Ethylene dichloride, physical properties

Table 7.3 displays key physical properties of the main components. Large differences in the physical state may be observed. Ethylene and HC1 are gases, chlorine and VCM may be handled as liquids at lower temperatures and adequate pressure, while ethylene-dichloride is a liquid. Therefore, the use of higher pressures and lower temperatures is expected in various processing steps. 

PHYSICAL PROPERTIES White crystalline substance when pure, yellowish in commercial form odorless when pure, pungent odor in commercial grade insoluble in water slightly soluble in ethylene dichloride and chloroform soluble in acetone, benzene and toluene MP(178°C) BP (decomposes) DN (1.5 g/Ml) SG (1.74) VP (lE mm Hg at 25°C). 

PHYSICAL PROPERTIES white solid, characterized by four sided, pointed prisms mild, chlorine-like odor turns brown at 212°C (413.6°F), after melting at 132 C (269.6°F) slightly soluble in water freely soluble in chlorinated and highly polar solvents at 25 C, including benzene, chloroform, ethylene dichloride, carbon tetrachloride, methylene chloride, sym-tetrachlorethane, and alcohol MP (132 C, 270 F) BP (unknown) DN (1.5 g/cm at 20°C) SG (1.5) VD (6.8) VP (unknown). 

Hanlon (1966) has presented spectra for poly-y-benzyl-L-glutamate in systems of varying solvent composition of dichloroacetic acid and ethylene dichloride. The 1.51 /i band indicates protonation of the peptide residues. Poly-y-benzyl-L-glutamate exhibits a unique protonation pattern characterized by two transition regions one at low concentrations of acid, and the other between concentrations of 75 % and 80% acid only the latter transition can be reversed by an increase in temperature within the range 11 to 55 C. This unique protonation pattern parallels that found with measurements of other physical properties of poly-y-benzyl-L-glutamate in this solvent system. 

Thermoplastic polyesters have similar physical properties to nylon 66 but have much lower moisture absorption. They are attacked by ethylene dichloride and is susceptible to hydrolysis in prolonged contact with hot water. 

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