Novel thermosetting resin composition is provided. A thermosetting resin composition containing a polymer having a repeating structural unit of the following Formula (1-a): ##STR00001##
(wherein each of R.sup.1 and R.sup.2 is independently a hydrogen atom, a C.sub.1-4 alkyl group, phenyl group, or a C.sub.3-6 cyclic alkyl group, X is a single bond or a divalent organic group, and Y is a divalent organic group), and a terminal structure of the following Formula (1-b): ##STR00002##
(wherein Q is a C.sub.1-5 alkylene group, phenylene group in which at least one hydrogen atom may be substituted by a halogen atom, or a 5- or 6-membered divalent saturated heterocyclic group containing at least one nitrogen atom, and R.sup.3 is a hydrogen atom or methyl group).

A composition comprises a compound and a solvent. The compound comprises a carbon-carbon triple bond-containing group, and at least one partial structure having an aromatic ring. A total number of benzene nuclei constituting the aromatic ring in the at least one partial structure is no less than 4. The at least one partial structure preferably comprises a partial structure represented by formula (1). The sum of p1, p2, p3 and p4 is preferably no less than 1. At least one of R.sup.1 to R.sup.4 preferably represents a monovalent carbon-carbon triple bond-containing group. The at least one partial structure also preferably comprises a partial structure represented by formula (2). The sum of q1, q2, q3 and q4 is preferably no less than 1. At least one of R.sup.5 to R.sup.8 preferably represents a monovalent carbon-carbon triple bond-containing group.

##STR00001##

There is provided an aromatic hydrocarbon formaldehyde resin obtained by reacting an aromatic hydrocarbon compound (A) represented by the following formula (1) with formaldehyde (B) in the presence of an acidic catalyst. ##STR00001##
wherein R represents an organic group having 1 to 10 carbon atoms; m and n represent integers satisfying 1m+n10, m0 and n1.

There is provided an aromatic hydrocarbon formaldehyde resin obtained by reacting an aromatic hydrocarbon compound (A) represented by the following formula (1) with formaldehyde (B) in the presence of an acidic catalyst. ##STR00001##
wherein R represents an organic group having 1 to 10 carbon atoms; m and n represent integers satisfying 1m+n10, m0 and n1.

Aspects of the present disclosure provide fluoropolymers and methods for forming and using such fluoropolymers. Fluoropolymers include polyfluorobenzoxazines and polyfluoroimides. Methods for forming polyphthalonitriles are also provided. The present disclosure is further directed to compositions containing one or more fluoropolymers and one or more metal oxides.

Aspects of the present disclosure provide fluoropolymers and methods for forming and using such fluoropolymers. Fluoropolymers include polyfluorobenzoxazines and polyfluoroimides. Methods for forming polyphthalonitriles are also provided. The present disclosure is further directed to compositions containing one or more fluoropolymers and one or more metal oxides.