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2910759 
Journal Article 
Dynamic mechanical relaxation in the opaque and transparent poly(4-methyl-1-pentene) films - The glass transition zone 
Danch, A 
1998 
1 
Journal of Thermal Analysis and Calorimetry
ISSN: 1388-6150
EISSN: 1588-2926 
54 
1 
151-159 
English 
WOS:000077838300018 
The thermomechanical properties of opaque and transparent polymer films of a solution of poly(4-methyl-1-pentene) (PMP) in cyclohexane and carbon tetrachloride obtained by casting on teflon and glass plates were investigated. The dynamic mechanical thermal analysis was applied in a frequency range from 0.01 to 100 Hz. The curves of loss tangent vs. temperature varied depending on the sample thermal history. The first part of these curves could relate to the backbone α relaxation into the unperturbed amorphous phase while the next relaxation could result from the backbone α relaxation into amorphous phase perturbed by the presence of the crystal domains. The Arrhenius plots of the first relaxation show a stronger curvature found in each of the transparent samples indicating strong dependency on specific volume. The second one in the case of transparent films and the first one for opaque samples might be approximate to straight lines. 
alpha relaxations; glass transition; PMP