Phase behavior of poly (pyromellitimide)s having flexible (n-alkyloxy)methyl side chains
SCIE
SCOPUS
- Title
- Phase behavior of poly (pyromellitimide)s having flexible (n-alkyloxy)methyl side chains
- Authors
- Kim, H; Choi, YJ; Jung, JC; Zin, WC
- Date Issued
- 2000-10
- Publisher
- SPRINGER-VERLAG
- Abstract
- Phase behavior of poly(pyromellitimide)s having (n-alkyloxy)methyl side chains (-CH2OCmH2m+1, m=4, 6, 8) has been studied by wide angle X-ray scattering, differential scanning calorimetry and C-13 solid-state NMR. While there are no observable transitions in the polymers bearing short side chain (m=4, 6), there is one transition in the polymer bearing the longest side chain (m=8), which is assigned to mesophase-mesophase transition. All the samples show layered mesophase at room temperature, in which the side chains are amorphous but the main chains form two-dimensional crystals in each layer. In the polymer bearing the longest side chain (m=8), it shows another layered mesophase at high temperature. In the high temperature mesophase, the main chains do not form two-dimensional crystals in each layer; only the lateral packing of the main chains remains undisrupted.
- Keywords
- RIGID-ROD POLYESTERS; CRYSTALLINE LAYERED PHASES; 1,4-DIALKYL ESTERS; PYROMELLITIC ACID; SOLID-STATE; C-13 NMR; CHEMICAL-SHIFTS; POLYIMIDES; 4,4' -BIPHENOL; CONFORMATION
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/21009
- DOI
- 10.1007/s002890070028
- ISSN
- 0170-0839
- Article Type
- Article
- Citation
- POLYMER BULLETIN, vol. 45, no. 3, page. 253 - 258, 2000-10
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