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Articoli di riviste sul tema "Coordinative Polymerization"

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Autore: Grafiati

Pubblicato: 22 giugno 2024

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1

Valente, Andreia, André Mortreux, Marc Visseaux e Philippe Zinck. "Coordinative Chain Transfer Polymerization". Chemical Reviews 113, n. 5 (7 febbraio 2013): 3836–57. http://dx.doi.org/10.1021/cr300289z.

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2

Stere, Cristina, Mihaela Iovu, Adrian Boborodea, Dan Sorin Vasilescu e Iosif Sorin Fazakas-Anca. "Anionic and ionic coordinative polymerization ofL-lactide". Polymers for Advanced Technologies 9, n. 6 (giugno 1998): 322–25. http://dx.doi.org/10.1002/(sici)1099-1581(199806)9:6<322::aid-pat783>3.0.co;2-n.

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3

Stere, Cristina, Mihaela-Corina Iovu, Horia Iovu, Adrian Boborodea, Dan Sorin Vasilescu e Simon James Read. "Anionic and ionic coordinative polymerization of ?-caprolactone". Polymers for Advanced Technologies 12, n. 5 (2001): 300–305. http://dx.doi.org/10.1002/pat.68.

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4

Del Rio, E., M. Galià, V. Cádiz, G. Lligadas e J. C. Ronda. "Polymerization of epoxidized vegetable oil derivatives: Ionic-coordinative polymerization of methylepoxyoleate". Journal of Polymer Science Part A: Polymer Chemistry 48, n. 22 (20 settembre 2010): 4995–5008. http://dx.doi.org/10.1002/pola.24297.

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5

Baulu, Nicolas, Marie-Noëlle Poradowski, Ludmilla Verrieux, Julien Thuilliez, François Jean-Baptiste-dit-Dominique, Lionel Perrin, Franck D'Agosto e Christophe Boisson. "Design of selective divalent chain transfer agents for coordinative chain transfer polymerization of ethylene and its copolymerization with butadiene". Polymer Chemistry 13, n. 14 (2022): 1970–77. http://dx.doi.org/10.1039/d2py00155a.

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6

WANG, Juan, Tingting YANG, Hui PENG e Shiyuan CHENG. "KINETICS OF THE COORDINATIVE CATALYTIC EMULSION POLYMERIZATION OF STYRENE". Acta Polymerica Sinica 011, n. 7 (21 luglio 2011): 718–23. http://dx.doi.org/10.3724/sp.j.1105.2011.10189.

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7

Ronda, Joan Carles, Angels Serra e Virginia Cádiz. "Coordinative polymerization of p-substituted phenyl glycidyl ethers, 2". Macromolecular Chemistry and Physics 198, n. 9 (settembre 1997): 2935–48. http://dx.doi.org/10.1002/macp.1997.021980922.

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8

Yu, Chao, Pengfei Zhang, Fei Gao, Shaowen Zhang e Xiaofang Li. "A displacement-type fluorescent probe reveals active species in the coordinative polymerization of olefins". Polymer Chemistry 9, n. 5 (2018): 603–10. http://dx.doi.org/10.1039/c7py01915g.

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Abstract (sommario):

The correct identification of active species is an important prerequisite to study the mechanism of coordinative polymerization of olefins, which can afford important theoretical guidance for the design and synthesis of new organometallic catalysts and high-performance polyolefin materials.

9

Park, Kyung Lee, Jun Won Baek, Seung Hyun Moon, Sung Moon Bae, Jong Chul Lee, Junseong Lee, Myong Sun Jeong e Bun Yeoul Lee. "Preparation of Pyridylamido Hafnium Complexes for Coordinative Chain Transfer Polymerization". Polymers 12, n. 5 (11 maggio 2020): 1100. http://dx.doi.org/10.3390/polym12051100.

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The pyridylamido hafnium complex (I) discovered at Dow is a flagship catalyst among postmetallocenes, which are used in the polyolefin industry for PO-chain growth from a chain transfer agent, dialkylzinc. In the present work, with the aim to block a possible deactivation process in prototype compound I, the corresponding derivatives were prepared. A series of pyridylamido Hf complexes were prepared by replacing the 2,6-diisopropylphenylamido part in I with various 2,6-R2C6H3N-moieties (R = cycloheptyl, cyclohexyl, cyclopentyl, 3-pentyl, ethyl, or Ph) or by replacing 2-iPrC6H4C(H)- in I with the simple PhC(H)-moiety. The isopropyl substituent in the 2-iPrC6H4C(H)-moiety influences not only the geometry of the structures (revealed by X-ray crystallography), but also catalytic performance. In the complexes bearing the 2-iPrC6H4C(H)-moiety, the chelation framework forms a plane; however, this framework is distorted in the complexes containing the PhC(H)-moiety. The ability to incorporate α-olefin decreased upon replacing 2-iPrC6H4C(H)-with the PhC(H)-moiety. The complexes carrying the 2,6-di(cycloheptyl)phenylamido or 2,6-di(cyclohexyl)phenylamido moiety (replacing the 2,6-diisopropylphenylamido part in I) showed somewhat higher activity with greater longevity than did prototype catalyst I.

10

Wang, Feng, Heng Liu, YanMing Hu e XueQuan Zhang. "Lanthanide complexes mediated coordinative chain transfer polymerization of conjugated dienes". Science China Technological Sciences 61, n. 9 (31 luglio 2018): 1286–94. http://dx.doi.org/10.1007/s11431-018-9256-6.

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11

Göttker‐Schnetmann, Inigo, Philip Kenyon e Stefan Mecking. "Coordinative Chain Transfer Polymerization of Butadiene with Functionalized Aluminum Reagents". Angewandte Chemie International Edition 58, n. 49 (2 dicembre 2019): 17777–81. http://dx.doi.org/10.1002/anie.201909843.

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12

Göttker‐Schnetmann, Inigo, Philip Kenyon e Stefan Mecking. "Coordinative Chain Transfer Polymerization of Butadiene with Functionalized Aluminum Reagents". Angewandte Chemie 131, n. 49 (24 ottobre 2019): 17941–45. http://dx.doi.org/10.1002/ange.201909843.

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13

Savic, Ivan, Goran Nikolic, Ivana Savic e Milorad Cakic. "The application of HP-GFC chromatographic method for the analysis of oligosaccharides in bioactive complexes". Chemical Industry 63, n. 5 (2009): 415–26. http://dx.doi.org/10.2298/hemind0905415s.

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Abstract (sommario):

The aim of this work was to optimize a GFC method for the analysis of bioactive metal (Cu, Co and Fe) complexes with olygosaccharides (dextran and pullulan). Bioactive metal complexes with olygosaccharides were synthesized by original procedure. GFC was used to study the molecular weight distribution, polymerization degree of oligosaccharides and bioactive metal complexes. The metal bounding in complexes depends on the ligand polymerization degree and the presence of OH groups in coordinative sphere of the central metal ion. The interaction between oligosaccharide and metal ions are very important in veterinary medicine, agriculture, pharmacy and medicine.

14

Ubaldo-Alarcón, Andrés, Florentino Soriano-Corral, Teresa Córdova, Iván Zapata-González e Ramón Díaz-de-León. "Terpene Coordinative Chain Transfer Polymerization: Understanding the Process through Kinetic Modeling". Polymers 14, n. 12 (10 giugno 2022): 2352. http://dx.doi.org/10.3390/polym14122352.

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The interest in the Coordinative Chain Transfer Polymerization (CCTP) of a family of naturally occurring hydrocarbon monomers, namely terpenes, for the production of high-performance rubbers is increasing year by year. In this work, the synthesis of poly(β-myrcene) via CCTP is introduced, using neodymium versatate (NdV3), diisobutylaluminum hydrade (DIBAH) as the catalytic system and dimethyldichlorosilane (Me2SiCl2) as the activator. A bimodal distribution in the GPC signal reveals the presence of two populations at low conversions, attributable to dormants (arising from reversible chain transfer reactions) and dead chains (arising from termination and irreversible chain transfer reactions); a unimodal distribution is generated at medium and high conversions, corresponding to the dominant species, the dormant chains. Additionally, a mathematical kinetic model was developed based on the Method of Moments to study a set of selected experiments: ([β-myrcene]0:[NdV3]0:[DIBAH]0:[Me2SiCl2]0 = 660:1:2:1, 885:1:2:1, and 533:1:2:1). In order to estimate the kinetic rate constant of the systems, a minimization of the sum of squared errors (SSE) between the model predicted values and the experimental measurements was carried out, resulting in an excellent fit. A set of the Arrhenius parameters were estimated for the ratio [β-myrcene]0:[NdV3]0:[DIBAH]0:[Me2SiCl2]0 = 660:1:2:1 in a temperature range between 50 to 70 °C. While the end-group functionality (EGF) was predominantly preserved as the ratio [β-myrcene]0:[NdV3]0 was decreased, higher catalytic activity was obtained with a high ratio.

15

Lee, Hyun Ju, Jun Won Baek, Tae Jin Kim, Hee Soo Park, Seung Hyun Moon, Kyung Lee Park, Sung Moon Bae, Jinil Park e Bun Yeoul Lee. "Synthesis of Long-Chain Branched Polyolefins by Coordinative Chain Transfer Polymerization". Macromolecules 52, n. 23 (26 novembre 2019): 9311–20. http://dx.doi.org/10.1021/acs.macromol.9b01705.

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16

Isnard, Florence, Marina Lamberti, Luana Lettieri, Ilaria D'auria, Konstantin Press, Rubina Troiano e Mina Mazzeo. "Bimetallic salen aluminum complexes: cooperation between reactive centers in the ring-opening polymerization of lactides and epoxides". Dalton Transactions 45, n. 40 (2016): 16001–10. http://dx.doi.org/10.1039/c6dt02592g.

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17

Ding, Aiwu, Liang Fang, Chunyu Zhang, Heng Liu, Xuequan Zhang e Jianhe Liao. "Neodymium-Mediated Coordinative Chain Transfer Polymerization of Isoprene in the Presence of External Donors". Molecules 28, n. 21 (31 ottobre 2023): 7364. http://dx.doi.org/10.3390/molecules28217364.

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Abstract (sommario):

Nd-based polydiene elastomers, including NdIR and NdBR, are regarded as indispensable key raw materials in preparing green tires with excellent performance capabilities, but their wide application is still limited by the relative higher cost of Nd precatalysts. Nd-mediated coordinative chain transfer polymerization (CCTP) of diene provides an effective strategy to reduce the precatalyst cost, because this method involves very high atom economy, i.e., each Nd molecule can generate multiple polymer chains. Nevertheless, all possible factors that could influence such CCTP behaviors are still mostly unexplored to date. In this report, the basic chemistry on the influence of external donors on the overall CCTP behaviors of isoprene was established for the first time. It was found that increasing the amount of external donors had a negative influence on the chain transfer efficiencies, resulting in gradually decreasing atom economies. Catalyst addition order studies revealed that the coordination of donors with cationic Nd active species, rather than alkylaluminium CTAs, contributed mostly to such decreased efficiencies. Moreover, it was found that when the ratio of donors and Nd compounds was higher than 1.0, the CCTP behaviors were corrupted, resulting in polymers with broad distributions, as well as resulting in low atom economies; nevertheless, when the ratio was lower than 0.5, the system still displayed CCTP characteristics, implying that the critical ratio for maintaining the CCTP was 0.5. Additionally, when such a ratio was 0.01, the high atom economy was almost the same as donor-free CCTP systems. Detailed kinetic studies at such a ratio demonstrated that the donor-contained system proceeded in a well-controlled manner, as concluded from the good linear relationship between the Mn of the PIps against the polymer yields, as well as the good linearity between the Mn against the (IP)/(Nd) ratios. Such maintained CCTP properties also allowed for seeding two-step polymerizations to prepare diblock copolymers with precisely controlled molecular weights. Expanding the types of donors to more phosphine, oxygen, and nitrogen containing compounds showed that they also affected the CCTP behaviors depending on their steric and electronic properties.

18

Wang, Feng, Bo Dong, Heng Liu, Jun Guo, Wenjie Zheng, Chunyu Zhang, Liping Zhao, Chenxi Bai, Yanming Hu e Xuequan Zhang. "Synthesis of Block Copolymers Containing Polybutadiene Segments by Combination of Coordinative Chain Transfer Polymerization, Ring-Opening Polymerization, and Atom Transfer Radical Polymerization". Macromolecular Chemistry and Physics 216, n. 3 (29 novembre 2014): 321–28. http://dx.doi.org/10.1002/macp.201400465.

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19

Hustad, Phillip D., Roger L. Kuhlman, Daniel J. Arriola, Edmund M. Carnahan e Timothy T. Wenzel. "Continuous Production of Ethylene-Based Diblock Copolymers Using Coordinative Chain Transfer Polymerization". Macromolecules 40, n. 20 (ottobre 2007): 7061–64. http://dx.doi.org/10.1021/ma0717791.

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20

Tang, Zhengwei, Aimin Liang, Handong Liang, Jiangwei Zhao, Lin Xu e Jie Zhang. "Reversible Coordinative Chain Transfer Polymerization of Butadiene Using a Neodymium Phosphonate Catalyst". Macromolecular Research 27, n. 8 (30 marzo 2019): 789–94. http://dx.doi.org/10.1007/s13233-019-7105-5.

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21

Zinck, Philippe. "Tuning polyolefins and polydienes microstructure and architecture via coordinative chain transfer polymerization". Polymer International 61, n. 1 (3 ottobre 2011): 2–5. http://dx.doi.org/10.1002/pi.3175.

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22

Becker, Hinnerk Gordon. "Microstructural Polymer Design through Coordinative Polymerization of Semi-Crystalline Poly-1-Olefins". Macromolecular Symposia 275-276, n. 1 (gennaio 2009): 158–65. http://dx.doi.org/10.1002/masy.200950118.

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23

Nzahou Ottou, Winnie, Sébastien Norsic, Islem Belaid, Christophe Boisson e Franck D’Agosto. "Amino End-Functionalized Polyethylenes and Corresponding Telechelics by Coordinative Chain Transfer Polymerization". Macromolecules 50, n. 21 (17 ottobre 2017): 8372–77. http://dx.doi.org/10.1021/acs.macromol.7b01396.

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24

Amodio, Alessia, Giorgia Zanchin, Fabio De Stefano, Alessandro Piovano, Benedetta Palucci, Virginia Guiotto, Rocco Di Girolamo, Giuseppe Leone e Elena Groppo. "Cr(III) Complexes Bearing a β-Ketoimine Ligand for Olefin Polymerization: Are There Differences between Coordinative and Covalent Bonding?" Catalysts 12, n. 2 (19 gennaio 2022): 119. http://dx.doi.org/10.3390/catal12020119.

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Abstract (sommario):

β-ketoimines are extensively applied for the synthesis of organometallic complexes intended as (pre)catalysts for a variety of chemical transformations. We were interested in the synthesis of two Cr complexes bearing a simple bidentate β-ketoimine (L), with different ligand binding modes, as well as their application as a precatalyst in the polymerization of olefins. Complex 1 (L2CrCl3) was obtained by direct reaction of L with CrCl3(THF)3, while, for the synthesis of complex 2 (LCrCl2), the ligand was first deprotonated with nBuLi, giving the β-ketoiminato ligand L─Li+, and then reacted with CrCl3(THF)3. Characterization of the complexes proved that the Cr(III) ion is coordinatively bonded to L in 1, while it is covalently bonded to L in 2. The complexes were then used as precatalysts for the polymerization of ethylene and various cyclic olefins. Upon activation with methylaluminoxane, both the complexes exhibited poor activity in the polymerization of ethylene, whilst they exhibit good productivity in the polymerization of cyclic olefins, affording semicrystalline oligomers, without a significant difference between 1 and 2. To gain more insight, we investigated the reaction of the complexes with the Al-cocatalyst by IR and UV-Vis spectroscopies. The results proved that, in case of 1, the Al-activator deprotonates the ligand, bringing to the formation of an active species analogous to that of 2.

25

Wei, Jia, Wonseok Hwang, Wei Zhang e Lawrence R. Sita. "Dinuclear Bis-Propagators for the Stereoselective Living Coordinative Chain Transfer Polymerization of Propene". Journal of the American Chemical Society 135, n. 6 (29 gennaio 2013): 2132–35. http://dx.doi.org/10.1021/ja312463f.

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26

Sarazin, Yann, Thomas Chenal, André Mortreux, Hervé Vezin e Jean-François Carpentier. "Binary cerium(IV) tert-butoxides-dialkylmagnesium systems: Radical versus coordinative polymerization of styrene". Journal of Molecular Catalysis A: Chemical 238, n. 1-2 (settembre 2005): 207–14. http://dx.doi.org/10.1016/j.molcata.2005.05.025.

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27

Flisak, Zygmunt. "Theoretical study of isomerism in phenoxyimine-based precursors of coordinative olefin polymerization catalysts". Journal of Molecular Catalysis A: Chemical 316, n. 1-2 (1 febbraio 2010): 83–89. http://dx.doi.org/10.1016/j.molcata.2009.10.003.

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28

Schmitz, Sebastian, Natalya V. Izarova, Claire Besson, Jan van Leusen, Paul Kögerler e Kirill Yu Monakhov. "Ion-Directed Coordinative Polymerization of Copper(II) Pyridyl-Alcohol Complexes Through Thiane Functionalities". Zeitschrift für anorganische und allgemeine Chemie 645, n. 4 (15 gennaio 2019): 409–15. http://dx.doi.org/10.1002/zaac.201800469.

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29

Córdova, Teresa, Francisco Javier Enríquez-Medrano, Eduardo Martínez Cartagena, Arnulfo Banda Villanueva, Luis Valencia, Edgar Nazareo Cabrera Álvarez, Ricardo López González e Ramón Díaz-de-León. "Coordinative Chain Transfer Polymerization of Sustainable Terpene Monomers Using a Neodymium-Based Catalyst System". Polymers 14, n. 14 (17 luglio 2022): 2907. http://dx.doi.org/10.3390/polym14142907.

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Abstract (sommario):

The present investigation involves the coordinative chain transfer polymerization (CCTP) of biobased terpenes in order to obtain sustainable polymers from myrcene (My) and farnesene (Fa), using the ternary Ziegler–Natta catalyst system comprising [NdV3]/[Al(i-Bu)2H]/[Me2SiCl2] and Al(i-Bu)2H, which acts as cocatalyst and chain transfer agent (CTA). The polymers were produced with a yield above 85% according to the monomeric consumption at the end of the reaction, and the kinetic examination revealed that the catalyst system proceeded with a reversible chain transfer mechanism in the presence of 15–30 equiv. of CTA. The resulting polyterpenes showed narrow molecular weight distributions (Mw/Mn = 1.4–2.5) and a high percent of 1,4-cis microstructure in the presence of 1 equiv. of Me2SiCl2, having control of the molecular weight distribution in Ziegler–Natta catalytic systems that maintain a high generation of 1,4-cis microstructure.

30

Hashmi, Obaid H., Marc Visseaux e Yohan Champouret. "Evidence of coordinative chain transfer polymerization of isoprene using iron iminopyridine/ZnEt2 catalytic systems". Polymer Chemistry 12, n. 32 (2021): 4626–31. http://dx.doi.org/10.1039/d1py00433f.

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31

Flisak, Zygmunt, Grzegorz P. Spaleniak e Maria Bremmek. "Impact of Organoaluminum Compounds on Phenoxyimine Ligands in Coordinative Olefin Polymerization. A Theoretical Study". Organometallics 32, n. 14 (10 luglio 2013): 3870–76. http://dx.doi.org/10.1021/om4003347.

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32

Zinck, Philippe, Andreia Valente, Fanny Bonnet, Ana Violante, AndrÃ© Mortreux, Marc Visseaux, Simona Ilinca, Rob Duchateau e Pascal Roussel. "Reversible coordinative chain transfer polymerization of styrene by rare earth borohydrides, chlorides/dialkylmagnesium systems". Journal of Polymer Science Part A: Polymer Chemistry 48, n. 4 (15 febbraio 2010): 802–14. http://dx.doi.org/10.1002/pola.23828.

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33

Del Rio, E., G. Lligadas, J. C. Ronda, M. Galià e V. Cádiz. "Biobased polyurethanes from polyether polyols obtained by ionic-coordinative polymerization of epoxidized methyl oleate". Journal of Polymer Science Part A: Polymer Chemistry 48, n. 22 (23 settembre 2010): 5009–17. http://dx.doi.org/10.1002/pola.24296.

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34

Ronda, Joan Carles, Angels Serra e Virginia Cádiz. "Coordinative polymerization of p-substituted phenyl glycidyl ethers, 1. Effect of electron-donating groups". Macromolecular Chemistry and Physics 198, n. 9 (settembre 1997): 2917–34. http://dx.doi.org/10.1002/macp.1997.021980921.

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35

Ribeiro, Rodolfo, Rui Ruivo, Hajar Nsiri, Sébastien Norsic, Franck D’Agosto, Lionel Perrin e Christophe Boisson. "Deciphering the Mechanism of Coordinative Chain Transfer Polymerization of Ethylene Using Neodymocene Catalysts and Dialkylmagnesium". ACS Catalysis 6, n. 2 (6 gennaio 2016): 851–60. http://dx.doi.org/10.1021/acscatal.5b02316.

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36

Sarazin, Yann, Pierre de Frémont, Liana Annunziata, Michel Duc e Jean-François Carpentier. "Syndio- and Isoselective Coordinative Chain Transfer Polymerization of Styrene Promoted by ansa-Lanthanidocene/ Dialkylmagnesium Systems". Advanced Synthesis & Catalysis 353, n. 8 (maggio 2011): 1367–74. http://dx.doi.org/10.1002/adsc.201100059.

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37

Ronda, Joan Carles, Angels Serra e Virginia Cádiz. "Ring-opening polymerization of glycidylic compounds: influence of the glycidylic oxygen in the coordinative mechanism". Macromolecular Chemistry and Physics 200, n. 1 (1 gennaio 1999): 221–30. http://dx.doi.org/10.1002/(sici)1521-3935(19990101)200:1<221::aid-macp221>3.0.co;2-3.

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38

Wallace, Mark A., Aaron A. Burkey e Lawrence R. Sita. "Phenyl-Terminated Polyolefins via Living Coordinative Chain Transfer Polymerization with ZnPh2 as a Chain Transfer Agent". ACS Catalysis 11, n. 16 (2 agosto 2021): 10170–78. http://dx.doi.org/10.1021/acscatal.1c02038.

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39

Wallace, Mark A., e Lawrence R. Sita. "Multi-State Living Degenerative and Chain Transfer Coordinative Polymerization of α-Olefins via Sub-Stoichiometric Activation". ACS Catalysis 11, n. 15 (19 luglio 2021): 9754–60. http://dx.doi.org/10.1021/acscatal.1c02120.

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40

Wang, Feng, Chun-yu Zhang, Yan-ming Hu, Xiang-yu Jia, Chen-xi Bai e Xue-quan Zhang. "Reversible coordinative chain transfer polymerization of isoprene and copolymerization with ε-caprolactone by neodymium-based catalyst". Polymer 53, n. 26 (dicembre 2012): 6027–32. http://dx.doi.org/10.1016/j.polymer.2012.10.044.

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41

Cueny, Eric S., Lawrence R. Sita e Clark R. Landis. "Quantitative Validation of the Living Coordinative Chain-Transfer Polymerization of 1-Hexene Using Chromophore Quench Labeling". Macromolecules 53, n. 14 (15 luglio 2020): 5816–25. http://dx.doi.org/10.1021/acs.macromol.0c00552.

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42

Minyaev, Mikhail E., Pavel D. Komarov, Dmitrii M. Roitershtein, Konstantin A. Lyssenko, Ilya E. Nifant’ev, Lada N. Puntus, Evgenia A. Varaksina, Roman S. Borisov, Viktor P. Dyadchenko e Pavel V. Ivchenko. "Aryloxy Alkyl Magnesium versus Dialkyl Magnesium in the Lanthanidocene-Catalyzed Coordinative Chain Transfer Polymerization of Ethylene". Organometallics 38, n. 15 (18 luglio 2019): 2892–901. http://dx.doi.org/10.1021/acs.organomet.9b00243.

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43

Flisak, Zygmunt, Grzegorz P. Spaleniak e Maria Bremmek. "Correction to Impact of Organoaluminum Compounds on Phenoxyimine Ligands in Coordinative Olefin Polymerization. A Theoretical Study". Organometallics 32, n. 16 (6 agosto 2013): 4712. http://dx.doi.org/10.1021/om400754g.

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44

Lee, Kwanpyo, Myunghyun Paik Suh e Junghun Suh. "Equilibrium constant for coordinative polymerization of ano,o?-dihydroxyazobenzene derivative with Ni(II) ion in water". Journal of Polymer Science Part A: Polymer Chemistry 35, n. 9 (15 luglio 1997): 1825–30. http://dx.doi.org/10.1002/(sici)1099-0518(19970715)35:9<1825::aid-pola23>3.0.co;2-6.

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45

Fan, Changliang, Chenxi Bai, Hongguang Cai, Quanquan Dai, Xuequan Zhang e Fosong Wang. "Preparation of high cis-1,4 polyisoprene with narrow molecular weight distribution via coordinative chain transfer polymerization". Journal of Polymer Science Part A: Polymer Chemistry 48, n. 21 (7 settembre 2010): 4768–74. http://dx.doi.org/10.1002/pola.24268.

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46

Baek, Jun Won, Su Jin Kwon, Hyun Ju Lee, Tae Jin Kim, Ji Yeon Ryu, Junseong Lee, Eun Ji Shin, Ki Soo Lee e Bun Yeoul Lee. "Preparation of Half- and Post-Metallocene Hafnium Complexes with Tetrahydroquinoline and Tetrahydrophenanthroline Frameworks for Olefin Polymerization". Polymers 11, n. 7 (27 giugno 2019): 1093. http://dx.doi.org/10.3390/polym11071093.

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Abstract (sommario):

Hafnium complexes have drawn attention for their application as post-metallocene catalysts with unique performance in olefin polymerization. In this work, a series of half-metallocene HfMe2 complexes, bearing a tetrahydroquinoline framework, as well as a series of [Namido,N,Caryl]HfMe2-type post-metallocene complexes, bearing a tetrahydrophenanthroline framework, were prepared; the structures of the prepared Hf complexes were unambiguously confirmed by X-ray crystallography. When the prepared complexes were reacted with anhydrous [(C18H37)2N(H)Me]+[B(C6F5)4]−, desired ion-pair complexes, in which (C18H37)2NMe coordinated to the Hf center, were cleanly afforded. The activated complexes generated from the half-metallocene complexes were inactive for the copolymerization of ethylene/propylene, while those generated from post-metallocene complexes were active. Complex bearing bulky isopropyl substituents (12) exhibited the highest activity. However, the activity was approximately half that of the prototype pyridylamido-Hf Dow catalyst. The comonomer incorporation capability was also inferior to that of the pyridylamido-Hf Dow catalyst. However, 12 performed well in the coordinative chain transfer polymerization performed in the presence of (octyl)2Zn, converting all the fed (octyl)2Zn to (polyolefinyl)2Zn with controlled lengths of the polyolefinyl chain.

47

Fu, Wuchang, Xiaoqiang Xu e Hongwu Wu. "Mechanical and biodegradable properties of l-lactide-grafted sisal fiber reinforced polylactide composites". Journal of Reinforced Plastics and Composites 33, n. 22 (29 settembre 2014): 2034–45. http://dx.doi.org/10.1177/0731684414552684.

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Abstract (sommario):

Sisal fiber (SF) was grafted with low polymerization degree polylactide (PLA) according to the principle of coordinative ring-opening polymerization of lactide, and then the lactide-grafted sisal fiber (SF-g-LA) was mixed with PLA to make PLA/SF-g-LA composites. The mechanical properties, morphology, and biodegradability of PLA/SF-g-LA composites were systematically investigated, comparing with untreated SF reinforced PLA (PLA/USF) and alkali-treated SF reinforced PLA (PLA/ASF) composites. Results showed that the interfacial properties between SF-g-LA and PLA matrix showed dramatic improvement. The PLA/SF-g-LA composites exhibited noticeably superior tensile and flexural properties; however, their impact strength decreased slightly compared with pure PLA. All of the composites were buried in soil and different degrees of degradation were achieved. Because of better interfacial adhesion between SF-g-LA and PLA matrix, the degradation rate of PLA/SF-g-LA composite was lower than those of PLA/USF and PLA/ASF composites, although still higher than that of pure PLA. The biodegradation of PLA/SF-g-LA composites was marked by appearance of cavities, the exfoliation of fragmental materials, and the degradation of cellulose fibrils.

48

Kim, Tae Jin, Jun Won Baek, Seung Hyun Moon, Hyun Ju Lee, Kyung Lee Park, Sung Moon Bae, Jong Chul Lee, Pyung Cheon Lee e Bun Yeoul Lee. "Polystyrene Chain Growth Initiated from Dialkylzinc for Synthesis of Polyolefin-Polystyrene Block Copolymers". Polymers 12, n. 3 (2 marzo 2020): 537. http://dx.doi.org/10.3390/polym12030537.

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Abstract (sommario):

Polyolefins (POs) are the most abundant polymers. However, synthesis of PO-based block copolymers has only rarely been achieved. We aimed to synthesize various PO-based block copolymers by coordinative chain transfer polymerization (CCTP) followed by anionic polymerization in one-pot via conversion of the CCTP product (polyolefinyl)2Zn to polyolefinyl-Li. The addition of 2 equiv t-BuLi to (1-octyl)2Zn (a model compound of (polyolefinyl)2Zn) and selective removal or decomposition of (tBu)2Zn by evacuation or heating at 130 °C afforded 1-octyl-Li. Attempts to convert (polyolefinyl)2Zn to polyolefinyl-Li were unsuccessful. However, polystyrene (PS) chains were efficiently grown from (polyolefinyl)2Zn; the addition of styrene monomers after treatment with t-BuLi and pentamethyldiethylenetriamine (PMDTA) in the presence of residual olefin monomers afforded PO-block-PSs. Organolithium species that might be generated in the pot of t-BuLi, PMDTA, and olefin monomers, i.e., [Me2NCH2CH2N(Me)CH2CH2N(Me)CH2Li, Me2NCH2CH2N(Me)Li·(PMDTA), pentylallyl-Li⋅(PMDTA)], as well as PhLi⋅(PMDTA), were screened as initiators to grow PS chains from (1-hexyl)2Zn, as well as from (polyolefinyl)2Zn. Pentylallyl-Li⋅(PMDTA) was the best initiator. The Mn values increased substantially after the styrene polymerization with some generation of homo-PSs (27–29%). The Mn values of the extracted homo-PS suggested that PS chains were grown mainly from polyolefinyl groups in [(polyolefinyl)2(pentylallyl)Zn]−[Li⋅(PMDTA)]+ formed by pentylallyl-Li⋅(PMDTA) acting onto (polyolefinyl)2Zn.

49

Fritz, H. P., J. Blümel e D. Dengler. "Diphenylphosphin-substituiertes, chirales Polyepichlorhydrin, ein Träger für die heterogene, asymmetrische Katalyse / Diphenylphosphine-Substituted, Chiral Polyepichlorohydrin, a Support for the Heterogeneous, Asymmetric Catalysis". Zeitschrift für Naturforschung B 48, n. 11 (1 novembre 1993): 1589–94. http://dx.doi.org/10.1515/znb-1993-1118.

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Chiral polyepichlorohydrin was obtained as a crystalline, optically active powder by coordinative polymerization of S(+)-epichlorohydrin. Subsequent reaction with lithium diphenylphosphide in THF resulted in substitution of about 90% of the chlorine atoms by the P(C6H5)2 group to give an insoluble polymer, which was characterized by elemental analysis, 31P CP MAS NMR, and IR spectroscopy. On addition of solutions of bis(1.5-cyclooctadiene)-rhodium tetrafluoroborate to the polymer “heterogenization” of the complex occurred. The reason for the as yet short operational life time during the hydrogenation of α-acetamido cinnamic acid is the leaching of the metal complex moiety. The rhodium atom is coordinated to only one phosphorus atom of the polymer in the side group and rather weakly to one oxygen atom of the polymer chain.

50

Zhou, Guangli, Xiaohui Kang, Xingbao Wang, Zhaomin Hou e Yi Luo. "Theoretical Investigations of Isoprene Polymerization Catalyzed by Cationic Half-Sandwich Scandium Complexes Bearing a Coordinative Side Arm". Organometallics 37, n. 4 (2 febbraio 2018): 551–58. http://dx.doi.org/10.1021/acs.organomet.7b00876.

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