Wiley
0025-116X
0025-116X
Cơ quản chủ quản: N/A
Các bài báo tiêu biểu
Crystalline forms of isotactic polypropylene
Tập 75 Số 1 - Trang 134-158 - 1964
AbstractThe X‐ray diffraction patterns of two crystalline forms of isotactic
polypropylene, the β‐ and γ‐forms distinct from the α‐form described by NATTA1,
have been recorded. The β‐form, previously observed only as single spherulites6
has now been obtained in a well crystalline polymer, practically free of α‐form.
The γ‐form is obtained, free of α‐form, in stereoblock fractions taken over the
ra...
Catalyse de transformation des oléfines par les complexes du tungstène. II. Télomérisation des oléfines cycliques en présence d'oléfines acycliques
Tập 141 Số 1 - Trang 161-176 - 1971
AbstractLa co‐réaction des oléfines cycliques avec les oléfines acycliques en
présence des systèmes WOCl4/Al(C2H5)2Cl et WOCl4/Sn(C4H9)4 conduit à une
télomérisation de l'oléfine cyclique; aux extrémités des molécules de télomère
sont fixés deux groupements, identiques ou différents, issus de l'oléfine
acyclique par une réaction non consécutive.Ont été plus particulièrement
étudiés: le cyclopentèn...
Synthesis of substrate‐selective polymers by host‐guest polymerization
Tập 182 Số 2 - Trang 687-692 - 1981
Permeability of solutes through hydrated polymer membranes. Part I. Diffusion of sodium chloride
Tập 118 Số 1 - Trang 19-35 - 1968
AbstractBased on an analysis by the free volume theory of diffusion, a study of
the diffusion coefficients, D2, the distribution coefficients, κ2, and the
permeability coefficients, P, of NaCl in various hydrophilic polymers was made
with the assumptions that the free volume of a polymer/diluent system is
linearly proportional to the volume fraction of diluent (H), and that NaCl
permeates only thr...
Topochemical reactions of monomers with conjugated triple‐bonds. IV. Polymerization of bis‐(p‐toluene sulfonate) of 2.4‐hexadiin‐1.6‐diol
Tập 145 Số 1 - Trang 85-94 - 1971
AbstractSolid‐state polymerization of the bis‐(p‐toluene sulfonate) of
2.4‐hexadiin‐1.6‐diol was achieved by UV‐irradiation or by annealing the monomer
crystals below their melting‐point. Deep red polymer crystals having the
original shape of the monomer crystals exhibiting strong dichroism are obtained.
Polymerization proceeds by 1.4‐addition to the conjugated triple‐bonds to form a
polymer with ...
Synthesis and phase behaviour of liquid crystalline polyacrylates
Tập 183 Số 10 - Trang 2311-2321 - 1982
AbstractThe synthesis and phase behaviour of a series of polymers having liquid
crystalline sidechains and a poly(acrylic acid) backbone are described. These
polymers show a dependence of the phase transition temperatures on molecular
weight. In copolymers of two liquid crystalline acrylic esters, induced smectic
phases occur. A comparison of the phase transitions of the different
polyacrylates, w...
Thermal analysis of poly(butylene terephthalate) for heat capacity, rigid‐amorphous content, and transition behavior
Tập 189 Số 10 - Trang 2443-2458 - 1988
AbstractThermal analysis was performed on poly(butylene terephthalate), PBT,
between 210 and 560 K. By combination of experimental heat capacities with
computations with an approximate frequency spectrum of 65 group and 19 skeletal
vibrations, preliminary recommended ATHAS (1988) heat capacities are proposed
for the solid state from 0 to 600 K. The Tarasov parameters used for the
computation of th...
ÜBer den einfluß der lösungsmittel auf die struktur linearer makromoleküle. I
Tập 50 Số 1 - Trang 20-36 - 1961
AbstractEs werden einige Methoden angegeben, nach denen der von ausgeschlossenen
Volumeneffekten unbeeinflußte Trägheitsradius 〈R02〉1/2 bestimmt werden kann. Die
theoretische Forderung LIFSONS, daß selbst dieser Trägheitsradius noch vom
Lösungsmittel abhängt und sich im allgemeinen vom Trägheitsradius am Θ‐Punkt
unterscheidet, kann an den Beispielen von Polymethylmethacrylat und Polystyrol
bestäti...
Einfluß der kristallstruktur und der überstruktur auf einige eigenschaften von polypropylen
Tập 109 Số 1 - Trang 204-216 - 1967
AbstractIsotaktisches Polypropylen bildet bei der Kristallisation vier
verschiedene Typen von Sphärolithen, die nach PADDEN und KEITH als Typ I bis IV
bezeichnet werden. Die Typen I und II zeigen eine monokline Kristallstruktur,
während die Typen III und IV pseudohexagonal kristallisieren. Die Sphärolithe
vom Typ III und IV sind weniger leicht deformierbar als die normalerweise
gebildeten Typen I ...