Virginia Tech
Understanding the role of kinetic parameters on the crystallization of miscible semicrystalline polymer blends
Abstract
dc:description.abstractThis dissertation discusses results of crystallization kinetic, morphology and scattering studies on miscible semi crystalline blends of poly(pivalolactone)/ poly(vinylidene fluoride)(pPVLIPVF₂) and poly(pivalolactone)/poly(vinylidene fluoride <i>co</i>- tetrafluoroethylene)(95-5) (PPVL/P(VF2-TFE)(95-5)) prepared by solution blending. The spherulitic growth rates of the α-phase PPVL from miscible blends with PVF₂ or P(VF₂- TFE)(95-5) were measured by polarized optical microscopy as a function of blend composition and isothermal crystallization temperature, Tx, between 160°C and 215.5°C. The PPVL weight fraction in the blends ranged from 100 to 10 wt%. Using the Lauritzen-Hoffman kinetic theory of polymer crystal growth, the equilibrium melting temperatures of the α-phase PPVL in both the PPVL/PVF₂ and the PPVL/P(VF₂-TFE)(95-5) blends have been determined, for the first time, directly from the spherulitic growth rate data. Analysis of the composition dependence of the nucleation constant, Kg suggests that the α-phase PPVL crystal/melt lateral interface free energy, Ï , in the blends decreases markedly with increasing PVF₂ or P(VF₂-TFE)(95-5) concentration.
Degree
thesis:*- Name thesis:degree_name
- Ph. D.
- Level thesis:degree_level
- doctoral
- Discipline thesis:degree_discipline
- Chemistry
- Department dc:contributor.department
- Chemistry
- Grantor dc:publisher
- Virginia Tech
- Year dc:date.issued
- 1995
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Huang, Jiang
- Chair dc:contributor.committeechair
-
- Marand, Hervé L.
- Committee members dc:contributor.committeemember
-
- Gibson, Harry W.
- Riffle, Judy S.
- Wightman, James P.
- Wilkes, Garth L.
Subjects
dc:subject × 3Rights
dc:rights- Statement dc:rights
-
- In Copyright
- Licence dc:rights.uri
- Language dc:language.iso
- en
Identifiers
dc:identifier.*- Dc Identifier Other
- etd-11102005-141118
- OAI identifier oai:identifier
- oai:vtechworks.lib.vt.edu:10919/40312