The phenyl group motion in polystyrene and a model of restricted internal rotationWiley - Tập 179 Số 6 - Trang 1521-1529 - 1978
Wolfram Gronski, N. Murayama
AbstractThe 13C NMR relaxation functions are calculated for the case of restricted rotational diffusion of a CH dipole pair about an internal rotational axis. The model is applied to the interpretation of recent 13C experiments of polystyrene in a region where the relaxation of all C atoms of the phenyl ring exhibits the s...... hiện toàn bộ
Relaxation processes in a block copoly(ether‐ester) elastomer investigated by the spin probe methodWiley - Tập 186 Số 8 - Trang 1679-1683 - 1985
Franciszek Lembicz, R. Ukielski
AbstractRelaxation processes in the soft segment phase of a block copoly(ether‐ester) elastomer were investigated using the spin probe method. Rotational mobility of the two probes, differing in sizes, were analysed and the results were interpreted based on the relaxation diagram. It was found that the change in mobility of the probes, as detected by the change in ...... hiện toàn bộ
The morphology of semicrystalline segmented poly(ether ester) thermoplastic elastomersWiley - Tập 182 Số 12 - Trang 3625-3638 - 1981
Zhu Lilan, Gerhard Wegner
AbstractThe supermolecular structure of melt‐crystallized segmented copoly(ether ester)s based on poly(tetramethylene terephthalate) and poly(tetramethylene oxide) is investigated by polarizing microscopy and electron microscopic techniques. Spherulites are formed on isothermal crystallization at supercoolings ΔTu <...... hiện toàn bộ
Some solution properties of poly α‐methylstyrenes of low molecular weightWiley - Tập 86 Số 1 - Trang 116-123 - 1965
B. J. Cottam, J.M.G. Cowie, S. Bywater
AbstractFractions of poly‐α‐methylstyrene of molecular weights below 15,000 have been prepared. Measurements of molecular weight, intrinsic viscosity and heats of solution have been made in cyclohexane, toluene, and results have been applied to the correction of heats of polymerization, for phase change and heats of solution.
A study of structural order in various polyethylenes at elevated temperaturesWiley - Tập 178 Số 8 - Trang 2461-2470 - 1977
J. E. Preedy, E. J. Wheeler
AbstractChanges in several structural properties of an ethylene homopolymer have been measured and compared with those of ethylene copolymers with simple and complex branchings over a range of temperature from ambient to above the normal [melting temperature]. In the case of the first two polymeric types, a clear behavioural pattern was observed in which, with risi...... hiện toàn bộ