Optical reversible behavior of poly(ethylene- b -ethylene oxide) block copolymer dispersed liquid crystal blends

Carrasco‐Hernandez, Sheyla; Gutierrez, Junkal; Tercjak, Agnieszka

doi:10.1016/j.eurpolymj.2017.04.002

Cited by 5 publications

(3 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Block copolymers offer a very versatile strategy to tailor the properties of the new electrolytes, by locating specific functionalities in different segments [45][46][47]. We envisage that the application of controlled radical polymerization techniques will facilitate the simultaneous introduction of polar and light-responsive units in new electrolytes, which is normally challenging, due to their very different chemical natures [48][49][50]. We envisage that the new multifunctional materials prepared in this work will open new possibilities to develop controllable polymeric liquid crystalline electrolytes with anhydrous conductivity, but also sensors and light-responsive materials with high spatial and temporal resolution, via the introduction of photochromism [51].…”

Section: Introductionmentioning

confidence: 99%

Liquid Crystalline Copolymers Containing Sulfonic and Light-Responsive Groups: From Molecular Design to Conductivity

et al. 2020

View full text Add to dashboard Cite

In the search for novel smart multifunctional liquid crystalline materials, we report the synthesis, thermal and structural characterisation, and the conductivity, of a set of new block and statistical copolymers, containing light-responsive mesogenic groups (MeOAzB), polar sulfonic acids (AMPS), and methyl(methacrylate) groups (MMA). By using a cascade of reversible addition-fragmentation chain polymerisations, RAFT, we have tailored different side-chain polymeric structures by controlling monomer composition (MeOAzB/AMPS/MMA) and configuration. We have yielded simultaneous liquid crystalline behaviour and appreciable conductivity in polymers with low concentrations of polar acid groups, by the formation of smectic phases in narrow aggregates. The light-responsiveness of the polymers, via reversible trans-to-cis photoisomerization of azobenzene groups, and the local activation of conductivity at relatively low temperatures, opens the possibility to prepare polymer electrolytes for energy conversion and storage, whose conductivity could be controlled and optimised by external stimuli, including light irradiation.

show abstract

Section: Introductionmentioning

confidence: 99%

Liquid Crystalline Copolymers Containing Sulfonic and Light-Responsive Groups: From Molecular Design to Conductivity

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The PIPS method is versatile and usually applied for fabricating PDLC films because of its stability, fast curing speed, uniformity, and controllability under photoinitiated polymerization conditions . Applied PDLC devices in the present typically have high driving voltages (greater than 50 V), long response times (greater than 50 ms), and low contrast ratios (less than 100), which can be achieved by varying the morphology of the PDLCs, via changing the LCs and the monomers employed such as the polymerizable group and the polymerization conditions …”

Section: Introductionmentioning

confidence: 99%

“…18Applied PDLC devices in the present typically have high driving voltages (greater than 50 V), long response times (greater than 50 ms), and low contrast ratios (less than 100), which can be achieved by varying the morphology of the PDLCs, 19-24 via changing the LCs and the monomers employed 25-30 such as the polymerizable group 31 and the polymerization conditions. [32][33][34][35][36][37] The thiol-ene click reaction is the hydrothiolation of a C═C bond, defined by Kolb et al, 38 and has often conducted via the dissociation of a photoinitiator into a radical species. 39,40 Moreover, the thiol-ene click reaction has simplicity, robustness, and fast reaction speed in the field of polymer and materials chemistry.…”

mentioning

confidence: 99%

Comparative studies of polymer‐dispersed liquid crystal films via a thiol‐ene click reaction

Zhong

Mandle

Goodby

et al. 2019

Polymers for Advanced Techs

View full text Add to dashboard Cite

In this work, the thiol‐ene click reaction is employed to fabricate polymer‐dispersed liquid crystal (PDLC) films by photoinitiated polymerization. The PDLC films are prepared by systematic variation of key conditions: variety and content of ‐ene monomer, liquid crystal (LC) content, curing time, and curing light intensity. We find that both the morphologies and electro‐optic properties of these films are adjustable. When increasing the length of alkyl main chain of ‐ene monomers, the driving voltages reduce, but in turn, the contrast ratio decreases. Increasing ‐ene monomer content raises the driving voltages as well as the response time, and the increase of LC content lowers the driving voltages but has a negative effect on the contrast ratio. The changes to the curing conditions (both curing time and UV light intensity) can be used to modify the driving voltages, response time, and contrast ratios of PDLC films. These comparative studies will elucidate new insights in commercial applications of intelligent PDLC films.

show abstract

Bioinspired Stimuli‐Responsive Color‐Changing Systems

2018

View full text Add to dashboard Cite

Stimuli-responsive colors are a unique characteristic of certain animals, evolved as either a method to hide from enemies and prey or to communicate their presence to rivals or mates. From a material science perspective, the solutions developed by Mother Nature to achieve these effects are a source of inspiration to scientists for decades. Here, an updated overview of the literature on bioinspired stimuli-responsive color-changing systems is provided. Starting from natural systems, which are the source of inspiration, a classification of the different solutions proposed is given, based on the stimuli used to trigger the color-changing effect.

show abstract

Optical reversible behavior of poly(ethylene- b -ethylene oxide) block copolymer dispersed liquid crystal blends

Cited by 5 publications

References 40 publications

Liquid Crystalline Copolymers Containing Sulfonic and Light-Responsive Groups: From Molecular Design to Conductivity

Liquid Crystalline Copolymers Containing Sulfonic and Light-Responsive Groups: From Molecular Design to Conductivity

Comparative studies of polymer‐dispersed liquid crystal films via a thiol‐ene click reaction

Bioinspired Stimuli‐Responsive Color‐Changing Systems

Contact Info

Product

Resources

About