Side-Chain Jacketed Liquid Crystalline Polymer Forming Double-Chain Supramolecular Column and Hexagonal Superlattice
| Autor: | Xiao-Song Yu, Lin-Lin Ding, Jia Sun, Shuang Yang, Rui Zhang, Kai-Ling Yu, Xiang-Kui Ren, Jia-Ru Xu, Xu-Qiang Jiang, Yan-Fang Zhang, Jun-Feng Zheng, Er-Qiang Chen, Yang Zhao, Tao Tang |
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| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Polarized light microscopy Materials science Polymers and Plastics Superlattice Organic Chemistry 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Inorganic Chemistry Crystallography chemistry Phase (matter) Materials Chemistry Side chain 0210 nano-technology Thermal analysis Columnar phase Alkyl |
| Zdroj: | Macromolecules. 51:6949-6957 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/acs.macromol.8b00943 |
| Popis: | We synthesized a series of poly(dialkyl 1-viny-3,5-isophthalate) (P3,5-n, n is the number of carbons on alkyl group, n = 4–18), wherein the polyethylene backbone is jacketed by the isophthalate side chains. The phase behaviors of P3,5-n were investigated by using various techniques including thermal analysis, polarized light microscopy, and X-ray diffraction. It is identified that with n ≥ 8 the P3,5-n samples form the hexagonal columnar phase (ΦH). Furthermore, P3,5-16 and P3,5-18 can exhibit a four-column hexagonal superlattice (ΦHS), wherein one column is frustrated. After the alkyl tails are fully melted or crystallized, the ΦHS degrades into the conventional ΦH phase. For the ΦH of P3,5-n observed, the cross section area of the column (S) increases linearly with n, S = 1.97 + 0.52n (nm2). The number of repeating units (Zrep) required to be packed in the 0.44 nm thick column stratum is 4. Compared with poly(dialkyl 1-vinyl-2,5-terephthalate) (P2,5-n), which is the isomer of P3,5-n and can form the ΦH ... |
| Databáze: | OpenAIRE |
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