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Small-angle neutron scattering and differential scanning calorimetry have been used to probe for changes in the microstructure of nylon fibres following exposure to surfactant, acid and alkali solutions. SANS was also used to investigate fibres that had been subjected to intentional loading, environmental exposure, and natural ageing. A number of structural parameters have been derived. The data are...
Small-angle neuron scattering has been applied to mixtures of deuteropolyethylene terephthalate and polyethylene naphthalene-2,6-dicarboxylate that have been transesterified at temperatures of 543–573 K for a range of times. The change in scattering cross section has been analysed to provide values of the rate constants and, hence, the activation energies for the reaction. Excellent agreement for...
A series of polymeric blends of semicrystalline sulphonated poly(butylene terephthalate) (SPBT) and amorphous polycarbonate (PC) was studied using small angle neutron scattering. The data has been analysed in terms of Debye–Bueche and two correlation length models. It has been concluded that the blend of unsulphonated PBT/PC is partially miscible, and that temperature, blend composition and particularly...
The enthalpy of mixing at 341.45 K of an ethylene-vinyl acetate copolymer mixed with a docosanyl diester of poly(ethylene glycol) has been determined as a function of composition by mixing calorimetry. Endothermic enthalpies were obtained with values in the range 2 to 15 J mol -1 . Small-angle neutron scattering has been used on similar mixtures where the diester was perdeuterated to...
Mixtures of deuterated polyethylene oxide with hydrogenous polymethyl methacrylate and hydrogenous polyethylene oxide with deuterated polymethyl methacrylate have been investigated using small angle neutron scattering. The range of temperatures used was 423-473 K and the volume fraction of polyethylene oxide in the mixtures varied from ca. 0.1 to ca. 0.27. Values of the effective interaction parameter...
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