NDLI: Neutron scattering from equilibrium-swollen networks

Content Provider	Springer Nature Link
Author	Sukumaran, S. K. Beaucage, G. Mark, J. E. Viers, B.
Copyright Year	2005
Abstract	Small-angle neutron scattering measurements were performed on end-linked poly (dimethylsiloxane) (PDMS) networks swollen to equilibrium with d-benzene. Comparison was made with equivalent concentration PDMS solutions. Equilibrium-swollen networks consistently displayed a linear scattering regime at low q followed by a good-solvent-like scaling regime at high q in agreement with the predictions of the Gel Tensile Blob (GTB) model. Data are fit using the unified function modified for the GTB model (3-parameter fit). Equilibrium-swollen networks display a base structural size, the gel tensile-blob size, ξ, that was found to be independent of the molecular weight between crosslinks for the series of molecular weights studied, consistent with the predictions of the model. The length of the extended tensile structure, L, can be larger than the length of the fully extended network strand. The predicted scaling relationship for L, L ∼ Q1/2Navg, where Navg = (1/fNc2+1/4Ne2 $ \left.\vphantom{ {{{1} / {fN_{\rm c}^{2}} } + {{1} / {4N_{\rm e}^{2}} }} }\right)^{{ - 1 / 2}}_{}$ , Q is the equilibrium swelling ratio, Nc is the molecular weight between crosslinks, Ne is the entanglement molecular weight and f is the crosslink functionality is in agreement with experimental results for the networks studied.
Starting Page	29
Ending Page	36
Page Count	8
File Format	PDF
ISSN	12928941
Journal	The European Physical Journal E
Volume Number	18
Issue Number	1
e-ISSN	1292895X
Language	English
Publisher	Società Italiana di Fisica
Publisher Date	2005-09-23
Publisher Place	Bologna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Soft Matter, Complex Fluids Biotechnology Polymer Sciences Nonlinear Dynamics, Complex Systems, Chaos, Neural Networks Surfaces and Interfaces, Thin Films Biophysics/Biomedical Physics
Content Type	Text
Resource Type	Article
Subject	Chemistry Medicine Biophysics Materials Science Surfaces and Interfaces Biotechnology

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