Synthesis of membranes of poly(vinyl ether)s and their gas permeability

Abstract

Cationic polymerizations of various vinyl ethers with cyclic substituents were performed with BF 3 OEt 2 . The polymers had relatively high molecular weight (M n : 18,900-132,000), although the polymerization of phenyl vinyl ether did not proceed. According to differential scanning calorimetry, the obtained poly(vinyl ether)s showed higher glass transition temperatures than room temperature. These poly(vinyl ether)s gave free-standing membranes both by a solution-casting method and by a hot-press method. In the membranes prepared by solution-casting, the oxygen permeability coefficients of these membranes were in the range of 0.81-6.01 barrers, and poly(2-adamanthyl vinyl ether) showed the highest gas permeability among them. Gas permeability of the membranes prepared by hot-press was lower than that of the membranes prepared by solution-casting.

Synthesis of poly(vinyl ether)-based, ABA triblock-type thermoplastic elastomers with functionalized soft segments and their gas permeability

“…The gas permeability of the series of the triblock copolymers to various gases was examined at 25 °C. Table shows the results, along with the data for poly(2‐AdVE) (hard segment‐based homopolymer) for comparison. The permeability coefficients ( P ) of poly(2‐AdVE) to oxygen, nitrogen, and carbon dioxide were 6.01, 1.69, and 25.2 barrer, respectively.…”

Cationic cyclopolymerization of divinyl ethers with norbornane‐, norbornene‐, or adamantane‐containing substituents: Synthesis of cyclopoly(divinyl ether)s with bulky rigid side chains leading to high glass transition temperature

“…Comparison of poly(1), poly(2), and poly(3) with poly(4), poly (5), and other reported poly(vinyl ether)s and poly(divinyl ether)s . 8,9,16,17,19,34,35 indicates that the combination of cyclized repeating units and polycyclic substituents makes vinyl ether polymers a new class of plastic materials with high T g .…”

“…[10][11][12][13] In contrast, the polymers of vinyl ethers with an aliphatic polycyclic substituent are a new class of poly(vinyl ether)s with high T g 's well above room temperature. [14][15][16][17][18][19][20] For example, we reported that the polymer of vinyl ether with a tricyclodecane unit (8-vinyloxytricyclo[5.2.1.0 2,6 ]decane; TCDVE) exhibited high T g (e.g., 100 C) and high thermal stability [e.g., thermal decomposition temperatures (T d ) 5 350 C]. 14 Poly(TCDVE) was found to form transparent optical plastics with relatively high refractive index and high hydrophobicity.…”

Enhancement of CO2 permeability of poly(vinyl ether)s having oxyethylene chains by the sequence control of crosslinking sites

“…11 We have been studying the membranes of poly(vinyl ether)s for CO 2 separation. [13][14][15][16][17] Among them, poly(vinyl ether)s having oxyethylene chains are wholly amorphous and have high content of oxyethylene units, and therefore they exhibit high gas permeability and high CO 2 permselectivity. However, the homopolymers of vinyl ethers having oxyethylene chains are sticky liquid, whose T g 's are À50 to À20 C. The copolymerization with other vinyl ethers such as 2-admantyl vinyl ether and vinyloxy ethoxy ethyl methacrylate [VEEM] is needed for the preparation of polymer membranes.…”