New cationic linear copolymers and hydrogels of N -vinyl caprolactam and N -acryloyl- N′ -ethyl piperazine : synthesis, reactivity, influence of external stimuli on the LCST and swelling properties

• Main Authors: Deen, Gulam Roshan, Lim, Eu Kiat, Mah, Chin Hao, Heng, Kuang Meng
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2013
• Subjects: DRNTU::Science::Chemistry
• Online Access: https://hdl.handle.net/10356/100995; http://hdl.handle.net/10220/16757
• Institution: Nanyang Technological University

New cationic linear copolymers of N-vinyl caprolactam (VCL) and N-acryloyl-N′-ethyl piperazine (AcrNEP) were synthesized by thermal free-radical solution polymerization in dioxane at 75 °C. The chemical composition of the copolymers was determined by 1H NMR spectroscopy. The copolymers were water-so...