Post and prepolymerization strategies to develop novel photochromic poly(esterimide)s

Abstract

This paper reports novel photoresponsive, processable poly(esterimide)s functionalized with the azobenzene and tricyanovinylene groups. Post and prepolymerization strategies were utilized for preparation of the new photochromic polymers with imide rings. The postpolymerization method of azopolymer synthesis included a functionalization of precursor poly(esterimide) containing dialkylaminophenyl groups with diazonium salt of aniline. The precursor poly(esterimide) was obtained from synthe-

Poly(amic acid)s and their poly(amide imide) counterparts containing azobenzene moieties: Characterization, imidization kinetics and photochromic properties

“…The lowest T g was observed for PI-1 containing one azobenzene moiety in the polymer backbone, what is not a typical behavior. Generally, polymers containing more azobenzene moieties in polymer backbone show lower T g s, because of a decrease in the intermolecular interactions between polymer chains [26,37].…”

Thermal, optical and photoinduced properties of a series of homo and co-polyimides with two kinds of covalently bonded azo-dyes and their supramolecular counterparts

“…Upon irradiation by linearly polarized light of appropriate wavelength, they undergo reversible cycles between a thermodynamically stable trans-form and a meta stable cis-form [4,5]. Perpendicular alignment of the azobenzene molecules to the electric field vector generates a photoinduced optical anisotropy, which is observed as changes in the absorption coefficient (DA) and the refractive index (Dn) [5][6][7]. Moreover, the cyclic photoisomerisation of azobenzene-based groups can lead to large-scale mass transport of the polymer chain, which is observed as a sinusoidal modulation of the polymer film referred to a surface relief grating (SRG) [8][9][10][11].…”

Photoinduced birefringence of novel azobenzene poly(esterimide)s; the effect of chromophore substituent and excitation conditions

“…A C C E P T E D ACCEPTED MANUSCRIPT AKF), 2,4-diamino-4'-methylazobenzene (denoted as chromophore AKCH 3 ) have been reported previously [11,22]. Chromophore 2,4-diamino-4'-hydroxyazobenzene (denoted as AKOH) is new and was synthesized according to publication [22].…”

“…The poly(esterimide)s were prepared by the high-temperature polycondensation reaction Polymer PESI(H) was described in our former article [11], however, the photoinduced birefringence in this polymer has not been studied yet.…”

“…Their high glass transition temperature (>200 o C), high thermal stability, low dielectric constant, low susceptibility to a laser light damage make them ideal candidates for various uses in the area of photonics and optoelectronics [10,11]. Polyimides however, exhibit poor solubility; this may be overcome by incorporation of flexible linkages (i.e.…”