Liquid Crystalline Polymers by Metathesis Polymerization

Trimmel, Gregor; Riegler, Silvia; Fuchs, Gernot; Slugovc, Christian; Stelzer, Franz

doi:10.1007/b101317

Cited by 57 publications

(44 citation statements)

References 76 publications

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“…The phase transition temperatures and changes in enthalpy (ΔH) obtained during the first cooling and the second heating cycles are summarized in Table 2. The enthalpy changes observed are nearly independent of the molecular weights and this observation is in agreement with results obtained by Trimmel et al [21]. They found that the polymers containing more than ten repeating units gave independent enthalpy changes to the molecular weight but were strongly dependent on spacer length, with a minimum n=6.…”

Section: Liquid Crystalline Propertiessupporting

confidence: 92%

Naphthalene group containing side chain liquid crystalline polymers and their rheological behavior

et al. 2013

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A new polymerizable macromer containing naphthalene ring in the mesogen, 4-butoxyphenyl 6-(6-(methacryloyloxy)hexyl)-2-naphthoate, has been synthesized. The chemical structure of the macromer was confirmed by FTIR, 1 H NMR, 13 C NMR and liquid crystal behavior was confirmed by polarized optical microscope (POM) and small angle X-ray (SAXS). Results from the POM showed nematic phase appearing at 101.9°C and smectic phase at 83.8°C while differential scanning calorimetry (DSC) suggested presence of a wide mesophase range between 50 and 104°C. This macromer was used to synthesize a series of side-chain liquid crystal polymers (SCLCPs) with different molecular weights having narrow polydispersity (PDI) values via living atom transfer radical polymerization (ATRP). The mesomorphic properties of the liquid crystal macromer and polymers were characterized by POM, DSC and SAXS. In addition, the frequency behavior of the polymers in a smectic phase is characterized by the storage modulus, G', leveling off, at low frequencies. Complex viscosities, |η*| of the smectic phase exhibited a shear thinning behavior over the shear rates investigated.

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Section: Liquid Crystalline Propertiessupporting

confidence: 92%

Naphthalene group containing side chain liquid crystalline polymers and their rheological behavior

et al. 2013

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“…IR (neat, NaCl) ν: 2954 (ν as CH 3 st), 2918 (ν as CH 2 st), 2870 (ν s CH 3 st), 2850 (ν s CH 2 st), 1454 (δ as CH 3 bending), 1448 (δ as CH 3 bending), 1385 (δ s CH 3 isopropyl), and 1367 cm -1 (δ s CH 3 isopropyl). 1 …”

Section: Methodsmentioning

confidence: 99%

Ring-Opening Metathesis Polymerizations in d-Limonene: A Renewable Polymerization Solvent and Chain Transfer Agent for the Synthesis of Alkene Macromonomers

et al. 2006

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D-Limonene has been utilized as a renewable solvent and chain transfer agent for the ring-opening metathesis polymerization (ROMP) of alkene macromonomers. The polymerization of various strained monomers, such as norbornene and 1,5-cyclooctadiene (COD), and low-strain monomers, such as cyclopentene, trans,trans,-trans-1,5,9-cyclododecatriene and cycloheptene, have been initiated with a ruthenium carbene complex. The metathesis reactions with D-limonene resulted in decreased weight-average (M w ) molecular weight values compared to ROMP in toluene and hydrogenated D-limonene. For the ROMP of COD in D-limonene, the amount of chain transfer and chain degradation increased with increasing time (1-20 h) and temperature (23-70°C). The formation of the trisubstituted alkene during chain transfer, as evidenced by a model compound, was characterized by 1 H NMR (δ 5.14 ppm). Optimization of the reaction conditions for the ROMP of COD resulted in the synthesis of alkene macromonomers without the need for postpolymerization reactions.

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“…Another interesting class of materials are liquid crystalline ROMP polymers containing large polyaromatic and rigid moieties [7]. However, this work aims at giving examples on how the incorporation of functionalized dyes into ROMP polymers can be utilized to prepare functional materials which is why these topics will not be included in this work.…”

Section: Approaches Towards Defined Dye-functionalization Of Romp-polmentioning

confidence: 99%

Dye-functionalized polymers via ring opening metathesis polymerization: principal routes and applications

2015

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Herein, highlights from the recent literature regarding functional dye-polymer conjugates obtained by ring opening metathesis polymerization (ROMP) are presented and the different approaches to incorporate dyes during the initiation, propagation, and termination step in ROMP are discussed. Applications in the field of chemical sensors, bioimaging, electroactive materials, self-assembly, photochromic and photoreactive materials are used to illustrate the versatility of ROMP as a technique to prepare complex functional materials. Graphical abstract

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Liquid Crystalline Polymers by Metathesis Polymerization

Cited by 57 publications

References 76 publications

Naphthalene group containing side chain liquid crystalline polymers and their rheological behavior

Naphthalene group containing side chain liquid crystalline polymers and their rheological behavior

Ring-Opening Metathesis Polymerizations in d-Limonene: A Renewable Polymerization Solvent and Chain Transfer Agent for the Synthesis of Alkene Macromonomers

Dye-functionalized polymers via ring opening metathesis polymerization: principal routes and applications

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