Keywords: GA, glutaric anhydride; HHPA, hexahydrophthalic anhydride; MA, maleic anhydride; NA, 5-norbornene-2,3-dicarboxylic anhydride; PA, phthalic anhydride; PO, propylene oxide; SA, succinic anhydride; THPA, tetrahydrophthalic anhydridePoly(propylene carbonate);