Teixeira-Neto É, Leite CA, Cardoso AH, Braga M, Galembeck F
Instituto de Química, Universidade Estadual de Campinas-UNICAMP, Campinas, SP, CEP 13083-970, Brazil
J Colloid Interface Sci. 2000 Nov 1;231(1):182-189. doi: 10.1006/jcis.2000.7135.
Poly(styrene-co-acrylamide) (PS-AAM) latex was prepared, fractionated by sedimentation under gravity, and characterized by PCS, infrared spectra, secondary and backscattered electron imaging in the scanning electron microscope, and electron spectroscopy imaging in an analytical transmission electron microscope. Three latex fractions were obtained. The lower fraction was opalescent and its particles were the more uniform, concerning size, chemical composition, and topochemical features. This lower fraction was still further fractionated by zonal centrifugation in a density gradient, yielding two fractions with similar macrocrystal-forming abilities but different sizes and chemical compositions. These results confirm those previously obtained for the PS-HEMA latex. Copyright 2000 Academic Press.
制备了聚（苯乙烯 - 共 - 丙烯酰胺）（PS - AAM）胶乳，通过重力沉降进行分级，并通过光子相关光谱法（PCS）、红外光谱、扫描电子显微镜中的二次电子和背散射电子成像以及分析型透射电子显微镜中的电子能谱成像进行表征。获得了三个胶乳级分。较低级分呈乳光状，其颗粒在尺寸、化学成分和拓扑化学特征方面更为均匀。通过在密度梯度中进行区带离心对该较低级分进一步分级，得到两个具有相似大晶体形成能力但尺寸和化学成分不同的级分。这些结果证实了先前针对PS - HEMA胶乳所获得的结果。版权所有2000年学术出版社。
