Authors:
R. P. Kusy Dental Research Center University of North Carolina 27514 Chapel Hill N.C. USA

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A. R. Greenberg Dental Research Center University of North Carolina 27514 Chapel Hill N.C. USA

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Using a new parallel beam apparatus, the dynamic mechanical properties of poly-(methyl methacrylate) were determined over a wide range of molecular weights (1500< < <600 000). Results showed that the modulus (25 °C) was only slightly dependent on chain length, and equalled 2.3×109 Pa for the highest molecular weight scanned. Simultaneous acquisition ofα- andβ-relaxations indicated a decrease inTα in accordance with Gibbs' relation, whileTβ was invariant. BothTα=111° andTβ=40° corroborated previous results from several sources, including dynamic mechanical measurements. Such modulus and glass transition data are essential to the calculation of fracture toughness and to the assessment of radiation damage of acrylic, respectively.

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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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