Norman Alexander I, Ho Derek L, Karim Alamgir, Amis Eric J
Polymers Division, Stop 8542, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899-8542, USA.
J Colloid Interface Sci. 2005 Aug 1;288(1):155-65. doi: 10.1016/j.jcis.2005.02.091.
We present a small angle neutron scattering (SANS) study into the micellar structures of diblock copolymer E18B9 (where E denotes a ethylene oxide unit and B denotes a butylene oxide unit, 18 and 9 being the number of repeat units respectively) in aqueous solution over a range of five different concentrations (0.2, 1.0, 10.0, 20.0, and 40.0% (by mass fraction)) and eight temperatures (10 to 90 degrees C). The NG7 30 m SANS instrument provides a q range of 0.0009 to 0.5548 A(-1), thus probing the structure over a very broad length scale. At low temperature and low concentration, spherical micelles exist, elongating into worm-like structures at higher temperatures. This transition is observed by the scaling of the scattered intensity at low q and confirmed upon fitting to an appropriate model. Upon increasing concentration, the micelles pack into ordered arrays of either hexagonally packed rod-like micelles or lamellar sheets, again dependent on temperature. Both concentration and temperature effects of this block copolymer have been discussed.
我们展示了一项小角中子散射（SANS）研究，该研究针对二嵌段共聚物E18B9（其中E表示环氧乙烷单元，B表示环氧丁烷单元，18和9分别为重复单元的数量）在水溶液中的胶束结构，研究范围涵盖五种不同浓度（0.2%、1.0%、10.0%、20.0%和40.0%（质量分数））以及八个温度（10至90摄氏度）。NG7 30米SANS仪器提供的q范围为0.0009至0.5548 Å⁻¹，从而在非常宽的长度尺度上探测结构。在低温和低浓度下，存在球形胶束，在较高温度下会伸长为蠕虫状结构。通过低q处散射强度的标度观察到这种转变，并在拟合到适当模型时得到证实。随着浓度增加，胶束堆积成六方堆积的棒状胶束或层状片的有序阵列，同样取决于温度。讨论了该嵌段共聚物的浓度和温度效应。
