SEARCH Articles Figures Tables Cellulose hydroxyl groups urethanated Film hydroxyl groups urethanated Hydroxyl group reactions urethanes Protecting groups urethane-type Siloxane Groups and Urethanes Linking Units into PEO Urethane groups, thermal stability Urethane substituent groups Urethane type protective group Urethane-type blocking groups Urethane/urea chemistry functional groups Urethanes carbonyl groups Urethanes protecting groups