Plastics major families

In the preceding sections, our discussion has been limited to softer grade elastomer-plastic vulcanizates. Commercial interest, however, also centers on another major family of polymer blends, semi-rigid impact resistant polyolefins. Thus, we report some of our findings on PRP triblock copolymer and EVA rubber blends without... 

Plastics are families of materials each with their own special advantages. The major consideration for a designer is to analyze what is required as regards to performances and develop a logical selection procedure from what is available. 

The market shares for the major families of plastics are estimated in Table 2.3 for industrialized countries however, other figures can be found in other sources according to the applications taken into account and the areas considered. 

Propellant Composition. In principle, any solid ingredient which is chemically compatible with nitrate esters can be introduced into the propellant by way of the casting powder. Any liquid ingredient used in the formulation must also be a plasticizer or co-plasticizer for nitrocellulose. In practice, three major families of compositions have been developed, differing in the composition of the casting powder (see Table I for typical compositions) ... 

Within these 20 popular plastics there are five major families of thermoplastics that consume about two-thirds of all thermoplastics. They are the low density polyethylenes (LDPEs), high density polyethylenes (HDPEs), polypropylenes (PPs), polystyrenes (PSs), and polyvinyl... 

Plastics are families of materials each with their own special advantages. An example is polyethylene (PE) with its many types include low density PE (LDPE), high density PE (HDPE), High molecular weight PE (HMWPE), etc. The major consideration for a designer and/or fabricator is to analyze what is required as regards to product performances and develop a logical selection procedure from what is available. 

The total tonnage of additives is conventionally about 18 percent of plastics production. If we include polymers added in making polymer blends, the total increases to about 25 percent. The major families of additives may be listed in order of total tonnage as follows ... 

Another important distinction is based on (1) filled and reinforced plastics, and (2) foams. (1) When any family of polymers is combined with particulate inorganic fillers, this produces major increase in density, modulus, dimensional stability, heat transfer, dielectric constant, and opacity, and frequently a decrease in cost. When the fillers are reinforcing fibers, they can further produce a great increase in strength, impact resistance, and dimensional stability. Thus, these properties may depend more upon the use of fillers and fibers, than upon the choice of the particular polymer in which they are used. 

Commercial plastic materials may conveniently be divided into five major classes. Commodity thermoplastics are families which are produced in volumes of a billion pounds or more per year. Engineering thermoplastics... 

Vinyls are one of the most versatile families of plastics. The term vinyl usually identifies the major very large production of polyvinyl chloride (PVC) plastics. The vinyl family, in addition to PVCs, consists of polyvinyl acetals, polyvinyl acetates, polyvinyl alcohols, polyvinyl carbazoles, polyvinyl chloride-acetates, and polyvinylidene chlorides. As a family, they are strong and abrasion resistant. They are unaffected, for the most part, by prolonged exposure to water, common chemicals,... 

In RIM, all necessary reactive ingredients are contained in two liquid components an isocyanate component and a resin component. The choice of isocyanate, as well as variations within isocyanate families, exerts a profound effect on the processing and final properties of the plastic. The chemical structures of two of the major diisocyanate types,... 

Examples of major plastic families Thermoplastic thermal properties are compared to aluminum and steel General properties of thermoplastic General properties of thermoset plastic General properties of reinforced thermoplastic General properties of reinforced thermoset plastic Examples of drying different plastics (courtesy of Spirex Corp.)... 

All the above is prolog to this publication. This new publication is divided into two major parts. Volume I deals with the many technology issues that impact the coloring of plastics today. Volume II will cover the major polymer families and deliver basic information on the coloring of those polymers. 

---