Polymer Engineering and Science articles from February 2003

Polymer Engineering and Science archives from February 2003

Effect of ground fluororubber vulcanizate powder on the properties of fluororubber compound.
February 1, 2003... INTRODUCTION Recycling of waste rubber is important for both economic and environmental reasons. A potentially attractive method is to grind waste vulcanized rubber and use the resultant powder as a compounding Ingredient or as a...

Recycling of silicone rubber waste: effect of ground silicone rubber vulcanizate powder on the properties of silicone rubber.
February 1, 2003... INTRODUCTION Disposal of worn-out rubber products and factory wastes is a global problem for both environmental and economic reasons. A potentially attractive method Is to grind vulcanized rubber and use the resultant powder as a...

Influence of chemical composition on the rheological behavior of condensation reaction resins.
February 1, 2003... INTRODUCTION Polymers based on melamine (1,3,5-triamino-2,4,6-triazine) and formaldehyde have been used commercially for over 60 years. Originally used as wood adhesives, they are now mainly found in flooring and decorative laminates,...

Study of the different flow patterns in the melting section of a co-rotating twin-screw extruder.
February 1, 2003... INTRODUCTION Twin-screw extrusion (TSE) Involves solid conveying, melting, mixing, venting and homogenizing, and the extrusion process affects the quality of polymer products considerably. Co-rotating twin-screw extruders are mainly used...

Study on composition and characteristics of maleated ethylene-octene copolymer prepared by reactive extrusion on the morphology and properties of polyamide 6/ethylene-octene copolymer blends.
February 1, 2003... INTRODUCTION Toughening of polyamide (PA) with elastomeric materials has been of considerable commercial and scientific interest. Commonly used elastomers are ethylene-propylene copolymer (EPM) (1-5) and ethylenepropylene diene terpolymer...

Rheological properties of hyperbranched polymer/poly(ethylene terephthalate) reactive blends.
February 1, 2003... 1. INTRODUCTION Poly(ethylene terephthalate) (PET) is a polymer produced worldwide on a large scale and with numerous applications ranging from fibers to films, bottles and packaging. However, during processing, thermal, oxidative and...

On the dynamic mechanical behavior of polyimides based on aromatic and alicyclic dianhydrides.
February 1, 2003... INTRODUCTION In recent years, there has been increasing interest in the understanding of macroscopic properties of polymers such as ductility, dielectric behavior, gas permeation character, and so on. In the field of amorphous polymers,...

In-line color monitoring of polymers during extrusion using a charge coupled device spectrometer: color changeovers and residence time distributions.
February 1, 2003... INTRODUCTION In the extrusion of pigmented polymers, color is normally measured off-line on selected product sample plaques. Our research is directed at the development of an in-line color monitoring system: the color of the molten polymer...

Mechanical relaxations in heat-aged polycarbonate. Part I: comparison between two molecular weights.
February 1, 2003... INTRODUCTION It has been widely reported in the literature (e.g. 1-9 that amorphous poly-bisphenol-A-carbonate embrittles upon heat-aging or annealing below the glass transition temperature, [T.sub.9]. The loss in ductility is accompanied...

Mechanical relaxations in heat-aged polycarbonate. Part II: statistical analysis of low-molecular weight data.
February 1, 2003... INTRODUCTION In Part I of this paper, a Dynamic Mechanical Analyzer (DMA) was utilized to determine secondary transitions ([[beta].sub.1], [gamma]) in order to relate the relaxation of whole, or part of polycarbonate chain segments with...

Environmental stress cracking (ESC) of plastics caused by non-ionic surfactants.
February 1, 2003... INTRODUCTION Plastic materials are widely used in many kinds of appliances. These materials are expected to be resistant to the environment in which the appliances are used. In particular, outer parts frequently come into contact with many...

Binary and ternary blends of recycled high-density polyethylene containing polypropylenes +.
February 1, 2003... INTRODUCTION There is general agreement that it is very difficult to develop value-added applications for many post-consumer plastics. The difficulty is in providing sufficient economic return to justify the costly and laborious task of...

Lifetime prediction for ABS pipes subjected to combined pressure and deflection loading.(acrylonitrile-butadiene-styrene )
February 1, 2003... 1. A FRACTURE MECHANICS APPROACH TO LIFETIME PREDICTION Though plastic pressure pipes are designed to avoid failure by gross yielding, premature brittle fracture has been reported to occur in service (Australian/New Zealand Water Supply,...

Attenuating PP/PET bicomponent melt blown microfibers.(polyethylene terephthalate)
February 1, 2003... INTRODUCTION Melt blowing is one of the most popular processes for making ultra-fine fibers on the micrometer or sub-micrometer scale. It is finding applications in an increasing number of fields, such as filtration, absorbency, hygiene...

Synthesis and crystallization behavior of nylon 12 14. II: chain-folded lamellar crystals and crystalline transformation behavior of nylon 12 14.
February 1, 2003... INTRODUCTION Nylons are very important polymeric materials because of their special properties. Generally, most even-even nylons are polymerized by the method of polycondensation of diamine and diacid (1). The investigation of nylon...

Effect of [CO.sub.2] on crystallization kinetics of poly(ethylen terephthalate).
February 1, 2003... INTRODUCTION The presence of dissolved [CO.sub.2] in polymer affects polymer properties in both molten and solid states. For example, Gendron et al. (1) and Lee et al. (2) reported that [CO.sub.2] dissolved into the polymer causes a...

Mechanical properties of low nano-silica filled high density polyethylene composites.
February 1, 2003... INTRODUCTION It has been demonstrated that inorganic nanoparticles are promising fillers in the modification of polymers. In contrast to the routinely used micrometer-sized particulates, nanoparticles are able to provide polymer composites...

Mechanical behavior of a semicrystalline polymer before necking. Part II: modeling of uniaxial behavior.
February 1, 2003... MODELING OF THE MECHANICAL BEHAVIOR OF SEMICRYSTALLINE POLYMERS IN THE SMALL STRAINS DOMAIN--FAILURE OF THE VISCOELASTIC MODELS Only the viscoelastic behavior has been admitted in the pre-necking domain of semicrystalline polymers (SOPs)...