A well-defined block copolymer synthesis via living cationic polymerization and nitroxide-mediated polymerization using carboxylic acid-based alkoxyamines as a dual initiator

A series of carboxylic acid-based alkoxyamines associated with SnBr4, a Lewis acid, have been used as protonic acids of a binary initiating system to control the cationic polymerization of vinyl ether.

Preparation and Thermoelectric Properties of Polyaniline Doped with Protonic Acids

Hydrochloric acid doped polyaniline and camphor sulfonic acid doped polyaniline were prepared by oxidative chemical polymerization and grinding, respectively. The structures of polyaniline samples were measured by Fourier transform infared spectroscopy. The Seebeck coefficient and electrical conductivity of the composites were investigated as protonic acid content in the temperature range from room temperature to 380K. The highest electrical conductivity of the 1M hydrochloric acid doped polyaniline reaches 5.57×102S/m at 320K, and the mass ratio of 1:1 camphor sulfonic acid doped polyaniline reaches 5.97×102S/m at 380K. This work suggests that a new method improves the thermoelectric properties of conducting polymers.

Study of the Influence of Different Synthesis Conditions of PANI-HF in its Property as Ammonia Gas Sensor

ntrinsically Conducting Polymers (ICPs) are of increasing interest, especially in areas such as electronic devices. PANI is one of the most intensively investigated of the ICPs due to its easy chemical synthesis, easy doping process by protonic acids and also because it is chemically stable at room temperature conditions. PANI is used as sensor for many gases that are responsive for air pollution The applicability of these materials as sensors is based on their selectivity over a wide range of analyte molecules and low level of gas concentration, the potential to operate at or near room temperature and also its response time. The present work studies the influence of different synthesis conditions of PANI-HF in its electrical resistance when subjected to the presence of ammonia gas. The PANI-HF was chemically synthesized and it was submitted to electrical and physical characterization. The preview results showed that the synthesis conditions change significantly the response of PANI-HF to ammonia gas.