Effects Of Diluent Content Research Articles

Effect of diluent content and H2/CO ratio on the laminar combustion characteristics of syngas

A constant volume combustion chamber is employed to investigate the laminar burning characteristics of syngas. The effects of changes in diluent gas composition (CO2/N2) and H2/CO ratio on the laminar burning velocity (SL) of syngas are decoupled and analyzed. The instability of laminar flames is analyzed using effective Lewis number, flame thickness, thermal expansion ratio, and linear stability theory. The results indicate that as the amount of diluent gas increases, thermal diffusion instability (TD) increases, while hydrodynamic instability (DL) gradually decreases. With a decrease in the H2/CO ratio, TD gradually decreases, and DL increases. When the diluent content is below 45%, the critical flame radius under N2 dilution conditions exceeds that under CO2 dilution conditions. Above 45%, the situation reverses. As the H2/CO ratio decreases, the critical flame radius gradually increases. When the H2 content is high, the critical flame radius under N2 dilution conditions is larger.

Effects of diluent content on the crystallization behavior and morphology of polyethylene membrane fabricated via thermally induced phase separation process

Thermally induced phase separation technique has been widely applied to produce various commercial high-density polyethylene (HDPE) membranes based on the HDPE/diluent system. In this work, the crystallization behavior and morphological evolution of HDPE/liquid paraffin (LP) blends were systematically investigated by differential scanning calorimetry (DSC), dynamic thermomechanical analysis (DMA), two-dimensional small-angle X-ray scattering (2D-SAXS) and scanning electron microscope (SEM). It is found that the chain mobility of HDPE is promoted and the entanglement density reduces with the introduction of diluent LP. When the LP content is lower than 40%, the liquid diluent distributes randomly in HDPE melt, while as the LP content exceeds 40%, the diluent saturates the inter-molecular space of HDPE, resulting in the full growth of lateral lamellar dimension of PE crystal. On the other hand, the morphologies of HDPE/LP films change considerably with the diluent content. (1) LP content <20%: diluent lives directly in the inter-lamellar region; (2) 20% ≤ LP content ≤40%: diluent will be excluded into the inter-cluster region and leads to the formation of separated LP domains between PE clusters. (3) LP content >40%: diluent will be aggregated between the stacked clusters to create numerous interconnected LP domains which act as the pathways for the gas or liquid permeation after the removal of LP. Accordingly, we provide a new guidance for the condensed structure controlling and the development of PE membranes with diverse functionalities.

Multi-field driven thermochromic films and preparation of multi-color patterns

ABSTRACT In this paper, multi-field driven thermochromic films (TCF) were successfully prepared firstly. The upper layer is polymer-dispersed liquid crystal (PDLC) film prepared by polymerisation-induced phase separation (PIPS), and the lower layer is thermochromic liquid crystal microcapsule film prepared by centrifugal spin-coating method. The effects of diluent content, liquid crystal content and spin coating speed on the electro-optical properties and morphology of the thermochromic films were investigated by three sets of experiments secondly. Finally, multi-field driven multi-colour patterns were successfully prepared by film formation on conductive glass and flexible conductive films. Thermal ageing tests proved that the thermochromic films possess better service life, which provides a possibility for the wide application of liquid crystal films.

Effects of epoxy, hardener, and diluent types on the workability of epoxy mixtures

Three types of epoxy resins, namely, diglycidyl ether of bisphenol A and F, and a third obtained by mixing the two resins, and three types of reactive diluents, based on glycidylether, were used to form epoxy mixtures. The effect of diluent content up to 15 wt% on the viscosities of the three epoxies was investigated. The flow properties of mortars prepared with epoxy, hardener, and diluent, as a binder, were compared with respect to the viscosity and molecular weight of the epoxies and diluents, as well as the viscosity and shape of the hardeners used. Six types of hardeners, including four aliphatic and two based on cycloaliphatic amine, were used in the production of mortars. Furthermore, the effects of the type of epoxy, content, type and functionality of diluents, and the functionality and molecular structure of hardeners, on the pot lives of the mixtures were examined. In this study, it is found that not only the viscosities of resin and diluents but also viscosities and molecular structures of hardener and accelerator are effective on the workability properties of epoxy mortars.

Effect of Diluent Content during Polymerization on Equilibrium Deformational Behavior and Structural Parameters of Polymer Network

AbstractThe deformational behavior of poly(ethylene glycol monomethacrylate) which was crosslinked by ethylene glycol dimethacrylate in a concentration range c = 0.05–1.0 × 10−4 mole/cm.3 and polymerized in the presence of 0.05–0.75 volume parts of water was studied. The deformational behavior of these systems may be described by a two‐parameter equation. We found that the value of the constant C2 and the content of permanent entanglements increased linearly with increasing content of polymer in the polymerizing mixture v0. The efficiency of crosslinking also increased and approached the theoretical value at v0 = 1. The measured data can be expressed by the relation v = Kv + Q, where v is the number of effective network chains, and K and Q are the constants depending on the crosslinking agent content, the crosslinking efficiency, and the entanglement content. On the basis of experimental data obtained it is assumed that the entanglements show partly a permanent effect and partly a labile one, the latter influencing the value of the constant C2.