Pasini S, Maccarrone S, Székely N K, Stingaciu L R, Gelissen A P H, Richtering W, Monkenbusch M, Holderer O
Forschungszentrum Jülich GmbH, JCNS at Heinz Maier-Leibnitz Zentrum, Lichtenbergstraße 1, 85747 Garching, Germany.
NScD, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
Struct Dyn. 2020 Jun 15;7(3):034302. doi: 10.1063/4.0000014. eCollection 2020 May.
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.
采用小角中子散射（SANS）和中子自旋回波（NSE）光谱相结合的方法，研究了热响应性阳离子聚（N-异丙基丙烯酰胺-共-甲基丙烯酰胺丙基三甲基氯化铵）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可以提供有关颗粒总体尺寸和颗粒内部典型相关长度的信息，但用NSE研究聚合物链段动力学可以获得更多内部细节，这些细节仅因其对聚合物运动的影响而出现。本文研究的微凝胶的链段动力学在很大程度上受到PSS添加剂的抑制。讨论了聚阴离子对微凝胶结构和动力学影响的可能情况。
