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Firstly, the initial solution consisting of monomer NIPAM (1.000 g), MBA (0.050 g), and SBS (0.0139 g) was dissolved in deionized water (100 mL) with stirring under [N.sub.2] for 30 min at 5[degrees]C.
Typically, 60 mL of the aqueous solution containing 0.14 g NIPAm (Aldrich), 10 [micro]L AAc (Aldrich), and 3.3 mg N'N'-methylene-bis-acrylamide (MBA, Aldrich) was charged, stirred, and degassed for a period of 30 minutes and heated at 60[degrees]C for a period of 5 minutes.
The small size monomers such as AAm (molar mass; 71.08 g [mol.sup.-1]) and AAc (72.06 g [mol.sup.-1]) can move rapidly and affect targets in a medium more than large size monomers such as MAAm (molar mass; 85.11 g [mol.sup.-1]) and NIPAm (113.16 g [mol.sup.-1]).
In the first step, the initial solution consisting of monomer NIPAM (1 g), clay (0.1 g), deionized water (10 mL) and various ratios of GO was stirred and sonicated in an ice-water bath for 2 h.
After the addition of the initiator, the polymerization of NIPAM monomer takes place and the chain starts to grow.
A special attention was paid to the N-substituted amides (co)polymers such N-isopropyl acrylamide (NIPAM), N-methyl methacrylamide (NMMAM), N-acryloyl morpholine (NaM), and so forth [9,10].
Importantly, the LCST of p(NIPAM) hydrogels can be controlled by incorporating more hydrophilic or hydrophobic monomer into the hydrogel structure.
N-Isopropyl acrylamide (NIPAM) (Fisher Scientific) was recrystallized once in hexane (Fisher Scientific) and stored at -20[degrees] C until use.
The Namibia Library & Information Council, the Ministry of Education and the libraries of the University of Namibia, the Polytechnic of Namibia and NIPAM, organised the first ever Namibia Library Symposium which took place from 7-9 October at the Safari Hotel & Conference Centre.