Measuring the glass transition temperature of EPDM roofing materials: Comparison of DMA, TMA, and DSC techniques
- National Research Council of Canada, Ottawa, Ontario (Canada). Inst. for Research in Construction
Two ethylene-propylene-diene monomer (EPDM) roofing membranes were aged at 100 C for 7 and 28 days. The T{sub g} of these membranes was then determined by dynamic mechanical analysis (DMA), thermomechanical analysis (TMA), and differential scanning calorimetry (DSC) and the results compared. It was found that: (1) T{sub g} data can be obtained easily using the DMA and TMA techniques. The DSC method requires greater care due to the broad step change in the baseline which is associated with heavily plasticized materials. (2) The closest correspondence between techniques was for TMA and DSC (half-height). The latter, within experimental error, yielded the same glass transition temperature before and after heat-aging. (3) The peak maxima associated with tan{delta} and E{double_prime} measurements should be cited with T{sub g} values as significant differences can exist. (4) The T{sub g}(E{double_prime}) values were closer to the T{sub g}(TMA) and T{sub g}(DSC) data than were the T{sub g}(tan{delta}) values. Data obtained at 1 Hz (or possibly less) should be used when making comparisons based on various techniques. An assessment of T{sub g} values indicated that EPDM 112 roofing membrane is more stable than the EPDM 111 membrane. The T{sub g} for EPDM 112 did not change significantly with heat-aging for 28 days at 130 C.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 136476
- Report Number(s):
- CONF-930398-; ISSN 0066-0558; TRN: IM9552%%18
- Journal Information:
- American Society for Testing and Materials, Special Technical Publication, Journal Issue: 1249; Conference: American Society of Testing and Materials (ASTM) meeting on glass transition, Atlanta, GA (United States), 4-5 Mar 1993; Other Information: PBD: Sep 1994
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ETHYLENE PROPYLENE DIENE POLYMERS
TRANSITION TEMPERATURE
ROOFS
BUILDING MATERIALS
PLASTICIZERS
MECHANICAL TESTS
THERMAL CYCLING
CALORIMETRY
THERMAL ANALYSIS
ELASTOMERS
RHEOLOGY
FREQUENCY DEPENDENCE
THERMAL EXPANSION
AGING
EXPERIMENTAL DATA