Year-end Sale % OFF 
Abstract
Atactic polystyrene was dissolved and refluxed in benzene keeping the polymer concentration well below the critical concentration C* value for chain overlap. After rapid freezing of the solution by injecting it directly into liquid nitrogen, the solvent was sublimated so that the expanded chain coils with few entanglements could be obtained. Tg for this material was found to be 11 K lower than the normal polystyrene even after annealing up to 470 K. Comparison of the infrared spectra shows some conformational differences between the freeze-dried and the normal PS. Upon shock-cooling and subsequent freeze-drying, all vibrational bands appear much sharper, indicating an increase in structure regularity.
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.
