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Mehdizadeh M, Karkhaneh F, Nekoomanesh M, Sadjadi S, Emami M, Teimoury H, Salimi M, Solà M, Poater A, Bahri-Laleh N, Posada-Pérez S. Influence of the Ethanol Content of Adduct on the Comonomer Incorporation of Related Ziegler-Natta Catalysts in Propylene (Co)polymerizations. Polymers (Basel) 2023; 15:4476. [PMID: 38231935 PMCID: PMC10708330 DOI: 10.3390/polym15234476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 10/29/2023] [Accepted: 11/03/2023] [Indexed: 01/19/2024] Open
Abstract
The aim of this work is to investigate the influence of the ethanol content of adducts on the catalytic behavior of related Ziegler-Natta (ZN) catalysts in propylene homo- and copolymerizations (with 1-hexene comonomer) in terms of activity, isotacticity, H2 response, and comonomer incorporation. For this purpose, three MgCl2.nEtOH adducts with n values of 0.7, 1.2, and 2.8 were synthesized and used in the synthesis of related ZN catalysts. The catalysts were thoroughly characterized using XRD, BET, SEM, EDX, N2 adsorption-desorption, and DFT techniques. Additionally, the microstructure of the synthesized (co)polymers was distinguished via DSC, SSA, and TREF techniques. Their activity was found to enhance with the adduct's ethanol content in both homo- and copolymerization experiments, and the increase was more pronounced in homopolymerization reactions in the absence of H2. Furthermore, the catalyst with the highest ethanol content provided a copolymer with a lower isotacticity index, a shorter meso sequence length, and a more uniform distribution of comonomer within the chains. These results were attributed to the higher total surface area and Ti content of the corresponding catalyst, as well as its lower average pore diameter, a larger proportion of large pores compared to the other two catalysts, and its spherical open bud morphology. It affirms the importance of catalyst/support ethanol-content control during the preparation process. Then, molecular simulation was employed to shed light on the iso-specificity of the polypropylene produced via synthesized catalysts.
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Affiliation(s)
- Mohammadreza Mehdizadeh
- Iran Polymer and Petrochemical Institute (IPPI), Tehran 14965/115, Iran; (M.M.); (M.N.); (S.S.); (M.E.)
| | - Fereshteh Karkhaneh
- Iran Polymer and Petrochemical Institute (IPPI), Tehran 14965/115, Iran; (M.M.); (M.N.); (S.S.); (M.E.)
| | - Mehdi Nekoomanesh
- Iran Polymer and Petrochemical Institute (IPPI), Tehran 14965/115, Iran; (M.M.); (M.N.); (S.S.); (M.E.)
| | - Samahe Sadjadi
- Iran Polymer and Petrochemical Institute (IPPI), Tehran 14965/115, Iran; (M.M.); (M.N.); (S.S.); (M.E.)
| | - Mehrsa Emami
- Iran Polymer and Petrochemical Institute (IPPI), Tehran 14965/115, Iran; (M.M.); (M.N.); (S.S.); (M.E.)
| | - HamidReza Teimoury
- Research & Development Center, Kermanshah Polymer Company, Kermanshah 14965/115, Iran; (H.T.); (M.S.)
| | - Mehrdad Salimi
- Research & Development Center, Kermanshah Polymer Company, Kermanshah 14965/115, Iran; (H.T.); (M.S.)
| | - Miquel Solà
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, c/ Maria Aurèlia Capmany 69, 17003 Girona, Spain;
| | - Albert Poater
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, c/ Maria Aurèlia Capmany 69, 17003 Girona, Spain;
| | - Naeimeh Bahri-Laleh
- Iran Polymer and Petrochemical Institute (IPPI), Tehran 14965/115, Iran; (M.M.); (M.N.); (S.S.); (M.E.)
| | - Sergio Posada-Pérez
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, c/ Maria Aurèlia Capmany 69, 17003 Girona, Spain;
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Hejazi S, Restaino OF, Sabbah M, Zannini D, Di Girolamo R, Marotta A, D’Ambrosio S, Krauss IR, Giosafatto CVL, Santagata G, Schiraldi C, Porta R. Physicochemical Characterization of Chitosan/Poly-γ-Glutamic Acid Glass-like Materials. Int J Mol Sci 2023; 24:12495. [PMID: 37569870 PMCID: PMC10419765 DOI: 10.3390/ijms241512495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 08/03/2023] [Accepted: 08/04/2023] [Indexed: 08/13/2023] Open
Abstract
This paper sets up a new route for producing non-covalently crosslinked bio-composites by blending poly-γ-glutamic acid (γ-PGA) of microbial origin and chitosan (CH) through poly-electrolyte complexation under specific experimental conditions. CH and two different molecular weight γ-PGA fractions have been blended at different mass ratios (1/9, 2/8 and 3/7) under acidic pH. The developed materials seemed to behave like moldable hydrogels with a soft rubbery consistency. However, after dehydration, they became exceedingly hard, glass-like materials completely insoluble in water and organic solvents. The native biopolymers and their blends underwent comprehensive structural, physicochemical, and thermal analyses. The study confirmed strong physical interactions between polysaccharide and polyamide chains, facilitated by electrostatic attraction and hydrogen bonding. The materials exhibited both crystalline and amorphous structures and demonstrated good thermal stability and degradability. Described as thermoplastic and saloplastic, these bio-composites offer vast opportunities in the realm of polyelectrolyte complexes (PECs). This unique combination of properties allowed the bio-composites to function as glass-like materials, making them highly versatile for potential applications in various fields. They hold potential for use in regenerative medicine, biomedical devices, food packaging, and 3D printing. Their environmentally friendly properties make them attractive candidates for sustainable material development in various industries.
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Affiliation(s)
- Sondos Hejazi
- Department of Chemical Sciences, University of Naples “Federico II”, 80126 Naples, Italy; (S.H.); (O.F.R.); or (D.Z.); (R.D.G.); (I.R.K.); (C.V.L.G.)
| | - Odile Francesca Restaino
- Department of Chemical Sciences, University of Naples “Federico II”, 80126 Naples, Italy; (S.H.); (O.F.R.); or (D.Z.); (R.D.G.); (I.R.K.); (C.V.L.G.)
| | - Mohammed Sabbah
- Department of Nutrition and Food Technology, An-Najah National University, Nablus P400, Palestine;
| | - Domenico Zannini
- Department of Chemical Sciences, University of Naples “Federico II”, 80126 Naples, Italy; (S.H.); (O.F.R.); or (D.Z.); (R.D.G.); (I.R.K.); (C.V.L.G.)
- Institute for Polymers, Composites, and Biomaterials, National Council of Research, 80078 Pozzuoli, Italy;
| | - Rocco Di Girolamo
- Department of Chemical Sciences, University of Naples “Federico II”, 80126 Naples, Italy; (S.H.); (O.F.R.); or (D.Z.); (R.D.G.); (I.R.K.); (C.V.L.G.)
| | - Angela Marotta
- Department of Chemical, Materials and Production Engineering (DICMaPI), University of Naples “Federico II”, 80126 Naples, Italy;
| | - Sergio D’Ambrosio
- Department of Experimental Medicine, Section of Biotechnology and Molecular Biology, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy (C.S.)
| | - Irene Russo Krauss
- Department of Chemical Sciences, University of Naples “Federico II”, 80126 Naples, Italy; (S.H.); (O.F.R.); or (D.Z.); (R.D.G.); (I.R.K.); (C.V.L.G.)
- Consorzio per lo Sviluppo dei Sistemi a Grande Interfase, 50019 Florence, Italy
| | - C. Valeria L. Giosafatto
- Department of Chemical Sciences, University of Naples “Federico II”, 80126 Naples, Italy; (S.H.); (O.F.R.); or (D.Z.); (R.D.G.); (I.R.K.); (C.V.L.G.)
| | - Gabriella Santagata
- Institute for Polymers, Composites, and Biomaterials, National Council of Research, 80078 Pozzuoli, Italy;
| | - Chiara Schiraldi
- Department of Experimental Medicine, Section of Biotechnology and Molecular Biology, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy (C.S.)
| | - Raffaele Porta
- Department of Chemical Sciences, University of Naples “Federico II”, 80126 Naples, Italy; (S.H.); (O.F.R.); or (D.Z.); (R.D.G.); (I.R.K.); (C.V.L.G.)
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Crystallization Behavior of Isotactic Propene-Octene Random Copolymers. Polymers (Basel) 2022; 14:polym14194032. [PMID: 36235980 PMCID: PMC9572639 DOI: 10.3390/polym14194032] [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: 08/19/2022] [Revised: 09/21/2022] [Accepted: 09/22/2022] [Indexed: 11/16/2022] Open
Abstract
The crystallization behavior of random propene-octene isotactic copolymers (iPPC8) prepared with a homogeneous metallocene catalyst has been studied. Samples of iPPC8 with low octene content up to about 7 mol% were isothermally crystallized from the melt at various crystallization temperatures. The samples crystallize in mixtures of the α and γ forms of isotactic polypropylene (iPP). The relative amount of γ form increases with increasing crystallization temperature, and a maximum amount of γ form (fγ(max)) is achieved for each sample. The crystallization behavior of iPPC8 copolymers is compared with the crystallization from the melt of propene–ethylene, propene–butene, propene–pentene, and propene–hexene copolymers. The results show that the behavior of iPPC8 copolymers is completely different from those described in the literature for the other copolymers of iPP. In fact, the maximum amount of γ form achieved in samples of different copolymers of iPP generally increases with increasing comonomer content, while in iPPC8 copolymers the maximum amount of γ form decreases with increasing octene content. The different behaviors are discussed based on the inclusion of co-monomeric units in the crystals of α and γ forms of iPP or their exclusion from the crystals. In iPPC8 copolymers, octene units are excluded from the crystals giving only the interruption effect that shortens the length of regular propene sequences, inducing crystallization of the γ form at low octene concentrations, lower than 2 mol%. At higher octene concentration, the crystallization of the kinetically favored α form prevails.
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Di Girolamo R, Santillo C, Malafronte A, Scoti M, De Stefano F, Talarico G, Coates GW, De Rosa C. Structure and morphology of isotactic polypropylene–polyethylene block copolymers prepared with living and stereoselective catalyst. Polym Chem 2022. [DOI: 10.1039/d2py00197g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Isotactic polypropylene–polyethylene block copolymers prepared with living and stereoselective catalyst allow linking incompatible crystalline polymers giving a lamellar morphology defined by competition between phase separation and crystallization.
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Affiliation(s)
- Rocco Di Girolamo
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Complesso Monte S. Angelo, Via Cintia, 80126 Napoli, Italy
| | - Chiara Santillo
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Complesso Monte S. Angelo, Via Cintia, 80126 Napoli, Italy
| | - Anna Malafronte
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Complesso Monte S. Angelo, Via Cintia, 80126 Napoli, Italy
| | - Miriam Scoti
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Complesso Monte S. Angelo, Via Cintia, 80126 Napoli, Italy
| | - Fabio De Stefano
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Complesso Monte S. Angelo, Via Cintia, 80126 Napoli, Italy
| | - Giovanni Talarico
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Complesso Monte S. Angelo, Via Cintia, 80126 Napoli, Italy
| | - Geoffrey W. Coates
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, USA
| | - Claudio De Rosa
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Complesso Monte S. Angelo, Via Cintia, 80126 Napoli, Italy
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