Diethylene glycol diacrylate deg da

Hydroxypropyl
cellulose (HPC)
was supplied by NIPPON SIDA CO., LTD, with a relative molecular weight
(M_w) of 40000. Tetraethylene glycol dimethyl
ether (TEG-DE, M_w = 222), diethylene glycol
ethyl ether acrylate (DEG-EEA, M_w = 188),
and diethylene glycol diacrylate (DEG-DA, M_w = 214) were purchased from Sigma-Aldrich Co. Ltd. Hydrochloric acid
(HCl, 37%) and glutaraldehyde were purchased from Fisher Scientific.
All remaining chemicals were of analytical grade and were employed
without any additional purification steps.

The main material used in this study is N-vinylcaprolactam (NVCL), which has a molecular weight of 139.19 g/mol, and was provided by Sigma Aldrich, Co. Dublin, Ireland, and should be stored at a temperature of 2 to 8 °C. The photoinitiator Diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide (TPO) was also obtained from Sigma Aldrich, Co. Dublin, Ireland. Diethylene glycol diacrylate (DEGDA) with a molecular weight of 214.22 g/mol, obtained from Sigma Aldrich, Co. Dublin, Ireland, was used as the crosslinker. VAc and NVP, with molecular weights of 86.09 g/mol and 111.14 g/mol, respectively, were also obtained from Sigma Aldrich, Co. Dublin, Ireland. The chemical structures of these materials are listed below in Table 3.