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Ali A, Naveed A, Maroń A, Younis MA, Moradian JM, Yousaf B, Aziz T, Ali RN, Ahmad N, Alomar SY, Zheqiang F, Guo L. Copolymerization of ethylene and isoprene via silicon bridge metallocene [rac-Me 2Si(2-Me-4-Ph-Ind) 2ZrCl 2] catalyst: A new way to control the composition and microstructure of copolymers. CHEMOSPHERE 2024; 347:140700. [PMID: 37977533 DOI: 10.1016/j.chemosphere.2023.140700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 10/03/2023] [Accepted: 11/10/2023] [Indexed: 11/19/2023]
Abstract
The copolymerization of ethylene (E) with isoprene (Ip) was performed catalyzed by a symmetrical catalyst exhibiting a silicon bridge [rac-Me2Si(2-Me-4-Ph-Ind)2ZrCl2 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.
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Affiliation(s)
- Amjad Ali
- 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
| | - Ahmad Naveed
- School of Materials Science & Engineering, Jiangsu University, Zhenjiang, 212013, PR China.
| | - Anna Maroń
- Institute of Chemistry, University of Silesia, Szkolna 9, Katowice, 40-600, Poland
| | - Muhammad Adnan Younis
- Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, 518060, PR China
| | | | - Balal Yousaf
- Department of Technologies and Installations for West Management, Faculty of Engineering, Silesian University of Technology, Konarskiego 18, 44-100, Gliwice, Poland
| | - Tariq Aziz
- School of Engineering Yunqi Campus, Westlake University, Hangzhou, Zhejiang, 310024, PR China
| | - Rai Nauman Ali
- Laboratory of Inorganic Materials for Sustainable Energy Technologies, Mohammed IV Polytechnic University, Benguirer, Morocco
| | - Naushad Ahmad
- Department of Chemistry, College of Science, King Saud University, Riyadh, 11451, Kingdom of Saudi Arabia
| | - Suliman Yousef Alomar
- Zoology Department, College of Science, King Saud University, Riyadh, 11451, Kingdom of Saudi Arabia
| | - Fan Zheqiang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, PR China
| | - Li Guo
- School of Materials Science & Engineering, Jiangsu University, Zhenjiang, 212013, PR China.
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Masoori M, Nekoomanesh M, Posada-Pérez S, Rashedi R, Bahri-Laleh N. A systematic study on the effect of co-catalysts composition on the performance of Ziegler-Natta catalyst in ethylene/1-butene co-polymerizations. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.125423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ali A, Moradian JM, Naveed A, Aziz T, Muhammad N, Maouche C, Guo Y, Yaseen W, Yassen M, Haq F, Hassan M, Fan Z, Guo L. Progress toward Polymerization Reaction Monitoring with Different Dienes: How Small Amounts of Dienes Affect ansa-Zirconocenes/Borate/Triisobutylaluminium Catalyst Systems. Polymers (Basel) 2022; 14:polym14163239. [PMID: 36015497 PMCID: PMC9414859 DOI: 10.3390/polym14163239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 08/04/2022] [Accepted: 08/05/2022] [Indexed: 11/16/2022] Open
Abstract
The objectives of this work were to address the fundamental characteristics of ansa-zirconocene catalyzed E/diene copolymerization and E/diene/1-hexene and E/diene/propylene terpolymerizations, and the quantitative relationship between diene structure and polymer chain propagation rate constant in term of quantifiable catalytic active sites. One of the most important but unknown factors in olefins ansa-zirconocene complexes is the distribution of the catalyst between sites actively participating in polymer chain formation and dormant sites. A set of ethylene/dienes copolymerizations, and ethylene/dienes/1-hexene and ethylene/dienes/1-hexene terpolymerizations catalyzed with ansa-zirconocenes/borate/triisobutylaluminium (rac-Et(Ind)2ZrCl2/[Ph3C][B(C6F5)4]/triisobutylaluminium (TIBA) were performed in toluene at 50 °C To determine the active center [C*]/[Zr] ratio variation in the copolymerization of E with different dienes and their terpolymerization with 1-hexene and propylene, each polymer propagation chain ends were quenched with 2-thiophenecarbonyl, which selectively quenches the metal–polymer bonds through acyl chloride. The ethylene, propylene, 1-hexene, and diene composition-based propagation rate constants (kpE, kpP, kp1-H, and kpdiene), thermal (melting and crystalline) properties, composition (mol% of ethylene, propylene, 1-hexene, and diene), molecular weight, and polydispersity were also studied in this work. Systematic comparisons of the proportion of catalytically [Zr]/[C*] active sites and polymerization rate constant (kp) for ansa-zirconocenes catalyzed E/diene, E/diene/1-hexene, and E/diene/propylene polymerization have not been reported before. We evaluated the addition of 1-hexene and propylene as termonomers in the copolymerization with E/diene. To make a comparison for each diene under identical conditions, we started the polymerization by introducing an 80/20 mole ratio of E/P and 0.12 mol/L of 1-hexene in the system. The catalyst behavior against different dienes, 1-hexene, and propylene is very interesting, including changes in thermal properties, cyclization of 1-hexene, and decreased incorporation of isoprene and butadiene, changes in the diffusion barriers in the system, and its effect on kp.
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Affiliation(s)
- Amjad Ali
- Research School of Polymeric Materials, School of Materials Science & Engineering, Jiangsu University, Zhenjiang 212013, China
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Jamile Mohammadi Moradian
- Biofuels Institute, School of Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Ahmad Naveed
- Research School of Polymeric Materials, School of Materials Science & Engineering, Jiangsu University, Zhenjiang 212013, China
- Correspondence: (A.N.); (L.G.)
| | - Tariq Aziz
- School of Engineering Yunqi Campus, Westlake University, Hangzhou 310024, China
| | - Nadeem Muhammad
- Department of Environmental Engineering, Wuhang University of Technology, Wuhan 430223, China
| | - Chanez Maouche
- Research School of Polymeric Materials, School of Materials Science & Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Yintian Guo
- Zhejiang Hetian Chemical Co., Ltd., Hangzhou 310023, China
| | - Waleed Yaseen
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Maria Yassen
- Research School of Polymeric Materials, School of Materials Science & Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Fazal Haq
- Department of Chemistry, Gomal University, Khyber Pakhtunkhwa 29220, Pakistan
| | - Mobashar Hassan
- Research School of Polymeric Materials, School of Materials Science & Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Zheqing Fan
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Li Guo
- Research School of Polymeric Materials, School of Materials Science & Engineering, Jiangsu University, Zhenjiang 212013, China
- Correspondence: (A.N.); (L.G.)
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Exploring cocatalyst type effect on the Ziegler–Natta catalyzed ethylene polymerizations: experimental and DFT studies. JOURNAL OF POLYMER RESEARCH 2022. [DOI: 10.1007/s10965-022-03050-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
AbstractDue to the important role of cocatalyst in the polymerization process employing industrially favored Ziegler–Natta catalysts, its effect on kinetic behavior, catalyst activity, and polymer properties is discussed. In this paper, triethyl aluminum (TEA) and triisobutyl aluminum (TIBA) have been used as the main cocatalyst ingredient with 10–20 mol percent of diethyl aluminum chloride (DEAC) and ethyl aluminum dichloride (EADC) cocatalysts, being neat TEA the cocatalysts with the highest activity. Moreover, TEA-DEAC and TEA-EADC cocatalysts revealed a built-up kinetic profile, while TIBA-DEAC and TIBA-EADC show a decay-type kinetic curve. According to melt flow index results, no considerable change in flowability was detected in the synthesized polyethylenes (PE). On the other hand, the ethylene insertion and chain termination mechanisms were investigated by means of density functional calculations using Ti active center located in (110) and (104) facets of the MgCl2 surface. To shed light on the bulkiness level of employed cocatalysts, buried volume (VBur) together with the two-dimensional map of cocatalyst systems were considered. Higher VBur of TIBA complex can explain its lower activity and decay type kinetic profile obtained by experimental studies.
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Ali A, Aziz T, Zheng J, Hong F, Awad MF, Manan S, Haq F, Ullah A, Shah MN, Javed Q, Kubar AA, Guo L. Modification of Cellulose Nanocrystals With 2-Carboxyethyl Acrylate in the Presence of Epoxy Resin for Enhancing its Adhesive Properties. Front Bioeng Biotechnol 2022; 9:797672. [PMID: 35155406 PMCID: PMC8832013 DOI: 10.3389/fbioe.2021.797672] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 12/20/2021] [Indexed: 12/30/2022] Open
Abstract
Cellulose nanocrystals (CNCs) have unparalleled advantages in the preparation of nanocomposites for various applications. However, a major challenge associated with CNCs in nanocomposite preparation is the lack of compatibility with hydrophobic polymers. The hydrophobic modification of CNCs has attracted increasing interest in the modern era standing with long challenges and being environmentally friendly. Here, we synthesized CNCs by using cotton as raw material and then modified them with 2-carboxyethyl acrylate to improve their corresponding mechanical, adhesive, contact angle, and thermal properties. Different concentrations (1–5 wt%) of CNCs were used as modifiers to improve the interfacial adhesion between the reinforced CNCs and E-51 (Bisphenol A diglycidyl ether) epoxy resin system. CNCs offered a better modulus of elasticity, a lower coefficient of energy, and thermal expansion. Compared with the standard sample, the modified CNCs (MCNCs) showed high shear stress, high toughness, efficient degradation, thermal stability, and recycling due to the combined effect of the hyperbranched topological structure of epoxy with good compatibility. The native CNCs lost their hydrophilicity after modification with epoxy, and MCNCs showed good hydrophobic behavior (CA = 105 ± 2°). The findings of this study indicate that modification of CNCs with 2-carboxyethyl acrylate in the presence of epoxy resin and the enhancement of the features would further expand their applications to different sectors.
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Affiliation(s)
- Amjad Ali
- Research School of Polymeric Materials, School of Materials Science and Engineering, Jiangsu University, Zhenjiang, China
| | - Tariq Aziz
- College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China
- *Correspondence: Tariq Aziz, ; Li Guo,
| | - Jieyuan Zheng
- College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China
| | - Fan Hong
- College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China
| | - Mahamed F. Awad
- Department of Biology, College of Science, Taif University, Taif, Saudi Arabia
| | - Sehrish Manan
- School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, China
| | - Fazal Haq
- Department of Chemistry, Gomal University, Dera Ismail Khan, Pakistan
| | - Asmat Ullah
- School of Pharmacy, Xi’an Jiaotong University, Xi’an, China
| | - Muhammad Naeem Shah
- College of Electronics and Information Engineering, Shenzhen University, Shenzhen, China
| | - Qaiser Javed
- School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, China
| | - Ameer Ali Kubar
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, China
| | - Li Guo
- Research School of Polymeric Materials, School of Materials Science and Engineering, Jiangsu University, Zhenjiang, China
- *Correspondence: Tariq Aziz, ; Li Guo,
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Ali A, Naveed A, Rasheed T, Aziz T, Imran M, Zhang ZK, Ullah MW, Kubar AA, Rehman AU, Fan Z, Guo L. Methods for Predicting Ethylene/Cyclic Olefin Copolymerization Rates Promoted by Single-Site Metallocene: Kinetics Is the Key. Polymers (Basel) 2022; 14:polym14030459. [PMID: 35160449 PMCID: PMC8839136 DOI: 10.3390/polym14030459] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 01/13/2022] [Accepted: 01/18/2022] [Indexed: 02/01/2023] Open
Abstract
In toluene at 50 °C, the vinyl addition polymerization of 4-vinyl-cyclohexene (VCH) comonomers with ethylene is investigated using symmetrical metallocene (rac-Et(Ind)2ZrCl2) combined with borate/TIBA. To demonstrate the polymerizations’ living character, cyclic VCH with linear-exocyclicπ and endocyclicπ bonds produces monomodal polymers, but the dispersity (Ɖ) was broader. The copolymers obtained can be dissolved in conventional organic solvent and have excellent thermal stability and crystalline temperature (ΔHm), and their melting temperature (Tm) varies from 109 to 126 °C, and ΔHm ranges from 80 to 128 (J/g). Secondly, the distribution of polymeric catalysts engaged in polymer chain synthesis and the nature of the dormant state are two of the most essential yet fundamentally unknown aspects. Comprehensive and exhaustive kinetics of E/VCH have shown numerous different kinetic aspects that are interpreted as manifestations of polymeric catalysts or of the instability of several types of active center [Zr]/[C*] fluctuations and formation rates of chain propagation RpE, RpVCH, and propagation rate constants kpE and kpVCH, the quantitative relationship between RpE, RpVCH and kpE, kpVCH and catalyst structures, their constituent polymer Mw, and their reactivity response to the endocyclic and exocyclic bonds of VCH. The kinetic parameters RpE, RpVCH, kpE, and kpVCH, which are the apparent rates for the metallocene-catalyzed E/VCH, RpE, and kpE values, are much more significant than RpVCH and kpVCH at 120 s, RpE and RpVCH 39.63 and 0.78, and the kpE and kpVCH values are 6461 and 93 L/mol·s, respectively, and minor diffusion barriers are recommended in the early stages. Compared with previously reported PE, RpE and kpE values are 34.2 and 7080 L/mol·s. VCH increases the RpE in the initial stage, as we are expecting; this means that the exocyclic bond of VCH is more active at the initial level, and that the chain transfer reaction of cyclic internal π double is increased with the reaction time. The tp versus Rp, kp, and [Zr]/[C*] fraction count may be fitted to a model that invokes deactivation of growing polymer chains. At tp 120–360 s higher, the incorporation rate of VCH suppresses E insertion, resulting in reduced molecular weight.
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Affiliation(s)
- Amjad Ali
- Research School of Polymeric Materials, School of Materials Science & Engineering, Jiangsu University, Zhenjiang 212013, China; (A.A.); (A.N.)
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China; (Z.-K.Z.); (Z.F.)
| | - Ahmad Naveed
- Research School of Polymeric Materials, School of Materials Science & Engineering, Jiangsu University, Zhenjiang 212013, China; (A.A.); (A.N.)
| | - Tahir Rasheed
- Interdisciplinary Research Center for Advanced Materials, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran 31261, Saudi Arabia
- Correspondence: (T.R.); (L.G.)
| | - Tariq Aziz
- School of Engineering Yunqi Campus, Westlake University, Hangzhou 310024, China;
| | - Muhammad Imran
- Department of Chemistry, Government College University, Lahore 54000, Pakistan; (M.I.); (A.U.R.)
| | - Ze-Kun Zhang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China; (Z.-K.Z.); (Z.F.)
| | - Muhammad Wajid Ullah
- Biofuels Institute, School of Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China;
| | - Ameer Ali Kubar
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China;
| | - Aziz Ur Rehman
- Department of Chemistry, Government College University, Lahore 54000, Pakistan; (M.I.); (A.U.R.)
| | - Zhiqiang Fan
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China; (Z.-K.Z.); (Z.F.)
| | - Li Guo
- Research School of Polymeric Materials, School of Materials Science & Engineering, Jiangsu University, Zhenjiang 212013, China; (A.A.); (A.N.)
- Correspondence: (T.R.); (L.G.)
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TiCl4/MgCl2/MCM-41 Bi-Supported Ziegler–Natta Catalyst: Effects of Catalyst Composition on Ethylene/1-Hexene Copolymerization. Catalysts 2021. [DOI: 10.3390/catal11121535] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
TiCl4/MgCl2/MCM-41 type bi-supported Ziegler-Natta catalysts with different MgCl2/MCM-41 ratios were synthesized by adsorbing TiCl4 onto MgCl2 crystallites anchored in mesopores of MCM-41 (mesoporous silica with 3.4 nm pore size). Ethylene/1-hexene copolymerization with the catalysts was conducted at different 1-hexene concentrations and ethylene pressures. MgCl2/MCM-41 composite supports and the catalysts were characterized by X-ray diffraction (XRD), nitrogen adsorption analysis (BET), and elemental analysis. The copolymers were fractionated by extraction with boiling n-heptane, and comonomer contents of the fractions were determined. Under 4 bar ethylene pressure, the bi-supported catalysts showed higher activity and a stronger comonomer activation effect than the TiCl4/MgCl2 catalyst. In comparison with the TiCl4/MgCl2 catalyst, the bi-supported catalysts produced much less copolymer fraction of low molecular weight and high 1-hexene content, meaning that the active center distribution of the catalyst was significantly changed by introducing MCM-41 in the support. The copolymer produced by the bi-supported catalysts showed similar melting temperature to that produced by TiCl4/MgCl2 under the same polymerization conditions. The space confinement effect of the mesopores of MCM-41 on the size and structure of MgCl2 crystallites is proposed as the main reason for the special active center distribution of the bi-supported catalysts.
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A general cocatalyst strategy for performance enhancement in nickel catalyzed ethylene (co)polymerization. CHINESE CHEM LETT 2021. [DOI: 10.1016/j.cclet.2021.12.036] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Ali A, Uddin A, Jamil MI, Shen X, Abbas M, Aziz T, Hussain M, Hussain S, Fang R, Fan Z, Guo L. Kinetics and mechanistic investigations of ethylene-propylene copolymerizations catalyzed with symmetrical metallocene and activated by TIBA/borate. J Organomet Chem 2021. [DOI: 10.1016/j.jorganchem.2021.121929] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Adnan Akram M, Liu X, Fu Z, Fan Z. Ethylene‐Butadiene Copolymerization and Ethylene‐1‐Hexene‐Butadiene Terpolymerization with a MgCl
2
‐Supported Ziegler‐Natta Catalyst: Polymer Structure and Active Centers. ChemistrySelect 2021. [DOI: 10.1002/slct.202101552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Muhammad Adnan Akram
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China
| | - Xiaoyu Liu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China
| | - Zhisheng Fu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China
| | - Zhiqiang Fan
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China
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Kinetic and thermal study of ethylene-propylene copolymerization catalyzed by ansa-zirconocene activated with Alkylaluminium/borate: Effects of linear and branched alkylaluminium compounds as cocatalyst. JOURNAL OF POLYMER RESEARCH 2021. [DOI: 10.1007/s10965-021-02525-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Ali A, Tufail MK, Jamil MI, Yaseen W, Iqbal N, Hussain M, Ali A, Aziz T, Fan Z, Guo L. Comparative Analysis of Ethylene/Diene Copolymerization and Ethylene/Propylene/Diene Terpolymerization Using Ansa-Zirconocene Catalyst with Alkylaluminum/Borate Activator: The Effect of Conjugated and Nonconjugated Dienes on Catalytic Behavior and Polymer Microstructure. Molecules 2021; 26:molecules26072037. [PMID: 33918422 PMCID: PMC8038244 DOI: 10.3390/molecules26072037] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 03/30/2021] [Accepted: 03/30/2021] [Indexed: 11/22/2022] Open
Abstract
The copolymerization of ethylene‒diene conjugates (butadiene (BD), isoprene (IP) and nonconjugates (5-ethylidene-2-norbornene (ENB), vinyl norbornene VNB, 4-vinylcyclohexene (VCH) and 1, 4-hexadiene (HD)), and terpolymerization of ethylene-propylene-diene conjugates (BD, IP) and nonconjugates (ENB, VNB, VCH and HD) using two traditional catalysts of C2-symmetric metallocene—silylene-bridged rac-Me2Si(2-Me-4-Ph-Ind)2ZrCl2 (complex A) and ethylene-bridged rac-Et(Ind)2ZrCl2 (complex B)—with a [Ph3C][B(C6F5)4] borate/TIBA co-catalyst, were intensively studied. Compared to that in the copolymerization of ethylene diene, the catalytic activity was more significant in E/P/diene terpolymerization. We obtained a maximum yield of both metallocene catalysts with conjugated diene between 3.00 × 106 g/molMt·h and 5.00 × 106 g/molMt·h. ENB had the highest deactivation impact on complex A, and HD had the most substantial deactivation effect on complex B. A 1H NMR study suggests that dienes were incorporated into the co/ter polymers’ backbone through regioselectivity. ENB and VNB, inserted by the edo double bond, left the ethylidene double bond intact, so VCH had an exo double bond. Complex A’s methyl and phenyl groups rendered it structurally stable and exhibited a dihedral angle greater than that of complex B, resulting in 1, 2 isoprene insertion higher than 1, 4 isoprene that is usually incapable of polymerization coordination. High efficiency in terms of co- and ter- monomer incorporation with higher molecular weight was found for complex 1. The rate of incorporation of ethylene and propylene in the terpolymer backbone structure may also be altered by the conjugated and nonconjugated dienes. 13C-NMR, 1H-NMR, and GPC techniques were used to characterize the polymers obtained.
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Affiliation(s)
- Amjad Ali
- Research School of Polymeric Materials Science & Engineering, Jiangsu University, Zhenjiang 212013, China; (A.A.); (W.Y.); (N.I.)
| | - Muhammad Khurram Tufail
- School of Chemistry and Biological Engineering, Beijing Institute of Technology, Beijing 100081, China;
| | - Muhammad Imran Jamil
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China; (M.I.J.); (M.H.); (T.A.)
| | - Waleed Yaseen
- Research School of Polymeric Materials Science & Engineering, Jiangsu University, Zhenjiang 212013, China; (A.A.); (W.Y.); (N.I.)
| | - Nafees Iqbal
- Research School of Polymeric Materials Science & Engineering, Jiangsu University, Zhenjiang 212013, China; (A.A.); (W.Y.); (N.I.)
| | - Munir Hussain
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China; (M.I.J.); (M.H.); (T.A.)
| | - Asad Ali
- National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China;
| | - Tariq Aziz
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China; (M.I.J.); (M.H.); (T.A.)
| | - Zhiqiang Fan
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China; (M.I.J.); (M.H.); (T.A.)
- Correspondence: (Z.F.); (L.G.)
| | - Li Guo
- Research School of Polymeric Materials Science & Engineering, Jiangsu University, Zhenjiang 212013, China; (A.A.); (W.Y.); (N.I.)
- Correspondence: (Z.F.); (L.G.)
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