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Sun JT, Ge ZX, Li CY, Zhang ZY, Wang YM, Jia YG, Tian M, Yao DS. Novel branched liquid crystal oligomers containing azo and Schiff base groups. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2022.134322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Laanesoo S, Bonjour O, Parve J, Parve O, Matt L, Vares L, Jannasch P. Poly(alkanoyl isosorbide methacrylate)s: From Amorphous to Semicrystalline and Liquid Crystalline Biobased Materials. Biomacromolecules 2020; 22:640-648. [PMID: 33307669 PMCID: PMC7874169 DOI: 10.1021/acs.biomac.0c01474] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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We
have prepared a series of 12 d-isosorbide-2-alkanoate-5-methacrylate
monomers as single regioisomers with different pendant linear C2–C20
alkanoyl chains using biocatalytic and chemical acylations. By conventional
radical polymerization, these monomers provided high-molecular-weight
biobased poly(alkanoyl isosorbide methacrylate)s (PAIMAs). Samples
with C2–C12 alkanoyl chains were amorphous with glass transition
temperatures from 107 to 54 °C, while C14–C20 chains provided
semicrystalline materials with melting points up to 59 °C. Moreover,
PAIMAs with C13–C20 chains formed liquid crystalline mesophases
with transition temperatures up to 93 °C. The mesophases were
studied using polarized optical microscopy, and rheology showed stepwise
changes of the viscosity at the transition temperature. Unexpectedly,
a PAIMA prepared from a regioisomeric monomer (C18) showed semicrystallinity
but not liquid crystallinity. Consequently, the properties of the
PAIMAs were readily tunable by controlling the phase structure and
transitions through the alkanoyl chain length and the regiochemistry
to form fully amorphous, semicrystalline, or semi/liquid crystalline
materials.
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Affiliation(s)
- Siim Laanesoo
- Institute of Technology, University of Tartu, Nooruse 1, Tartu 50411, Estonia
| | - Olivier Bonjour
- Department of Chemistry, Lund University, Box 124, Lund 221 00, Sweden
| | - Jaan Parve
- Institute of Technology, University of Tartu, Nooruse 1, Tartu 50411, Estonia.,Department of Chemistry and Biotechnology, Tallinn University of Technology, Ehitajate tee 5, Tallinn 19086, Estonia
| | - Omar Parve
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Ehitajate tee 5, Tallinn 19086, Estonia
| | - Livia Matt
- Institute of Technology, University of Tartu, Nooruse 1, Tartu 50411, Estonia
| | - Lauri Vares
- Institute of Technology, University of Tartu, Nooruse 1, Tartu 50411, Estonia
| | - Patric Jannasch
- Institute of Technology, University of Tartu, Nooruse 1, Tartu 50411, Estonia.,Department of Chemistry, Lund University, Box 124, Lund 221 00, Sweden
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Spherical Compound Micelles with Lamellar Stripes Self-Assembled from Star Liquid Crystalline Diblock Copolymers in Solution. MACROMOL CHEM PHYS 2017. [DOI: 10.1002/macp.201700148] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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4-Hydroxycoumarin functionalized cyclotriphosphazenes: Synthesis, characterization and fluorescence properties. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2017.01.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Song L, Lu S, Xiao X, Qi B, He Z, Xu X, Rao B, Yu J. Enhanced thermal and mechanical properties of liquid crystalline-grafted graphene oxide-filled epoxy composites. Polym Bull (Berl) 2016. [DOI: 10.1007/s00289-016-1792-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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