Title page for ETD etd-11102005-141118


Type of Document Dissertation
Author Huang, Jiang
URN etd-11102005-141118
Title Understanding the role of kinetic parameters on the crystallization of miscible semicrystalline polymer blends
Degree PhD
Department Chemistry
Advisory Committee
Advisor Name Title
Marand, Herv L. Committee Chair
Gibson, Harry W. Committee Member
Riffle, Judy S. Committee Member
Wightman, James P. Committee Member
Wilkes, Garth L. Committee Member
Keywords
  • Miscible Polymer Blends
  • Poly(vinylidenc fluoride)
  • Poly(pivalolactone)
Date of Defense 1995-08-05
Availability restricted
Abstract

This 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 fluorideco- 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, σ, in the blends decreases markedly with increasing PVF2 or P(VF2-TFE)(95-5) concentration.

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