Authors:
M. Viciosa Universidade Nova de Lisboa REQUIMTE/CQFB, Departmento de Química, FCT 2829-516 Caparica Portugal

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J. Quiles Hoyo Universidad Politécnica de Valencia Center for Biomaterials Camino de Vera s/n 46071 Valencia Spain

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M. Dionísio Universidade Nova de Lisboa REQUIMTE/CQFB, Departmento de Química, FCT 2829-516 Caparica Portugal

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J. Gómez Ribelles Universidad Politécnica de Valencia Center for Biomaterials Camino de Vera s/n 46071 Valencia Spain

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Abstract  

Temperature modulated differential scanning calorimetry (TMDSC) is used to study the kinetics of the free radical isothermal polymerization of triethyleneglycol dimethacrylate (TEGDMA). Azo-bis-isobutironitrile was used as initiator. The polymerization’s temperature is lower than the final glass transition temperature of the polymer network. The measurement of the average heat flow released and the heat capacity during the reaction allows identifying the different stages of the reaction. The presence of double peaks in the heat flow is ascribed to the autoacceleration. The influence of temperature, measuring conditions and oxygen are described. Vitrification is detected by the drop in heat capacity. It occurs at increasing conversion rates for increasing temperatures. After vitrification, the diffusion-controlled reaction continues.

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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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