Wiley

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The phenyl group motion in polystyrene and a model of restricted internal rotation
Wiley - 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 CH 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
NMR investigation on oligo‐ and poly(galacturonic acid)s; gel formation in the presence of Ca2+ counterions
Wiley - Tập 181 Số 5 - Trang 1059-1070 - 1980
Marguerite Rinaudo, G. Ravanat, M. Vincendon
AbstractIn this paper, the assignment of the 1H and 13C NMR spectra of poly(galacturonic acid)s is proposed; the 4C1 chair conformation of the monomeric unit in poly(galacturonic acid) is confirmed and the composition of the anomeric mixture at the reducing end (α−D)/(β−D) = 35 : 65...... hiện toàn bộ
Enzyme‐analogue built polymers, 6. Synthesis of 5‐vinylsalicylaldehyde and a simplified synthesis of some divinyl derivatives
Wiley - Tập 179 Số 11 - Trang 2647-2651 - 1978
Günter Wulff, Ahmed Akelah
Abstract5‐Vinylsalicylaldehyde, o‐, m‐, p‐divinylbenzenes, and 1,5‐divinylnaphthalene were prepared in high yields by using the Wittig reaction of the corresponding phosphoranes with aqueous formaldehyde.
Relaxation processes in a block copoly(ether‐ester) elastomer investigated by the spin probe method
Wiley - 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 elastomers
Wiley - 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
Poly(ether/ester)s based on poly(butylene terephthalate) and poly(ethylene glycol), 1. Poly(ether/ester)s with various polyether: polyester ratios
Wiley - Tập 191 Số 3 - Trang 603-614 - 1990
S. Fakirov, Tanya Gogeva
AbstractA series of poly(ether/ester)s 1 based on poly(butylene terephthalate) hiện toàn bộ
Some solution properties of poly α‐methylstyrenes of low molecular weight
Wiley - 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.
Calculation of the characteristic ratio of polypropylene containing chemical inversions (head‐to‐head and tail‐to‐tail units)
Wiley - Tập 177 Số 5 - Trang 1493-1500 - 1976
Rafał Szmigielski, Isao Ando, Atsuo Nishioka
AbstractThe characteristic ratio (CR, i.e., a measure for the end‐to‐end distance) of polypropylene was calculated taking into account the chemical inversions such as head‐to‐head and tail‐to‐tail units in the chain and compared with the values calculated previously as a function of the tacticity.
The preparation and properties of head‐to‐head poly(methyl acrylate)
Wiley - Tập 134 Số 1 - Trang 331-333 - 1970
Takayuki Otsu, Shuzo Aoki, Ryozo Nakatani
Topochemical polymerization of monomers with conjugated triple bonds
Wiley - Tập 154 Số 1 - Trang 35-48 - 1972
Gerhard Wegner
AbstractSolid‐state polymerization of monomers with conjugated triple bonds turns out to be a versatile method for synthesis of crystalline polymers of high molecular weight exhibiting a fully conjugated backbone. The reaction is best described as an 1.4‐addition polymerization of the conjugated triple bonds giving rise to a polymer with three cumulated double bond...... hiện toàn bộ
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