Geopolymers
Inorganic polymeric new materials
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Blanca Rojas de Gáscue
Blanca Rojas de Gáscue
Instituto de Investigaciones en Biomedicina y Ciencias Aplicadas, IIBCA-UDO, Universidad de Oriente, Cerro del Medio, Núcleo de Sucre, Cumaná, Edo. Sucre, Venezuela
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José Luis Prin
José Luis Prin
Instituto de Investigaciones en Biomedicina y Ciencias Aplicadas, IIBCA-UDO, Universidad de Oriente, Cerro del Medio, Núcleo de Sucre, Cumaná, Edo. Sucre, Venezuela
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Gilma Hernández
Gilma Hernández
Instituto de Investigaciones en Biomedicina y Ciencias Aplicadas, IIBCA-UDO, Universidad de Oriente, Cerro del Medio, Núcleo de Sucre, Cumaná, Edo. Sucre, Venezuela
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Enrique M. Vallés
Enrique M. Vallés
Planta Piloto de Ingeniería Química, PLAPIQUI (UNS-CONICET), Camino La Carrindanga Km 7 - (8000), Bahía Blanca, Argentina
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Arnaldo T. Lorenzo
Arnaldo T. Lorenzo
Grupo de Polímeros USB, Departamento de Ciencia de los Materiales, Universidad Simón Bolívar, Apdo. 89000, Caracas 1080-A, Venezuela
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Alejandro J. Müller
Alejandro J. Müller
Grupo de Polímeros USB, Departamento de Ciencia de los Materiales, Universidad Simón Bolívar, Apdo. 89000, Caracas 1080-A, Venezuela
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Abstract
The application of the Successive Self-nucleation and Annealing (SSA) thermal fractionation technique can yield detailed information of the structural changes induced in linear polyethylene by irradiation. The production of tertiary carbons during the crosslinking reactions can be equivalent to the structural heterogeneity present in branched polyethylenes since in both cases interruption of the linear crystallizable sequences occurs, and these are structural differences that can be easily detected by thermal fractionation. We demonstrate how correlations between melting point and short chain branching content employed for branched polymers can be useful to characterize the distribution of chain heterogeneity produced by crosslinking. As the radiation dose is increased and the crosslinking content also increases, the distribution of chain heterogeneity gets broader as detected by SSA. When the results are coupled with morphological observations made by transmission electron microscopy, valuable information on the morphological changes produced by crosslinking can also be ascertained, since the distribution of lamellar thicknesses substantially broadens with crosslinking. Such a broad distribution can also be predicted from SSA by simple calculations performed employing a modified version of the Gibbs–Thomson equation and is expected on the basis of random crosslinking reactions.
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| Journal of Thermal Analysis and Calorimetry | |
|---|---|
| Language | English |
| Size | A4 |
| Year of Foundation |
1969 |
| Volumes per Year |
1 |
| Issues per Year |
24 |
| Founder | Akadémiai Kiadó |
| Founder's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. |
| Publisher | Akadémiai Kiadó Springer Nature Switzerland AG |
| Publisher's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11. |
| Responsible Publisher |
Chief Executive Officer, Akadémiai Kiadó |
| ISSN | 1388-6150 (Print) |
| ISSN | 1588-2926 (Online) |
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Temperature dependence of the rate of reaction in thermal analysis
The Arrhenius equation in condensed phase kinetics
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