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AssigneeJapan Science and Technology Corporation
InventorsKenji Takeda, Makoto Gonokami
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A 1,4-di-substituted diacetylene polymer that is soluble in organic solvent, is composed of a repeating unit represented by the general formula ═CR—C≡C—CR′═ (wherein, R and R′ represent identical or different monovalent organic substituents), and has an average degree of polymerization of 4 to 200 and a ratio (Mw/Mn) of weight average molecular weight (Mw) to number average molecular weight corresponding to said average degree of polymerization (Mn) of 1.1 to 5.0, and a process for producing the 1,4-di-substituted diacetylene polymer by irradiating a solution of the soluble 1,4-di-substituted diacetylene polymer with laser light having a wavelength within the range of 250 to 1,200 nm, and preferably 550 to 900 nm, to cause a photodegradation reaction of said polymer, or heating a solution of the soluble 1,4-di-substituted diacetylene polymer to a temperature of 100 to 300° C. to cause thermal degradation of said polymer; and 1,4-di-substituted diacetylene polymers for which the average degree of polymerization and molecular weight distribution are controlled to within predetermined ranges, a production process that enables that control, useful composite compositions based on the 1,4-di-substituted diacetylene polymers, and constitutions of materials in which said composite compositions are used.
A process for producing a 1,4-di-substituted diacetylene polymer comprising the step of irradiating a solution consisting essentially of dissolved 1,4-di-substituted diacetylene polymer in a polar solvent with a concentration of 10 to 500 mg of 1,4-disubstituted diacetylene polymer/100 ml of polar solvent, with laser light having a wavelength within the range of 250 to 1200 nm, to cause a photodegradation reaction of said polymer, wherein the irradiation time is from 10 seconds to 180 minutes;
A process for producing a 1,4-di-substituted diacetylene polymer comprising the step of heating a solution consisting essentially of dissolved 1,4-di-substituted diacetylene polymer in a polar solvent with a concentration of 10 to 500 mg of 1,4-disubstituted diacetylene polymer/100 ml of polar solvent to a temperature of 100 to 300° C. to cause thermal degradation of said polymer, wherein the heating time is from 30 minutes to 5 hours;
Dependencies are inferred from the claim text.