Claims
- 1. A polymeric alloy comprising a mixture of a flexible, coil-like heterocyclic polymer and a reinforcing amount of a rod-like aromatic heterocyclic polymer, the coil-like heterocyclic polymer consisting essentially of repeating units having the following structural formulas: ##STR7## wherein X is NH, N.phi., O or S, where .phi. is phenyl, Ar' is ##STR8## and m is an integer having a value such that the polymer has an intrinsic viscosity of about 2 to 20 dl/g as determined in methanesulfonic acid at 30.degree. C., and the rod-like aromatic heterocyclic polymer consisting essentially of repeating units having the following formulas: ##STR9## where X is NH, N.phi., O or S, where .phi. is phenyl, Ar is ##STR10## and n is an integer having a value such that the polymer has an intrinsic viscosity of about 5 to 30 dl/g as determined in methanesulfonic acid at 30.degree. C.
- 2. The polymeric alloy according to claim 1 in which the coil-like heterocyclic polymer consists essentially of repeating units having the following structural formula: ##STR11## the rod-like aromatic heterocyclic polymer consists essentially of repeating units having the following structural formula: ##STR12##
- 3. The polymeric alloy according to claim 1 in which the coil-like heterocyclic polymer consists essentially of repeating units having the following structural formula: ##STR13## and the rod-like aromatic heterocyclic polymer consists essentially of repeating units having the following structural formula: ##STR14## .
- 4. As an article of manufacture, a composite film comprising as a matrix a flexible, coil-like heterocyclic polymer, and embedded in the matrix a reinforcing amount of a rod-like aromatic heterocyclic polymer, the coil-like heterocyclic polymer consisting essentially of repeating units having the following structural formulas: ##STR15## , wherein X is NH, N.phi., O or S, where .phi. is phenyl, Ar' is ##STR16## and m is an integer having a value such that the polymer has an intrinsic viscosity of about 2 to 20 dl/g as determined in methanesulfonic acid at 30.degree. C., and the rod-like aromatic heterocyclic polymer consisting essentially of repeating units having the following structural formulas: ##STR17## wherein X is NH, N.phi., O or S, where .phi. is phenyl, Ar is ##STR18## and n is an integer having a value such that the polymer has an intrinsic viscosity of about 5 to 30 dl/g as determined in methanesulfonic acid at 30.degree. C.
- 5. The composite film according to claim 4 in which the coil-like heterocyclic polymer consists essentially of repeating units having the following structural formula: ##STR19## and the rod-like aromatic heterocyclic consists essentially of repeating units having the following structural formula: ##STR20## .
- 6. The composite film according to claim 4 in which the coil-like heterocyclic polymer consists essentially of repeating units having the following structural formula: ##STR21## and the rod-like aromatic heterocyclic polymer consists essentially of repeating units having the following structural formula: ##STR22## .
- 7. The composite film according to claim 4 in which polymer chains of the rod-like aromatic heterocyclic polymer are uniaxially oriented.
- 8. A method for preparing a composite film which comprises the steps of:
- a. dissolving in methanesulfonic acid solvent a mixture of a flexible, coil-like amorphous heterocyclic polymer and a para ordered, rod-like aromatic heterocyclic polymer, the amount of polymers dissolved being sufficient to provide a 1 to 30 percent solution of the polymer mixture in the solvent and the polymer mixture containing about 5 to 50 weight percent of the rod-like polymer, the coil-like heterocyclic polymer consisting essentially of repeating units having the following structural formulas: ##STR23## wherein X is NH, N.phi., O or S, where .phi. is phenyl, Ar' is ##STR24## and m is an integer having a value such that the polymer has an intrinsic viscosity of about 2 to 20 dl/g as determined in methanesulfonic acid at 30.degree. C., and the rod-like aromatic heterocyclic polymer consisting essentially of repeating units having the following structural formulas: ##STR25## where X is NH, N.phi., O or S, where .phi. is phenyl, Ar is ##STR26## and n is an integer a value such that the polymer has an intrinsic viscosity of about 5 to 30 dl/g as determined in methanesulfonic acid at 30.degree. C.
- b. introducing the polymer solution into a casting mold;
- c. removing solvent from the polymer solution, thereby forming a composite film in the mold;
- d. recovering the composite film from the mold; and
- e. drying the recovered composite film.
- 9. The method according to claim 8 in which the amount of solvent removed from the polymer solution in step c is such that residual solvents remains in the composite film, the concentration of the solvent being about 1 to 30 weight percent; the composite film containing residual solvent after being recovered from the mold is elongated, thereby subjecting polymer chains of the rod-like polymer to uniaxial orientation; and the residual solvent is leached from the uniaxially oriented composite film by contacting same with a non-solvent for the polymers.
- 10. The method according to claim 9 in which the residual solvent is leached from the composite film by applying the nonsolvent to the film while it is under tension during uniaxial orientation.
- 11. The method according to claim 10 in which the coil-like heterocyclic polymer consists essentially of repeating units having the following structural formula: ##STR27## and the rod-like aromatic heterocyclic polymer consists essentially of repeating units having the following structural formula: ##STR28##
- 12. The method according to claim 10 in which the coil-like heterocyclic polymer consists essentially of repeating units having the following structural formula: ##STR29## and the rod-like aromatic heterocyclic polymer consists essentially of repeating units having the following structural formula: ##STR30## .
RIGHTS OF THE GOVERNMENT
The invention described herein may be manufactured and used by or for the Government of the United States for all governmental purposes without the payment of any royalty.
Foreign Referenced Citations (1)
Number |
Date |
Country |
1122925 |
Aug 1968 |
GBX |