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由自然本身提供一種可再生的骨干了不起的聚合物。
伊士曼™醋酸丁酸纖維素（CAB -531- 1）是一種纖維素酯具有比伊士曼™ CAB- 381型酯更高丁酰基水平。堅(jiān)韌的薄膜擦傷性和耐候性好是可能通過的丁酸纖維素和熱塑性丙烯酸樹脂的組合。伊士曼™ CAB- 531 -1和CAB -381酯是類似的羥基含量和溶解度特性，在很寬范圍的溶劑均為水溶性的。伊士曼™ CAB - 531 - 1是一種更為靈活的樹脂要求較低的增塑劑改性比伊士曼™ CAB -381酯。伊士曼™纖維素酯是基于高達(dá)60 ％的纖維素，豐富的天然可再生資源之一。
物性表：| Property | Typical Value, Units | |||
| Butyryl Content | 50 wt % | |||
| Acetyl Content | 2.8 wt % | |||
| Hydroxyl Content | 1.7% | |||
| Viscosity a | 5.6 poise | |||
| Color b | 50 ppm | |||
| Haze b | 15 ppm | |||
| Acidity as Acetic Acid | 0.02 wt % | |||
| Ash Content | 0.05% | |||
| Refractive Index | 1.475 | |||
| Heat Test @ 160°C for 8 hr | Tan melt | |||
| Melting Point | 135-150°C | |||
| Glass Transition Temperature (Tg) | 115°C | |||
| Specific Gravity | 1.17 | |||
| Wt/Vol (Cast Film) | 1.17 kg/L (9.75 lb/gal) | |||
| Bulk Density | ||||
|
480 kg/m3 (30 lb/ft3 ) | |||
|
576 kg/m3 (36 lb/ft3 ) | |||
| Dielectric Strength | 787-984 kv/cm (2-2.5 kv/mil) | |||
| Molecular Weight c Mn | 40000 | |||
| Tukon Hardness | 15 Knoops | |||
| a Viscosity determined by ASTM Method D 1343. Results converted to poises (ASTM Method D 1343) using the solution density for Formula A as stated in ASTM Method D 817 (20% Cellulose ester, 72% acetone, 8% ethyl alcohol). b Determination of color and haze made on CAB solutions using Pt-Co standard (color) and a monodisperse latex suspension (haze). Analysis performed with a Gardner Model XL-835 colorimeter. c Polystyrene equivalent number average molecular weight determined by gel permeation chromatography. |
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