All samples were ultramicrotomed with a diamondknife on a Leica Ultracut UCT microtome (Bannockburn,IL) at either room temperature (cyanate estersand PS) or at 110°C (PPgMA and PA-6) to givesections with a nominal thickness of 70 nm. The sectionswere transferred from water (room temperature)or dry conditions (110°C) to carbon-coated 200-meshCu grids. Bright-field TEM images of PLSNs (exceptfor PA-6) were obtained at 120 kV, under low-doseconditions, with a Philips 400T electron microscopeand with Kodak SO-161 film. Low-magnification imageswere taken at 2,800 and 10,000. High-magnifi-cation images were taken at 28,000 and 60,000.Bright-field TEM images of PA-6 nanocompositeswere obtained at 120 kV, under low-dose conditions,with a Philips CM-12 electron microscope, and weredigitally imaged with a charge coupled device (CCD)camera
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