Properties of Stereoregular Polymers

Physical Properties. Table 3 Hsts physical properties of stereoregular polymers of several higher a-olefins. Crystal ceU parameters of these polymers ate available (34—36). AU. stereoregular polyolefins have helix conformations ia the crystalline state. Their densities usually range from 0.90 to 0.95 g/cm. Crystalline PMP, however, represents an exception its density is only 0.812—0.815 g/cm, lower even than that of amorphous PMP (0.835—0.840 g/cm ), thus making it one of the lowest densities among plastics. 

Corradini P, Guerra G, Pirozzi B (1980) in Lenz RV, Ciardelli F (ed) Preparation and properties of stereoregular polymers, Reidel, Dordrecht, p 317... 

The most relevant property of stereoregular polymers is their ability to crystallize. This fact became evident through the work of Natta and his school, as the result of the simultaneous development of new synthetic methods and of extensive stractural investigations. Previously, the presence of crystalline order had been ascertained only in a few natural polymers (cellulose, natural rubber, bal-ata, etc.) and in synthetic polymers devoid of stereogenic centers (polyethylene, polytetrafluoroethylene, polyamids, polyesters, etc.). After the pioneering work of Meyer and Mark (70), important theoretical and experimental contributions to the study of crystalline polymers were made by Bunn (159-161), who predicted the most probable chain conformation of linear polymers and determined the crystalline structure of several macromolecular compounds. 

Preparation and Properties of Stereoregular Polymers Lenz, R. W. Ciardelli, F., Eds. Reidel Dordrecht, 1979. 

III. Contribution given by the research on optically active addition polymers to the knowledge of the synthesis and properties of stereoregular polymers... 

Physical Properties. Table 7 lists physical properties of stereoregular polymers of several higher or-olefins. 

NATO Advanced Study Institute. Advances in the Preparation and Properties of Stereoregular Polymers. (Tirrenia, Italy October 1978). Dordrecht Reldel Publishing Company. 

An extended formalism and computational procedure for saturated and conjugated systems. " A general formula was employed to compute electronic properties of stereoregular polymers by using FSGO fragment approach (see section 4-A). 

PHYSICAL PROPERTIES OF STEREOREGULAR POLYMERS IN THE SOLID STATE. 

Pino, P, and Lorenzi, G. E, in Preparation and Properties of Stereoregular Polymers, Reidel, Amsterdam, Holland, 1980, p. 21. 

R. W, Lenz and F, Ciardelli (eds.), Preparation and Properties of Stereoregular Polymers, Copyright 1979 by D. Reidel Publishing Company. 

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