Photochromic behavior of spiropyran in polystyrene and polycaprolactone thin films – Effect of UV absorber and antioxidant compound

Samoladas, A.; Bikiaris, Dimitrios N.; Zorba, T.; Paraskevopoulos, K. M.; Jannakoudakis, A.D.

doi:10.1016/j.dyepig.2006.09.012

Cited by 32 publications

(32 citation statements)

References 17 publications

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“…The greatest interest in PCL was observed during the 1970-1980 decade, when it was primarily used as a drug carrier. Due to its good rheological and viscoelastic properties and therefore its ease of processing, PCL has an advantage over other polyesters [16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Controlled degradation of biocomposites ENR/PCL containing natural antioxidants

Masek

Zaborski

Piotrowska

2014

Comptes Rendus. Chimie

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Section: Introductionmentioning

confidence: 99%

Controlled degradation of biocomposites ENR/PCL containing natural antioxidants

Masek

Zaborski

Piotrowska

2014

Comptes Rendus. Chimie

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“…Since their discovery, photochromic SPs have been incorporated into various materials, i.e., surface bound monolayers,7, 11–13 Langmuir monolayers,14 Langmuir‐Blodgett films,14 polymeric brushes,9, 15–17 photocontrollable surfactants,18 liquid crystalline materials,19 polymeric matrices,8, 15, 16, 20–36 organic/inorganic hybrid systems,37 colloidal particles,17, 38 ionic liquids (ILs)39–43 and initiators for radical polymerisations 44…”

Section: Introductionmentioning

confidence: 99%

Hydroxyethylcellulose‐graft‐poly(2‐(dimethylamino)ethyl methacrylate) as physically adsorbed coating for protein separation by CE

Cao

Zhou

et al. 2011

Electrophoresis

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In this work, a novel graft copolymer, hydroxyethylcellulose-graft-poly(2-(dimethylamino)ethyl methacrylate) (HEC-g-PDMAEMA), used as physical coatings of the bare fused-silica capillaries, was synthesized by using ceric ammonium nitrate initiator in aqueous nitric acid solution. EOF measurement results showed that the synthesized HEC-g-PDMAEMA graft copolymer-coated capillary in this paper could suppress EOF effectively compared to the bare fused-silica capillary, and efficient separations of basic proteins were also achieved. The electrical charge of the coated capillary wall could be modulated by varying not only the pH of the running buffer, but also the grafting ratio of poly(2-(dimethylamino)ethyl methacrylate) grafts, which makes possible the analysis of basic and acidic proteins in the same capillary. The effects of poly(2-(dimethylamino)ethyl methacrylate) grafting ratio in HEC-g-PDMAEMA and buffer pH on the separation of basic proteins for capillary electrophoresis were investigated in detail. Furthermore, egg white proteins and milk powder samples were separated by the HEC-g-PDMAEMA-coated capillary. The results demonstrated that the HEC-g-PDMAEMA copolymer coatings have great potential in the field of diagnosis and proteomics.

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“…This was also obtained from our previous study between the polar PCL and the non polar PS. 19 The rate in the PCL was found to be lower, under identical experimental conditions, than that of the PS film.…”

Section: Decoloration Process Of Merocyanine In Pcl-pesu Filmsmentioning

confidence: 92%

“…19 Since PCL is a more polar polymer compared with PS, this acceleration was attributed to the interactions that take place between carboxyl and hydroxyl end groups of PCL and merocyanine. Furthermore, the addition of a UV absorber and an antioxidant compound, which are two of the most frequently used stabilizers in polymers, has also an accelerating effect.…”

Section: Introductionmentioning

confidence: 99%

Effect of end group content on photochromic behavior of spiropyran in polycaprolactone–poly(ethylene succinate) blends

Samoladas

Jannakoudakis

Bikiaris

et al. 2007

J of Applied Polymer Sci

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ABSTRACT:The photochromic behavior of the spiropyran 1 0 ,3 0 -dihydro-8-methoxy-1 0 ,3 0 ,3 0 -trimethyl-6-nitrospiro[2H-1-benzopyran-2,2 0 -(2H)-indole] has been investigated in thin films of polycaprolactone-poly(ethylene succinate) blends containing different weight ratios of poly(ethylene succinate) (PESu) and spiropyran. The effects of molecular weight and end group content (À ÀCOOH and À ÀOH) of PESu into the coloration-decoloration rate of the fabricated photochromic films have also been examined. The films were exposed to UV radiation (365 nm) at ambient temperature and the absorbance spectra of each polymer blend film were recorded for different time periods. The increase of the amount of PESu in the polymer substrate from 20 to 40 wt % shifts the absorbance towards shorter wavelengths. The same trend was also observed with the increase of carboxyl and hydroxyl groups of the macromolecular chain of the added PESu. Interactions between the polar polymer groups and the spiropyran species, which are formed under the UV excitation, seem to contribute to the color stabilization of the photochromic films. The photochromic response revealed unexceptional repeatability between the slightly colored spiropyran and the intense colored amphoteric species for all the examined polymer matrices. The decoloration rate of the spiropyran-polymer blends follow the kinetic of a first order reaction.

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Photochromic behavior of spiropyran in polystyrene and polycaprolactone thin films – Effect of UV absorber and antioxidant compound

Cited by 32 publications

References 17 publications

Controlled degradation of biocomposites ENR/PCL containing natural antioxidants

Controlled degradation of biocomposites ENR/PCL containing natural antioxidants

Hydroxyethylcellulose‐graft‐poly(2‐(dimethylamino)ethyl methacrylate) as physically adsorbed coating for protein separation by CE

Effect of end group content on photochromic behavior of spiropyran in polycaprolactone–poly(ethylene succinate) blends

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