The effect of physical aging on the properties of atactic polystyrene
Song, R; Chen, J; Gao, JG; Lin, X; Fan, QR
AbstractEffects of physical aging on the structure, mechanical and other properties of atactic polystyrene (a-PS) films and fibers are studied by modulated differential scanning calorimetry (MDSC), density, solvent diffusing rate, stress-strain behavior and sonic velocity measurements, and the corresponding observations are tentatively explained from the viewpoint of cohesional entanglements. It is shown that the glass transition temperature (T-g), relaxation enthalpy (Delta H) and its peak value (T-max) in the MDSC curves, as well as the initial modulus (E), yield strength (sigma(y)) and strength at break (sigma(b)) all rise with the increase of physical aging time. On the other hand, the solvent diffusing rate slows down after being annealed below its T-g, while the sonic velocity and density nearly keep unchanged. The weak interaction (i.e. cohesional entanglements) introduced by the physical aging is similar to van der Waals' force from its physical characteristic. All experimental results are interpreted by the assumption that the number of cohesional entanglements increase during physical aging.
KeywordAtactic Polystyrene Physical Aging Modulated Differential Scanning Calorimetry Relaxation Enthalpy
Indexed BySCI
WOS IDWOS:000076400000011
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorSong, R
AffiliationChinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Song, R,Chen, J,Gao, JG,et al. The effect of physical aging on the properties of atactic polystyrene[J]. ACTA POLYMERICA SINICA,1998(1):61-66.
APA Song, R,Chen, J,Gao, JG,Lin, X,&Fan, QR.(1998).The effect of physical aging on the properties of atactic polystyrene.ACTA POLYMERICA SINICA(1),61-66.
MLA Song, R,et al."The effect of physical aging on the properties of atactic polystyrene".ACTA POLYMERICA SINICA .1(1998):61-66.
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