Soutar I, Swanson L, Annable T, Padget J C, Satgurunathan R
Polymer Centre, School of Physics and Chemistry, Lancaster University, Lancaster LA1 4YA, UK.
Langmuir. 2006 Jun 20;22(13):5904-10. doi: 10.1021/la060376b.
Fluorescence techniques (including time-resolved anisotropy measurements, TRAMS) have been used to probe differences in morphology between two stabilized aqueous latex dispersions (poly(n-butyl methacrylate), PBMA, and polyurethane, PU). Use of the emission characteristics of probes such as pyrene and phenanthrene dispersed within particles reveals that the PU latices are more heterogeneous in nature: evidence exists, particularly from quenching measurements and TRAMS, that voids and channels of water permeate the PU structure, resulting in a relatively soft, open particle, swollen by ingress of the bulk aqueous phase. Fluorescence measurements indicate that PBMA colloids, however, are composed of relatively hard, hydrophobic particles. In addition, TRAMS are considered to be a valuable tool both for probing the morphological characteristics of such dispersions and in estimating the average particle size.
荧光技术（包括时间分辨各向异性测量，TRAMS）已被用于探究两种稳定的水性乳胶分散体（聚甲基丙烯酸正丁酯，PBMA，和聚氨酯，PU）之间的形态差异。使用分散在颗粒内的芘和菲等探针的发射特性表明，PU乳胶本质上更不均匀：有证据表明，特别是从猝灭测量和TRAMS来看，水的空隙和通道渗透到PU结构中，导致颗粒相对柔软、开放，因本体水相的进入而膨胀。然而，荧光测量表明，PBMA胶体由相对坚硬、疏水的颗粒组成。此外，TRAMS被认为是探测此类分散体形态特征和估计平均粒径的有价值工具。
