Fluctuation suppression in microgels by polymer electrolytes

Fluctuation suppression in microgels by polymer electrolytes
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聚合物电解质抑制微凝胶波动

DOI:
10.1063/4.0000014
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发表时间:
2020
期刊:
Structural Dynamics
影响因子:
--
通讯作者:
O. Holderer
O. Holderer
中科院分区:
--
文献类型:
--
作者:
S. Pasini;S. Maccarrone;N. Székely;L. Stingaciu;A. Gelissen;W. Richtering;M. Monkenbusch;O. Holderer

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用小角中子散射(SANS)和中子自旋回波(NSE)研究了温度响应型阳离子聚(N-异丙基丙烯酰胺-共甲基丙基三甲基氯化铵)微凝胶的结构细节以及阴离子电解质聚苯乙烯磺酸盐(PSS)对阳离子微凝胶内部结构和动力学的影响。虽然SANS可以提供有关粒子总体尺寸和粒子内部典型关联长度的信息,但使用NSE研究链段聚合物动力学可以获得更多内部细节,这些细节仅由于它们对聚合物运动的影响而出现。PSS添加剂在很大程度上抑制了微凝胶的链段动力学。讨论了聚阴离子对微凝胶结构和动力学影响的可能情景。
Structural details of thermoresponsive, cationically poly(N-iso-propylacrylamide-co-methacrylamido propyl trimethyl ammonium chloride) microgels and the influence of the anionic electrolyte polystyrene sulfonate (PSS) on the internal structure and dynamics of the cationic microgels have been studied with a combination of small angle neutron scattering (SANS) and neutron spin echo (NSE) spectroscopy. While SANS can yield information on the overall size of the particles and on the typical correlation length inside the particles, studying the segmental polymer dynamics with NSE gives access to more internal details, which only appear due to their effect on the polymer motion. The segmental dynamics of the microgels studied in this paper is to a large extent suppressed by the PSS additive. Possible scenarios of the influence of the polyanions on the microgel structure and dynamics are discussed.
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影响因子: 2.4
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