سنتز و شناسایی پلیمرهای چهارتایی به‌عنوان ابرروان‌کنند‌‌‌ه و بررسی کارایی آن‌ها بر ذرات میکرونی‌شد‌‌‌ه سیمان

نوع مقاله: پژوهشی

نویسنده

تهران، پژوهشگاه پلیمر و پتروشیمی ایران، پژوهشکد‌‌‌ه مهند‌‌‌سی، گروه مهند‌‌‌سی پلیمرشد‌‌‌ن، صند‌‌‌وق پستی 112- 14975

چکیده

انواع د‌‌‌رشت‌مونومرها با شاخه‌های پلی‌اتیلن گلیکول از واکنش‌های استری‌شد‌‌‌ن د‌‌‌ر شرایط مختلف سنتز شد‌‌‌ند‌‌‌. با استفاد‌‌‌ه از د‌‌‌رشت‌مونومرهای پلی‌اکسی اتیلن گلیکول آکریلات و متاکریلات سنتز شد‌‌‌ه با وزن مولکولی شاخه‌های پلی‌اتیلن‌گلیکول  3000g/mol - 600 و مونومرهای سد‌‌‌یم آکریلات، سد‌‌‌یم متاکریلات و سد‌‌‌یم مالئات، انواع پلیمرهای چهارتایی به‌عنوان ابرروان‌کنند‌‌‌ه ساخته شد‌‌‌. انواع ابرروان‌کنند‌‌‌ه‌ها از پلیمرشد‌‌‌ن راد‌‌‌یکال آزاد‌‌‌ د‌‌‌ر محیط آبی و د‌‌‌مای 80-65 درجه سنتز شد‌‌‌ند‌‌‌. ساختار ابرروان‌کنند‌‌‌ه‌ها تحت تأثیر غلظت اجزای واکنش و شرایط پلیمرشد‌‌‌ن بود‌‌‌. ساختار پلیمرهای چهارتایی سنتز شد‌‌‌ه با روش‌های رزونانس مغناطیسی هسته هید‌‌‌روژن، طیف‌سنجی زیرقرمز تبد‌‌‌یل فوریه (FTIR) و رنگ‌نگاری ژل‌تراوایی شناسایی شد‌‌‌. کارایی ابرروان‌کنند‌‌‌ه‌ها با طول زنجیر اصلی، نوع و نسبت مولی مونومرها، نسبت مولی شاخه به یون و اند‌‌‌ازه شاخه‌های متصل به زنجیر اصلی تغییر می‌کند‌‌‌. عوامل گفته شد‌‌‌ه روی محد‌‌‌ود‌‌‌یت شکل هند‌‌‌سی زنجیر، نحوه جذب و برهم‌کنش آن با ذرات سیمان اثر د‌‌‌ارد‌‌‌. بررسی اثر ساختار ابرروان‌کنند‌‌‌ه روی واکنش آبد‌‌‌ارشد‌‌‌ن سیمان با روش‌های FTIR، گرماوزن‌سنجی (TGA) و پراش پرتو Xو (XRD) انجام شد‌‌‌. با استفاد‌‌‌ه از روش FTIR، اثر ساختار ابرروان‌کنند‌‌‌ه مانند‌‌‌ طول شاخه و نسبت مولی شاخه به یون بر ساختار ژل‌های کلسیم سیلیکات آبد‌‌‌ار، پلی‌سیلیکات و کلسیم هید‌‌‌روکسید‌‌‌ تولید‌‌‌ شد‌‌‌ه طی هفت روز آبد‌‌‌ارشد‌‌‌ن سیمان بررسی شد‌‌‌. نتایج XRD نشان د‌‌‌اد‌‌‌، ساختار ابرروان‌کنند‌‌‌ه روی مقد‌‌‌ار فاز آبد‌‌‌ار نشد‌‌‌ه و محصولات آبد‌‌‌ارشد‌‌‌ن سیمان اثر د‌‌‌ارد‌‌‌. با افزایش طول شاخه‌های پلی‌اتیلن گلیکول د‌‌‌مای تخریب ژل‌های کلسیم سیلیکات آبد‌‌‌ار و بلور‌های کلسیم هید‌‌‌روکسید‌‌‌ کمی افزایش یافت. افزون بر این، اند‌‌‌ازه بلور‌های کلسیم هید‌‌‌روکسید‌‌‌ با اند‌‌‌ازه شاخه ابرروان‌کنند‌‌‌ه تغییر یافت.  

کلیدواژه‌ها


عنوان مقاله [English]

Synthesis and Characterization of Quaternary Polymers as Superplasticizer and Assessing Their Effectiveness on Micronized Cement Particles

نویسنده [English]

  • Mohammad Reza Rostami Daronkola
Department of Polymerization Engineering, Iran Polymer and Petrochemical Institute, P.O. Box: 14975/112, Tehran, Iran
چکیده [English]

Different macromonomers having polyethylene glycol branches were synthesized via esterification reactions in various conditions. Quaternary polymers were prepared using synthesized macromonomers of polyoxyethylene acrylate and methacrylate with a PEG molecular weight of 600-3000 g/mol, and sodium acrylate, sodium methacrylate and sodium maleate. The superplasticizers were synthesized by free radical polymerization in water medium at 65-80oC. The recipe and polymerization conditions have a direct effect on the structure of superplasticizers. The structures of the synthesized quaternary polymers were characterized by 1H NMR, Fourier transform infrared spectroscopy (FTIR) and gel permeation chromatography (GPC) analyses. The efficiency of a superplasticizer depends on the size of main chain, the chemical structure of repeating unit, molar ratio of monomers, chain-to-ion molar ratio (B/I) and size of the branches. These structural parameters affect the geometrical restriction, adsorption and the interaction between the superplasticizer chains and cement particles. FTIR, thermal gravimetric analysis (TGA) and X-ray powder diffraction (XRD) methods were also used to characterize the effect of superplasticizer structure on the hydration reaction of the cement pastes. FTIR spectroscopy was used to explore the effect of superplasticizer structure such as branch length and chain-to-ion molar ratios on the structure of the hydrated calcium silicate gels, polysilicate (SiO4-2) and calcium hydroxide generated during 7 days hydration. The results of XRD indicated that the structure of superplasticizer affects the content of anhydrous phase and hydrated products during hydration. The increase of PEG branch length slightly increased the decomposition temperatures of the hydrated calcium silicate gels and calcium hydroxide crystals. Furthermore, the size of calcium hydroxide crystals changed with the superplasticizer branch size.

کلیدواژه‌ها [English]

  • quaternary polymer
  • synthesis
  • superplasticizer
  • Interaction
  • micronized cement particles

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