A Small-Angle Neutron Scattering Study of the Equilibrium Conformation of Polyelectrolytes in Stoichiometric Saloplastic Polyelectrolyte Complexes
A Small-Angle Neutron Scattering Study of the Equilibrium Conformation of Polyelectrolytes in Stoichiometric Saloplastic Polyelectrolyte Complexes
复制标题
化学计量盐塑性聚电解质复合物中聚电解质平衡构象的小角中子散射研究
DOI：
10.1021/ma2022666
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发表时间：
2012
期刊：
影响因子：
5.5
通讯作者：
J. Schlenoff
中科院分区：
文献类型：
--
作者：
M. Markarian;Haifa H. Hariri;Andreas Reisch;V. Urban;J. Schlenoff
以全磺化聚苯乙烯磺酸盐（PSS）为聚阴离子，聚二烯丙基二甲基氯化铵（PDADMA）为聚阳离子，在优化的NaCl和NaCl2浓度下混合，制备了化学计量比的聚苯乙烯磺酸盐（PEC）。复合物通过超离心压实，然后在升高的温度下在NaCl溶液中退火，以使聚合物充分混合和松弛。采用对比度匹配的小角中子散射（SANS）研究了由氘代和质子化PSS链混合物制成的佩奇中的单链尺寸。两个PSS分子量的PEC进行了研究，在各种离子强度。SANS曲线，形状因子拟合，和相应的Kratky图表明，高斯性质的复合物中的双链的分子量无关。PSS线圈略大于未扰动的尺寸，对于更高分子量的材料更是如此，这归因于有效的刚性。
Stoichiometric polyelectrolyte complexes, PECs, from fully sulfonated poly(styrenesulfonate), PSS, as polyanion and poly(diallyldimethylammonium chloride), PDADMA, as polycation, were prepared by mixing them at optimized polyelectrolyte and NaCl concentrations. The complexes were compacted by ultracentrifugtion and then annealed in NaCl solutions at elevated temperatures to allow the polymers to fully intermix and relax. Small-angle neutron scattering, SANS, with contrast matching, was used to study single polyelectrolyte chain dimensions in PECs made from a mixture of deuterated and protonated PSS chains. Two PSS molecular weights in PECs were investigated at various ionic strengths. SANS curves, form factor fits, and corresponding Kratky plots indicate the Gaussian nature of the polyelectrolyte chains in the complexes regardless of molecular weight. PSS coils were slightly larger than the unperturbed dimension, more so for the higher molecular weight material, which was attributed to an effective stiffe...