End-Group Effect of PEG on Polymorphic Crystallization Kinetics of PLLA
Date Issued
2010
Date
2010
Author(s)
Chang, Han-Yun
Abstract
This study focused on the misbility and crystallization kinerics which effected by different end groups of polyethylene glycol (PEG) to poly lactic acid (PLLA) / PEG system. PLLA has ordered α structure which is close at higher crystallization temperature, and relatively loosely in α '' structure at low crystallization temperature. PLLA in PEG incorporation we will change the thermodynamics of the glass transition temperature and equilibrium melting point, using POM, DSC, XRD to observe the relationship between crystallization kinetics model and thermodynamic parameters, especially emphasis on the bouble structure coexistence phase. We also found that the structure is a crystallization kinetic model of two competing growth.
In addition, PLLA were also blended with PEG-2NH2, PEG-2OH, PEG-2CH3, three different end groups of PEG to observe the PLLA / PEG system. Different end groups of PEG and PLLA have different misbility, in addition to changing the glass transition temperature and equilibrium melting point, but also changes the crystallization of the surface free energy of chain folding, thus indirectly affecting the crystallization kinetics of PLLA / PEG system.
Subjects
PLLA
PEG
crystallization kinetics
crystal structure
Type
thesis
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