A scattering function of star polymers including excluded volume effects

Journal Article · Tue Nov 04 00:00:00 EST 2014 · Journal of Applied Crystallography (Online)

DOI:https://doi.org/10.1107/S1600576714022249· OSTI ID:1185496

Li, Xin ^[1]; Do, Changwoo ^[2]; Liu, Yun ^[3]; Sánchez-Diáz, Luis ^[1]; Smith, Gregory ^[1]; Chen, Wei-Ren ^[1]

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1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Delaware, Newark, DE (United States)
3. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research

In this work we present a new model for the form factor of a star polymer consisting of self-avoiding branches. This new model incorporates excluded volume effects and is derived from the two point correlation function for a star polymer.. We compare this model to small angle neutron scattering (SANS) measurements from polystyrene (PS) stars immersed in a good solvent, tetrahydrofuran (THF). It is shown that this model provides a good description of the scattering signature originating from the excluded volume effect and it explicitly elucidates the connection between the global conformation of a star polymer and the local stiffness of its constituent branch.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1185496
• Journal Information: Journal of Applied Crystallography (Online), Vol. 47, Issue 6; ISSN 1600-5767
• Publisher: International Union of Crystallography
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
star polymers
scattering functions
excluded volume effects