Journal
POLYMER DEGRADATION AND STABILITY
Volume 93, Issue 8, Pages 1510-1514Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2008.05.012
Keywords
ultrasonic degradation; highly extended polymer; poly(gamma-benzyl-l-glutamate); multi-detector size-exclusion; chromatography; transient elongational flow
Categories
Funding
- ACS Petroleum Research Fund [1-1312-0050]
Ask authors/readers for more resources
Ultrasonic degradation provides a convenient means of studying the degradation of macromolecules in transient elongational flows. Of particular interest, because of their being a limiting architectural case, is the degradation of highly extended polymers. A classic example of a polymer with this type of architecture is poly(gamma-benzyl-L-glutamate) or PBLG. Here, we monitor results of the ultrasonic degradation of PBLG using size-exclusion chromatography with a multiplicity of physical detectors. Under the given experimental conditions, the limiting molar mass (M-lim) of PBLG was found to be approximately 114,000 g/mol. The fractal dimension of PBLG, which exemplifies the highly extended nature of the macromolecule, was measured by both light scattering and viscometric means. Results from both methods demonstrated a virtual invariance in chain conformation as a function of degradation. Additional support for these observations was provided by the dimensionless ratio of the viscometric and root-mean-square radii. (C) 2008 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available