*2.1. Materials*

Polyethyleneterephthalate non-textured fabric (ROGA-0715 Texlon Corp. Torrance, CA, USA), was cut into 9 cm × 9 cm samples for photochemical grafting and into 1 cm × 5 cm for radiation grafting; this was due to the size of the molds used in each reactor. These were then washed with hot water for 24 h in a Soxhlet apparatus, and finally, each sample was dried under vacuum until constant weight. Ethylene glycol dimethacrylate (EGDMA) 98%, 2-hydroxyethyl methacrylate (HEMA), poly (ethylene glycol) methacrylate Mn = 526 (PEGMA), and poly (ethylene glycol) methyl ether methacrylate Mn = 300 (PEGMA300), (Sigma-Aldrich Chemical Co., Toluca, México) were purified by passing through an inhibitor remover column (Aldrich Chemical Co., St. Louis, MO, USA) before use. Sodium borohydride (NaBH4) 98%, 1, 2-diphey l-2, 2-dimethoxyethanone 99%, Irgacure ® 651, and silver nitrate P. A. ACS 99% (AgNO3) (all from Sigma-Aldrich Chemical Co., Toluca, México) were used as received.
