Methacrylic neutron scattering

O Reilly, J. M., Teegarden, D. M. and Wignall, G. D. (1985) Small-angle and intermediate-angle neutron-scattering from stereoregular poly(methyl methacrylate). Macromolecules, 18, 2747-2752. 

MAPTAC MP MSLLS NIPA SANS methacryl-amido-propyl-trimethyl-ammonium-chloride a-methyl-D-mannopyranoside microscope laser light scattering iV-isopropylacrylamide smaU-angle neutron scattering... 

The Debye function describes the q dependence of scattering data from dilute solutions of ideal chains. Such dilute solutions can either be obtained in a (9-solvent or by having a dilute solution of ordinary chains in a melt of perdeuterated chains. Small-angle neutron scattering data for four dilute concentrations of poly(methyl methacrylate) (PMMA with 2.50 000 g/mol ) in perdeuterated PMMA are shown to be fit by the Debye... 

The onset of ordered structure formation in sterically stabilized dispersions has also been reported by Ottewill (1980). Monodisperse poly(methyl methacrylate) latices, of core diameter 65 nm, were stabilized by low molecular weight poly(12-hydroxystearic acid) in dodecane. Again small angle neutron scattering provides a powerful tool to explore the structure of these ordered configurational states. It might be anticipated that the hard steric repulsion in these systems would narrow the coexistence region noticeably. 

The molecular mechanisms for a number of these subglass transition relaxations have now been established, often by relating the temperature dependence of the frequency of the observed mechanical or dielectric relaxations to specific molecular motions, identified using either experiments (e.g., NMR and neutron scattering) or, more recently, computer simulations. By way of illustration, some examples of group motions that have been found to be active in a series of poly(alkyl methacrylate)s will be described in the following text. 

Genix, A. C., Arbe, A., Alvarez, R, Colmenero, J., Willner, L., and Richter, D. 2005. Dynamics of poly(ethylene oxide) in a blend with poly(methyl methacrylate) A quasielastic neutron scattering and molecular dynamics simulations study. Physical Review E 72 031808-20. 

Small-angle neutron scattering may be used to measure the size of the molecular envelope, which is usually expressed as the radius of gyration of the molecule. This is achieved by dissolving partially deuterated polymers in undeuterated material. Experiments of this type have been reported by Kirste and Ohm and by Keller et Both studied methacrylate-based side-chain liquid crystal polymers in which only the backbone was deuterated. Kirste and Ohm used the... 

HadziJoannou and R. S. Stein. Neutron scattering studies of dimensioos and of intetac tions between componenu in polystyrene/poly (vinyl methyl ether) and poly (vinylidene fluorideVpoly (methyl methacrylate) amorphous blends. Mocromolecula 77 567 (1 ). 

NC Inceoglu, S., Young, N.P., Jackson, A.J., Kline, S.R., Costeux, S., and Balsara, N.P., Effect of supercritical carbon dioxide on the thermodynamics of model blends of styrene-acrylonitrile copolymer and poly(methyl methacrylate) studied by small-angle neutron scattering, Macrowro/ecM/ex, 46, 6345, 2013. 

The small-angle neutron scattering technique was further adopted to study the partitioning of monomer between the microemulsion droplets and latex particles for a variety of monomers (styrene, n-butyl methacrylate, r-butyl... 

Fig. 5. Bilogarithmic plots of b(0, c)/b(0,0) (or bfq >q—cl/b(0.0)l vs [t)]c fw modoately ixmcentrated solutions of flexible chain polymers undbr two thermodynamic conditions b(0,0f = So/3 Upper. b(q > q, c)/b(0,0) determined undn Flory Th solvent conditions the symbols are defined in Fig. 5 of [18]. The solid curve rqiiesents (0, c)/ o/3 ). see Eq. (30) After Ref. [18]. Lower. b(0, c)/b(0,0) determined under good solvent cMiditions the symbols are for data given in [39] and b((), c) determined by li t scattering, unfilled, or neutron scattering, fitted polydimethyl siloxane, diamonds, polystyrene, squares and poly(methyl methacrylate), triangles. The solid curve represents (0, c)/(Ro/3 ). see (30)...

Saiani A, Guenet JM. On the helical form in syndiotactic poly (methyl methacrylate) thermoreversible gels as revealed by smaU-angle neutron scattering. Macromolecules 1997 30 966-972. 

FH = Flory-Huggins GF = generalized Flory GFD = generalized Flory dimer HNC = hypemetted chain HTA = high temperature approximation IFJC = ideal freely joined chain ISM = interaction site model LCT = lattice cluster theory MS = Martynov-Sarkisov PMMA = polymethyl methacrylate PRISM = polymer reference interaction site model PVME = polyvinylmethylether PS = polystyrene PY = Percus-Yevick RMMSA = reference molecule mean spherical approximation RMPY = reference molecular Percus-Yevick SANS = small angle neutron scattering SFC = semiflexible chain TPT = thermodynamic perturbation theory. 

Figure 1 (A) Decomposition of the quasieiastic scattering at Q = 2.06 A- from selectively deuterated syndiotactic poly(methyl methacrylate) at 25°C into a deita function (sharp component) superimposed on a Lorentzian (broad component), due to the ester methyi rotation. Both components are resoiution broadened. (B) EISF for the same sample. The data points have been corrected for coherent scattering and the soiid iine is a fit using Equation [4]. (Data recorded with INS and INS at the ILL). Reproduced with permission from Gabrys B, Higgins JS, Ma KT and Roots JE (1984) Rotational motion of the ester methyl group in stereoregular poly(methyl methacrylate) A neutron scattering study. Macromolecules M 560-566.

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