Composites self-reinforced

Comfil ApS (2011) Comfil Thermoplastic Composites - Self-Reinforced Plastics http // www.comfil.biz/products/srp.php (wehpage accessed onhne 08.04.11). 

The macroscopic orientation of their extended-chain crystals depends on the orientation imparted by flow during mol ding. Because of the fibrous nature of the extended-chain crystals, these materials behave as self-reinforcing composites, with excellent mechanical properties. 

Recycling more effective solutions are sought. The development of the mono-material concept is favourable to thermoplastics and self-reinforcing thermoplastic composites such as self-reinforced polypropylene (Curv from BP). 

Rossignol, F., Goursat, P. and Besson, J.L. Microstructure and mechanical behaviour of self-reinforced Si3N4 and Si3N4-SiC whisker composites , J. Eur. Ceram. Soc., 13 (1994) 299-312. 

RPs that combine two different materials (plastic matrix and reinforcement) are a separate major and important segment in the plastic industry. They are also called plastic composites and composites. There are also self-reinforcing plastics such as liquid crystal polymers (Chapter 1) and others.301 It is a fact that RPs have not come near to realizing their great potential in a multitude of applications usually due to cost limitations that particularly involves the use of expensive fiber reinforcements (carbon, graphite, silica, etc.).1 Information on thermoplastic and thermoset plastic RPs are reviewed in Chapter 15. 

A number of thermotropic polyester-carbonates were prepared through melt-polymerization of substituted hydroquinones and diphenyl tere-phthalate and diphenyl carbonate to have high molecular weight, with reduced viscosity in the range of 2-3. The molecular weights of the polymers can be advanced further by solid state heat-treatment, with the rate of postpolymerization depending on temperature and Concentration of catalyst. Samples of some compositions can be spun into high performance fibers and processed into self-reinforced plastics. The properties of thermotropic polyester-carbonates and polyesters were compared as fibers and plastics. 

Toughening of the ceramic matrix (A) by controlling the micromorphology of the matrix itself (self-reinforced ceramics). The process requires that an initial composition (A) form a liquid or solid solution (A ) from which phases with different morphologies than those existing in A and A1 are grown ... 

Xu YD, Cheng LF, Zhang LT, Luo XT, Zhou WC (1999) Preparation and mechanical properties of self-reinforced in situ Si3N4 composite with La203 and Y203 additives. Composites A30 945-950... 

C3 + D3) Molding of self-reinforced polymers — No (unsolved process for molecular composites) ... 

A new high impact blend of PET and polybutene (Valox CT) is also available. - The melt viscosity of blends of PET and nylon-66 has been reduced by the addition of polyvinyl alcohol. Self reinforcing PET has been produced by the addition of p-hydroxybenzoic acid which forms liquid crystals in the composite. 

Tm etc. for the mesophase transitions and by Ti for the transition to an isotropic melt. The presence of such a mesophase (for mainchain LCP systems usually a nematic one) offers the possibility to use these polymers as a reinforcing fibre phase in so-called self-reinforcing composite systems. 

The additional chain orientation in the direction of the fiber long axis, obtained from the nematic self-ordering in the system, leads to a dramatic enhancement of the mechanical properties of the polymer. A number of aromatic polyamides have thus achieved commercial importance because of the very high tensile strengths and moduli of the fibers that can be spun from the nematic solutions. These have consequently become attractive alternatives to metal or carbon fiber for use in composites as reinforcing material. The most significant of these aramid fibers are ... 

Although composites are a very important class of polymeric materials they form a separate subject in their own right, in which it is necessary to assume an understanding of the properties both of the polymer matrix and of the reinforcing material. They are not discussed further in this book, but it is interesting to note that in some ways semi-crystalline polymers can be considered as self-reinforcing polymers, because the mechanical properties of the crystalline parts are different from those of the non-crystalline parts, which often effectively form a matrix in which the crystals are embedded. 

Self-reinforced PP is an intriguing avenue for creating a more recyclable, single-polymer, reinforced material. Such a composite system is reinforced by oriented, drawn PP fibers within a PP matrix, or as part of a laminated system. However, current cost disadvantages have limited their use [7-42]. 

Gilbert, J. L., Ney, D. S. Lautenschlager, E. P. (1995) Self-reinforced composite poly(methyl methacrylate) — static and fatigue properties. Biomaterials, 16, 1043— 1055. 

Aurrekoetxea J. Sarrionandia M. Mateos M Aretxabaleta L. (2011) Repeated low energy impact behaviour of self-reinforced polypropylene composites. Polymer testing. Vol.30, Issue. 2, pp. 216-221. 

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