Morphology and Toughness of the Epoxy Nanocomposites containing Amphiphilic Triblock Copolymer
| Autor: | Tse-Yu Lin, 林澤宇 |
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| Rok vydání: | 2012 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 100 Three kinds of amphiphilic triblock copolymers—methoxypoly- ethyleneglycol-b-polybutadiene-b-methoxypolyethylene glycol (MBMs) were synthesized via the esterification of methoxypolyethylene glycol (MPEG) of different Mn (750, 2000, and 5000) with the carboxyl-terminated polybutadiene (CTPB). The MBMs were used as nanodomain-toughener and were mixed, at 5wt%, with diglycidyl ether bisphenol A (DGEBA) /4,4′-methylene dianiline (MDA) solution and heat-cured to afford the nanocomposites—DM-(MBMs). By tuning-up weight ratios of MBMs:MBMs of different Mn, the MBMs self-assembled into nanostructured spherical micelles and vesicles and well-dispersed in the DGEBA/MDA matrix. The morphology of the DM-(MBMs) was investigated by transmission electron microscopy (TEM). It was found that the tensile and fracture toughness of the DM-(MBMs) can be improved significantly without reducing their modulus and thermal stability. The fracture surface of the nanocomposites was investigated by scanning electron microscope (SEM) and the fracture mechanism of the nanocomposites was deduced. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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