Positron Annihilation and Chemistry of Groups in Hyperbranched Polymers

Abstract:

In this paper, both lifetime and intensity in hyperbranched polymers were measured by using positron annihilation lifetime spectroscopy (PALS) measurements. Ortho-positronium properties upon the degree of branching (DB) have been studied; o-Ps lifetimes maintain a constant while an increase in o-Ps intensities has been detected with DB increasing. Which is inconsistent with author’s prediction and indicate that interactions between positronium and the free-volumes are strongly depend on not only the free-volume size properties but also its chemistry environment, due to the variations in the distribution of the different ending groups: –OH and -CH3, caused by DB changes in hyperbranched polymers. The present works demonstrate that in the polar-polymeric application of PALS, effects of the distribution of polar groups should be properly taken into consideration.

• Periodical: Materials Science Forum (Volume 607)
• Pages: 85-87
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.607.85
• Online since: November 2008
• Authors: Wei Gong, Yi Yong Mai, Yong Feng Zhou, Ning Qi, Bo Wang, De Yue Yan
• Keywords: Degree of Branching, Free Volume, Hyperbranched, Positron Annihilation

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