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Effect of sodium hydroxide solution as polymerization solvent and activator on structural, mechanical and antibacterial properties of PNIPAAm and P(NIPAAm–clay) hydrogels
Author(s) -
Yalçın Bestenur,
Erbil Candan
Publication year - 2018
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.24490
Subject(s) - self healing hydrogels , materials science , sodium hydroxide , polymerization , montmorillonite , titration , polymer chemistry , radical polymerization , antibacterial activity , fourier transform infrared spectroscopy , nuclear chemistry , hydroxide , composite number , chemical engineering , composite material , chemistry , organic chemistry , polymer , engineering , biology , bacteria , genetics
Poly( N ‐isopropylacrylamide) (PNIPAAm) and its composite hydrogels were synthesized by free‐radical polymerizations in NaOH solutions (0.1, 0.2 N). Laponite (LP), Montmorillonite (MMT) and ODA(octadecylamine)‐MMT were used as inorganic multicrosslinkers while BIS was chosen as conventional crosslinker. All polymerizations were initiated with KPS alone. The effects of two different concentrations of NaOH‐KPS redox pair and long reaction times (1w and 2w) at 25°C on structural and mechanical properties, antibacterial and haemolytic activities of the modified hydrogels were studied by conductometric titrations, FTIR, XRD, EDX, compression, inhibition zone and haemolysis tests. Their homogenities, compressive moduli at 37°C, antibacterial activities and blood compatibilities increased with increasing reaction time and NaOH concentration. POLYM. COMPOS., 39:E386–E406, 2018. © 2017 Society of Plastics Engineers