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The synthesis of the  poly(N-isopropylacrylamide-co-2-hydroxypropylmethacrylate) hydrogel along  with the analysis of the residual monomers content and influence of monomer  and crosslinker molar ratios on the swelling behaviour was investigated.  Synthesis of thermosensitive hydrogel based on N-isopropylacrylamide was  carried out with the molar ratios of 5, 10, 15 and 20 mol. % of monomer 2-  hydroxypropyl-methacrylate, in the presence of ethylene glycol dimethacrylate  as a crosslinker (1, 1.5, 2 and 3 mol. %) and  2,2'-azobis(2-methylpropionitril) as an initiator in acetone. The quantities  of residual monomers in the synthesized copolymers were determined by HPLC  method, ranging from 0.19 to 0.49 % for N-isopropylacrylamide and from 0.13  to 0.63 % for 2-hydroxypropyl-methacrylate, counting the amount of xerogel.  The hydrogels swelling ratio depending on time at 20 and 40°C was examined.  It was found that hydrogel with 5 mol. % 2-hydroxypropyl-methacrylate and 1  mol. % ethylene glycol dimethacrylate had the highest degree of swelling (α =  29.59) at 20°C, and that hydrogel with 20 mol. % 2-hydroxypropyl-methacrylate  and 3 mol. % ethylene glycol dimethacrylate had the lowest swelling degree (α  = 2.17) at 40°C

Influence of monomer and crosslinker molar ratio on the swelling behaviour of thermosensitive hydrogels