Physical properties of syndiotactic polypropylene
- 1 December 1991
- journal article
- research article
- Published by Taylor & Francis in Journal of Macromolecular Science, Part B
- Vol. 30 (4) , 319-334
- https://doi.org/10.1080/00222349108219480
Abstract
Crystallization and melting, heat of fusion, and degree of crystallinity of syndiotactic PP were investigated. The double peak melting behavior was established for the partially crystalline polymer. A Hoffman-Weeks extrapolation resulted in equilibrium melting points of 151°C and 155°C for two polymers with relatively short syndiotactic sequences. The enthalpy of fusion was found to be 200 J/g, which corresponds to the value of isotactic pp. A very close correlation between the syndiotactic IR index and the heat of fusion was found. The melting point dependence on the sequence length was evaluated.Keywords
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