It does not make a difference whether the polymer is converted from the dimethylsulfonium precursor salt (5) or from the cyclic sulfonium precursor salt (10).
A number of precursor salts have been tried and these can be classified into two categories: those containing dialkyl sulfonium pendant groups such as dimethyl sulfonium and those containing cyclic sulfonium groups such as tetrahydrothiophenium (Fig.
Bradley (7, 8) gave detailed infrared assignments and some transition moment angles of PPV converted from dialkyl sulfonium precursor.
In this study, the anisotropic structure of unstretched and stretched PPV films synthesized through the cyclic sulfonium precursor was studied.
In this work, a sulfonium salt PAG, triphenylsulfonium triflate, has been modified to allow its use as a crosslinking agent for a phenolic matrix polymer.
Synthesis of Sulfonium Salt PAGs Containing Vinyl Ether Groups
Esacure 1187 is a modified hexafluor-ophosphate sulfonium salt, used as a clear and stable solution at 75% wt of pure product in propylene carbonate.
For this, the vinyl ether precursor was mixed with a sulfonium salt hexafluorophosphate in the presence of a minimum amount of acetone acting as a co-solvent to form a homogeneous photolatent solution, which was then irradiated with an Hg-Xe lamp at an in-tensity of 200 mW/[cm.
Salts as Latent Thermal Initiators for Cationic Polymerization," JOURNAL OF COATINGS TECHNOLOGY, 53, No.
Recently, the use of a number of sulfonium
salts for thermally induced cationic polymerization has been reported (16), (17).
Cationic starches are produced from starch with reagents containing amino, ammonium, sulfonium
, or phosphonium groups, which are able to carry a positive charge .