Objectives. To study the structure and properties of solutions thermoplastic poly(ether urethane)s (PEUs) to inform their potential use in production fibrous-porous polymer composite materials with a given set performance depending on field practical application. Methods. The composition PEUs was studied by attenuated total reflection infrared (ATR-IR) spectroscopy using program for correcting ...

A combined structural, functional, and genetic approach was used to investigate inhibition of bacterial RNA polymerase (RNAP) by sorangicin (Sor), a macrolide polyether antibiotic. Sor lacks chemical and structural similarity to the ansamycin rifampicin (Rif), an RNAP inhibitor widely used to treat tuberculosis. Nevertheless, structural analysis revealed Sor binds in the same RNAP beta subunit ...

Dental impressions disinfection is important to reduce the risk of cross contamination but this process may produce dimensional distortions. Peracetic acid is a disinfectant agent with several favorable characteristics yet underutilized in Dentistry. The aim of this paper is to compare the dimensional stability of casts obtained from addition silicone and polyether impressions that were immerse...

Neutral polymer bonding agent (NPBA) is one of the most promising polymeric materials, widely used in nitrate ester plasticized polyether (NEPE) propellant as bonding agent. The structure and dynamics of NPBA under different conditions of temperatures and sample processing are comprehensively investigated by solid state NMR (SSNMR). The results indicate that both the main chain and side chain o...

The polyurethane foam material is commonly used and marketed in two forms, namely flexible rigid. Flexible as a cushion, with various applications for commercial products such chair support. Therefore, this study aims to describe the occurrence of fire situation university room filled many chairs. It also provide awareness regarding potential flame hazards, by using modelling method FDS. result...

Discrete particle simulations of column of an aggregate of identical particles impacting a rigid, fixed target and a rigid, movable target are presented with the aim to understand the interaction of an aggregate of particles upon a structure. In most cases the column of particles is constrained against lateral expansion. The pressure exerted by the particles upon the fixed target (and the momen...

A new method for the synthesis of lignin-based liquid polyols was developed. Organosolv lignin reacted with ethylene carbonate in polyethylene glycol as solvent, leading to a full conversion phenolic OH into primary aliphatic groups. These aromatic are obtained single step, without any purification. Upon modification molar mass, wide range hydroxyl values (IOH) can be covered. The up 30%wt have...

Application of impact energy absorption systems in different industries is of special significance. Thin-walled tubes, due to their lightness, high energy absorption capacity, long crushing length and the high ratio of energy absorption to weight, have found ever-increasing application as one of the most effective energy absorption systems. In this research, through  carrying out experimental t...

This study reports the preparation and characterization of composites with recycled poly(vinyl butyral) (PVB) and residue of rigid polyurethane foam (PUr), with PUr contents of 20, 35 and 50 wt %, using an extruder equipped with a Maillefer single screw and injection molding. The components of the composites were thermally characterized using differential scanning calorimetry (DSC) and thermogr...

Measurement of fracture parameters for a rapidly growing crack in syntactic foam sheets using image correlation technique and high-speed photography is presented. The performance of a rotating mirror-type multi-channel high-speed digital camera to measure transient deformations is assessed by conducting benchmark tests on image intensity variability, rigid translation and rigid rotation. Edge-c...