Solution of a chalcogen containing polymer in {HEAD ~ acids} and {TAIL ~ process} of forming polymer articles therefrom 
Solution of a chalcogen containing polymer in { HEAD ~ acids } and { TAIL ~ process } of forming polymer articles therefrom
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH