Jouault Nicolas, Crawford Michael K, Chi Changzai, Smalley Robert J, Wood Barbara, Jestin Jacques, Melnichenko Yuri B, He Lilin, Guise William E, Kumar Sanat K
Sorbonne Universités, UPMC Univ Paris 06, CNRS, Laboratoire PHENIX, Case 51, 4 place Jussieu, F-75005 Paris, France.
Department of Chemical Engineering, Columbia University, New York, New York 10027, United States.
ACS Macro Lett. 2016 Apr 19;5(4):523-527. doi: 10.1021/acsmacrolett.6b00164. Epub 2016 Apr 7.
Chain behavior has been determined in polymer nanocomposites (PNCs) comprised of well-dispersed 12 nm diameter silica nanoparticles (NPs) in poly(methyl methacrylate) (PMMA) matrices by Small-Angle Neutron Scattering (SANS) measurements under the Zero Average Contrast (ZAC) condition. In particular, we directly characterize the bound polymer layer surrounding the NPs, revealing the bound layer profile. The SANS spectra in the high- region also show no significant change in the bulk polymer radius of gyration on the addition of the NPs. We thus suggest that the bulk polymer conformation in PNCs should generally be determined using the high region of SANS data.
通过在零平均对比度（ZAC）条件下的小角中子散射（SANS）测量，已确定由直径为12纳米且分散良好的二氧化硅纳米颗粒（NPs）与聚甲基丙烯酸甲酯（PMMA）基质组成的聚合物纳米复合材料（PNCs）中的链行为。特别地，我们直接表征了围绕纳米颗粒的束缚聚合物层，揭示了束缚层轮廓。在高q区域的SANS光谱也表明，添加纳米颗粒后本体聚合物的回转半径没有显著变化。因此，我们建议通常应使用SANS数据的高q区域来确定PNCs中本体聚合物的构象。
