The role of nanoparticle rigidity on the diffusion of linear polystyrene in a polymer nanocomposite

Miller, Brad; Imel, Adam E.; Holley, Wade; Baskaran, Durairaj; Mays, Jimmy W.; Dadmun, Mark D.

doi:10.1021/acs.macromol.5b01976

Title: The role of nanoparticle rigidity on the diffusion of linear polystyrene in a polymer nanocomposite

Journal Article · Thu Nov 12 00:00:00 EST 2015 · Macromolecules

DOI:https://doi.org/10.1021/acs.macromol.5b01976· OSTI ID:1265981

Miller, Brad ^[1]; Imel, Adam E. ^[1]; Holley, Wade ^[2]; Baskaran, Durairaj ^[1]; Mays, Jimmy W. ^[3]; Dadmun, Mark D. ^[3]

Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The impact of the inclusion of a nanoparticle in a polymer matrix on the dynamics of the polymer chains is an area of recent interest. In this article, we describe the role of nanoparticle rigidity or softness on the impact of the presence of that nanoparticle on the diffusive behavior of linear polymer chains. The neutron reflectivity results clearly show that the inclusion of 10 nm soft nanoparticles in a polymer matrix (R_g ~ 20 nm) increases the diffusion coefficient of the linear polymer chain. Surprisingly, thermal analysis shows that these nanocomposites exhibit an increase in their glass transition temperature, which is incommensurate with an increase in free volume. Therefore, it appears that this effect is more complex than a simple plasticizing effect. Results from small-angle neutron scattering of the nanoparticles in solution show a structure that consists of a gel like core with a corona of free chain ends and loops. Furthermore, the increase in linear polymer diffusion may be related to an increase in constraint release mechanisms in the reptation of the polymer chain, in a similar manner to that which has been reported for the diffusion of linear polymer chains in the presence of star polymers.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1265981

Journal Information:: Macromolecules, Vol. 48, Issue 22; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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