Hariri Haifa H, Schlenoff Joseph B
Department of Chemistry and Biochemistry The Florida State University Tallahassee, Florida 32306.
Macromolecules. 2010 Oct 26;43(20):8656-8663. doi: 10.1021/ma1012978.
Complexes of sodium poly(4-styrenesulfonate) (NaPSS) and poly(diallyldimethylammonium chloride) (PDADMAC) were formed on mixing equimolar solutions in high salt concentration. Under ultracentrifugal fields, the complex precipitates were transformed into compact polyelectrolyte complexes (CoPECs), which showed extensive porosity. The mechanical properties of CoPECS make them attractive for bioimplants and tissue engineering applications. Free NaPSS chains in the closed pores of CoPECs create excess osmotic pressure, which controls the pore size and contributes to the mechanical resistance of the material. The mechanical properties of CoPECs, modulated by the ionic strength of the doping medium, were studied by uniaxial tensile testing and the stress-strain data were fit to a three-element Maxwell model which revealed at least two regimes of stress relaxation.
在高盐浓度下将等摩尔溶液混合时，形成了聚（4-苯乙烯磺酸钠）（NaPSS）和聚（二烯丙基二甲基氯化铵）（PDADMAC）的复合物。在超速离心场下，复合沉淀物转变为致密的聚电解质复合物（CoPEC），其具有广泛的孔隙率。CoPEC的机械性能使其在生物植入物和组织工程应用中具有吸引力。CoPEC封闭孔中的游离NaPSS链产生额外的渗透压，该渗透压控制孔径并有助于材料的机械抗性。通过单轴拉伸试验研究了由掺杂介质的离子强度调节的CoPEC的机械性能，并将应力-应变数据拟合到三元麦克斯韦模型，该模型揭示了至少两种应力松弛状态。
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