Importance of Plastics

In addition to functionality, skeletal structure and the physical make-up of the coal was found to be important in achieving high conversions at short time. Neavel has previously called attention to the importance of plasticity in coal liquefaction... 

B. Qian and C. G. Gogos, The Importance of Plastic Energy Dissipation (PED) to the Heating and Melting of Polymer Particulates in Intermeshing Co-rotating Twin Screw Extruders, Adv. Polym. Tech., 19, 287-299 (2000). 

The importance of plastics is attested by the abundance of scientific and technical literature on the subject. For several reasons the following discussion on the manufacture, structure and properties of plastics is necessarily a brief introduction to the subject as found in the literature ... 

The analysis of the deformational behaviour of linear polymers allows us to understand the importance of plasticity in fracture behaviour of the glassy state. The same result is valid for the network glasses considered. Fracture processes in glassy polymers of epoxy-aromatic amines type were investigated in Refs. 87and64). The main results of the investigations can be summarized as follows ... 

U.S. Exports Imports of Plastics Plastics Products 2005-lst Quarter 2010 31... 

Japan s Exports and Imports of Plastics/Rubber Processing Equipment, PN, Feb. 24, 2003. 

Mandatory registration for producers and importers of plastics, ceramics, glass and regenerated cellulose... 

The importance for society of the series of alkenes is that they are the major starting point for polymers and plastics. Look around where you are now, and notice the importance of plastics and polymers to you. Pens, clothing, carpets, packaging, coatings for wires, shoes, furniture, curtains and fabrics. 

Powders, Suspensions, and Emulsions - One of the most signi-ficant articles in recent years is that by Hiestand on particle-particle interaction in powders. The author has brought together much information from pharmaceutical research and from other disciplines and has perspectively assembled a rational treatise. The importance of plasticity and the true area of contact is clearly described. In addition, several novel methods for evaluating cohesion and adhesion of powder particles are described in this paper. 

The information given here for copolymers is much less material specific than it is for homopolymers because copolymers have a wide variety of chemical compositions and stmctures. The information is intended to show the importance of plasticizers in copolymers. Examples given also include some novel polymeric plasticizers that are copolymers themselves. 

The above list created on the basis of experimental findings and products development shows importance of plasticizers for the properties of materials manufactured from PVC. These effects are discussed in many parts of this book and their importance for some groups of products are discussed in Chapter 13. The above list may be frequently consulted to evaluate potential changes in material caused by plasticizer addition (also in the case of other polymers). 

The Position and Importance of Plastics Recycling in Sustainable Development... 

CM is the most common method of forming TS plastics. Until the advent of injection molding, it was the most important of plastic processes. CM is the compressing of a material into a desired shape by application of heat and pressure to the material in a mold cavity. Pressure is usually at 7 to 14 MPa (1000 to 2000 psi). Some TSs may require pressures down to 345 kPa (50 psi) or even just contact (zero pressure). The majority of TS compounds are heated to about 150 to 200°C (302 to 392°F) for optimum cure but can go as high as 650°C (1200°F). 

With the growing importance of plastics, more and more industrial processes involve extrusion of polymer melts through dies of complex cross section to form the final product. The shape of these dies and the pressure losses through them are important factors in preventing flow defects and controlling the quality of the end product. Attempts at predictions of extrusion pressure losses in dies of complex cross-sectional geometries are those of Lenk [45-47], White and Huang [48], Tiu [49], and Shenoy and Saini [50]. 

Plasticization does not create chemicil bonds. Within the polymer matrix, the plasticizer must be able to move to be effective, for if the plasticizer molecules are attached to the polymer, the ability to plasticize is greatly diminished. The importance of plasticizer mobility is illustrated by the work by... 

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