Synthesis, Characterization and Morphology of Block Copolymers Poly(3-hexylthiophene)-b-Poly(3-thiophene hexylacetate)
Date Issued
2011
Date
2011
Author(s)
Liu, Yu-Cheng
Abstract
The synthesis, characterization and morphology study of copolymers of poly(3-hexylthiophene) (P3HT) and poly(3-thiophene hexylacetate) (P3THA) are performed in this thesis. By using GRIM method, polymers with high regioregularity, narrow polydispersity and controlled molecular weight can be obtained. From the optoelectronic properties characterization, the ester-functionalized P3THA shows a blue-shift UV-Vis spectrum and lower HOMO as compared to P3HT. These results are contributed to the bulky and the electron-withdrawing ester group which decrease the conjugated length. The amount of blue shift is directly proportional to the amount of P3THA in the block copolymer. From the CV measurements, each respective HOMO and LUMO is observed in each block segment of block copolymer which does not present in the random copolymers. The thermal and phase behaviors of the block copolymers were investigated by DSC, WAXS, GIWAXS and AFM. The crystalline morphology of copolymers is dependent on the block compositions of P3HT-b-P3THA. Phase separation is observed as the P3HT block higher than 50% molar ratio. When the molar ratio of P3THA is larger than 80%, the cocrystalline structure is observed. Thus, the crystalline morphology can be tuned by changing the block copolymer compositions. The results are useful for the design and fabrication of nanostructured conducting polymers.
Subjects
conjugated copolymer
block
polythiophene
polythiophene ester
self-assembly
optical properties
phase diagram
Type
thesis
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