plastics exhibit many merits and injection molding is one of the most common method for the production of plastics. Therefore, injection-molded fiber-reinforced plastic products have been widely used and their properties and structure were studied in the present work. The influences of fiber type, fiber content, and processing on the internal morphological structure of the injection-molded composite materials were investigated. Moreover, the change of performance of plastic products was analyzed.

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Polymer transcrystallinity induced by carbon nanotubes

Cited by 216 publications

References 43 publications

Polymer crystallization and precipitation‐induced wrapping of carbon nanofibers with PBT

Polymer crystallization and precipitation‐induced wrapping of carbon nanofibers with PBT

Effects of carbon nanotubes on polymer physics

Properties and Structure of Fiber-Reinforced Injection-Molded Part

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