Multidimensional ester or ether oligomers with pyrimidinyl end caps
AssigneeThe Boeing Company
InventorsHyman R. Lubowitz, Clyde H. Sheppard
Life of this patent
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Abstract
High performance composites can be made from linear or multidimensional oligomer or blends that include unsaturated hydrocarbon crosslinking functionalities linked to a pyrimidine radical on the terminal ends of the polymeric backbones of the oligomers. The oligomers are made by condensing pyrimidine-based end-cap monomers of the formula: ##STR1## wherein R.sub.1 =lower alkyl, lower alkoxy, aryl, aryloxy, substituted alkyl, substituted aryl, halogen, or mixtures thereof; j=0, 1, or 2; G=--CH.sub.2 --, --O--, --S--, --SO--, --CO--, --CHR--, --CR.sub.2 --, or --SO.sub.2 --; T=methallyl or allyl; Me=methyl; and R=hydrogen, lower alkyl, or phenyl, with suitable polymeric precursors.
Claims14
A multidimensional oligomer useful for preparing high performance, advanced composites, comprising:
- Ar--(P).sub.m --(E)--].sub.w
- wherein
- w=a small integer greater than or equal to 3;
- Ar=an aromatic radical or valency w;
- P=a divalent hydrocarbon radical;
- m=a small integer, generally from 0-5;
- E= ##STR122## wherein R.sub.1 =lower alkyl, lower alkoxy, aryl, aryloxy, substituted alkyl, substituted aryl, halogen, or mixtures thereof;
- j=0, 1, or 2;
- G=--CH.sub.2 --, --O--, --S--, --SO--, --CO--, --CHR--, --CR.sub.2 --, or --SO.sub.2 --;
- T=methallyl or allyl;
- Me=methyl;
- and
- R=hydrogen, lower alkyl, or phenyl.
A method for making a multidimensional oligomer comprising the step of simultaneously condensing under an inert atmosphere in a suitable solvent an aromatic hub of the formula:
- Ar--(B).sub.w wherein:
- Ar=an aromatic radical of valency w;
- w=a small integer greater than or equal to 3;
- B=--OH, --COX, or --X;
- and
- X=halogen
- with an end-cap monomer of the formula:
- E--Z
- wherein
- Z=--OH, if B=--COX or --X, and --X, if B=--OH;
- E= ##STR123## wherein R.sub.1 =lower alkyl, lower alkoxy, aryl, aryloxy, substituted alkyl, substituted aryl, halogen, or mixtures thereof;
- j=0, 1, or 2;
- G=--CH.sub.2 --, --O--, --S--, --SO--, --CO--, --CHR--, --CR.sub.2 --, or --SO.sub.2 --;
- T=methallyl or allyl;
- Me=methyl;
- and
- R=hydrogen, lower alkyl or phenyl,
- provided that R.sub.1 .noteq.halogen, if B=halogen.
Dependencies are inferred from the claim text.