Tensile yield stress of polypropylene composites filled with ultrafine particles

Sumita, Masao; Tsukumo, Yasutoshi; Miyasaka, Keizo; Ishikawa, Kinzô

doi:10.1007/bf00542072

Cited by 141 publications

(92 citation statements)

References 11 publications

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“…The draw strain calculated from eq. (11) for filled PETG is plotted in Figure 11 using values of ad = 32.6 MPa, C: = 1.37, and Ed = 11.5 MPa. The draw strain of PETG should increase by about 7 and 20% for filler contents of 2.4 and 7.2 vol %, respectively.…”

Section: Draw Strainmentioning

confidence: 99%

Ductility of filled polymers

Баженов

Hiltner

et al. 1994

J of Applied Polymer Sci

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SYNOPSISThe ductility of a calcium carbonate-filled amorphous copolyester PETG in a uniaxial tensile test was examined as a function of the filler volume fraction. A ductile-to-quasibrittle transition occurred as the volume fraction of filler increased. This transition was from propagation of a stable neck through the entire gauge length of the specimen to fracture in the neck without propagation. The draw stress (lower yield stress) did not depend on the filler content and was equal to the draw stress of the unfilled polymer. It was therefore possible to use a simple model to predict the dependence of the fracture strain on the filler volume fraction. It was proposed that when the fracture strain decreases to the draw strain of the polymer the fracture mechanism changes and the fracture strain drops sharply. The critical filler content a t which the fracture mode changes is determined primarily by the degree of strain-hardening of the polymer.

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Section: Draw Strainmentioning

confidence: 99%

Ductility of filled polymers

Баженов

Hiltner

et al. 1994

J of Applied Polymer Sci

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“…The synthesis of expandable graphite (GIC) as well as graphene sheets is well documented in the literature [25][26][27]. Neat graphite (NG) is first converted to intercalated or expandable graphite through chemical oxidation in the presence of concentrated H 2 SO 4 or HNO 3 .…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of EG-Chitosan Nanocomposites via Direct Exfoliation: A Green Methodology

et al. 2015

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Abstract:In this study, free-standing expanded graphite chitosan (EG-chitosan) nanocomposite films have been prepared using a novel green and simple preparation method, starting from a commercial expandable graphite (GIC). The in situ exfoliation of GIC by a solvent-free sonication method was monitored as a function of the process parameters using X-ray diffraction (XRD), transmission electron microscopy (TEM), dynamic light scattering (DLS) and UV-visible transmittance (UV-VIS) analyses. The optimal process parameters were selected in order to obtain an efficient dispersion of EG in chitosan solutions. The effective EG amount after the in situ exfoliation was also determined by thermogravimetric analyses.

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“…Having noted that the smaller the particle size of dispersed filler for its fixed concentr~ttion the higher the strength of the composite, the authors of [90] show that, first, the strength of the composite with dispersed particles is lower than that of the matrix, and second, that the strength versus particle size curve gradually tends to a limit, that is, upwards of a certain size it stops being dependent on the effective particle diameter (d). However, in a series of studies Japanese investigators refuted these premature conclusions [138][139][140][141]. The authors studied the effect of ultra-dispersed filler on the yield strength ay of some thermoplastics.…”

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confidence: 98%

Filled polymers: Mechanical properties and processability

Enikolopyan

Fridman

Stal'nova

et al. 1990

Filled Polymers I Science and Technology

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In this review the wide spectrum of properties of filled polymer systems is generalized. Classical and modern conceptions dealing with the influence of the boundary layer and filler on melting and crystallization of the polymer matrix. Polymer properties in the melted and condensed state are considered, attention being given to the influence of the filler particle size and shape, the nature of its surface, its structure, and agglomeration on the theological and mechanical characteristics of composites.Data on structure and properties of filled thermoplastic composites are summarized for the first time. Special attention is paid to the peculiarities of composites with modified polymerized filler behavior during rheological and mechanical testing and processing of such composites. IntroductionPolymeric composite materials (PCM) belong to one of the most important classes of structural materials attracting ever growing interest, as manifested by the huge flow of published scientific and technical information dealing with the problems of developing, preparing, processing and using PCM [1]. Whereas the oil and gas fuel crisis has receded recently, the problem of their restrained use still remains an urgent one if only because the oil and gas reserves are not unlimited and practically non-reproducible. Estimates by specialists have shown [2,3] that the development of PCM with a view to cut the consumption of polymeric materials can only be economically feasible if not less than 15% by volume of the filler are added.Waste products from a number of commercial processes can be used as cheap and readily available fillers for PCM. For example, lightweight structural materials may be obtained by filling various low-viscous resins with waste materials [4,5]. Also by adding fillers to reprocessed polymers it is possible to improve their properties considerably and thus return them to service [6]. This method of waste utilization is not only economically feasible but also serves an ecological purpose, since it will help to protect the environment from contamination. The maximum percentage of the filler should in these cases be such as to assure reliable service of the article made from the PCM under specified conditions for a specified period of time.However, the chief purpose of introduction of fillers into PCM is to make possible the modification of polymers and thereby create materials with a prescribed set of physico-mechanical properties, and, obviously, the properties of filled materials may be controlled by, for example, varying the type of the base polymer (the "matrix") and filler, its particle size distribution and shape. It may not require a large quantity of filler [7]. Thanks to considerable advances in PCM research, their use in a broad range of industries -machine building, construction, aerospace technology, etc. -has become extensive [8][9][10][11].Development of an assortment of polymeric composite materials, decSsions concerning their possible scope of applicability and service conditions involve research in...

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Tensile yield stress of polypropylene composites filled with ultrafine particles

Cited by 141 publications

References 11 publications

Ductility of filled polymers

Ductility of filled polymers

Preparation and Characterization of EG-Chitosan Nanocomposites via Direct Exfoliation: A Green Methodology

Filled polymers: Mechanical properties and processability

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