Polymers neutron scattering

Keywords Dynamic heterogeneity Inelastic and quasielastic neutron scattering Polymer thin film... 

Yurekli, K., and R. Krishnamoorti. 2004. Thermodynamic interactions in blends of poly(4-tert-butyl styrene) and polyisoprene by small-angle neutron scattering. /. Polym. Set. Part B Polym. Phys. 42 3204-3217. 

Wignall, G.D., Child, H.R. and Samuels, RJ. (1982) Structural characterization of semicrystalline polymer blends by small-angle neutron scattering. Polymer, 23, 957-964. 

Sirota E, Herhold A (1999) Transient phase-induced nucleation. Science 283(5401 ) 529-532 Spells SJ, Sadler DM, Keller A (1980) Chain trajectory in solution grown polyethylene crystals correlation between infra-red spectroscopy and small-angle neutron scattering. Polymer 21 (10) 1121-1128... 

KA Okano, K., Takada, M., Kurita, K., and Fumsaka, M., Interaction parameters of poly(vinyl methyl ether) in aqueous solution determined by small-angle neutron scattering. Polymer, 35, 2284, 1994. 

Selb J, Marie P, Rameau A, Duplessix R, Gallot Y (1983) Study of the structure of block copolymer-homopolymer blends using small angle neutron scattering. Polym Bull 10 444-451... 

Characterization of Poiymer Biends and Biock Copoiymers by Neutron Scattering Polymer Blend... 

Harrak, A. E. Carrot, G. Oberdisse, J. Jestin, J. Bou, F. (2005). Atom Transfer Radical Polymerization from Silica Nanoparticles using Grafting from Method and Structural Study via Small Angle Neutron Scattering. Polymer, 46, 1095-1104... 

Sadler DM, KeUer A. Trajectory of polyethylene chains in single-crystals hy low-angle neutron-scattering. Polymer 1976 17 37-A0. 

Guenet JM, Picot C. Conformation of isotactic polystyrene (Ips) in the buUc crystallized state as revealed by small-angle neutron-scattering. Polymer 1979 20 1483-1491. 

The polymer concentration profile has been measured by small-angle neutron scattering from polymers adsorbed onto colloidal particles [70,71] or porous media [72] and from flat surfaces with neutron reflectivity [73] and optical reflectometry [74]. The fraction of segments bound to the solid surface is nicely revealed in NMR studies [75], infrared spectroscopy [76], and electron spin resonance [77]. An example of the concentration profile obtained by inverting neutron scattering measurements appears in Fig. XI-7, showing a typical surface volume fraction of 0.25 and layer thickness of 10-15 nm. The profile decays rapidly and monotonically but does not exhibit power-law scaling [70]. 

Two of the most important functions in the application of neutron scattering are the use of deuterium labelling for the study of molecular confomiation in the bulk state and the use of deuterium solvent in polymer solutions. In the following, we will consider several different applications of die general fomuda to deuteration. 

There are many different data analysis schemes to estimate the structure and molecular parameters of polymers from the neutron scattering data. Herein, we will present several connnon methods for characterizing the scattering profiles, depending only on the applicable q range. These methods, which were derived based on different assumptions, have... 

In polymer solutions or blends, one of the most important thennodynamic parameters that can be calculated from the (neutron) scattering data is the enthalpic interaction parameter x between the components. Based on the Flory-Huggins theory [4T, 42], the scattering intensity from a polymer in a solution can be expressed as... 

The methods used to characterise polymers are partly familiar ones like X-ray diffraction, Raman spectroscopy and electron microscopy, partly less familiar but widespread ones like neutron scattering and nuclear magnetic resonance, and partly... 

Kitagawa, T. and Miyazawa, T. Neutron Scattering and Normal Vibrations of Polymers. Vol. 9, pp. 335-414. 

Silylated diamines, 156, 187-188 Silylated monomers, 72 Silylation, distillation and, 338 6NT6 alternating polyesteramide, synthesizing, 189-190 6,6 -linked polymers, 480 Size exclusion chromatography (SEC) analyses, 90, 490 Slabstock foam, 233-234 Slow monomer addition, 57 Small-angle neutron scattering (SANS), 282... 

The overall result is that in the melt the polymer molecules adopt Gaussian configurations and behave as thermodynamically ideal entities. This combination of ideality and chain entanglement has been confirmed by neutron scattering experiments and is well established despite the apparent paradox. 

McLeish, T.C.B. et al. Dynamics of entangled H-polymers Theory, rheology, and neutron scattering. Macromolecules, 32, 6734, 1999. 

Roe, R.J., X-Ray and Neutron Scattering from Polymers, Academic Press New York, 2001. 

The conformation of polymer chains in an ultra-thin film has been an attractive subject in the field of polymer physics. The chain conformation has been extensively discussed theoretically and experimentally [6-11] however, the experimental technique to study an ultra-thin film is limited because it is difficult to obtain a signal from a specimen due to the low sample volume. The conformation of polymer chains in an ultra-thin film has been examined by small angle neutron scattering (SANS), and contradictory results have been reported. With decreasing film thickness, the radius of gyration, Rg, parallel to the film plane increases when the thickness is less than the unperturbed chain dimension in the bulk state [12-14]. On the other hand, Jones et al. reported that a polystyrene chain in an ultra-thin film takes a Gaussian conformation with a similar in-plane Rg to that in the bulk state [15, 16]. 

Jones, R. L Kumar, S. K., Ho, D. L., Briber, R. M. and Russell, T. P. (2001) Chain conformation in ultrathin polymer films using small-angle neutron scattering. Macromolecules, 34, 559-567. 

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