Light‐Responsive Block Copolymers

Schumers, Jean‐Marc; Fustin, Charles-André; Gohy, Jean‐François

doi:10.1002/marc.201000108

Cited by 303 publications

(256 citation statements)

References 106 publications

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“…[1][2][3] Films comprizing azobenzene liquid crystalline (LC) polymers are particularly promising because the excitation can be imparted in a highly selective, precisely controllable manner and without additional changes to the chemical composition of the film. [4] Several…”

Section: Introductionmentioning

confidence: 97%

Reversible Photoinduced Switching of Permeability in a Cast Non‐Porous Film Comprising Azobenzene Liquid Crystalline Polymer

Liu¹,

Wang²,

Dong³

et al. 2011

Macromol. Rapid Commun.

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Permeation characteristics of an azobenzene-containing liquid crystalline (LC) non-porous film are investigated using a metallic corrosion method. Thin films (300 nm) are fabricated by the solution casting of an azobenzene side-chain LC polymer on freshly polished carbon steel coupons. Coated coupons are treated under the following conditions: a) gradual annealing at a cooling rate lower than 1 °C · min(-1) from 150 °C (above its Tg ) to room temperature, and b) irradiation at 465 nm (20 mW · cm(-2) ) with either circularly polarized light (CPL) or non-polarized light (NPL). The morphology of these films is characterized using X-ray diffraction, polarized optical microscopy, and transmission measurements. The results suggest that the annealing treatment resulted in the formation of a polydomain structure consisting of locally ordered small smectic domains that lack mutual orientation. Ordered micro domains are surrounded by disordered phases. CPL and NPL irradiation generates a monodomain orientated structure and an isotropic liquid crystal glass, respectively. The permeability of these non-porous films treated by CPL, NPL, and annealing are found to be 6.14 × 10(-4) , 1.92 × 10(-2) , and 1.56 × 10(-3) cm(3) · m(-2) · d(-1) . An orientation-dependent structure model is constructed to explain the permeation phenomenon, considering the ordered phase is impermeable, only the disordered phase is accessible to penetrating molecules. Fast switching of gas permeation is demonstrated by alternative irradiation of the film with CPL and NPL, which results in an approximately 30-fold difference in the permeability of the non-porous film.

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Section: Introductionmentioning

confidence: 97%

Reversible Photoinduced Switching of Permeability in a Cast Non‐Porous Film Comprising Azobenzene Liquid Crystalline Polymer

Liu¹,

Wang²,

Dong³

et al. 2011

Macromol. Rapid Commun.

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show abstract

“…Recent developments in methods for the preparation of smart responsive polymer membranes and the mechanism of their response to external stimuli with particular attention to the behavior of light responsive polymer membranes was reported in reviews [181,182]. The possibility of an opening or a closing of pores inside the membrane upon the light irradiation or by interaction with different pH of the surrounding solution [183] was taken to the design of polymer capsules used as carriers of therapeutics.…”

Section: Non-fluorescent Prodrugs/converted Into Fluorescent Active Dmentioning

confidence: 99%

Fluorescent Dyes Used in Polymer Carriers as Imaging Agents in Anticancer Therapy

Miksa¹

2016

Med chem (Los Angeles)

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This review highlights the role of fluorescent dyes as active "molecular photoswiches" focusing on the application in bioimaging and anticancer therapies in the field of therapeutic delivery. The author describes the development of prodrugs targeted to specific cell types and polymeric nanocarriers (capsules, micelles and silica nanoparticles) used as fluorescent probes which offer advantages in the integration of "smart" features of fluorescent dyes into synthetic materials. The incorporation of biologically responsive components that cleave upon changes in pH or light irradiation is fundamental to the successful design of such carriers with capabilities to load and release therapeutics specifically at a target site.

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“…Such phenomena can be observed in chemical compounds such as azobenzene [21], spiropyran [22], and triphenylmeth- ane leuco [23]. Irreversible light responsivity is achieved when polymers contain photocleavable units, which subsequently yield the polymer response [24]. For example, the ester bond of o-nitrobenzyl ester (ONB) [25,26] irreversibly breaks upon exposure to UV light.…”

mentioning

confidence: 98%

Responsive Polymers as Sensors, Muscles, and Self-Healing Materials

Zhang

Serpe

2015

Topics in Current Chemistry

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Responsive polymer-based materials can adapt to their surrounding environment by expanding and shrinking. This swelling and shrinking (mechanotransduction) can result in a number of functions. For example, the response can be used to lift masses, move objects, and can be used for sensing certain species in a system. Furthermore, responsive polymers can also yield materials capable of self-healing any damage affecting their mechanical properties. In this chapter we detail many examples of how mechanical responses can be triggered by external electric and/or magnetic fields, hygroscopicity, pH, temperature, and many other stimuli. We highlight how the specific responses can be used for artificial muscles, self-healing materials, and sensors, with particular focus on detailing the polymer response yielding desired effects.

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Light‐Responsive Block Copolymers

Cited by 303 publications

References 106 publications

Reversible Photoinduced Switching of Permeability in a Cast Non‐Porous Film Comprising Azobenzene Liquid Crystalline Polymer

Reversible Photoinduced Switching of Permeability in a Cast Non‐Porous Film Comprising Azobenzene Liquid Crystalline Polymer

Fluorescent Dyes Used in Polymer Carriers as Imaging Agents in Anticancer Therapy

Responsive Polymers as Sensors, Muscles, and Self-Healing Materials

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