Synthesis and CO sub(2) Permeation Selectivity of Poly(diphenylacetylene)s with Ester, Hydroxy, and Mercapto Side Groups

• Published in: Kōbunshi ronbunshū (Tokyo) Vol. 73; no. 3; pp. 326 - 329
• Main Authors: Kaji, Shintaro, Sakaguchi, Toshikazu, Hashimoto, Tamotsu
• Format: Journal Article
• Language: English
• Published: 25.12.2014
• Subjects: Affinity; Carbon dioxide; Diffusivity; Esters; Hydrolysis; Permeability; Selectivity; Separation
• ISSN: 0386-2186; 1881-5685
• DOI: 10.1295/koron.2016-0006

Ester-containing poly(diphenylacetylene) (2) was synthesized by substitution of CH sub(3)CO sub(2) super(-) with bromoethyl groups in the side chains of the polymer (1). Hydrolysis of ester of 2 resulted in a polymer (3) with hydroxy groups. Thiol-containing polymer (5) was synthesized by hydrolysis of thiourea-containing polymer (4). The carbon dioxide permeability coefficient (P sub(CO2)) and separation factor (P sub(CO2)/P sub(N2)) of 2 were 230 barrer and 23, respectively. Polymer 3 showed good CO sub(2) separation, and the P sub(CO2) and P sub(CO2)/P sub(N2) were 290 barrer and 26, respectively due to the suitable affinity of hydroxy groups to CO sub(2). In contrast, polymer 5 showed lower permeability and selectivity, and the P sub(CO2) and P sub(CO2)/P sub(N2) were 130 barrer and 15, respectively. This can be explained by the fact that the presence of mercapto groups decreased CO sub(2) diffusivity because of strong interaction of mercapto groups with CO sub(2).