Wiley
0007-1641
1934-256X
Cơ quản chủ quản: N/A
Các bài báo tiêu biểu
Electrical conductivity in ionic complexes of poly(ethylene oxide)
Tập 7 Số 5 - Trang 319-327 - 1975
AbstractThe temperature dependence of d.c. conductivity of poly(ethylene oxide)
complexes with sodium iodide and the thiocyanates of sodium, potassium and
ammonium has been investigated. In each case a transition to a lower activation
energy at higher temperatures was observed. For the sodium complexes this
transition occurs at ca 55°C which is well below the crystalline melting points
at 200°C. F...
The preparation and characterisation of polymer latices formed in the absence of surface active agents
Tập 5 Số 5 - Trang 347-362 - 1973
AbstractMethods have been devised for the formation of monodisperse polystyrene
latices in the absence of added surface active agents. The particles are
stabilised, as a colloidal dispersion, by surface groupings which are an
integral part of the particle and are not removed by dialysis. By suitable
variation of the ionic strength of the aqueous phase, the initiator
concentration and the polymeris...
Glass transition of poly(oxymethylene)
Tập 17 Số 1 - Trang 1-3 - 1985
AbstractHeat capacity data of semicrystalline poly(oxymethylene) samples. Delrin
and Celcon, are analysed in order to discuss the glass transition behaviour of
this polymer. There are two types of non‐crystalline poly(oxymetheylene). the
mobile and rigid amorphous parts. The glass transition of the former occurs in a
rather wider range of temperature: it starts at 180 K and could end at 265 K.
The...
The concentration dependence of biopolymer gel modulus
Tập 17 Số 2 - Trang 164-168 - 1985
AbstractGel formation from aqueous biopolymer solutions is a common phenomenon
and one of practical importance, yet it is much less well understood and
characterised than the condensation of synthetic polymer precursors to form
networks. There are many reasons for this, including the complexity of the
aggregating species, the diversity of crosslinking mechanisms, the physical
nature of the attract...
Molecular Interactions in Polysaccharide Gelation
Tập 18 Số 1 - Trang 14-21 - 1986
AbstractThe gel structures formed by naturally occurring polysaccharides, either
in vivo (in, for example, plant tissue) or in vitro after extraction and
purification, are normally crosslinked by extended intermolecular ‘junction
zones’ of conformationally ordered chains. Formation and disruption of these
ordered structures under biologically and industrially relevant conditions of
extensive hydra...
Mechanical properties of globular protein gels: II concentration, pH concentration, ph and ionic strength dependence
Tập 13 Số 1 - Trang 11-16 - 1981
AbstractAqueous gels can be made by heating concentrated solutions of the
globular protein BSA above its unfolding temperature, around 60°. The effect of
such factors as length of heating, protein concentration, pH and ionic strength
on the small deformation shear modulus of the gel is determined. The results may
be rationalised qualitatively in terms of the effect of these factors on the
homogene...
Molecular characterisation of oxymethylene‐linked poly(oxyethylene)
Tập 19 Số 6 - Trang 509-516 - 1987
AbstractTetraethylene glycol (TEG) or polyethylene glycol 200 (PEG200) was
reacted with CH2Br2 in a modified Williamson synthesis to form
oxymethylene‐linked chains. Analytical and preparative gel permeation
chromatography plus nuclear magnetic resonance spectroscopy were used to show
that the product of reaction consisted of rings with degree of condensation n =
1−15 or more (i.e. 14 to 210 or mo...
Inhomogeneity of gel and microsyneresis in porous styrene‐divinylbenzene copolymers
Tập 17 Số 2 - Trang 215-218 - 1985
AbstractThe porosity of styrene‐divinylbenzene copolymers prepared by suspension
copolymerisation of the monomers carried out in the presence of inert diluent
changes due to solvent pretreatment is investigated. The changes seem to reflect
the inhomogeneity of copolymer gel. Various portions of it are transferred from
the rubber‐like into the glassy state at different stages of either swelling
sol...
Synthesis of block copolymers based on oxyethylene chains and their use as polymer electrolytes
Tập 22 Số 2 - Trang 129-135 - 1990
AbstractHigh‐molecular‐weight copolymers were prepared consisting predominantly
of oxyethylene and oxymethylene‐oligo(oxyethylene) blocks with a small
1‐phenylethylene block. Ionic conductivities of mixtures of the copolymers with
CF3SO3Li were measured.
Use of DTA with infrared analysis of evolved gas to investigate the effect of flame retardants on gas evolution from pyrolysed cellulose (cotton)
Tập 20 Số 1 - Trang 61-67 - 1988
AbstractDTA combined with infrared analysis of the evolved gas (EGA) has been
used to study the temperature behaviour, both in air and nitrogen, of commercial
phosphorus‐ and nitrogen‐ and/or bromine‐containing flame retardants applied to
cotton. By reference to the DTA traces and also the maxima occurring in the CO,
CO2 and H2O evolution rates, seven significant peak temperatures were assigned.
T...