1460998899-1eb1e2cb-6273-46bb-a031-9bd1366e932f

A new series of wholly aromatic polys containing pendant sulfonic acid groups were conveniently prepared by potassium carbonate mediated nucleophilic polycondensation reactions of inexpensive commercially available monomers: 1,3-bisbenzene, sodium 6,7-dihydroxy-2-naphthalenesulfonate, and 4,4\u2032-biphenol or hydroquinone in N-methyl-2-pyrrolidone at 170\xb0 C. The keywords are displayed along with a use value that reflects the number of times users have voted or selected the keyword as being relevant or effective in a review of a product. These unique structures exhibit islands of PTFE attached to and raised above the expanded PTFE structures. The rack with the cable reel can be placed in the machine so that the rack and the cable reel rest on the machine, so that the flanges of the cable reel are in contact with the drive wheels. The first Cu plating film is disposed on the underlying electrode layer.