Macromol. Chem. Phys. 16/2007

Abstract

Cover: Dynamics of laser‐induced alignment and surface grating formation of azobenzene polymer were examined in relation to the photoisomerization pathway of the excited states. Further details can be found in the Full Paper by M. J. Kim*, J. D. Lee, C. Chun, D. Y. Kim, S. Higuchi, and T. Nakayama on page 1753.

Epoxy-based azo polymers with high chromophore density: Synthesis, characterization and photoinduced birefringence

“…On the other hand, when the excitation wavelength is too close to the absorption band tails, the birefringence growth rate decreases (such as PEP-AZ-Cl at 532 and 589 nm). These results are consistent with those reported before [24] . For the three excitation wavelengths, the azo polymer containing chloro as the electronwithdrawing group (PEP-AZ-Cl) always shows the lowest saturation birefringence level, and the azo polymer containing nitro as the electron-withdrawing group (PEP-AZ-NT) shows the highest saturation birefringence level upon the irradiation at 532 and 589 nm.…”

Comb-like polymer blends of poly(oxyethylene)s with CH3-terminated and CF3-terminated alkylsulfonylmethyl side chains: Effect of terminal CF3 moiety on the surface properties of the blends

“…In particular, they enable polymer surfaces with the desired properties to be prepared using various combinations of polymer backbones and functional side chains [18][19][20][21]. However, to the best of our knowledge, the use of comb-like polymers having side chain crystalline structures as the blend component has not yet been studied for the purpose of controlling the surface properties, although these polymers have special surface features such as a low surface energy, antifouling effects, and excellent stability under water [22][23][24].…”

“…Recently, we synthesized a series of comb-like poly(oxyethylene)s having side chain crystalline phases [20,21,[25][26][27]. Among them, the comb-like poly(oxyethylene)s with n-alkylsulfonylmethyl side chains and CF 3 -terminated alkylsulfonylmethyl side chains shown in Fig.…”

“…Among them, the comb-like poly(oxyethylene)s with n-alkylsulfonylmethyl side chains and CF 3 -terminated alkylsulfonylmethyl side chains shown in Fig. 1 have a bilayer structure on the polymer films and their side chains in the surface layer are oriented almost perpendicular to the surface [15,16,20]. Especially, the poly(oxyethylene) with CF 3 -terminated alkyl sulfonylmethyl side chains has unique wetting properties, which are different from those of typical fluorinated polymers; it showed enhanced wettability by polar solvents compared with poly(oxyethylene)s with n-alkylsulfonylmethyl side chains, while their wettability by non-polar solvents showed the opposite trend.…”

Liquid Crystal Alignment Properties of Poly‐(3‐thiopheneacetate)/Dialkyldimethylammonium Complexes

“…[21,22] The intensities of the CÀH/Rydberg peaks at 908 (normal incidence) are larger than those at 208 (grazing incidence), whereas the intensities of CÀC s à orbital peaks at grazing incidence are larger than those at normal incidence. Therefore alkyl chains of the PTA-Cn are expected to orient more or less perpendicularly to the surface [23] Y.-S. Yoon although the degree of order was found to vary according to the number of carbons. Figure 3 shows the intensity difference between normal incidence and grazing incidence spectra of the PTA-Cn series with the changes of the number of carbon atoms in the alkyl groups.…”