Such polymers should have a very rigid backbone. For example - Aromatic Polyimides PI) like products obtained on the basis of Pyromellitic Dianhydride (PMDA) and para-Phenylenediamine (PDA). Coefficient of Thermal expansion of respective Polyimide is around 2ppm/K. Or PI obtained from BPDA+PDA, where BPDA is dianhydride containing Biphenylene moiety.