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
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 same temperature coefficient. It is concluded that
the velocity of the pheny...
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
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 mol/mol
independent of the degree of polymerization DP (2 ⩽ DP ⩽ 5) is given. It is
demonstrated on oligomers that b...
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
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
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 ESR line shape,
in the slow rotat...
The morphology of semicrystalline segmented poly(ether ester) thermoplastic elastomers
Wiley - Tập 182 Số 12 - Trang 3625-3638 - 1981
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 < 30°C. The spherulites recrystallize to form dendritic
structures on further anneal...
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
AbstractA series of poly(ether/ester)s 1 based on poly(butylene
terephthalate)Systematic IUPAC nomenclature:
poly(oxytetramethyleneoxyterephthaloyl). and poly(ethylene glycol) is
synthesized. 1H and 13C nuclear magnetic resonance, infrared and differential
scanning calorimetry (DSC) measurements prove a block structure of the prepared
copolymers. The DSC curves suggest the existence of a three‐pha...
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
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.
Some solution properties of poly α‐methylstyrenes of low molecular weight
Wiley - Tập 86 Số 1 - Trang 116-123 - 1965
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.
The preparation and properties of head‐to‐head poly(methyl acrylate)
Wiley - Tập 134 Số 1 - Trang 331-333 - 1970
A study of structural order in various polyethylenes at elevated temperatures
Wiley - Tập 178 Số 8 - Trang 2461-2470 - 1977
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 rising temperature, a small
rotation ...
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