Crystallization of R-BAPB type polyimide modified by carbon nano-particles

Yudin, V. E.; Feldman, Alexander Y.; Светличный, В. М.; Shumakov, A. N.; Marom, G.

doi:10.1016/j.compscitech.2006.01.038

Cited by 43 publications

(52 citation statements)

References 16 publications

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“…One of the parameters which these nanollers differ is the surface curvature, the CNT diameter was 15-20 nm and the nanober diameter was about 150 nm. 17 At the same time the surface structures of the VGCF and CNT are not identical because of the non-total graphitization of the bers. This difference in structure makes it difficult to conclude univalently that the nanoller surface curvature is the only factor impacting the crystallization rate observed experimentally.…”

Section: A Introductionmentioning

confidence: 99%

“…Yudin et al 17,[23][24][25]29 investigated the crystallization initiation of the semicrystalline thermoplastic polyimide R-BAPB based on dianhydride 1,3-bis-(3 0 ,4-dicarboxyphenoxy)-benzene (dianhydride R) and 4,4 0 -bis-(4 00 -aminophenoxy)-diphenyl (diamine BAPB) in the composites with different nanollers. In particular, the authors have demonstrated that vapor grown carbon nanobers (VGCF) are twice as efficient in accelerating the crystalline formation as CNT.…”

Section: A Introductionmentioning

confidence: 99%

“…4,7,9,[11][12][13][14][15][16][17] Polymers with a relatively simple or complicated molecular structure have been and are currently used as matrices in nanocomposite materials.…”

Section: A Introductionmentioning

confidence: 99%

“…4, [17][18][19] By combining different types of matrices and nanollers, it is possible to obtain composites with a wide range of physical properties. In some cases, a nanoller can initiate the crystallization of the polymer matrix, 18,[20][21][22][23][24][25] signicantly accelerating the formation of crystallites, or even initiating their formation in the polymer under conditions which do not normally favor the crystallization, as in the case of ODPA-P3 polyimide.…”

Section: A Introductionmentioning

confidence: 99%

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Influence of the carbon nanofiller surface curvature on the initiation of crystallization in thermoplastic polymers

et al. 2014

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Experimental results have shown that graphitizated carbon nanofibers initiate crystallization in R-BAPB polyimides twice as fast as single-wall carbon nanotubes (CNT) leading to the hypothesis that nanofiller curvature influences polyimide crystallization. Therefore, atomistic molecular-dynamics simulations have been performed for R-BAPB in the presence of a flat graphene sheet and the results were compared with those obtained in the presence of a small-radius CNT. The polyimide chain segments tend to lie parallel to the nanofiller surface and this tendency is stronger and the segments are closer to the graphene surface than to the CNT one. Moreover, the density of the polyimide in the near-surface layer is higher for composites filled with graphene than with CNT. This confirms the assumption that the nanofiller surface curvature is indeed a factor influencing the polymer patterning structure, and that a smaller curvature (i.e. flat surface) provides an enhanced initiation of polymer ordering. A IntroductionOne of the most promising ways to improve the performance of polymeric materials consists of developing polymer composites.1-3 Signicant changes aer addition of a ller are inuenced by the polymer and ller properties, but also by the interface interactions between both components. The use of nanoscalereinforcing llers leading to a considerable increase in the interaction area between the composite components has driven the interest of researchers in last years.4-11 Allotropic carbon compounds (carbon black, fullerenes, single-and multiwall nanotubes, nanobers and graphene sheets) are among the popular nanollers. 4,7,9,[11][12][13][14][15][16][17] Polymers with a relatively simple or complicated molecular structure have been and are currently used as matrices in nanocomposite materials. 4,[17][18][19] By combining different types of matrices and nanollers, it is possible to obtain composites with a wide range of physical properties. In some cases, a nanoller can initiate the crystallization of the polymer matrix, 18,20-25 signicantly accelerating the formation of crystallites, or even initiating their formation in the polymer under conditions which do not normally favor the crystallization, as in the case of ODPA-P3 polyimide.26 Crystallization of a polymer matrix in a nanocomposite may signicantly impact its mechanical and thermophysical properties, which should be taken into account when developing new composite materials.18,27,28 The advantage of using nanoparticles for initiation of crystallization is that the formation of a large number of nanoscale crystallites improves the strength of the nanocomposite preventing the typical failure on the boundary area between crystalline regions, thus improving the performance of the material. Therefore, the question arises on how the physical properties of carbon nanollers affect the initiation of crystallization in semicrystalline thermoplastic matrices.Yudin et al. 17,[23][24][25]29 investigated the crystallization initiation of the semicrystalline ther...

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Section: A Introductionmentioning

confidence: 99%

Section: A Introductionmentioning

confidence: 99%

“…4,7,9,[11][12][13][14][15][16][17] Polymers with a relatively simple or complicated molecular structure have been and are currently used as matrices in nanocomposite materials.…”

Section: A Introductionmentioning

confidence: 99%

Section: A Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of the carbon nanofiller surface curvature on the initiation of crystallization in thermoplastic polymers

et al. 2014

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“…For some years [5][6][7][8][9][10] we have been researching thermoplastic PI based on 1,3-bis-(3,3′,4,4′-dicarboxyphenoxy)benzene (R) and 4,4′-bis-(4-aminophenoxy)disphenyl (ODFO) for use as binders for carbon plastics:…”

mentioning

confidence: 99%

Production, structure, and mechanical properties of carbon plastics based on a crystallizing polyimide matrix modified by carbon nanofibers

et al. 2008

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Carbon-fiber composites have been made under laboratory conditions on the basis of partially crystallized polyimide (PI) matrices of R-ODFO type as modified by carbon nanofibers of VGCF type. The R-ODFO matrix is modified by nanofibers in an amount of 3 mass %, which leads to the following: firstly, an approximately tenfold reduction in the time for the crystallization of the PI matrix, and secondly, the viscosity of interlayer failure in the carbon plastic (for fibers Elur-0.08P) on the basis of the R-ODFO/VGCF composite is maintained at the fairly high level of about 1100 J/m 2 even with a high degree of crystallinity (about 40%) in the PI matrix, which cannot be done for the unmodified R-ODFO matrix. Triple composite can be made from a PI matrix, carbon microfibers of Elur type (volume content about 55%) and VGCF nanofibers (weight content in PI matrix about 3%), which provides a heat-resisting carbon plastic with a fairly high viscosity for interlayer failure.Polyimides (PI) are amongst the most effective polymers for electronics and aerospace research because of their good thermal and mechanical characteristics, as well as their radiation and chemical stability [1]. Particular interest attaches to PI capable of crystallizing from a melt, since additional advantages come from the crystalline structure such as elevated thermal stability and resistance to water and alkalis [2][3][4]. They are very promising as binders for fibrous composites, in particular carbon plastics (CP).For some years [5-10] we have been researching thermoplastic PI based on 1,3-bis-(3,3′,4,4′-dicarboxyphenoxy)benzene (R) and 4,4′-bis-(4-aminophenoxy)disphenyl (ODFO) for use as binders for carbon plastics:These R-ODFO binders have advantages over other partially crystalline PI [2][3][4] in the low melting point of T mp ≈ 320°C (vitrification temperature T v ≈ 204°C). The melt has the comparatively low viscosity η ≈ 10 3 Pa.sec at 340°C, which allows one to work such PI into composite matrices at temperatures reasonably far from the temperature at which thermal destruction of R-ODFO starts (about 450°C).The crystallization of the R-ODFO matrix after melting can be accelerated by modifying it with bis-imides of chemical structure similar to that of the PI itself, which is explained by the plastification effect, which increases the molecular mobility of the PI and correspondingly the capacity to crystallize [5][6][7].Macromolecular Compounds Institute, Russian Academy of Sciences.

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Effects of Carbon Nanotubes on Polymer Physics

2011

Carbon Nanotube–Polymer Composites

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Crystallization of R-BAPB type polyimide modified by carbon nano-particles

Cited by 43 publications

References 16 publications

Influence of the carbon nanofiller surface curvature on the initiation of crystallization in thermoplastic polymers

Influence of the carbon nanofiller surface curvature on the initiation of crystallization in thermoplastic polymers

Production, structure, and mechanical properties of carbon plastics based on a crystallizing polyimide matrix modified by carbon nanofibers

Effects of Carbon Nanotubes on Polymer Physics

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