The alpha-relaxation in amorphous polymers seen by scattering methods: a synergistic NSE & XPCS approach
In this work, we aim to directly follow the dynamics of the a-relaxation in polymers in an unprecedented time/temperature range by using neutron spin-echo spectroscopy (NSE) at ILL in synergy with x-ray photon correlation spectroscopy, XPCS available at ESRF. While both techniques nowadays are able to measure the dynamic density correlation functions around the inter-chain structure factor peak located at relatively high scattering vectors (approx 0.5-1Å-1 ), they have an interesting complimentary dynamic window. Fast times in the picosecond (ps) – nanosecond (ns) range will be covered by NSE, and XPCS can cover times from milliseconds (ms)- hours. Hence, by combining the two complimentary techniques, we will be able to directly follow the generic structural al-relaxation towards the freezing at the glass transition (Tg) – a task so far not accomplished with scattering techniques. We believe that sufficient signal-to-noise ratios can be obtained by choosing deuterated as well as halogenated polymers that exhibit structure factor peaks at rather low Q and strong coherent scattering cross sections for both x-rays and neutrons. Combination with dielectric spectroscopy and computer
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LUND Reidar; Arantxa Arbe; COLMENERO Juan; FOUQUET Peter and MADSEN Anders. (2012). The alpha-relaxation in amorphous polymers seen by scattering methods: a synergistic NSE & XPCS approach. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-04-265
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