Wiley
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The preparation and characterisation of polymer latices formed in the absence of surface active agents
Wiley - 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...
Molecular characterisation of oxymethylene‐linked poly(oxyethylene)
Wiley - 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...
Synthesis of block copolymers based on oxyethylene chains and their use as polymer electrolytes
Wiley - 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.
Modern experimental methods for the observation of the far infrared spectra of polymers
Wiley - Tập 4 Số 4 - Trang 279-290 - 1972
AbstractThe introduction of very sensitive detectors and the use of phase
modulation has enabled interferometric spectroscopy to be extended downwards in
frequency until the spectral coverage overlaps that provided by microwave
dielectric methods. The radiometric precision available has been steadily
improved by taking advantage of both instrumental and computational advances and
the accuracy whic...
Inhomogeneity of gel and microsyneresis in porous styrene‐divinylbenzene copolymers
Wiley - 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...
Use of DTA with infrared analysis of evolved gas to investigate the effect of flame retardants on gas evolution from pyrolysed cellulose (cotton)
Wiley - 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...
Eutectic solidification of the quasi binary system of isotactic polypropylene and 1, 2,4, 5‐tetrachlorobenzene
Wiley - Tập 9 Số 3 - Trang 258-263 - 1977
AbstractThis paper describes a study on eutectic solidification of the quasi
binary system of un‐fractionated isotactic polypropylene and the faceted growing
diluent 1,2,4,5‐tetrachlorobenzene. According to the Flory‐Huggins theory of
melting point depression the phase diagram of the present system does not
exhibit a eutectic point for equilibrium conditions. However, under experimental
circumstan...
Glass transition of poly(oxymethylene)
Wiley - 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 conductivity behaviour of gamma‐irradiated PEO‐LiX electrolytes. I
Wiley - Tập 20 Số 3 - Trang 275-280 - 1988
AbstractIn an attempt to enhance the room temperature ionic conductivity of
PEO‐LiX films, samples have been exposed to gamma‐irradiation at 78°C. The
success with which cross‐links have been introduced into the amorphous form has
been evaluated from d.s.c. analysis and temperature‐dependent conductivity data.
Retardation of the recrystallisation event, associated with uncomplexed
poly(ethylene ox...
Polyester‐Polyether Block Copolymers II. Thermal and Mechanical Properties of Poly(hexamethylene terephthalate)/Poly(oxytetramethylene) Block Copolymers
Wiley - Tập 10 Số 2 - Trang 115-122 - 1978
AbstractThe melting and crystallisation behaviour of crystalline phases in poly
(hexamethylene terephthalate)/poly(oxytetramethylene) block copolymers have been
investigated in relation to copolymer composition and polyether block molecular
weight (m.w.). In contrast to that in corresponding homopolymer blends, the
polyester crystallinity in the block polymers is greatly reduced by
incorporation o...
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