List of Articles
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Open Access Article
1 - A brief overview on the effect of type and curing catalyst concentration and NCO / OH ratio on the pot life of the High energy composite based on hydroxyl terminated polybutadiene
Mohsen Azargoon Abbas Kebritchi Moosa NazariThe pot life of high-energy composites plays a decisive role in the ease of production process and the quality of the finished product's properties. Two effective parameters are the determination of the operating life of the curing agent concentration (NCO / OH ratio) a MoreThe pot life of high-energy composites plays a decisive role in the ease of production process and the quality of the finished product's properties. Two effective parameters are the determination of the operating life of the curing agent concentration (NCO / OH ratio) and the amount of catalyst for curing. In this paper, the effect of different amounts of catalysts and different amounts of R (NCO / OH ratio) on the pot life of HTPB-based high energy composite has been studied from scientific sources. Investigations carried out in this study showed that increasing the amount of catalysts in the curing process increases the viscosity of the high energy composite. Also, increasing the amount of R from 0.8 to 1 speed increases the viscosity and increases the pot life of the application. It is interesting to note that with increasing R, from 1 to 1.1, the viscosity increase rate is higher than R=1 contrary to expectation and pot life increases. Energetic composite based on the IPDI curing agent has two distinct stages of increasing viscosity and two different speeds. This is attributed to the presence of two different reactive groups of isocyanates in the molecular structure of this curing agent. In this study, the effect of DBTDL, FeAA, TEB and TECH catalysts on the pot life of high energy composite based on HTPB has been compared and compared. Also, through the Kissinger and Ozawa equations, the amount of activation energy can be evaluated and compared in systems with a variety of catalysts. Based on this, DBTDL has the least amount of activation energy among the catalysts to be cured, resulting in a higher uptake of polyurethane curing times and a lower pot life. Also, according to the studies, to obtain suitable curing for polyurethane systems and proper pot life, the value of R is equal to 1. Manuscript profile -
Open Access Article
2 - review of the macromolecular and microorganism imprinting
بیتا یاراحمدی seyed mohammad reza milani hoseiniThe term macromolecule refers to a group of molecules with a high molecular weight, composed of smaller units. Macromolecules contain proteins, amino acids, carbohydrates, etc., and play a very important role in the livelihoods, so the identification and detection of m MoreThe term macromolecule refers to a group of molecules with a high molecular weight, composed of smaller units. Macromolecules contain proteins, amino acids, carbohydrates, etc., and play a very important role in the livelihoods, so the identification and detection of macromolecules is of particular importance. Different methods such as fluorescence, NMR, electron microscopy, electrophoresis and HPLC are used to identify and detect macromolecules. A quick and accurate method for detecting macromolecules ismolecular imprinting. Molecular imprinting is one of the most important methods for the detection and quantification of a variety of small molecules, macromolecules and microorganisms (bacteria and viruses). Different imprinting methods are used to detection macromolecules and microorganisms, including surface imprinting, microcontact impeinting and epitope imprinting.Molecular molding compared with other detection methods has features such as low cost, high detection capability, stability, low detection limit and stability. Due to these properties imprinted polymers are used in various fields such as chromatography, drug delivery, nanotechnology and sensor technology. Manuscript profile -
Open Access Article
3 - مروری کوتاه بر تأثیر نوع و غلظت كاتاليزورپخت و نسبت کاNCO/OH بر عمر کاربری كامپوزیت پرانرژی بر پایه پلی بوتادین خاتمه یافته با هیدروکسیل
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Open Access Article
4 - تعیین پارامترهای جریانیابی در سیالات دارای تنش تسلیم و لیزخوردگی در دیواره به کمک رئومتری جریان اسکوئیز
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Open Access Article
5 - چاپگرهای سه بعدی با فناوری ساخت رشته های مذاب
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Open Access Article
6 - مروری بر قالبگیری درشت مولکولها و ريزاندام وارهها
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Open Access Article
7 - پوشش نوين بدنه خودروها
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Open Access Article
8 - لاستیک سبز؛ استایرن-بوتادین محلولی
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Open Access Article
9 - آموزش پلیمر در دانشگاه¬های دولتی مالزی