AKRIL (MET)KISLOTA VA STIROL ASOSIDA SOPOLIMERLAR SINTEZIGA INITSIATOR MIQDORI, ERITUVCHI TABIATI VA MONOMERLAR MOL NISBATINING TA’SIRI
Keywords:
sopolimerlanish, akril kislota, stirol, initsiator, erituvchi, mol nisbati, sopolimerlanish konstantalari, depressor qo‘ndirma, biodizel yoqilg‘isi, molekulyar massa, Q-e sxema.Abstract
Ushbu maqolada biodizel yoqilg‘isi uchun depressor qo‘ndirmalar sifatida qo‘llaniladigan akril kislota (AK) va stirol asosidagi sopolimerlar sinteziga ta’sir etuvchi asosiy omillar – initsiator miqdori, erituvchi tabiati, reaksiya harorati, davomiyligi va dastlabki monomerlarning mol nisbati tadqiq qilingan. Sopolimerlanish reaksiyasi diazomoy kislotasining dinitrili (DAK) initsiatori ishtirokida turli qutbli va qutbsiz erituvchilarda (dioksan, benzol, dimetilformamid, dimetilsulfoksid) olib borilgan. Sopolimerlanish konstantalari Mayo-Lyuis grafik usulida, monomerlarning solishtirma faollik va qutblanganlik ko‘rsatkichlari esa Alfrey-Prays Q-e sxemasi yordamida aniqlangan. Tadqiqotlar natijasi shuni ko‘rsatdiki, AK stirolga nisbatan faolroq monomer hisoblanib (r₁>1, r₂<1), sopolimer zanjirida almashinuvchi tuzilma hosil bo‘lishga moyillik mavjud. Sopolimerning unumi va molekulyar massasiga maqbul sharoit: harorat 70°C, monomerlar nisbati 1:1, initsiator miqdori 0,7%, reaksiya davomiyligi 3 soat ekanligi isbotlangan.
References
[1] Viacheslav A. Ershov et al. Investigating the mechanism of action of polymer pour point depressants on cold flow properties of biodiesel fuels // Colloids and Surfaces A: Physicochemical and Engineering Aspects. – 2024. – Vol. 700. – P. 134758.
[2] Li Chen, Changhe Li et al. Effects of comb-like poly-α-olefins on the cold flow properties of diesel fuel // Fuel. – 2023. – Vol. 354. – P. 129384.
[3] Minqiang Chen et al. Effects of N-containing pour point depressants on the cold flow properties of diesel fuel // Fuel. – 2020. – Vol. 280. – P. 118636.
[4] Guohua Zhou et al. Research on combined-pour point depressant of methacrylate-acrylamide copolymers and ethylene-vinyl acetate copolymers for diesel fuel // Fuel. – 2021. – Vol. 288. – P. 119836.
[5] P.H.M. Van Steenberge et al. Radical Polymerization of Acrylates, Methacrylates, and Styrene: Biobased Approaches, Mechanism, Kinetics, Secondary Reactions, and Modeling // Industrial & Engineering Chemistry Research. – 2022. – Vol. 61(4). – P. 1444–1474.
[6] O. Borisova et al. Control over the relative reactivities of monomers in RAFT copolymerization of styrene and acrylic acid // RSC Advances. – 2018. – Vol. 8. – P. 8857–8868.
[7] J.E. Saidov, G.A. Ixtiyarova. Biodizel yoqilg‘isi uchun aminopolisaxarid xitozan hamda stirol va (met)akril kislota sopolimerlari asosidagi ekologik toza qo‘ndirmalar olishning resurstejamkor texnologiyasini takomillashtirish: DSc dissertatsiya. – Toshkent: ToshDTU, 2026. – 185 b.
[8] T. Alfrey, C.C. Price. Relative reactivities in vinyl copolymerization // Journal of Polymer Science. – 1947. – Vol. 2(1). – P. 101–106.
[9] M. Maric et al. Styrene/Acrylic Acid Random Copolymers Synthesized by Nitroxide-Mediated Polymerization: Effect of Free Nitroxide on Kinetics and Copolymer Composition // Macromolecules. – 2008. – Vol. 41. – P. 6299–6308.
[10] Dainippon Ink and Chemicals, Inc. Process for producing styrene/(meth)acrylic acid copolymer // US Patent 4937298. – 1990.
