Thermoset dampener material

Abstract

Thermoset compositions useful for dampening vibrations at elevated temperatures are disclosed. The thermoset compositions may have a glass transition temperature of 150° C. or greater, a tan δ peak of 0.2 or greater, and a tan δ peak width measured at half-height larger than about 40° C., as measured by dynamic thermo-mechanical analysis (DMTA) at a frequency of 1 Hz. The thermoset compositions may be used to dampen vibrations at temperatures in excess of 100° C.

What is claimed: 
     
         1 . A composite having improved dampening properties at elevated temperatures, comprising:
 a thermoset composition disposed on a substrate to form the composite;   the thermoset composition having:
 a glass transition temperature of 150° C. or greater, 
 a tan δ peak of 0.2 or greater, and 
   a tan δ peak width measured at half-height larger than about 40° C., as measured by dynamic thermo-mechanical analysis (DMTA) at a frequency of 1 Hz;   wherein the composite is exposed to vibrations at temperatures of 100° C. or greater.   
     
     
         2 . The composite of  claim 1 , wherein the thermoset composition comprises:
 a crosslinked composition comprising the reaction product of a curable composition comprising at least one thermosetting resins and at least one hardener;   wherein the thermosetting resin comprising at least one of an epoxy, a phenolic resin, a vinylic resin, a cycloaliphatic epoxy resin, and a cyanate ester-based resin.   
     
     
         3 . The composite of  claim 2 , wherein the thermoset composition further comprises a high temperature resistant thermoplastic resin. 
     
     
         4 . The composite of  claim 3 , wherein the high temperature resistant thermoplastic resin is selected from the group consisting of a polyetherimides, a polyphenylene ether, a polyoxyphenylene, a polysulphone, a syndiotactic polystyrene, a polyaryl ether ketone, a polycarbonate, an acetal, a polyimide, and a polyarylene sulfide. 
     
     
         5 . The composite of  claim 1 , wherein the thermoset composition further comprises at least one of a catalyst, an inorganic filler, a solvent, a toughening agent, and a fibrous reinforcement. 
     
     
         6 . A thermoset composition having improved dampening properties at elevated temperatures, comprising:
 a reaction product of a curable composition comprising at least one thermosetting resin and at least one hardener;   wherein the thermoset composition has:
 a glass transition temperature of 150° C. or greater, 
 a tan δ peak of 0.2 or greater, and 
   a tan δ peak width measured at half-height larger than about 40° C., as measured by dynamic thermo-mechanical analysis (DMTA) at a frequency of 1 Hz.   
     
     
         7 . The thermoset composition of  claim 6 , wherein the at least one thermosetting resin is selected from the group consisting of an epoxy, a phenolic resin, a vinylic resin, a cycloaliphatic epoxy resin, and a cyanate ester-based resin. 
     
     
         8 . The thermoset composition of  claim 7 , wherein the curable composition further comprises a high temperature resistant thermoplastic resin. 
     
     
         9 . The thermoset composition of  claim 8 , wherein the high temperature resistant thermoplastic resin is selected from the group consisting of a polyetherimides, a polyphenylene ether, a polyoxyphenylene, a polysulphone, a syndiotactic polystyrene, a polyaryl ether ketone, a polycarbonate, an acetal, a polyimide, and a polyarylene sulfide. 
     
     
         10 . The thermoset composition of  claim 6 , wherein the curable composition further comprises at least one of a catalyst, an inorganic filler, a solvent, a toughening agent, and a fibrous reinforcement.