Lotsa people don't understand what the fork means in reality. I'll try to explain it in a simplified way on this case.

On the 1st of August 2017 a new blockchain was created. It was created as a copy of existing one. So all BTC addresses to exist prior to fork, exist on both blockchains now. Meaning if you send your BCH to address created prior to fork, your BCH will be sent to address within BCH blockchain, as it is now completely separate blockchain from BTC.

If you try to send your BCH to BTC address created after the fork, it does nothing. It is the same situation if you would send the BTC to made up address. Such transaction cannot be confirmed by any node.

It is basically the same question if it is possible to send BTC to Litecoin address for example. Answer is no, it is NOT.