End-Group Effect of PEG on Polymorphic Crystallization Kinetics of PLLA

• Main Authors: Han-Yun Chang, 張漢耘
• Other Authors: 廖文彬
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/59894673710274407713

碩士 === 臺灣大學 === 高分子科學與工程學研究所 === 98 === 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.