Tridimensional Surface Relief Modulation of Polymeric Films

Apostol, I.; Hurduc, Nicolae; Damian, V.

doi:10.5772/8401

Cited by 2 publications

(3 citation statements)

References 14 publications

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“…42 The light source of our setup was an Nd:YAG laser working on his third harmonic at 355 nm and with a pulse High Performance Polymers length at full-width half maximum (FWHM) of 6 ns, with a repetition frequency of 10 Hz and a beam divergence of 0.6 mrad.…”

Section: The Surface Structuration Investigationsmentioning

confidence: 99%

“…Laser radiation is diffracted and the beams are separated by an angle y; at the interference, according to the interferometer scheme (Figure 10), one obtains either an interferometric image with the pitch equal to the pitch of the diffraction grating, or two beams separated by 2y angle, which give a half of the diffraction grating pitch. 42 The light source of our setup was an Nd:YAG laser working on his third harmonic at 355 nm and with a pulse length at full-width half maximum (FWHM) of 6 ns, with a repetition frequency of 10 Hz and a beam divergence of 0.6 mrad.…”

Section: The Surface Structuration Investigationsmentioning

confidence: 99%

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Study of the nanostructuration capacity of some azopolymers with rigid or flexible chains

Sava¹,

Hurduc

Săcărescu³

et al. 2012

High Performance Polymers

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Azobenzene polymers have been the subject of intensive research due to their unique and unexpected properties that allow various applications triggered by light. One of their attractive features is the possibility of changing the orientation of azobenzene chain through trans-cis-trans photoisomerization cycles to photoinduce birefringerence and linear dichroism in thin polymer films. The photochromic behavior and surface structuring capacity of rigid or flexible polymers having side azobenzene units have been investigated. The polyimides with side azobenzene units have rigid structure, while polysiloxane chains modified with azobenzene groups and nucleobases are considered materials with flexible structure. During the photochromic studies of the investigated polymers, a mechanism concerning the possibility to generate a fluid phase under UV/VIS irradiation was proposed. The photoisomerisation kinetic by UV-Vis irradiation in the solid state compared with the solution and the cis-trans azobenzene relaxation phenomena were presented. The surface structuring capacity of these polymers was studied using a Nd:YAG laser at 355 nm, at different incident fluencies and pulse numbers.

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Section: The Surface Structuration Investigationsmentioning

confidence: 99%

Section: The Surface Structuration Investigationsmentioning

confidence: 99%

Study of the nanostructuration capacity of some azopolymers with rigid or flexible chains

Sava¹,

Hurduc

Săcărescu³

et al. 2012

High Performance Polymers

View full text Add to dashboard Cite

show abstract

“…In the case of polymers functionalized with azobenzene derivatives the cyclic photoisomerization of the azobenzene‐based groups can also lead to the large‐scale mass transport of the polymer chains which is observed as a surface relief grating (SRG) . Polymers suitable for efficient SRG formation reveal many possible applications mostly in photonics and for micro‐ and nanoscale processing technologies in microelectronics instead of lithography …”

Section: Introductionmentioning

confidence: 99%

Characterization of poly(amic acid)s and resulting polyimides bearing azobenzene moieties including investigations of thermal imidization kinetics and photoinduced anisotropy

et al. 2014

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Azobenzene-containing poly(amic acid)s and resulting polyimides were synthesized. Polymers differed in the polymer backbone structure and the position at which the azobenzene group was attached to the polymer chain. Polymers were characterized and evaluated using Fourier transform infrared, 1 H NMR and UV-visible spectroscopies, X-ray diffraction, differential scanning calorimetry (DSC) and thermogravimetric analysis. Polyimides revealed glass transition temperatures in the range 160-265 ∘ C, and thermal stability with decomposition temperatures in the range 336-444 ∘ C. The thermal imidization kinetics of poly(amic acid)s was investigated by means of DSC. Kinetic parameters, such as the activation energy (E) and the frequency factor, were estimated using the Ozawa and Kissinger models. The values of E, determined using both methods, were in the range 142.52-200.92 kJ mol −1 . The photoinduced optical anisotropy (POA) was studied in the obtained azopolymers using a holographic grating recording technique. Surface relief gratings, which appeared after light exposure, were observed using atomic force microscopy. For the first time to the best of our knowledge, photoinduced anisotropy in poly(amic acid)s was studied and compared with POA in their polyimide analogues.

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Tridimensional Surface Relief Modulation of Polymeric Films

Cited by 2 publications

References 14 publications

Study of the nanostructuration capacity of some azopolymers with rigid or flexible chains

Study of the nanostructuration capacity of some azopolymers with rigid or flexible chains

Characterization of poly(amic acid)s and resulting polyimides bearing azobenzene moieties including investigations of thermal imidization kinetics and photoinduced anisotropy

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