Ionomeric poly(urethane semicarbazides) with azobenzene groups in the main chain – studies on photoswitching behaviour and mechanical properties

Synthesis and photoresponsive behavior of the high-Tg azobenzene polymers via RAFT polymerization

“…The diffraction efficiency of SRG is dependent on the surface modulation depth, the grating spacing and the space period [69]. Moreover, gratings can be erased by heating the film to T g [15,[18][19][20][21][22][23]. The high-T g azobenzene polymer PMSt maintained the SRG profile well when the thin film was heated to the temperature lower than T g .…”

“…These SRGs are typically stable substantially below the glass transition temperatures (T g s) of the azobenzene polymers and are erased by heating the polymers to their T g s [16]. Photo fabrication of stable SRGs on the azobenzene polymer films for practical applications therefore requires polymers with good thermal stability and high T g matrices, such as supramolecular polymers [17] and main-chain azobenzene polymers [18][19][20][21][22][23].…”

Synthesis and characterization of photoactive poly(arylene ether sulfone)s containing azobenzene moieties in their main chains

“…Polymers bearing azobenzene moieties (azo-polymers) are fascinating materials and have attracted considerable attention in recent years because of their unique reversible photo-isomerization and photoinduced anisotropy properties [3][4][5][6][7][8]. The photoinduced isomerization and anisotropy can cause significant bulk, surface property variation and polarity of the polymers, such as photoinduced phase transition, photoinduced surface relief gratings (SRGs) and photoinduced birefringence [9][10][11][12][13][14][15], which show potential applications in fields such as optical data storage, optical switching and nonlinear optical materials [16][17][18][19][20][21][22][23]. In order to increase the optical stability for long-term applications, many efforts have been made to design and synthesize new high-T g aromatic azo-polymers, such as polyacrylate containing fully aromatic azo side chains and azo-polyimides.…”

Synthesis and characterization of photoresponsive POSS-based polymers and their switchable water and oil wettability on cotton fabric

“…The initial weight-loss in the region of 280-310 C may be due to the exothermic decomposition of azo group (-N]N-). 33 Subsequently, a rapid weight loss in the range of 310-370 C is attributed to the degradation of backbone. The weight loss in 370-500 C is due to elimination of phenyl rings.…”