caa a22 4500 60546698X CHVBK 20210128100309.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s00397-015-0872-9 doi (NATIONALLICENCE)springer-10.1007/s00397-015-0872-9 Modeling confinement in polymer nanocomposites from linear viscoelasticity data [Elektronische Daten] [Xun Chen, Margaret Sobkowicz] The ability of the time-dependent diffusion-double-reptation (TDD-DR) theory to predict the molecular structure and dynamics of polymer nanocomposites is investigated for poly(butylene succinate) blended with fumed silica particles with contrasting surface treatments (unmodified and modified with silanes). Structural and dynamic parameters such as confined polymer fraction (ϕ s) and relaxation time are extracted from fitting the experimental curves for relaxation modulus G(t) by the TDD-DR model with fluctuation effects included. A good fit of experimental data over seven time decades is obtained after modification of the TDD-DR model to account for Rouse relaxation on the short time scale. The fraction of confined polymer extracted from model fitting is in quantitative agreement with the value obtained from the specific reversing heat capacity for poly(butylene succinate) (PBS)/fumed silica nanocomposites. Based on parameters deduced from rheological data, we study the influence of surface functionality on the microstructure of polymer matrix. We conclude that increasing the polymer-particle compatibility through introduction of a hydrophobic functionality on the surface of the particles results in increased amount of confined PBS chains and strong immobilization of the PBS molecules. These interface effects are discussed for the first time in terms of TDD-DR model that takes into account the dynamics of bound polymer chains, allowing prediction of the universal nature of the confinement effect and its role in polymer nanocomposite processing and bulk physical properties. Springer-Verlag Berlin Heidelberg, 2015 Reptation nationallicence Linear viscoelasticity nationallicence Stress relaxation nationallicence Chen Xun Plastics Engineering Department, University of Massachusetts Lowell, One University Avenue, 01854, Lowell, MA, USA aut Sobkowicz Margaret Plastics Engineering Department, University of Massachusetts Lowell, One University Avenue, 01854, Lowell, MA, USA aut Rheologica Acta Springer Berlin Heidelberg 54/9-10(2015-10-01), 847-857 0035-4511 54:9-10<847 2015 54 397 https://doi.org/10.1007/s00397-015-0872-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00397-015-0872-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chen Xun Plastics Engineering Department, University of Massachusetts Lowell, One University Avenue, 01854, Lowell, MA, USA aut NATIONALLICENCE 700 1- Sobkowicz Margaret Plastics Engineering Department, University of Massachusetts Lowell, One University Avenue, 01854, Lowell, MA, USA aut NATIONALLICENCE 773 0- Rheologica Acta Springer Berlin Heidelberg 54/9-10(2015-10-01), 847-857 0035-4511 54:9-10<847 2015 54 397