Positron Annihilation and Chemistry of Groups in Hyperbranched Polymers

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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.

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Periodical:

Edited by:

S. J. Wang, Z. Q. Chen, B. Wang and Y. C. Jean

Pages:

85-87

DOI:

10.4028/www.scientific.net/MSF.607.85

Citation:

W. Gong et al., "Positron Annihilation and Chemistry of Groups in Hyperbranched Polymers", Materials Science Forum, Vol. 607, pp. 85-87, 2009

Online since:

November 2008

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$35.00

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