Measurement of the first internal mode of polystyrene in cyclohexane and toluene through dynamic light scattering

A study of the longest internal relaxation time {dollar}\tau\sb1{dollar} of 8.42 {dollar}\times{dollar} 10{dollar}\sp6{dollar} M{dollar}\sb{\rm w}{dollar} macromolecular polystyrene dissolved in both toluene and cyclohexane was done through the use of photon correlation spectroscopy from scattered laser light. The data obtained (autocorrelation functions) were then analyzed by means of a multi-exponential fitting programme (Discrete) on the Cyber 830 computer and by a non-linear least squares program (NLLSQ) on an Apple IIe computer. The exponential decay constants derived from these fits were further used to obtain a value of {dollar}\tau\sb1{dollar} in each solvent and also to find the power relation between these decay constants and q, the magnitude of the scattering wave vector. The relaxation time {dollar}\tau\sb1{dollar}, together with the q dependence of the decay constant, was then compared to the predicted results from the Rouse-Zimm bead-and-spring model of polymers as well as other models and other researchers' published results. (Abstract shortened with permission of author.).

Name thesis:degree_name

Master of Science (MS)

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Physics

Grantor dc:publisher

University of Nevada, Las Vegas

Year

1988

Author dc:creator

• Ellis, Albert Raymond

Contributors dc:contributor

• James C. Selser

Statement dc:rights

• IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/

Language dc:language

English

Identifier

https://oasis.library.unlv.edu/rtds/50

OAI identifier oai:identifier

oai:oasis.library.unlv.edu:rtds-1049