Abstract
Rayleigh–Brillouin light scattering studies have been peformed on samples of pure atactic polystyrene which has been subjected to a densification cycle. On reheating the densified glass isobarically at low pressure a significant increase is observed in the Rayleigh intensity in temperature regions associated with motion of the phenyl side groups below Tg ( β relaxation) and with rearrangement of the chain backbone above Tg (α relaxation). This enhanced scattering intensity is attributed to nonuniform density distributions created in the sample as the long chain molecules return to configurations appropriate to the nondensified glass and the equilibrium melt. There is only a slight difference in the values of the hypersonic velocity between the densified and nondensified glasses and no difference in the equilibrium melt.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
