The Effect of UV Irradiation on the Transmittance Bands of Polystyrene-block-2-vinylpyrimidine

Abstract

Block copolymers have been investigated for fabricating functional nanomaterials due to their properties of self-assembly. We prepared polystyrene-b-poly(2-vinyl pyridine) (PS-b-P2VP) lamellar films which is hydrophobic block-hydrophilic polyelectrolyte block polymer have 57 kg=mol-b-57 kg=mol. The lamellar stacks are obtained by exposing the spin coated film under chloroform. The P2VP blocks were then quaternized and crosslinked to various extents using 5 wt% of iodomethane.PS-b-P2VP films showed excellent photonic bands at 630 nm after swelling with ethanol and 661 nm with water after treated with Calcium Carbonate. We observed significant band shift from 663 nm (deep red) to 531 nm (green) during UV-irradiation for 40 seconds.The phase separation process of BCP was very sensitive to the film thickness. The quarternized films with thickness varied from 0.43 mm (446 nm transmittance minimum) to 0.25 lm (478 nm transmittance minimum). This study shows that the total film thickness and UV irradiation effectively change the transmittance band by affecting the thickness of layers consisting of PS-b-P2VP photonic crystals.

Effect of Electric Fields on the Hydrogel-Photonic Gel Hybrid Device

“…For example, the reflection color obtained from photonic gel film swollen by DI water, ethyl alcohol and saturated CaCO 3 solutions had reflection color were reddish, greenish-blue and deep red, respectively. In particular the drastic shift in reflectance and narrowing optical band-width were obtained by swelling with saturated CaCO 3 solutions [18].…”

P‐111: Reflection Image Enhacement Using Alkylated Imidazolium Ionic Liquid

“…Figure 1 shows the molecular structure of PS-b-P2VP block copolymer after quaternizing process. [15][16][17][18][19] The bis(trifluoromethanesulfonyl)imide, imidazolium (IL1) was synthesized. [13] The bis(trifluoromethanesulfonyl)imide, 1ethyl-3-methylimidazolium (IL2) was obtained from CTRI IONIC LIQUIDS.…”

“…There are variety of photonic crystals with three different dimensional structures: 1-, 2-, and 3-dimensions (D). [10][11][12][13][14][15][16][17][18][19] Basically, the photonic crystals have a regular lattice structure which has more than two dif-ferent dielectric media. When the dielectric constants of the media are fixed, photonic band gap (PBG) is altered by changing the spacing of the lattice structure.…”

Recent Advances in Block Copolymer Self‐Assembly for the Fabrication of Photonic Films and Pigments

“…By unlocking a pathway to fabricate photonic films from LBCPs that do not possess large molecular weights, this approach has now been extensively emulated to fabricate a wide range of stimuli-responsive PS-b-P2VP photonic films. Examples of stimuli used to tune the optical response have included pH, [39][40][41] electric field, [42][43][44][45][46][47][48] solvents, [49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67] pressure, [68] and temperature. [69] In addition, by blending nanoparticles into the domains of the lamellar structures, the reflected color can also be tuned.…”