The effect of the transcrystalline layer on the mechanical properties of composite materials in the fibre direction

Nuriel, H.; Klein, N.; Marom, G.

doi:10.1016/s0266-3538(99)00026-3

Cited by 46 publications

(30 citation statements)

References 15 publications

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“…In a recent study on the Brill transition in transcrystalline nylon 66 we pointed out that the explanation for the effect of the crystalline structure on this first order transition must be based on the existence of reciprocal interactions between the crystalline and amorphous phases [14], which corresponded to the finding that structural changes within the crystalline domains in the lamellae (as in the Brill transition) are accompanied by changes in the packing of the amorphous chain segments outside the lamellae [15]. According to the scientific literature, nylon 66 exhibits three loss peaks, labeled α, β and γ (see e.g., [16][17][18]), representing different processes in the amorphous phase. Perhaps the only reference to an additional peak (shoulder) was made by Takayanagi in his study of nylon 6 [19].…”

Section: Introductionmentioning

confidence: 94%

Amorphous and crystalline phase interaction during the Brill transition in nylon 66

Wolanov¹,

Feldman²,

Harel³

et al. 2009

Express Polym. Lett.

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Abstract.A prominent α′ process in specifically treated nylon 66 and microcomposite samples is identified by dynamic mechanical analysis and proposed to be an amorphous phase counterpart of the Brill transition identified by synchrotron wide-angle X-ray diffraction (WAXD). It is suggested that this α′ process, which marks a critical free volume change and an onset of segmental chain movement in the amorphous phase, precedes and prompts the Brill transition in the crystalline phase.

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Section: Introductionmentioning

confidence: 94%

Amorphous and crystalline phase interaction during the Brill transition in nylon 66

Wolanov¹,

Feldman²,

Harel³

et al. 2009

Express Polym. Lett.

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“…The fiber is expected to nucleate crystallization on its surface and to induce a highly ordered transcrystallinity, which may result in improved mechanical properties of the composite material in the fiber direction. 19 Below, the transcrystallization ability of a pitch-based carbon fiber is compared with that of a polyacrylonitrile-based fiber. As indicated above, because OI-3 is soluble in NMP and therefore can be readily mixed with PAA, it becomes the material of choice for fiber preimpregnation in composite material manufacturing and its blend was studied with the carbon fibers.…”

Section: Effect Of Carbon Fibers On Recrystallizationmentioning

confidence: 99%

Semicrystalline polyimide matrices for composites: Crystallization and properties

Yudin

Светличный

Gubanova

et al. 2002

J of Applied Polymer Sci

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New semicrystalline polyimide/oligoimide blends, designated for matrices in carbon fiber-reinforced composites, were developed. A specific advantage of the proposed polyimides is their ability to crystallize from the melt, therein retaining their crystallinity throughout the manufacturing process. The generation of crystallinity after melting, referred to as recrystallization, was investigated here as affected by blending the polyimides with oligoimides of a similar chemical structure. Based on thermal analysis and enthalpy measurements, comparative X-ray diffraction analyses, and polarized light microscopy of hot-stage-controlled crystallization, the recrystallization ability was determined for five different oligoimides. In some cases, the addition of oligoimides, both amorphous and crystalline, resulted in complete recrystallization. The main contribution of the oligoimides is suggested to be through plasticization, allowing segmental chain mobility during crystallization, and not via nucleation. A similar effect was obtained by lowering the molecular weight of the polyimide; this, however, generates mechanical property reduction, rendering the polyimide irrelevant to composite materials. Finally, it was shown that crystallization was also enhanced by carbon fibers, serving as a nucleating agent and generating transcrystallization.

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“…This may enhance the reinforcing effect of the fibers in their axial direction. [21] Thus, the trans-crystalline morphology may play an important role in improving the mechanical properties, especially the tensile strength of the composites. Figure 5 depicts the tensile strength (s t ) and Young's modulus (E) of both NB and ISC injection-molded samples plotted against PET contents (f w ), respectively.…”

Section: Resultsmentioning

confidence: 99%

In‐Situ Fiberized Poly(ethylene terephthalate) as a Reinforcement to Poly(propylene) Matrix

Shen

Huang

Sheng-wu

2003

Macro Materials & Eng

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The reinforced poly(propylene) (PP)/poly(ethylene terephthalate) (PET) in‐situ fiberized composites were prepared by extrusion‐drawing‐injection molding. The influences of PET weight fraction (fw) on the PET fiberization, phase morphology, and mechanical properties of the composites, together with their functional mechanisms were studied by contrast to the normal‐blended materials without drawing. The results show that as the fw rises from 0 to 20%, the number of PET fibers increases, whereas their diameter and dispersity decrease till fw = 15% and then increase, and the number of remained PET particles tends to rise. These changes of PET fiberization and phase morphology with fw were attributed to the consequence of the combined actions of breakup, coalescence, and deformation of the PET dispersed phase in the PP matrix during the extrusion drawing. Correspondingly, the tensile strength (σt) and Young's modulus (E) of the in‐situ composites increase till fw = 15% and then decrease, with maximum gains of σt and E of about 20 and 70% relative to the neat PP, respectively. This σt/fw relation was ascribed to the counterbalanced result between the reinforcing effect of the dispersed phase on matrix and the interfacial flaw effect of two immiscible phases, while the E/fw relation was considered as a representation of the rigidizing effect of the fibers on the matrix being controlled by both their number and diameter.In‐situ PET fibres (PET/PP = 85/15) in an as‐drawn filament.magnified imageIn‐situ PET fibres (PET/PP = 85/15) in an as‐drawn filament.

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The effect of the transcrystalline layer on the mechanical properties of composite materials in the fibre direction

Cited by 46 publications

References 15 publications

Amorphous and crystalline phase interaction during the Brill transition in nylon 66

Amorphous and crystalline phase interaction during the Brill transition in nylon 66

Semicrystalline polyimide matrices for composites: Crystallization and properties

In‐Situ Fiberized Poly(ethylene terephthalate) as a Reinforcement to Poly(propylene) Matrix

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