Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Microfibril-reinforced composites MFC

Taking into account some of the basic requirements for the scaffolds, for example, the high specific surface, which can be achieved using fibrillar and/or porous materials, it seemed challenging to apply for their manufacturing, the concept of microfibrils-reinforced composites (MFCs), [12-21]. [Pg.219]

Microfibril-reinforced composite (MFC), PET/LDPE (50/50), fracture surfaces [5] ... [Pg.477]

Recently, it has been shown that these problems could be overcome by applying the microfibril reinforced composites (MFC) concept, starting from polymer blends [63-74]. The MFC use thermodynamically immiscible polymers with different (at least 30°C) melting temperatures (T ,). [Pg.204]

A new type of composite material starting from polymer blends has been developed. Due to the fact that the reinforcing elements are the basic morphological entities of oriented polymers, the microfibrils, these new composites have been named microfibrillar-reinforced composites (MFC) (Evstatiev Fakirov, 1992). MFC, however, clearly differ from traditional composite systems. Since the microfibrils are not available as a separate component, the classical approach to composite preparation is inappropriate for MFC mannfactnring. [Pg.165]

The result of the described process is a microfibril-reinforced composite material with mechanical properties superior to those of the plain matrix polymer [17]. It should be noted that variations in the MFC manufacturing process do exist [ 17]. [Pg.220]

This relatively new type of composite material constitutes a novel breed of thermoplastic polymer composite. MFCs originated when the concept of attempting to reinforce one type of polymer with another was combined with that of strengthening a polymer through drawing. This work culminated in the creation of microfibril reinforced composites in the early 1990s, which was soon followed by the development of the continuous manufacturing process used today [2,3]. [Pg.590]

With the correct selection of constituent polymers, MFCs appear well suited to this last technique of barrier improvement due to their in situ microfibrils. However, beyond that applied to standard polymer blends, the literature to date reveals no work in the area of gas permeation through microfibril reinforced composites. [Pg.595]

The creation of a dispersion morphology through in situ fibril generation is central to the formation of a microfibril reinforced composite. What is more, this dispersion methodology is also one of the principal methods of barrier property enhancement in many polymer films and membranes. Therefore, it was anticipated that MFCs would be inherently suited to applications in which reduced gas permeability of the matrix polymer was required. [Pg.595]

A new type of polymer-polymer composites, the microfibrillar reinforced composites (MFC) from thermoplastic polymer blends, was created about ten years ago. Unlike the classical macro-composites e.g., glass fiber-reinforced ones) and the in situ composites (TLCP rod-like macromolecules and mostly their aggregates as reinforcing elements), the MFC are reinforced by microfibrils of flexible chains. The microfibrils are created during the MFC manufacturing. [Pg.150]

Again, similarly to the case of PP/PET, the good reinforcing effect of the PET microfibrils is illustrated in the best way by a comparison of the mechanical properties of the isotropic neat PE (compression molded) and those of MFCs based on the PE/PET blend. A difference in favor of MFCs for cr (sevenfold) and for E (more than fourfold) can be found [45]. Comparing the MFC system with short GF-reinforced (30 wt%) PE, one can draw the important conclusion that the MFC from PE/PET has threefold higher tensile strength, whereas its E-modulus is only lower by 20% [45]. As far as the deformation ability is concerned, the polymer-polymer composite has a e-value of about 80%, while the GF-reinforced PE breaks already at about 5% [91]. [Pg.372]

What could be the reason for these superior mechanical properties of MFCs prepared from blends of condensation polymers and polyolefins It could hardly be the same as in the case of blends of condensation polymers the perfect adhesion between matrix and reinforcing microfibrils are due to the formation of chemical bonds between them as outlined above. Neither could it be related to a better aspect ratio of the reinforcement, since the sizes of microfibrils do not depend that strongly on the chemical composition of the blend. [Pg.373]

It is generally accepted [16] that the mechanical properties of the MFC, with optimized composition made under best processing conditions, are superior to those of the corresponding neat matrix material due to the high aspect ratio (AR) of the crystalline and oriented microfibrillar reinforcement, and in view of the various possibilities to strengthen the matrix-fibril interface by compatibilization or transcrystallization. All of the systematic mechanical studies on MFC were made with systems based on polyolefin matrices reinforced by PET microfibrils and no such studies are available for PE/PA MFC systems. [Pg.472]

MFCs are polymer composites in which the reinforcing elements are high performance polymer microfibrils that have been created during the manufacturing process and dispersed throughout a lower strength polymer matrix. These microfibrils improve many of the mechanical properties of the base polymer. [Pg.590]

A. N. Nakagaito, A. Fujimura, T. Sakai, Y. Hama, H. Yano. Production of Microfibrillated cellulose (MFC)-reinforced polylactic acid (PLA) nanocomposites from sheets obtained by a papermaking-like process. Composites Science and Technology 2009 69 1293-1297. [Pg.122]


See other pages where Microfibril-reinforced composites MFC is mentioned: [Pg.355]    [Pg.589]    [Pg.467]    [Pg.355]    [Pg.589]    [Pg.467]    [Pg.168]    [Pg.595]    [Pg.182]    [Pg.525]    [Pg.592]    [Pg.614]    [Pg.700]    [Pg.418]    [Pg.8]    [Pg.164]    [Pg.165]    [Pg.25]    [Pg.26]    [Pg.28]    [Pg.220]    [Pg.442]    [Pg.205]    [Pg.363]    [Pg.366]    [Pg.526]    [Pg.538]    [Pg.539]    [Pg.539]    [Pg.614]    [Pg.246]    [Pg.207]    [Pg.218]    [Pg.151]    [Pg.421]   
See also in sourсe #XX -- [ Pg.467 , Pg.477 ]




SEARCH



MFCs

Microfibril

Microfibril-reinforced composites

Microfibrillation

Microfibrils

© 2024 chempedia.info