Structure and Structural Variables

Polychloroprene is highly regular in structure and consists primarily of tra/w-units however, there are sufficient cw-units to disturb the backbone symmetry and maintain a rubbery state [6]. 

Therefore, the physical, chemical, and rheological properties of polychloroprene are, to a large extent, dependent on the ability to change the molecular strucmre. 

Polymerization conditions polymerization temperature, monomer conversion, polymerization process [7] 

Polymerization aids concentration and type of chain modifier, comonomers, and emulsifier [8] 

Using standard polymerization conditions, crystallization is an inherent property of all polychloroprene rubbers [12]. A homopolymer manufactured at 40°C has a trons-1,4-content of ca. 90%, a degree of crystallization of ca. 12%, and a crystalline melting temperature of ca. 45°C. A reduction in the rate of crystallization is possible 

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