Novel CO2‐responsive conductive polymer particles based on poly(N‐(3‐amidino)‐aniline) (or PNAAN) are reported in this work. A CO2‐responsive N‐(3‐amidino)‐aniline (NAAN) monomer is firstly synthesized with the pendant amidine group at the meta‐position of aniline (AN) and subsequently polymerized into the PNAAN polymer by chemical oxidation. Self‐assembly of PNAAN in turn forms the polymer particles. In the strong or weak acid media, the amidine group protonates into cationic amidinium and self‐stabilizes the PNAAN particles without the use of any stabilizers. The reaction media are found to affect the polymerization rate and self‐assembly of particles, and hence the size and size distribution of the resultant particles. The particles synthesized in strong basic media show CO2‐responsvie properties since the H+ released by dissolved CO2 (dCO2) can protonate the amidine group into hydrophilic amidinium group and result in swelling of the PNAAN particles. Zeta‐potential measurements show the reversible change of particle surface charges in the presence and absence of dCO2. Dynamic light scattering (DLS) measurements show the particle size linearly changed with dCO2 concentration in the range of 5 × 10?4 and 2.5 × 10?2 atm. This is the first reported CO2‐responsive polyaniline (PANI) particles for dCO2 sensing or reversible fixation of CO2. 相似文献
A multilayer barrier structure composed of silicon nitride, silicon oxide, and encapsulated parylene on a polycarbonate substrate has been investigated for flexible electronic applications. The organic buffer is commonly used as the smoothing, strengthening and defect‐decoupling layer. However, a lateral leakage problem was observed in the organic interlayer, and resulted in increased permeation and poor adhesion between organic and inorganic layers. It was found that an encapsulated, thermal‐treated parylene interlayer can be used to efficiently reduce the water vapor and oxygen permeation. After 75 d, the water vapor transmission rate (WVTR) can reach 2.5 × 10−7 (g · m−2) d−1, as calculated by the calcium test. After being flexed for 5 000 times, the WVTR value almost keeps around 2.1 × 10−6 (g · m−2) d−1. The performance of the proposed multilayer barrier structure has a high potential for flexible solar cell and organic light‐emitting diode applications.
The total synthesis of (±)-methyl 3-(3-isocyano-6-oxabilcyclo[3.1.0]hex-2-en-5-yl)-2-propenoate has been achieved using 3-tosyl-2-azabicyclo[2.2.1]hepta-2,5-diene as a key starting material. 相似文献
