Applications of Successive Self-Nucleation and Annealing (SSA) to Polymer Characterization |
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Authors: | Arnal M L Balsamo V Ronca G Sánchez A Müller A J Cañizales E Urbina de Navarro C |
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Institution: | (1) Grupo de Polímeros USB, Departamento de Ciencia de los Materiales, Universidad Simón Bolívar, Apartado 89000, Caracas, 1080-A, Venezuela;(2) Departamento de Mecánica, Universidad Simón Bolívar, Apartado 89000, Caracas, 1080-A, Venezuela;(3) Centro de Microscopía Electrónica, Facultad de Ciencias, Universidad Central de Venezuela Caracas, Venezuela |
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Abstract: | A new technique to thermally fractionate polymers using DSC has been recently developed in our laboratory. The applications of the novel successive self-nucleation and annealing (SSA) technique to characterize polyolefins with very dissimilar molecular structures are presented as well as the optimum conditions to thermally fractionate any suitable polymer sample with SSA. For ethylene/ -olefin copolymers, the SSA technique can give information on the distribution of short chain branching and lamellar thickness. In the case of functionalized polyolefins, detailed examinations of SSA results can help to establish possible insertion sites of grafted molecules. The application of the technique to characterize crosslinked polyethylene and crystallizable blocks within ABC triblock copolymers is also presented.This revised version was published online in November 2005 with corrections to the Cover Date. |
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Keywords: | annealing DSC self-nucleation SSA thermal fractionation |
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