Plexiglas, structure

Glassy polymers, or glasses, are differentiated from rubbery polymers by their hard, rigid, glass-like structure [e.g., poly(methyl methacrylate) (PMMA) (i.e., Lucite , Plexiglas )] at room temperature. Rubbery polymers (e.g., polyethylene,... 

Polymers are macromolecules built of smaller units called monomers. The process by which they are formed is called polymerization. They may be synthetic (nylon, Teflon, and Plexiglas) or natural (such as the biopolymers starch, cellulose, proteins, DNA, and RNA). Homopolymers are made from a single monomer. Copolymers are made from two or more monomers. Polymers may be linear, branched, or cross-linked, depending on how the monomer units are arranged. These details of structure affect polymers properties. 

Fig. 9 Schematic view of a DSSR reactor showing the inner structure of the transparent structured box made of PLEXIGLAS (reproduced from [267] with permission from Elsevier BV)...

Draw the structure of poly(methyl methacrylate), a polymer used in Lucite and Plexiglas, and formed from radical polymerization of methyl methacrylate [CH2=C(CH3)COOCH3]. 

SAMPLE SOLUTION (a) Methacrylic acid is an industrial chemical used in the preparation of transparent plastics such as Lucite and Plexiglas. The carbon chain that includes both the carboxylic acid and the double bond is three carbon atoms in length. The compound is named as a derivative of propenolc acid. It is not necessary to locate the position of the double bond by number, as in "2-propenoic acid," because no other positions are structurally possible for it. The methyl group is at C-2, and so the correct systematic name for methacrylic acid is 2-methyl-propenoic acid. 

Equipment and structures balsa or pi tie blocks, hardwood dowels and molding, plywood, Lucite or plexiglas, polyurethane or polystyrene foam. 

Environmentally assisted cracking (EAC) occurs not only in metals but also in glasses (Plexiglas), ceramics, and polymers. Structural failures because of EAC can be sudden and unpredictable, occurring after a few hours of exposure or after months or years of satisfactory service (86, 87). The two types of environmentally assisted cracking (EAC) are mechanically assisted cracking and EIC. 

ACRONYM, TRADE NAMES PMMA, Plexiglas, Ludte CLASS VinyUdene polymers acrylics STRUCTURE -[CH2-C(CH3)(COOCH3)]... 

PMMA is the synthetic polymer of methyl methacrylate, which is widely known by a variety of trade names like Lucite, Oroglas, Perspex, Plexiglas, and so on. PMMA is a glassy polymer with an amorphous structure. It has a density of 1.19 g/cm and has very low water absorption. The refractive index ranges from 1.49 to 1.51 depending on the type. PMMA shows high... 

While a large number of acrylic polymers are manufactured, PMMA is by far the most common. The structure of PMMA is shown in Figure 7.68. Nearly everyone has heard of Plexiglas . PMMA has two very distinct properties that set the products... 

Poly(methyl methacrylate) is widely known as Plexiglas . The structural formula for the monomer, methyl methacrylate, is shown below. Write the corresponding... 

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