聚丙烯酰胺疏水缔合水凝胶的合成

Synthesis of Hydrophobic Association Hydrogels

以丙烯酰胺(AM)和自制疏水大单体(MM)及十二烷基苯磺酸钠(SDBS)为原料,利用胶束共聚的方法,合成了一系列疏水缔合水凝胶。利用傅里叶变换红外光谱对凝胶结构进行了表征,并对凝胶的溶胀行为进行了测试。结果表明,室温下,水凝胶的溶胀率随疏水大单体含量的增加而增大,溶胀达到平衡所需时间缩短。随温度的升高,溶胀所需要的时间缩短;随SDBS浓度的增大,凝胶的溶胀率降低;1%的NaCl水溶液中,凝胶的最大溶胀率显著减小,继续增大NaCl水溶液的浓度,最大溶胀率无明显改变。由于起物理交联作用胶束的缔合和解缔合作用使凝胶具有良好的重塑性能和自愈合性能。

A series of hydrophobic association hydrogels were synthesized via micellar copolymerization, using acrylamide（AM）, hydrophobic monomer （MM） and sodium dodecyl benzene sulfonate （SDBS） as reagents. The structure of the hydrogels were characterized by FT-IR, and the swelling ratio of hydrogels was measured. The results show that at room temperature, the swelling ratio of hydrophobic association hydrogels increases as the proportion of hydrophobic monomer （MM） increases, and the time of swelling equilibrium reduces. With temperature increasing, the time required for swelling decreases; with the increase of the concentration of SDBS, the gel swelling ratio reduces; in 1% NaCl aqueous solution, the maximum swelling ratio of gel greatly reduces; continue to increase the concentration of NaCl aqueous solution, the maximum swelling ratio has no obvious change. The hydrophobic association hydrogels perform good remolding properties and self healing properties because of association and disassociation of micelles which act as physical cross-linking dots.