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The exfoliation mechanism and thermal–mechanical properties of surface-initiated epoxy nanocomposites were studied. Time-resolved high-temperature X-ray diffraction, DSC, and isothermal rheological analyses revealed that the interlayer expansion mechanism might be separated into three stages. These stages relate to the initial interlayer expansion, the steady-state interlayer expansion, and the cessation...
In recent years, several research groups have created reworkable thermoset systems. A prominent use of such materials is in microelectronics packaging areas to enable the repair or reprocessing of electronic components. A wider implication of such an application is that it may facilitate the future recycling or reuse of older computer systems. Recent studies indicate millions of computers are discarded...
A new family of random copolymers composed of chloromethylstyrene and a silicon based styrenic monomer was prepared using living radical polymerization. The lithographic efficiency of the resulting electron beam resists was examined. A pronounced improvement on the lithographic resolution and image quality of resists with a narrow molecular mass distribution was observed and is described.
Relaxation of disclination loops created during shear flow of a low molar mass and a polymer liquid crystal were monitored using a special shear stage with a videomicroscope. Loops in the polymer system generally displayed initially highly distorted contours. In the small molecule liquid crystal, the loop contours consistently exhibited very simple, generally convex shapes. In the polymer system,...
Smectic network formation using a twin liquid crystalline epoxy monomer (4-(oxiranylmethoxy)benzoic acid 1,8-octanediylbis(oxy-4,1-phenylene) ester) cross-linked with sulfanilamide was examined in real time by polarizing optical microscopy, X-ray diffraction, dynamic viscometry and differential scanning calorimetry. The initial curing reaction of the twin epoxy monomer and sulfanilamide was found...
Abstract We have studied the oscillatory shear response of three thermotropic smectic-A liquid crystalline materials with no external aligning field (other than the necessary presence of rheometer plates). Two are polymers (one main-chain and one side-chain) and the other is a small molecule smectic. All three exhibit the classical linear response to oscillatory shear characteristic of a viscoelastic...
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