Polycarbonate polymers comprising non-aromatic cyclic groups bonded with carbonate linking groups are described. A portion of the non-aromatic cyclic groups comprise a substituent having siloxane repeat units. Representative formulas of the substituents having siloxane repeat units include CH.sub.2CH.sub.2Si(R.sup.4).sub.2(OSi(R.sup.4).sub.2R.sup.5, and CH[Si(R.sup.4).sub.2(OSi(R.sup.4).sub.2).sub.mR.sup.5]CH.sub.3; wherein m is the number of siloxane repeat units; and R.sup.4 and R.sup.5 are independently alkyl, aryl, aralkyl or aralkylene. The polycarbonate polymer C typically comprises a high concentration of carbonate linking group, for example in an amount of at least 85 or 90 mol % or greater N based on the total linking groups of the polymer. Also described are compositions comprising the polycarbonate polymer and methods of making.