Small-angle neutron scattering polymers

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... 

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... 

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]. 

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 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. 

Small Angle Neutron Scattering from Polymer Networks... 

The size and shape of polymer chains joined in a crosslinked matrix can be measured in a small angle neutron scattering (SANS) experiment. This is a-chieved by labelling a small fraction of the prepolymer with deuterium to contrast strongly with the ordinary hydrogenous substance. The deformation of the polymer chains upon swelling or stretching of the network can also be determined and the results compared with predictions from the theory of rubber elasticity. 

Several experimental parameters have been used to describe the conformation of a polymer adsorbed at the solid-solution interface these include the thickness of the adsorbed layer (photon correlation spectroscopy(J ) (p.c.s.), small angle neutron scattering (2) (s.a.n.s.), ellipsometry (3) and force-distance measurements between adsorbed layers (A), and the surface bound fraction (e.s.r. (5), n.m.r. ( 6), calorimetry (7) and i.r. (8)). However, it is very difficult to describe the adsorbed layer with a single parameter and ideally the segment density profile of the adsorbed chain is required. Recently s.a.n.s. (9) has been used to obtain segment density profiles for polyethylene oxide (PEO) and partially hydrolysed polyvinyl alcohol adsorbed on polystyrene latex. For PEO, two types of system were examined one where the chains were terminally-anchored and the other where the polymer was physically adsorbed from solution. The profiles for these two... 

Characterization of Dendritically Branched Polymers by Small Angle Neutron Scattering (SANS), Small Angle X-Ray Scattering (SAXS) and Transmission Electron Microscopy (TEM)... 

For both polymer systems the static structure factors were investigated using small angle neutron scattering and the results interpreted in terms of RPA theory. Figure 6.6 displays the temperature-dependent static structure factor obtained from a PE-PEE melt (sample IV). 

Small angle X-ray scattering monitoring the distribution of electron density has been used to probe resin morphology [109]. More recently contrast matched small angle neutron scattering has also been employed [110, 111]. These techniques can also be applied to wet resins and tend to probe the very low dimensions of the polymer matrix structure. More studies are needed to identify the real value of these approaches. 

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