Polymer Engineering and Science
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Preparation and characterization of PBT nanocomposites compounded with different montmorillonites
Polymer Engineering and Science - Tập 44 Số 6 - Trang 1012-1018 - 2004
AbstractBecause of their superior mechanical and thermal properties, light
weight, and favorable cost/performance ratio, nanocomposite materials appear to
be suitable replacements for metals and alloys in many industrial applications
in fields such as automotive, structural plastics, electronics, packaging, and
so on (1). The technological relevance of this large‐scale market for polymers
is evide...
The role of specific interactions and transreactions on the compatibility of polyester ionomers with poly(ethylene terephthalate) and nylon 6,6
Polymer Engineering and Science - Tập 38 Số 10 - Trang 1658-1665 - 1998
AbstractThe compatibility of polyester ionomers with polar polymers (i.e.,
poly(ethylene terephthalate) and nylon 6,6) is under investigation for their
potential use as minor component compatibilizers. Binary blends have been
prepared by both solution and melt‐mixed methods to determine the effect of
melt‐processing on blend compatibility. The effect of the sulfonate group and
counterion type on c...
Measurement of thermal conductivity of polymer melts by the line‐source method
Polymer Engineering and Science - Tập 30 Số 2 - Trang 65-70 - 1990
AbstractAn apparatus has been developed for the measurement of thermal
conductivity of polymer melts. Based on the transient “line source method,” it
is ideally suited to these materials because measurements can be made quickly,
before the onset of thermal degradation. Also, little or no sample preparation
is required. A number of commercial polymers have been tested, including some
glass‐fiber fi...
The role of the interface in adhesion phenomena
Polymer Engineering and Science - Tập 17 Số 7 - Trang 467-473 - 1977
AbstractThe role of the interface in adherend‐adherate combinations and in the
strength of adhesive joints has been examined. For the former systems, practical
adhesion (as determined experimentally, for example, by peel, tensile, or shear
strengths) is a function of basic adhesion (determined by intermolecular,
interactions such as van der Waals, electrostatic, or valence type forces) and
many ot...
Thermoset characterization for moldability analysis
Polymer Engineering and Science - Tập 14 Số 3 - Trang 231-239 - 1974
AbstractThe injection molding of thermosetting compounds involves complex
interactions between material parameters and molding conditions, on one hand,
and moldability and the ultimate properties of molded parts, on the other hand.
The main role of the molding variables may be related to their effects on the
cure time and temperature and on the flow and thermal phenomena that affect
orientation an...
Comparative study of the cure kinetics of an unsaturated polyester resin using different procedures
Polymer Engineering and Science - Tập 36 Số 6 - Trang 835-851 - 1996
AbstractThe cure kinetics of an unsaturated polyester resin were studied by
differential scanning calorimetry (DSC), and different dynamic and isothermal
procedures were compared. It was established that the isothermal kinetic
analysis through the isoconversional adjustment lnt = A + E/RT is the method
that offers the most accurate results for unsaturated polyester resin cure
kinetics. From this c...
Study of shear modification of LDPE by an NMR relaxation technique
Polymer Engineering and Science - Tập 36 Số 15 - Trang 2001-2007 - 1996
AbstractA low‐density polyethylene was shear modified by repeated extrusions.
These operations resulted in no detectable changes in the polymer molecular
weight distribution. The apparent melt viscosity and elasticity decreased after
extrusion, as is commonly observed in shear modification. These rheological
effects were fully reversible by annealing the melt. Transverse proton
relaxation measurem...
On the characterization of nonlinear viscoelastic materials
Polymer Engineering and Science - Tập 9 Số 4 - Trang 295-310 - 1969
AbstractStarting with specific constitutive equations, methods of evaluating
material properties from experimental data are outlined and then illustrated for
some polymeric materials; these equations have been derived from thermodynamic
principles, and are very similar to the Boltzmann superposition integral form of
linear theory. The experimental basis for two equations under uniaxial loading
and...
The design and performance of a new miniature mixer for specialty polymer blends and nanocomposites
Polymer Engineering and Science - Tập 44 Số 5 - Trang 868-879 - 2004
AbstractA novel miniature mixer called the “Alberta Polymer Asymmetric
Minimixer” (APAM) was designed, built and tested. In this study, polymer blends
and nanofiber composites were compounded using a total of approximately 2 grams
per sample. This mixer has a unique, asymmetric design consisting of a varying
clearance between the rotor blade tips and the cup wall, enabling the material
to be squee...
Mechanical and morphological properties of poly(butylene adipate‐co‐terephthalate) and poly(lactic acid) blended with organically modified silicate layers
Polymer Engineering and Science - Tập 52 Số 7 - Trang 1420-1428 - 2012
AbstractPoly(butylene adipate‐co‐terephthalate) (PBAT) is a biodegradable
polymer with high ultimate elongation but low modulus. This work studied the
addition of a rigid bio‐based and biodegradable polymer, poly(lactic acid)
(PLA), along with organically modified silicate layers as a conceivable means to
improve the modulus of PBAT. Blending with PLA would also reduce both the cost
of the ultimat...
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