Positron annihilation study in inorganic-polymer nano-composites

H. M. Chen, Y. C. Jean, L. James Lee, Jintao Yang, James Huang

研究成果: Conference article同行評審

17 引文 斯高帕斯(Scopus)

摘要

Positron annihilation lifetime experiments in a series of polystyrene (PS) nano-composites of different wt% of SiO2 as a function of temperature have been performed and the glass transition temperatures are determined. Previously, in PS/CNF(carbon nanofiber), a system with strong interfacial bonding, we found single glass transition temperature (Tg), which increases with wt % of CNF. Currently, in PS/SiO2 nano-composites, a weak interfacial interaction system, we found that there are two Tgs, one at 57 °C, which is lower than the PS bulk Tg (= 91 °C). The lower Tg is interpreted from the free volume in the weak bonding interface between PS and SiO2. This result is consistent with our previous slow positron beam results of PS on Si substrate, which shows a significant lower Tg in the interface than in the bulk PS.

原文English
頁(從 - 到)2397-2400
頁數4
期刊Physica Status Solidi (C) Current Topics in Solid State Physics
6
發行號11
DOIs
出版狀態Published - 2009
事件15th International Conference on Positron Annihilation, ICPA-15 - Kolkata, India
持續時間: 18 1月 200923 1月 2009

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