Epoxidized polyurethaneamide and polyesteramide as petroleum pipeline coatings

Blends of polypropylene (PP) and acrylonitrile butadiene rubber (NBR) were prepared with different weight compositions with a plasticorder at 180 C at a rotor speed of 60 rpm for 8 min. The physicomechanical properties and mass swell of the prepared blends were investigated with special reference to the effects of the blend ratio. The prepared epoxidized linseed oil (EL) (i.e., E 0.5 L, E 1 L, E 1.5 L, and E 2 L using 0.5, 1, 1.5, and 2 mol H 2 O 2 /mole of unsaturation in linseed oil) and maleic acid anhydride (MAH) were melt mixed in various contents (i.e., 1, 5, 10, and 15 wt %) with a PP/ NBR blend with a weight ratio of 70/30 and used as compatibilizers. The effect of the compatibilizer contents on the physicomechanical properties and mass swell of the binary blend was investigated. With an increase in the compatibilizer content up to 10 wt %, the blend showed an improvement in the physicomechanical properties and reduced mass swell in comparison with the uncompatibilized one. The addition of a compatibilizer beyond 10 wt % did not improve the blend properties any further. The efficiency of the compatibilizers (10 wt %) was also evaluated by studies of phase morphology (scanning electron microscopy). EXPERIMENTALMaterials PP (isotactic) [Moplen EP-D60R, product of Montell Polyolefins, Italy] with a melt flow index ¼ 0.35 g/ Correspondence to: E. M. Sadek (elham_sadek@hotmail. com).

Section: Methodsmentioning

confidence: 99%

Compatibility study of polypropylene and acrylonitrile butadiene rubber blends

Motawie

Abdelaziz

Rabia

et al. 2010

“…However, the dimensional stability and thermal conductivity at lower density (lower than 38 kg/m 3 of the core density) is not suitable for an insulator in the refrigeration application. Gast et al,4 Khoe et al,5 Motawie et al6 also synthesized some amides for coating purposes. The present study, however, varied the functionality of the RBD PKO‐based polyol with a long chain or higher hydroxyl value compounds by using sorbitol powder (functionality of 8.0) 1.…”

Section: Introductionmentioning

confidence: 99%

Production of a high‐functionality RBD palm kernel oil‐based polyester polyol

Badri

Ahmad

Zakaria

2001

A diol-based refined, bleached, and deodorized (RBD) palm kernel oil polyol was prepared. It was found that the polyurethane foam produced only gives a good compressive strength property at a 45 kg/m 3 molded density. The combination of sorbitol into the polyol system resulted in a better dimensional stability and improved thermal conductivity as well as enhanced compressive strength. These were obtained by increasing the functionality of the polyol (functionality of 4.5) through introduction of a high molecular weight and branching polyhidric compound. Direct polycondensation and transesterification methods were used for the syntheses. The hydroxyl value, TLC, and FTIR were used to study the completion of the reaction. A comparative study of the mechanical properties and morphological behavior was carried out with a diolbased polyol. From the water-blown molded foam (zero ODP) with a density of about 44.2 kg/m 3 and a closed-cell content of 93%, a compressive strength of 222 kPa and a dimensional stability of 0.09, 0.10, and 0.12% at the length, width, and thickness of the foam, respectively, conditioned at Ϫ15°C for 24 h, were obtained. The thermal conductivity improved to an initial value of 0.00198 W/mK, tested at 0°C.

The production of a high‐functionality RBD palm kernel‐based polyester polyol

Badri

Ahmad

Zakaria

2001

ABSTRACT:In this study we correlate parameters describing molecular structure (molar mass distribution, short chain branching content, intermolecular heterogeneity) of different ethylene-hexene Cr-catalyzed copolymers, with slow crack growth and rapid crack propagation resistances, respectively measured with Bent Strip and Charpy tests. The PTREF technique, coupled with classical techniques, was used. Two new indices were proposed to correlate mechanical properties and molecular structure.