Abstract
A model for heterogeneous nucleation of isotactic polypropylene in terms of a "cylindrical cap" with the critical size and barrier set by a contact angle is described. Quiescent crystallization data for bulk samples of isotactic polypropylene are analyzed to extract a contact angle in the range of 40 to 70 with a mean value of 56, which corresponds to a factor of 6 decrease in the critical barrier from the homogeneous case. This value is in reasonable agreement with the contact angle of 79 ± 3 estimated from molecular scale theory (DOI 10.1021/ma400703m). This model could be combined with calculations from melt rheology of entropy reduction due to flow to frame discussions of flow-induced crystallization.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 6593-6599 |
| Number of pages | 7 |
| Journal | Macromolecules |
| Volume | 46 |
| Issue number | 16 |
| DOIs | |
| State | Published - Aug 27 2013 |
All Science Journal Classification (ASJC) codes
- Organic Chemistry
- Polymers and Plastics
- Inorganic Chemistry
- Materials Chemistry
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