Dont think it will solve black money. But it has benefits like
1. Polymer/Plastic Banknote has life span of 5 years but paper notes have only one year.
2. It will be cleaner than paper notes.
3. It cant be easily imitated.
The polymer notes were first introduced in Australia to safeguard against counterfeiting of currency.
Besides Australia, other countries which have introduced plastic notes include New Zealand, Papua New Guinea, Romania, Bermuda, Brunei and Vietnam.