TABLE OF CONTENTS Tosi and Simonazzi [1] have described an infrared method for the evaluation of the propylene content of ethylene-rich, ethylene-propylene copolymers. This is based on the ratio between the absorbance of the 7.25 ?m band and the product of the absorbances by the half width of the 6.85 ?m band obtained on diecast polymer film at 160 C (Table 4.1).
| Sample | C 3 (wt%) [a] | A 7.25 /A 6.85 |
|---|---|---|
| 3137-25 | 40.5 | 0.652 0.011 |
| 3629-48 | 32.9 | 0.561 0.053 |
| 3629-44 | 32.0 | 0.548 0.032 |
| 3137-38 | 30.7 | 0.606 0.024 [b] |
| 3137-31 | 20.7 | 0.416 0.018 |
| 3297-55 | 18.2 | 0.365 0.037 |
| 3297-59 | 18.0 | 0.357 0.015 |
| 3274-53 | 14.2 | 0.318 0.015 |
| Blend No. 1 | 11.0 | 0.315 0.022 |
| Blend No. 2 | 6.0 | 0.204 0.013 |
| Polyethylene | 6.0 | 0.036 0.007 |
| Reproduced with permission from G. Tosi and T. Simonazzi, Die Angewandte Macromolecular Chemie, 1973, 32, 1, 153 [1 ] | ||
| [a] Radiochemical analysis [b] The standard deviation has been multiplied by the Student s t 95% coefficient to the number of replications (on average 5) for each calibration point. |
Other infrared methods for...
