Technical information
Table 1 shows the cellulose acetate varieties, and Table 2 shows those general properties.
The acetyl value is an index indicating the degree of substitution, and indicates the percentage of acetic acid is released from cellulose acetate by saponification. Figure 1 shows relationship between acetyl value and degree of substitution. The 6% viscosity is used as a measure of the degree of polymerization, the higher its value, the higher the degree of polymerization. Figure 2 shows relationship between degree of polymerization and 6% viscosity.
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Table 1. Production items of cellulose acetate and their general properties
Production item Acetylation degree (%) 6% viscosity
(10-3Pa·s)L-50 55 110 LT-35 61 95 LT-105 61 275 Table 2. General physical properties of cellulose acetate
Item Property Unit Shape White and flaky Specific gravity (25/4°C) 1.33 to 1.36 - Bulk density 0.25 to 0.52 kg/l Glass transition temperature 160〜180 ℃ Melting point 230〜300 ℃ Specific heat 1.34 kJ/kg·K -
Fig. 1. Relationship between acetyl value and degree of substitution
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Fig. 2. Relationship between degree of polymerization and 6% viscosity
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