聚皂凝胶对直流电场作用的响应

Stimuli Response of Polysoap Hydrogels under Electric Fields

研究了三种聚皂凝胶在直流电场下的响应．这三种凝胶在直接接触电场下，在阳极端发生消溶涨，而在非直接接触电场下形状发生显著的弯曲这些响应均随电场电压的升高而增强．聚皂凝胶在电场下产生响应的驱动力，除了因离子迁移产生的渗透压差外，疏水相互作用也是驱动力之一.

The difference of polysoap hydrogels and normal polyelectrolyte hydrogels is that the former possess hydrophobic side chains. Poly(diallylamie-N N-dodecylmethyldiallylammonium br-omide ) (PDA-C12 ), Poly (N-methyldiallylamine-N, N-dodecylmethyldiallylammonium bromide )(PMDA-C12) and stearic acid modified poly (tetraethylenepentamine-epichlorohydrin) (PTE- C18)contain hydrophobic side chains with 12 carbon and 18 carbon, respectively. The stimuli-response of the gels under electric fields was investigated. Under contact electric fields, the deswelling was observed in the anode side of the gels. Under non-contact electric fields, the gels bend toward the anode.The gels can turn back original sharps and bent toward the cathode with time when higher voltage was applied. These properties of the gels are related to both the change of osmotic pressure caused by mobile ions and hydrophobic interaction.