Solid-state13C NMR of microscopic order in transcrystalline films of isotactic poly(propylene)

Hegemann, Hansjörg; Veeman, W. S.

doi:10.1002/(sici)1521-3935(19990601)200:6<1485::aid-macp1485>3.0.co;2-p

Cited by 5 publications

(3 citation statements)

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“…It can induce outstanding properties when adequately dispersed in polymeric matrix, such as rigidity increases without important losses in ductility, enhancement in electrical conductivity, nucleate crystallinity and thermal properties [8][9][10][11][12][13][14]. Unfortunately, carbon nanotubes have a trend of spontaneous aggregation because of their large surface area and high surface energy, which further limits their use [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Effect of multiwalled carbon nanotubes on the crystallization and dielectric properties of BP-PEN nanocomposites

Zheng

Yang

et al. 2014

J Mater Sci: Mater Electron

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In this work, polymer-based nanocomposite films formed from biphenol poly(arylene ether nitrile) (BP-PEN) and multiwalled carbon nanotubes (MWCNTs) were successfully prepared by the solution casting method combined with continuous ultrasonic dispersion technology. The micromorphology, thermal, mechanical and dielectric properties of the nanocomposite films were investigated in detail. Non-isothermal crystallization behavior studies indicate that the presence of MWCNTs enhances the crystallization of BP-PEN in the nanocomposites, which is consistent with the XRD analysis. Most importantly, it could be observed that the film containing 0.8 wt% MWCNTs reached the maximum crystallinity. Although, incorporation of MWCNTs did not obviously increase the mechanical of the films, all the nanocomposite films still exhibited excellent mechanical strength. The SEM micrographs of the nanocomposite films showed that the MWCNTs were uniformly coated by BP-PEN crystals, and indicating significantly improved nucleation ability of MWCNTs for polymer crystallization.

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Section: Introductionmentioning

confidence: 99%

Effect of multiwalled carbon nanotubes on the crystallization and dielectric properties of BP-PEN nanocomposites

Zheng

Yang

et al. 2014

J Mater Sci: Mater Electron

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“…Carbon fibers, which are closely related to carbon nanotubes, can nucleate crystallinity in isotactic polypropylene. [3][4][5][6][7][8][9] This nucleating ability leads to transcrystallization, which is a region of highly oriented crystalline material with the c-axis parallel to the fiber surface at regions very close to the fiber surface. 10 This orientation is a result of very dense nucleation on the fiber, which consequently restricts crystal growth in the direction normal to the fiber.…”

Section: Introductionmentioning

confidence: 99%

Nucleation of Polypropylene Crystallization by Single-Walled Carbon Nanotubes

et al. 2002

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Nonisothermal and isothermal crystallization experiments were performed on polypropylene mixed with carbon nanotubes produced by disproportionation of CO on Co−Mo catalysts. Functionalization of the nanotubes with octadecylamine made the tubes hydrophobic and allowed the tubes to be solubilized in an organic solvent. Mixing of the nanotubes with the polymer was accomplished by adding the nanotubes to a Decalin solution that contained dissolved polypropylene, followed by evaporation of the solvent. Dynamic mechanical analysis indicated very little difference in the small-strain mechanical properties between filled and unfilled polymers at the very low solid levels that were tested. By contrast, the crystallization behavior of the filled and unfilled polymer was quite different. Nanotubes promoted growth of the less-preferred beta form of crystalline polypropylene at the expense of the alpha form. In nonisothermal crystallization, the total amount of crystalline material in the sample was the same for the filled and unfilled materials. However, for isothermal crystallization experiments, the percent crystallinity in the filled materials was slightly higher. Most importantly, the rate of crystallization was substantially higher in the filled system. The results presented in this paper clearly show that carbon nanotubes nucleate crystallinity in polypropylene.

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“…Use of rotor synchronized experiments demonstrated that both hard and soft segments are well oriented (155). Studies of oriented polyamide fibers (156) and of orientation in films of isotractic poly(propylene) (157) have been reported. Similar experiments have also been used to study uniaxially drawn poly(ethylene terephthalate) (158), poly(ethylene isophthalate).…”

Section: Synthetic Polymersmentioning

confidence: 99%

%Solid-State Nuclear Magnetic Resonance

Dybowski

Bai

2000

Anal. Chem.

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Review Contents Scope1R Reviews 1R Instrumentation and Theory 1R Tensors of Spins 1 /2 2R Quadrupolar Nuclei 2R Solid Materials Properties 3R Porous Materials and Catalysis 3R Synthetic Polymers 4R Biological Solids 4R Conclusions 5R Literature Cited 5R SCOPEThis review focuses on developments and applications in the field of nuclear magnetic resonance of solids appearing in the literature between October 1997 and October 1999. Applications of NMR spectroscopy to liquids and solutions are not included. With each year, more and more papers on the magnetic resonance of solids from more and more research laboratories appear in the literature, so even covering the developments in that restricted field is difficult. A choice has to be made about what to include and what not to include, necessarily a subjective task. The comments and references below represent only a single view of a tremendously vibrant field. In particular, we may often give a reference to one of a number articles on similar systems as representative of a particular problem addressed with NMR spectroscopy. This review is meant to point the reader to areas and the kinds of research in those areas rather than enumerate all articles on a particular substance. Further literature research will usually be necessary to delve into a particular area or into uses of NMR on a particular system.

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Solid-state13C NMR of microscopic order in transcrystalline films of isotactic poly(propylene)

Cited by 5 publications

References 0 publications

Effect of multiwalled carbon nanotubes on the crystallization and dielectric properties of BP-PEN nanocomposites

Effect of multiwalled carbon nanotubes on the crystallization and dielectric properties of BP-PEN nanocomposites

Nucleation of Polypropylene Crystallization by Single-Walled Carbon Nanotubes

%Solid-State Nuclear Magnetic Resonance

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