Structure of the polysulfones of some conjugated dienes

Soluble and Thermally Stable Polysulfones Prepared by the Regiospecific and Alternating Radical Copolymerization of 2,4-Hexadiene with Sulfur Dioxide

“…Our hypothesis for interpreting the solubility of the poly(diene sulfone)s is as follows: the symmetry of the repeating structure of the diene unit in the polymer chain is related to the solubility. Namely, poly(BD- alt -SO 2 ) has no asymmetric carbon center in the main chain because the diene units exclusively consist of the trans-1,4 repeating structure. − ,, Such a symmetric polymer chain structure is favored for partial crystallization, resulting in the poor solubility of poly(BD- alt -SO 2 ). Poly(HD- alt -SO 2 ) includes asymmetric centers in the main chain.…”

“…Namely, poly(BD-alt-SO 2 ) has no asymmetric carbon center in the main chain because the diene units exclusively consist of the trans-1,4 repeating structure. [18][19][20][21][22][23][24][25][26]31,32 Such a symmetric polymer chain structure is favored for partial crystallization, resulting in the poor solubility of poly(BD-alt-SO 2 ). Poly(HD-alt-SO 2 ) includes asymmetric centers in the main chain.…”

“…In contrast with the significant number of investigations for the synthesis and characterization of the poly(vinyl sulfone)s, only a few reports have been published regarding the poly(diene sulfone)s, which were prepared by the copolymerization of 1,3-diene monomers with SO 2 . For example, the alternating radical copolymerization of 1,3-butadiene (BD), − isoprene (IP), and 1,3-cycloalkadienes − as well as the random copolymerization of chloroprene with SO 2 were reported, but the details of the structure and properties of the copolymers have not been investigated. In 1970, Bauer et al reported the high crystallinity and the poor solubility of poly(butadiene sulfone) prepared by emulsion polymerization.…”

Thermally Stable Polysulfones Obtained by Regiospecific Radical Copolymerization of Various Acyclic and Cyclic 1,3-Diene Monomers with Sulfur Dioxide and Subsequent Hydrogenation

“…Especially, the regiospecific polymerization of diene monomers is required because the physical properties of diene polymers significantly depend on the repeating structure of the diene monomer units. − Highly regiospecific propagation has recently been reported for the alternating radical copolymerization of 1,3-diene monomers with O 2 and SO 2 . − It was demonstrated in our previous study that poly(diene sulfone) (PDS) could be synthesized by the regiospecific radical copolymerization of 2,4-hexadiene ( M5 in Chart ) with SO 2 and the transformation of the PDS into a thermally stable polymer by the hydrogenation of the carbon-to-carbon double bond of the main chain . Very few reports on the copolymerization of other diene monomers with SO 2 as well as the properties of the resulting PDSs have been published, − being in contrast to the high number of studies on the synthesis and characterization of the PDSs produced from olefins. − …”

Sulfur-containing polymers derived from SO2: synthesis, properties, and applications

“…However, the copolymers are resistant to oxidation and bromination, from which it has been speculated that they have an all-1,4 rather than a 1,2 or 3,4 structure. 79,80 In 2010, Matsumoto's studied the structures and properties of the copolymers produced from the copolymerization of SO 2 with conjugated dienes (Table 1). [81][82][83] In each case, alternating copolymers with exclusive conjugated dienes were detected.…”