29 research outputs found
Supplemental Material - Poly-(vinyl alcohol) composite films reinforced with carboxylated functional microcrystalline cellulose from jute fiber
No full textSupplemental Material for Poly-(vinyl alcohol) composite films reinforced with carboxylated functional microcrystalline cellulose from jute fiber by Md Zahid Hasan, Yeasin Arafat, M Mahbubul Bashar, Md Nabi Newaz Niloy, Md Imranul Islam, Shahjalal Khandaker, and AM Sarwaruddin Chowdhury in Composites and Advanced Materials</p
FLUID DISTRIBUTION IN TRANSITION ZONES (Using a New Initial-Residual Saturation Correlation)
No full textABSTRACT The fluid distribution as a function of height in transition zones is often very complex. This may be due to movement of water-oil contact, tilting of the reservoir at some point in time, leak of fluid out of the reservoir zone or complex inflow during secondary migration. The resultant fluid distribution seen in saturation logs may be difficult to model. In this paper we address the changes in fluid distribution versus height, inferred by changes of fluid distribution due to the movement of water-oil contact only. The experimental procedures for determining capillary pressure are based on fluid saturation monitoring by gamma absorption from centrifuge experiments. An analytical capillary pressure-saturation model was fit to the bounding imbibition capillary pressuresaturation data. The drainage-imbibition hysteresis curves were then constructed assuming that these curves have similar shape to that of the bounding imbibition curve. The imbibition hysteresis model proposed may be used to calculate fluid saturation in the reservoir due to the movement of water-oil contact. We also proposed necessary auxiliary equations to solve the new linear and four-parameter (sigmoidal type) initial-residual fluid saturation equations. Thus once the shape of the bounding-imbibition capillary pressuresaturation curve and maximum non-wetting fluid saturation are known one can easily construct any imbibition hysteresis curves that may be required
FLUID DISTRIBUTION IN TRANSITION ZONES (Using a New Initial-Residual Saturation Correlation)
No full textABSTRACT The fluid distribution as a function of height in transition zones is often very complex. This may be due to movement of water-oil contact, tilting of the reservoir at some point in time, leak of fluid out of the reservoir zone or complex inflow during secondary migration. The resultant fluid distribution seen in saturation logs may be difficult to model. In this paper we address the changes in fluid distribution versus height, inferred by changes of fluid distribution due to the movement of water-oil contact only. The experimental procedures for determining capillary pressure are based on fluid saturation monitoring by gamma absorption from centrifuge experiments. An analytical capillary pressure-saturation model was fit to the bounding imbibition capillary pressuresaturation data. The drainage-imbibition hysteresis curves were then constructed assuming that these curves have similar shape to that of the bounding imbibition curve. The imbibition hysteresis model proposed may be used to calculate fluid saturation in the reservoir due to the movement of water-oil contact. We also proposed necessary auxiliary equations to solve the new linear and four-parameter (sigmoidal type) initial-residual fluid saturation equations. Thus once the shape of the bounding-imbibition capillary pressuresaturation curve and maximum non-wetting fluid saturation are known one can easily construct any imbibition hysteresis curves that may be required
FLUID DISTRIBUTION IN TRANSITION ZONES (Using a New Initial-Residual Saturation Correlation)
No full textABSTRACT The fluid distribution as a function of height in transition zones is often very complex. This may be due to movement of water-oil contact, tilting of the reservoir at some point in time, leak of fluid out of the reservoir zone or complex inflow during secondary migration. The resultant fluid distribution seen in saturation logs may be difficult to model. In this paper we address the changes in fluid distribution versus height, inferred by changes of fluid distribution due to the movement of water-oil contact only. The experimental procedures for determining capillary pressure are based on fluid saturation monitoring by gamma absorption from centrifuge experiments. An analytical capillary pressure-saturation model was fit to the bounding imbibition capillary pressuresaturation data. The drainage-imbibition hysteresis curves were then constructed assuming that these curves have similar shape to that of the bounding imbibition curve. The imbibition hysteresis model proposed may be used to calculate fluid saturation in the reservoir due to the movement of water-oil contact. We also proposed necessary auxiliary equations to solve the new linear and four-parameter (sigmoidal type) initial-residual fluid saturation equations. Thus once the shape of the bounding-imbibition capillary pressuresaturation curve and maximum non-wetting fluid saturation are known one can easily construct any imbibition hysteresis curves that may be required
Studies on the cycling, processing and programming of an industrially applicable shape memory polymer Tecoflex® (or TFX EG 72D)
No full text The present investigations were undertaken to find out whether and how often cycling, processing and programming can be repeated, whether repeated programming affects the one way effect and how much irreversible strain the shape memory polymeric material accumulates at a particular temperature. The effect was investigated in dependence of different stress levels, and the effect of both recovery temperature and recovery time was considered. As a model material the commercially and industrially applicable amorphous shape memory polymer Tecoflex® was examined and subjected to 50 programming cycles. Tecoflex® is characterized by a glass transition temperature, Tg, of 74 °C, above which it looses all its strength. During tensile testing at 20 °C (T < Tg), stresses a steady increase to 26 MPa as strains approached the rupture strain of 25%. It is observed that at 60 °C (T < Tg, but near Tg) the material can be strained to more than 2500% before rupture occurs while stresses slowly increase to values less than 0.3 MPa. It turns out that programming, cooling, unloading and heating to trigger the one way effect causes an increase of irreversible strain that is associated with a corresponding decrease of the intensity of the one way effect during the first thermomechanical cycles. </jats:p
Effect of disaccharide, gamma radiation and temperature on the physico-mechanical properties of jute fabrics reinforced unsaturated polyester resin-based composite
No full textStudy on the mechanical, degradation, and interfacial properties of calcium alginate fiber-reinforced polyethylene oxide composites
No full text Calcium alginate fibers (CAFs) were prepared from sodium alginate, which is a natural polymer extracted from brown seaweeds, by extruding aqueous sodium alginate solution (4% by weight) into a calcium chloride (2% by weight) bath. Water uptake of CAF was determined in deionized water at room temperature (25°C) and it was found that the fibers absorbed 49% of water within a minute and indicated strong hydrophilic nature. Polyethylene oxide (PEO) based CAF (as a filler/reinforcing agent) reinforced unidirectional composites (10% fiber by weight) were fabricated by compression molding. Tensile strength, tensile modulus, bending strength, bending modulus, and impact strength of the PEO/CAF composite were found to be 11 MPa, 320 MPa, 18 MPa, 565 MPa, and 12 kJ/m2, respectively. Degradation tests of the PEO/CAF composites were performed for 8 weeks in soil medium and it was found that composites retained almost 50% of its original strength. The interfacial shear strength (IFSS) of the PEO/CAF composites was also measured by single fiber fragmentation test. The IFSS was found to be 0.47 MPa that indicated good fiber–matrix adhesion. </jats:p
Thermo-mechanical behaviour of Shape Memory Polymers, e.g., Tecoflex® by 1WE method: SEM and IR analysis
No full text
