Fig. 3From: Polymerization of a new thermo-responsive copolymer with N-vinylcaprolactam and its application in recyclable aqueous two-phase systems with another thermo-responsive polymerFTIR spectrum of PVBAm. The polymer was introduced using the KBr method, the experimental wavelength used was the mid infrared band (4000–400 cm−1) and the resolution 4 cm−1Back to article page