جستجوی مقالات مرتبط با کلیدواژه « کوپلیمر بلوکی » در نشریات گروه « مهندسی شیمی، نفت و پلیمر »

In this research, polystyrene-poly (ethylene glycol)-polystyrene (PS-b-PEG-b-PS) amphiphilic triblock copolymer was synthesized by atom transfer radical polymerization (ATRP) method. The results of FTIR and NMR analyses were confirmed the successful synthesis of the presented triblock copolymer. The experiments of hydrate inhibition performanc testing were carried out in the presence of methane gas using rocking-cell reactor at initial pressure of 68 bar and 1.5oC, respectively. The potential kinetic inhibitory effect of synthesized PS-b-PEG-b-PS copolymer was investigated at the conectrations of 0.05 and 0.1 wt% and compared with the similar data of commercial inhibitors including polyvinylpyrrolidone (PVP) and Luvicap EG as a polyvinylcaprolactam (PVCap)-based kinetic inhibitor from BASF. The obtained results showed that the synthesized PS-b-PEG-b-PS at concentration of 0.1% wt had about 92% inhibitory performance, while PVP as a commercial inhibitor had up to 84% inhibitory performance. Furthermore, the rate of gas consumption in the presence of the synthesized PS-b-PEG-b-PS was decreased about 6 times compared to Luvicap EG and 2 times less than to PVP one. The synthesized amphiphilic triblock PS-b-PEG-b-PS copolymer by ATRP method could be introduced as a new potential kinetic gas hydrate inhibitor.

Today, polymer materials are widely used due to their diverse properties, low cost, and easy mass production. Polytetrahydrofuran polyethylene glycol (TPEG) block copolymer is one of the prepolymers and precursors of polyurethanes. Polytetrahydrofuran polyethylene glycol block copolymer binder with its flexibility property increases flexibility and elongation, and as a result improves polyurethane properties. In the present work, the synthesis of polyether by chemical depolymerization method from polymer raw materials has been reviewed. TPEG is a hydroxyl-terminated polyether that is synthesized from the raw materials of polytetrahydrofuran (PTHF) and polyethylene glycol (PEG) in the presence of an acid catalyst (sulfuric acid) by chemical polymerization reaction. The synthesis has two simultaneous stages: polymerization of polytetrahydrofuran with an acid catalyst and then coupling the obtained product with polyethylene glycol. Factors such as reaction time and temperature, molecular weight and molar ratio of the reactants and acid catalyst concentration affect the molecular weight and the yield of production. In this copolymer, tetrahydofuran blocks form the soft segment and ethylene oxide blocks form the hard segment of the copolymer. The ratio of the soft segment to the hard segment of this polymer plays an important role in determining properties such as viscosity, density, and glass transition temperature (Tg). Characterization of this polymer is done using various tests including Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), carbon and proton nuclear magnetic resonance spectroscopy (13C NMR and 1H NMR). Researches show that the resulting copolymer is a random block copolymer. The glass transition temperature and melting point of TPEG are -73.5 ℃ and 8.74 ℃, respectively.