Poly , methyl substituted

Figure 9-1. Materials overview a few sclcclcd conjugated polymers and Ihcir properties have been compiled and ihe following abbreviations arc used DO-PPP...Poly(2-decyloxy-l,4-phcnylcnc), EHO-PPP...Poly(2-(2 -elhylliexyloxy)-l,4-phcnylenc), CN-PPP... Poly(2-(6 -cyano-6 -incthyl-licplyloxy)-l,4-phcnylene), m-LPPP... methyl-substituted ladder-type Poly( 1,4-phenylcne), and PLQY=phololuinincs-ecncc quanluni yield.

IUPAC recommendations suggest that a copolymer structure, in this case poly(methyl methacrylate-co-styrene) or copoly(methyl methacrylate/slyrene), should be represented as 1. The most substituted carbon of the configurational repeat unit should appear first. This same rule would apply to the copolymer segments shown in Section 7.1. However, as was mentioned in Chapter I, in this book, because of the focus on mechanism, we have adopted the more traditional depiction 2 which follows more readily from the polymerization mechanism. 

Aromatic-aliphatic hydroxy acids, poly esterification of, 81 Aromatic-aliphatic polyesters, 32-35, 83 melting points of, 36 structure and properties of, 44-47 synthesis of, 69-71, 103-106 unsubstituted and methyl-substituted, 36-38... 

The polymerization of methyl methacrylate produces poly(methyl methacrylate), an exceptionally clear plastic sold under the names Plexiglas or Lucite as a shatter-proof substitute for glass in windows, doors, and other glazing applications. 

Various substituted styrene-alkyl methacrylate block copolymers and all-acrylic block copolymers have been synthesized in a controlled fashion demonstrating predictable molecular weight and narrow molecular weight distributions. Table I depicts various poly (t-butylstyrene)-b-poly(t-butyl methacrylate) (PTBS-PTBMA) and poly(methyl methacrylate)-b-poly(t-butyl methacrylate) (PMMA-PTBMA) samples. In addition, all-acrylic block copolymers based on poly(2-ethylhexyl methacrylate)-b-poly(t-butyl methacrylate) have been recently synthesized and offer many unique possibilities due to the low glass transition temperature of PEHMA. In most cases, a range of 5-25 wt.% of alkyl methacrylate was incorporated into the block copolymer. This composition not only facilitated solubility during subsequent hydrolysis but also limited the maximum level of derived ionic functionality. 

G. Natta, G. Allegra, I. W. Bassi, C. Carlini, E. Chiellini, G. Montagnoli. Isomorphism phenomena in isotactic poly(4-methyl-substituted a-olefins) and in isotactic poly(alkyl vinyl ethers) , Macromolecules 2, 311 (1969). 

Table 10.5 gives the uses of acetone. A very important organic chemical that just missed the top 50 list, methyl methacrylate, is made from acetone, methanol, and hydrogen cyanide. Approximately 1.2 billion lb of this compound is manufactured and then polymerized to poly(methyl methacrylate), an important plastic known for its clarity and used as a glass substitute. The synthesis is outlined as follows. 

Figure 2. DSC trace of methyl-substituted poly(ester) with pentamethylene spacer, which displayed both smectic and nematic textures.

Methyl methacrylate is manufactured and then polymerized to poly(methyl methacrylate), an important plastic known for its clarity and used as a glass substitute. 

Noordermeer JaWM, Ferry JD, Nemoto N (1975) Viscoelastic properties of polymer solutions in high-viscosity solvents and limiting high-frequency behaviour. Ill Poly (2-substituted methyl acrylates). Macromolecules 8(5) 672-677 Okamoto H, Inoue T, Osaki K (1995) Viscoelasticity and birefringence of polyisobutylene. J Polym Sci B Polym Phys 33 1409-1416... 

Primary processes induced by ionizing radiation in the solution are excitation and ionization of the solvent molecules. Subsequent electron attachment to solute polymers leads to the formation of polymer anions. So far the radical anions of poly(methyl methacrylate) (PMMA) [46, 47], substituted PMMA [46, 47], poly(4-vinylbiphenyl) (PVB) [47-50], poly(l-vinylpyrene) (PVP) [50], organopolysilane [51] and substituted polyacetylene [52] have been studied. 

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