Amphiphilic block copolymers for heterogeneous polymer blends

• Main Authors: Fan-Jie Lin, 林凡傑
• Other Authors: Chi-Ching-Kuo
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/4dtr7w

碩士 === 國立臺北科技大學 === 分子科學與工程系有機高分子碩士班 === 106 === In this study, amphiphilic block copolymer macromolecules were synthesized by atom transfer radical polymerization (ATRP), the materials selected were monomers 2-Hydroxyethyl methacrylate (HEMA, the diblock copolymer hydrophilic end) and Glycidyl methacrylate (GMA, the diblock copolymer lipophilic end). The macroinitiator poly(HEMA)-Br was prepared as the first segment of the diblock copolymer by using ATRP as the HEMA monomer, followed by, the second segment that was based on the macroinitiator Poly(HEMA)-Br which was bonded with GMA monomer by ATRP. The synthesized diblock copolymer Poly(HEMA)-b-Poly(GMA) was then subjected to 1H-NMR characterization and gel permeation chromatography (GPC) for analysis of molecular weight and its distribution. Subsequently, the diblock polymer prepared by ATRP was used as a compatibilizer in the blending system of high-molecular polyetherimide (PEI) and polyethylene naphthalate (PEN), it is also expected to make blends with homogeneous dispersion properties, were we used thermal property analyzers for testing and identification. For example: Dynamic Mechanical Analysis (DMA), Differential Scanning Calorimeter (DSC), Thermogravimetric Analyzer (TGA). According to the results of this study, PEI and PEN blends by adding a diblock polymer where a glass transition temperature is biased towards the other partys glass transition temperature trend, in which it was confirmed by DSC and DMA. Moreover, the same situation was also confirmed by the TGA for the pyrolysis temperatures of the PEI and PEN polymers, which explains why the block copolymers play a desirable role in uniform dispersion between two poorly-phased polymers. In summary, using this living polymerization method to prepare a multi-functional block copolymer material is highly feasible, In the future this synthesis method will have considerable potential for applicants in the fields of emulsifiers, surfactants, and amphiphilic composites.