Polymer Engineering and Science articles from February 2002

Polymer Engineering and Science archives from February 2002

Phase Separation and gelation of epoxy resin/hyperbranched polymer blends.
February 1, 2002... Jan-Anders E. Manson (*) The structural buildup during reticulation of thermoset systems containing reactive modifiers can strongly influence the final properties of such blends. This was studied by considering the rheological behavior...

Numerical analysis of surface-tension-driven coating flow.
February 1, 2002... Richard H.J. Blunk (*) James O. Wilkes ([delta]) Bondline readout (BLRO) is a coating defect frequently exhibited on adhesively bonded, polymeric automotive body panels painted with high-glamour/flow clearcoats. BLRO or telegraphing...

The effect of stoichiometry on the fracture toughness of a liquid crystalline epoxy.
February 1, 2002... The fracture toughness of a liquid crystalline epoxy was compared with that of a standard bisphenol-A based epoxy to understand how both the liquid crystalline structure and the crosslink density affect fracture toughness. For the liquid...

Tools for multiaxial validation of behavior laws chosen for modeling hyper-elasticity of rubber-like materials.
February 1, 2002... L. Chevalier (*) Y. Marco We present an experimental approach to discriminate hyper-elastic models describing the mechanical behavior of rubber-like materials. An evaluation of the displacement field obtained by digital image...

Plasma surface treatments of melt-extruded sheets of Poly(L-Lactic acid).
February 1, 2002... Toshihiro Hirotsu (1), (*) Kazuo Nakayama (1) Toshiyuki Tsujisaka (2) Andre Mas (3) Francois Schue (3) Poly(L-lactic acid) sheets, prepared by melt extrusion, were treated with [O.sub.2]-, He-, and [N.sub.2]-plasmas...

Verification of extensional viscosity effects in injection mold filling simulation.
February 1, 2002... The effect of extensional viscosity upon wall pressure and front progression in injection molding is presented through experiments and simulations. In order to compare materials having distinctly different responses to extensional flow,...

Effect of polymer matrix on the rheology of hydroxyapatite-filled polyethylene composites.
February 1, 2002... R. Joseph (+) W.J. McGregor (+) M.T. Martyn (*) K.E. Tanner (+a) P.D. Coates (*) W. Bonfield (+**) The effect of matrix polymer and filler content on the rheological behavior of hydroxyapatite-filled injection...

Polyimide and Nylon 6 blend film: Preparation, Characterization and Thermal behavior.
February 1, 2002... Basudam Adhikari (*) A polyimide blend system has been prepared from a base polyimide of BTDA-ODA by adding [epsilon]-caprolactam at the poly(amic acid) stage where [epsilon]caprolactam undergoes polymerization to form nylon 6 during the...

Extrusion blow molding of long fiber reinforced polyolefins.
February 1, 2002... A 58% (by weight) long glass fiber reinforced (LGF]-HDPE master batch was blended with a typical blow molding HDPE grade. HDPE composites having between 5% and 20% (by weight) long fiber content were extruded at different processing conditions...

A step towards understanding the heating phase of laser transmission welding in polymers.
February 1, 2002... In recent years, laser transmission welding has gained in significance by displaying its specific advantages among the established welding processes for thermoplastics. However, a deep understanding of the developed process variants is so far...

Moisture diffusion behavior in bismaleimide resin subjected to hygrothermal cycling.
February 1, 2002... Hung-Jue Sue (*) Absorption-desorption-reabsorption hygrothermal cycling was performed in bismaleimide resin. Dynamic mechanical analysis and swelling experiments were conducted to investigate the effect of hygrothermal cycling on the...

Investigation of appropriate cooling times for electrofusion jointing of PE pipes for gas distribution.
February 1, 2002... Yuji Higuchi (a) Hiroyuki Nishimura (b) Fumio Inoue (c) Tetsuo Ishikawa (d) Seiji Miyaki (e) This study evaluates three types of fusion zones between electrofusion (EF) joints and pipes that were laid underground after...

Analysis of multiaxial impact behavior of polymers.
February 1, 2002... A. Saigal (*) Impact performance is a primary concern in many applications of polymers. In this paper, finite element analysis (FEA) and ABAQUS/Explicit are used to simulate the deformation and failure of polymers in the standard ASTM...

Particle motion in the fountain flow region during filling of a tube with a viscoelastic fluid.
February 1, 2002... Shem O. Ogadhoh (2) Venkata Giri Kolli (1) Thanasis D. Papathanasiou (3) We present the results of an investigation of particle motion behind the advancing free surface during the filling of an initially empty tube with a...

Structure and mechanical properties of blends of an amorphous polyamide and a liquid crystalline polymer.
February 1, 2002... The structure and the mechanical properties of blends of an amorphous polyamide (PA) and a thermotropic copoly(ester-amide) (VB) obtained both by direct injection molding (DI) and also by extrusion and subsequent injection molding (EI) have...

Interlaminar contact development during thermoplastic fusion bonding.
February 1, 2002... R. Pitchumani (*) Fabrication of layered thermoplastics and thermoplastic-matrix composites using processes such as tow placement, tape laying, and resistance welding is fundamentally based on the principle of fusion bonding, which...

Crystallization and melting behavior of Zenite thermotropic liquid crystalline polymers(**).
February 1, 2002... K.P. Pramoda (1) T.S. Chung (1,2(*) The crystallization and melting behavior of a DuPont Zenite[TM] series, namely, Z 6000 and Z 8000B, thermotropic liquid crystalline polymer (TLCP) have been investigated by differential scanning...

Effect of thermotropic copolyesteramide on the properties of polyamide-66/liquid crystalline copolyester composites.
February 1, 2002... X.L. Xie (l.2*) R.K.Y. Li (2) Y.W. MAI (3) S.C. Tjong (2) Liquid ciystalline copolyester-polyamide 66 (LOPES/PA66) composites compatibilized by liquid crystalline copolyesteramide (LCPEA) were prepared by injection molding....

Relating the generation of dynamic strain energy to crack propagation in polymers.
February 1, 2002... With many fracture research studies, there is a need to compare frequently experimental findings and modeling simulations. One example is when studying the relationships between crack velocity and dynamic strain energy generated in polymers. It...