دورية أكاديمية
أعرض في EDS

Copolymerization of ethylene and isoprene via silicon bridge metallocene [rac-Me 2 Si(2-Me-4-Ph-Ind) 2 ZrCl 2 ] catalyst: A new way to control the composition and microstructure of copolymers.

التفاصيل البيبلوغرافية
العنوان: Copolymerization of ethylene and isoprene via silicon bridge metallocene [rac-Me 2 Si(2-Me-4-Ph-Ind) 2 ZrCl 2 ] catalyst: A new way to control the composition and microstructure of copolymers.
المؤلفون: Ali A; School of Materials Science & Engineering, Jiangsu University, Zhenjiang, 212013, PR China; Institute of Chemistry, University of Silesia, Szkolna 9, Katowice, 40-600, Poland; MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, PR China., Naveed A; School of Materials Science & Engineering, Jiangsu University, Zhenjiang, 212013, PR China. Electronic address: ahmadnaveed@ujs.edu.cn., Maroń A; Institute of Chemistry, University of Silesia, Szkolna 9, Katowice, 40-600, Poland., Younis MA; Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, 518060, PR China., Moradian JM; School of Materials Science & Engineering, Jiangsu University, Zhenjiang, 212013, PR China., Yousaf B; Department of Technologies and Installations for West Management, Faculty of Engineering, Silesian University of Technology, Konarskiego 18, 44-100, Gliwice, Poland., Aziz T; School of Engineering Yunqi Campus, Westlake University, Hangzhou, Zhejiang, 310024, PR China., Ali RN; Laboratory of Inorganic Materials for Sustainable Energy Technologies, Mohammed IV Polytechnic University, Benguirer, Morocco., Ahmad N; Department of Chemistry, College of Science, King Saud University, Riyadh, 11451, Kingdom of Saudi Arabia., Alomar SY; Zoology Department, College of Science, King Saud University, Riyadh, 11451, Kingdom of Saudi Arabia., Zheqiang F; MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, PR China., Guo L; School of Materials Science & Engineering, Jiangsu University, Zhenjiang, 212013, PR China. Electronic address: liguo@ujs.edu.cn.
المصدر: Chemosphere [Chemosphere] 2024 Jan; Vol. 347, pp. 140700. Date of Electronic Publication: 2023 Nov 15.
نوع المنشور: Journal Article
اللغة: English
بيانات الدورية: Publisher: Elsevier Science Ltd Country of Publication: England NLM ID: 0320657 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1879-1298 (Electronic) Linking ISSN: 00456535 NLM ISO Abbreviation: Chemosphere Subsets: MEDLINE
أسماء مطبوعة: Publication: Oxford : Elsevier Science Ltd
Original Publication: Oxford, New York, : Pergamon Press.
مواضيع طبية MeSH: Alkenes*/chemistry , Silicon*, Metallocenes ; Polymerization ; Ethylenes/chemistry ; Polymers/chemistry ; Catalysis
مستخلص: The copolymerization of ethylene (E) with isoprene (Ip) was performed catalyzed by a symmetrical catalyst exhibiting a silicon bridge [rac-Me 2 Si(2-Me-4-Ph-Ind) 2 ZrCl 2 with the combination of borate/TIBA activator. The effect of cocatalyst, Ip concentration, and polymerization temperature on the activity, molecular weight (Mw), distribution (MWD), comonomer composition, chain structure (regio- and stereoselectivity), and resulting side reactions were logically addressed. Gel-permeation chromatography (GPC) was used to characterize the Mw and polydispersity, while nuclear magnetic resonance (NMR) was employed for the chain structure of the polymers. The catalytic activity was significantly lower by increasing the Ip concentration in the feed, and the isoprene content in resulting polymers was lower under the reaction condition, leading to higher activity. Insertion of isoprene units in polymer structure demonstrates the higher regioselectivity for the 3,4 connections than the 1,4 connections and is expected to be a high-resistance polymer against acids. The MWD presented monomodal even with a higher concentration (1.44 mol/L) and did not appear as low Mw peaks of Ip. The Mw was higher with a broader MWD when purely TIBA was used as a cocatalyst, and it significantly reduced and presented a narrowed MWD with TEA in the cocatalyst. The higher efficiency of the catalyst for the higher insertion of Ip (C=C double bond) effectively modifies the polymer backbone. It is expected to be a promising candidate for easily degradable and favorable solutions for solving environmental problems caused by PE. wastes.
Competing Interests: Declaration of competing interest There are no conflicts to declare.
(Copyright © 2023 Elsevier Ltd. All rights reserved.)
فهرسة مساهمة: Keywords: Copolymers; Ethylene; Isoprene; Metallocene; Narrow MWD; Regioselectivity; metallocene catalyst.
المشرفين على المادة: 0 (Alkenes)
Z4152N8IUI (Silicon)
0A62964IBU (isoprene)
0 (Metallocenes)
H575A4059Q (2,3,5-triiodobenzoic acid)
91GW059KN7 (ethylene)
0 (Ethylenes)
0 (Polymers)
0 (metallocene)
تواريخ الأحداث: Date Created: 20231117 Date Completed: 20231206 Latest Revision: 20231206
رمز التحديث: 20231215
DOI: 10.1016/j.chemosphere.2023.140700
PMID: 37977533
قاعدة البيانات: MEDLINE
الوصف
تدمد:1879-1298
DOI:10.1016/j.chemosphere.2023.140700