Kinetics of crystal nucleation in molten isotactic polypropylene
Abstract
The crystallization of polypropylene droplets was investigated with the optical microscope. It is found that the droplets will undercool approximately 100 deg (Tm0=178°C). The undercooling attained for most of the droplets is increased by 1.43 deg when the cooling rate is increased by a factor of 10. An isothermal experiment indicates that the droplets crystallize sporadically in time, and nucleation frequency of 1.5 (107) cm−3 sec−1 is found at 79.9°C. Conventional analysis of this data yields a value of Kv, the pre-exponential factor of the nucleation frequency, of the order of 1050, which is much higher than expected from the paraffin data. Analysis which treats the free energy of formation of the nucleus as a discontinuous function of the nucleus size yields the more reasonable value of Kv of the order of 1030, and a value of the surface energy perpendicular to the chain axes, δe, between 60 and 95 erg/cm2.
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Analogous fractionated crystallization observations were later gathered by droplet experiments with i-PP, PEO, PA6 and i-PS.
“Analogous observations were later gathered by droplets experiments with different polymers, i.e., i-PP [3] , PEO, PA6 and i-PS [4] .”
From Fractionated crystallization in semicrystalline polymers (2021) · cites this paper as [3]
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- Authors
- Burns, J. R., & Turnbull, D.
- Affiliations
- Harvard University (US)
- ORCID
- Turnbull, D.
- Venue
- Journal of Applied Physics
- Publisher
- AIP Publishing
- Published
- 1966-10-01
- Volume
- 37
- Issue
- 11
- Pages
- 4021-4026
- ISSN
- 0021-8979 (ISSN-L)
- 1089-7550
- OpenAlex
- W2087934014
- Cited by
- 90
- References
- 7
- Citations by year
- 2025: 2 · 2022: 3 · 2021: 2 · 2020: 3 · 2019: 2 · 2017: 3 · 2016: 4 · 2015: 3 · 2014: 6 · 2013: 4 · 2012: 2
- FWCI
- 2.27
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Applied Physics (publishedVersion)
- Funders
- National Science Foundation
- Graduate Women in Science
- Topics
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › nanoparticles nucleation surface interactions
- Physical Sciences › Materials Science › Materials Chemistry › Crystallization and Solubility Studies
- Keywords
- crystal nucleation, isotactic polypropylene, molten polymers, supercooling, nucleation rate, pre-exponential factor, surface energy, nucleation kinetics, droplet crystallization, cooling rate effects
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