NDLI: Microscopic dynamics in nanocomposites of poly(ethylene oxide) and poly(methyl methacrylate) soft nanoparticles: A quasi-elastic neutron scattering study

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Microscopic dynamics in nanocomposites of poly(ethylene oxide) and poly(methyl methacrylate) soft nanoparticles: A quasi-elastic neutron scattering study

Content Provider	Semantic Scholar
Author	Bhowmik, Debsindhu Pomposo, José A. Jurányi, Fanni García-Sakai, Victoria Zamponi, Michaela M. Su, Yixi Arbe, Arantxa Colmenero, Juan
Copyright Year	2014
Abstract	We have selectively studied the component dynamics in a nanocomposite where 25 wt % of PMMA [poly(methyl methacrylate)] soft nanoparticles (SNPs) are dispersed in PEO [poly(ethylene oxide)] by means of quasi-elastic neutron scattering (QENS) experiments on partially deuterated samples. We have covered a time range from subpico to nanosecond regime and a momentum transfer range 0.5 ≤ Q ≤ 1.8 A–1 by combining three different spectrometers. Complementary diffraction measurements with polarization analysis have facilitated the data analysis, by providing the coherent and incoherent contributions to the scattered intensities. Regarding the SNPs, the α-methyl group dynamics of PMMA—to which the QENS experiments are most sensitive in the temperature range investigated—turn to be faster than in bulk PMMA. This could be due to the plasticization effect induced by the fast PEO chains. In fact, calorimetric measurements show the coexistence of two glass-transition temperatures in the system, associated with each of ...
Starting Page	304
Ending Page	315
Page Count	12
File Format	PDF HTM / HTML
DOI	10.1021/ma402023n
Volume Number	47
Alternate Webpage(s)	http://digital.csic.es/bitstream/10261/102694/4/Microscopic%20dynamics.pdf
Alternate Webpage(s)	https://doi.org/10.1021/ma402023n
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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