Dual-Functional Emulsifying/Antifogging Coumarin-Containing Polymeric Micelle

Abstract

Dual-functional emulsifying/antifogging polymeric micelles have been prepared by the self-assembly of poly(2-(dimethylamino)ethyl methacrylate-co-methyl methacrylate-co-7-acryloxy-4-methylcoumarin) P(DMAEMA-co-MMA-co-AOM). On one hand, the polymeric micelles have spherical morphology and exhibit triple responsive behaviors. The sample with the DMAEMA/MMA/AOM molar ratio of 5/3/3 (T2) is chosen to investigate the influence of pH on the emulsifying performance, and the configuration of polymeric micelles on the oil/water interface is investigated. The amount of micelles arranged on the surface of solidified polymerized beads gradually decreases as the pH changes from 12 to 5, and then total phase separation and demulsification occur at pH 3. On the other hand, we prepare an effective antifogging coating by forming an interchain network (ICN) resulting from self-assembled micelles and photo-cross-linked coumarin units. The ICN-T2 coating can not only absorb water vapor rapidly but also avoid excessive swelling of the amphiphilic terpolymer, thus leading to excellent antifogging performance. To the best of our knowledge, the photo-cross-linkable coumarin derivative is first introduced into an antifogging polymer coating at the molecular level, successfully avoiding the use of chemical cross-linking agents. The coumarin-containing polymeric micelle may be applied in many industrial processes and will provide new insight into the interface or surface property of macromolecular materials.

pH/UV Responsive Polymeric Micelles Based on Coumarin to Tune Emulsification/Solidification Performance

“…Therefore, there were numerous reports on polymers as particulate emulsifiers to control Pickering emulsions. Those polymers as particulate emulsifiers were distinguished by their response to external stimuli such as pH, temperature, carbon dioxide, or light, etc. In particular, coumarin‐containing light‐responsive polymers had been continually suggested as the promising candidate particulate emulsifier because of their unique molecular structures and photo‐cross‐linkable property …”

Long Conducting and Water-Compatible Polymer/Carbon Nanotubes Nanocomposite with “Beads-on-a-String” Structure as a Highly Effective Electrochemical Sensing Material

“…With prolonging the irradiation time, the characteristic absorbance of the coumarin group at 320 nm continuously decreased, indicating UV light-induced dimerization of neighboring coumarin moieties in PAVE NPs. 34 The photodimerization degree (PD) of coumarin moieties in PAVE NPs at different irradiation times is depicted in the inset of Figure 4a, manifesting that most of coumarin moieties have been cross-linked after UV irradiation for 30 min with a maximum PD of about 60%. For PAVE-CNTs NCs with PAVE NPs wrapping around the CNTs surfaces, it is expected the photocross-linking of PAVE polymer beads would enhance the interactions between the polymer beads and CNTs surfaces and thus improve the long-term dispersion stability of CNTs as well as the structure stability of the integrated PAVE-CNTs NCs.…”

“…Figure a shows the UV–vis spectra of PAVE NPs aqueous solutions with increasing irradiation times by UV light (λ = 365 nm). With prolonging the irradiation time, the characteristic absorbance of the coumarin group at 320 nm continuously decreased, indicating UV light-induced dimerization of neighboring coumarin moieties in PAVE NPs . The photodimerization degree (PD) of coumarin moieties in PAVE NPs at different irradiation times is depicted in the inset of Figure a, manifesting that most of coumarin moieties have been cross-linked after UV irradiation for 30 min with a maximum PD of about 60%.…”

Dual-Responsive Graphene Oxide/Poly(NIPAM-co-AA) Hydrogel as an Adsorbent for Rhodamine B and Imidacloprid

“…Therefore, if the adsorbents have pH response characteristics, dissolution can effectively control the adsorption and desorption of target molecules by changing the pH value. Different to unstable hydrogels containing small molecules, stable hydrogels containing heavy functional groups, for instance, poly­(acrylic acid), have higher binding capacity. − …”