1
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Lu K, Shen X, Shi Y, He Z, Zhang D, Zhou M. Biodegradable polyester copolymers: synthesis based on the Biginelli reaction, characterization, and evaluation of their application properties. RSC Adv 2024; 14:17440-17447. [PMID: 38813120 PMCID: PMC11135155 DOI: 10.1039/d4ra02002b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2024] [Accepted: 05/11/2024] [Indexed: 05/31/2024] Open
Abstract
The Biginelli reaction, a three-component cyclocondensation reaction, is an important member of the multicomponent reaction (MCR) family. In this study, we conducted end-group modifications on a variety of biodegradable polyesters, including poly(1,4-butylene adipate) (PBA), poly(ε-caprolactone) (PCL), polylactic acid (PLA), and poly(p-dioxanone) (PPDO), based on the precursor polyethylene glycol (PEG). By combining two polymers through the Biginelli multi-component reaction, four new biodegradable polyester copolymers, namely DHPM-PBA, DHPM-PCL, DHPM-PLA, and DHPM-PPDO, were formed. These Biginelli reactions demonstrated exceptional completeness, validating the efficiency of the synthesis strategy. Although the introduction of various polyesters lead to different properties, such as crystallinity and cytotoxicity, the newly synthesized 3,4-dihydro-2(H)-pyrimidinone compounds (DHPMs) exhibit enhanced hydrophilicity and can self-assemble in water and N,N-dimethylformamide (DMF) solution to form micelles with a controllable size. Furthermore, DHPM-PPDO promotes cellular growth and has potential applications in wound healing and tissue engineering. In conclusion, this method demonstrates great universality and methodological significance and offers insights into the medical applications of polyethylene glycol.
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Affiliation(s)
- Kai Lu
- College of Materials Science and Engineering, Zhejiang University of Technology Hangzhou Zhejiang 310014 China
| | - Xinyi Shen
- College of Materials Science and Engineering, Zhejiang University of Technology Hangzhou Zhejiang 310014 China
| | - Yunhai Shi
- College of Materials Science and Engineering, Zhejiang University of Technology Hangzhou Zhejiang 310014 China
| | - Zejian He
- Stoddart Institute of Molecular Science, Department of Chemistry, Zhejiang University Hangzhou Zhejiang 310027 China
- ZJU-Hangzhou Global Scientific and Technological Innovation Center Hangzhou Zhejiang 311215 China
| | - Dahong Zhang
- Department of Urology, Zhejiang Provincial People's Hospital Hangzhou Zhejiang 310014 China
| | - Mi Zhou
- College of Materials Science and Engineering, Zhejiang University of Technology Hangzhou Zhejiang 310014 China
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2
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Karava V, Siamidi A, Vlachou M, Christodoulou E, Zamboulis A, Bikiaris DN, Kyritsis A, Klonos PA. Block copolymers based on poly(butylene adipate) and poly(L-lactic acid) for biomedical applications: synthesis, structure and thermodynamical studies. SOFT MATTER 2021; 17:2439-2453. [PMID: 33491719 DOI: 10.1039/d0sm02053b] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
This work describes the synthesis of poly(butylene adipate) (PBAd), by melt polycondensation, poly(l-lactic acid) (PLLA), by ring opening polymerization, and the new block copolymer PLLA/PBAd in ratios 90/10, 95/5, 75/25 and 50/50. Due to the biocompatibility and low toxicity of neat PBAd and PLLA, these copolymers are suitable to be used in biomedical applications. The 1H and 13C nuclear magnetic resonance spectroscopy techniques were employed for structural characterization. The thermal transitions, with an emphasis on crystallization, were assessed by differential scanning calorimetry, supplemented by X-ray diffraction and polarized optical microscopy. Molecular mobility studies were conducted using two advanced techniques, broadband dielectric spectroscopy and thermally stimulated depolarization currents. The results from the structural techniques, in combination with each other, provided proof of the presence of PLLA and PBAd blocks and, moreover, the successful copolymer synthesis. The overall data showed that the different co-polymer compositions result directly in severe changes in the polymer crystal distribution and, indirectly, the formation of PBAd micro/nano domains surrounded by PLLA. Furthermore, it was demonstrated that both the continuity of the two polymers throughout the copolymer volume and the semicrystalline morphology can be tuned to a wide extent. The latter makes these systems quite promising envisaging biomedical applications, including the encapsulation of small molecules, e.g. drug solutions. The molecular mobility map was constructed for these systems for the first time, revealing the local (short scale) and segmental (larger nm scale) mobility of PBAd and PLLA, as well as intermediate behaviors of the copolymers.
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Affiliation(s)
- Vasiliki Karava
- Department of Pharmacy, Section of Pharmaceutical Technology, National and Kapodistrian University of Athens, Zografou Campus, 15784, Athens, Greece.
| | - Aggeliki Siamidi
- Department of Pharmacy, Section of Pharmaceutical Technology, National and Kapodistrian University of Athens, Zografou Campus, 15784, Athens, Greece.
| | - Marilena Vlachou
- Department of Pharmacy, Section of Pharmaceutical Technology, National and Kapodistrian University of Athens, Zografou Campus, 15784, Athens, Greece.
| | - Evi Christodoulou
- Department of Chemistry, Laboratory of Polymer Chemistry and Technology, Aristotle University of Thessaloniki, GR-541 24, Thessaloniki, Greece
| | - Alexandra Zamboulis
- Department of Chemistry, Laboratory of Polymer Chemistry and Technology, Aristotle University of Thessaloniki, GR-541 24, Thessaloniki, Greece
| | - Dimitrios N Bikiaris
- Department of Chemistry, Laboratory of Polymer Chemistry and Technology, Aristotle University of Thessaloniki, GR-541 24, Thessaloniki, Greece
| | - Apostolos Kyritsis
- Department of Physics, National Technical University of Athens (NTUA), Zografou Campus, 15780, Athens, Greece.
| | - Panagiotis A Klonos
- Department of Chemistry, Laboratory of Polymer Chemistry and Technology, Aristotle University of Thessaloniki, GR-541 24, Thessaloniki, Greece and Department of Physics, National Technical University of Athens (NTUA), Zografou Campus, 15780, Athens, Greece.
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3
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Zahir L, Kida T, Tanaka R, Nakayama Y, Shiono T, Kawasaki N, Yamano N, Nakayama A. Synthesis of thermoplastic elastomers with high biodegradability in seawater. Polym Degrad Stab 2021. [DOI: 10.1016/j.polymdegradstab.2020.109467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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4
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Synthesis, Properties, and Biodegradability of Thermoplastic Elastomers Made from 2-Methyl-1,3-propanediol, Glutaric Acid and Lactide. Life (Basel) 2021; 11:life11010043. [PMID: 33445658 PMCID: PMC7828133 DOI: 10.3390/life11010043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 01/05/2021] [Accepted: 01/08/2021] [Indexed: 12/01/2022] Open
Abstract
An innovative type of biodegradable thermoplastic elastomers with improved mechanical properties from very common and potentially renewable sources, poly(L-lactide)-b-poly(2-methyl-1,3-propylene glutarate)-b-poly(L-lactide) (PLA-b-PMPG-b-PLA)s, has been developed for the first time. PLA-b-PMPG-b-PLAs were synthesized by polycondensation of 2-methyl-1,3-propanediol and glutaric acid and successive ring-opening polymerization of L-lactide, where PMPG is an amorphous central block with low glass transition temperature and PLA is hard semicrystalline terminal blocks. The copolymers showed glass transition temperature at lower than −40 °C and melting temperature at 130–152 °C. The tensile tests of these copolymers were also performed to evaluate their mechanical properties. The degradation of the copolymers and PMPG by enzymes proteinase K and lipase PS were investigated. Microbial biodegradation in seawater was also performed at 27 °C. The triblock copolymers and PMPG homopolymer were found to show 9–15% biodegradation within 28 days, representing their relatively high biodegradability in seawater. The macromolecular structure of the triblock copolymers of PLA and PMPG can be controlled to tune their mechanical and biodegradation properties, demonstrating their potential use in various applications.
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5
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Diaz C, Mehrkhodavandi P. Strategies for the synthesis of block copolymers with biodegradable polyester segments. Polym Chem 2021. [DOI: 10.1039/d0py01534b] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Oxygenated block copolymers with biodegradable polyester segments can be prepared in one-pot through sequential or simultaneous addition of monomers. This review highlights the state of the art in this area.
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Affiliation(s)
- Carlos Diaz
- University of British Columbia
- Department of Chemistry
- Vancouver
- Canada
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6
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Iuliano A, Nowacka M, Rybak K, Rzepna M. The effects of electron beam radiation on material properties and degradation of commercial PBAT/PLA blend. J Appl Polym Sci 2020. [DOI: 10.1002/app.48462] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- A. Iuliano
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3, 00‐664 Warsaw Poland
- Department of Chemistry, Faculty of Food SciencesWarsaw University of Life Sciences—SGGW Nowoursynowska 159c, 02‐776 Warsaw Poland
| | - M. Nowacka
- Department of Food Engineering and Process Management, Faculty of Food SciencesWarsaw University of Life Sciences—SGGW Nowoursynowska st. 159c, 02‐776 Warsaw Poland
| | - K. Rybak
- Department of Food Engineering and Process Management, Faculty of Food SciencesWarsaw University of Life Sciences—SGGW Nowoursynowska st. 159c, 02‐776 Warsaw Poland
| | - M. Rzepna
- Institute of Nuclear Chemistry and Technology Dorodna 16 Warsaw 03‐195 Poland
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7
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Jin C, Leng X, Zhang M, Wang Y, Wei Z, Li Y. Fully biobased biodegradable poly(
l
‐lactide)‐
b
‐poly(ethylene brassylate)‐
b
‐poly(
l
‐lactide) triblock copolymers: synthesis and investigation of relationship between crystallization morphology and thermal properties. POLYM INT 2020. [DOI: 10.1002/pi.5958] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Chenhao Jin
- State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory of Polymer Science and Engineering, Department of Polymer Science and Engineering, School of Chemical EngineeringDalian University of Technology Dalian China
| | - Xuefei Leng
- State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory of Polymer Science and Engineering, Department of Polymer Science and Engineering, School of Chemical EngineeringDalian University of Technology Dalian China
| | - Manwen Zhang
- State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory of Polymer Science and Engineering, Department of Polymer Science and Engineering, School of Chemical EngineeringDalian University of Technology Dalian China
| | - Yanshai Wang
- State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory of Polymer Science and Engineering, Department of Polymer Science and Engineering, School of Chemical EngineeringDalian University of Technology Dalian China
| | - Zhiyong Wei
- State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory of Polymer Science and Engineering, Department of Polymer Science and Engineering, School of Chemical EngineeringDalian University of Technology Dalian China
| | - Yang Li
- State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory of Polymer Science and Engineering, Department of Polymer Science and Engineering, School of Chemical EngineeringDalian University of Technology Dalian China
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8
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Isodimorphic aliphatic copolyester as midblock of poly(l-lactide)-based triblock copolymers towards largely enhanced impact toughness. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2018.12.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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9
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Imre B, García L, Puglia D, Vilaplana F. Reactive compatibilization of plant polysaccharides and biobased polymers: Review on current strategies, expectations and reality. Carbohydr Polym 2018; 209:20-37. [PMID: 30732800 DOI: 10.1016/j.carbpol.2018.12.082] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 11/27/2018] [Accepted: 12/24/2018] [Indexed: 10/27/2022]
Abstract
Our society is amidst a technological revolution towards a sustainable economy, focused on the development of biobased products in virtually all sectors. In this context, plant polysaccharides, as the most abundant macromolecules present in biomass represent a fundamental renewable resource for the replacement of fossil-based polymeric materials in commodity and engineering applications. However, native polysaccharides have several disadvantages compared to their synthetic counterparts, including reduced thermal stability, moisture absorption and limited mechanical performance, which hinder their direct application in native form in advanced material systems. Thus, polysaccharides are generally used in a derivatized form and/or in combination with other biobased polymers, requiring the compatibilization of such blends and composites. In this review we critically explore the current status and the future outlook of reactive compatibilization strategies of the most common plant polysaccharides in blends with biobased polymers. The chemical processes for the modification and compatibilization of starch and lignocellulosic based materials are discussed, together with the practical implementation of these reactive compatibilization strategies with special emphasis on reactive extrusion. The efficiency of these strategies is critically discussed in the context on the definition of blending and compatibilization from a polymer physics standpoint; this relies on the detailed evaluation of the chemical structure of the constituent plant polysaccharides and biobased polymers, the morphology of the heterogeneous polymeric blends, and their macroscopic behavior, in terms of rheological and mechanical properties.
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Affiliation(s)
- Balázs Imre
- Division of Glycoscience, Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, Stockholm, Sweden
| | - Lidia García
- Fundación Aitiip, Polígono Industrial Empresarium, C/Romero Nº 12, Zaragoza 50720, Spain; Tecnopackaging S.L., Polígono Industrial Empresarium, C/Romero Nº 12, Zaragoza 50720, Spain
| | - Debora Puglia
- Department of Civil and Environmental Engineering, University of Perugia, Terni, Italy
| | - Francisco Vilaplana
- Division of Glycoscience, Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, Stockholm, Sweden.
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10
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Feng P, Wu P, Gao C, Yang Y, Guo W, Yang W, Shuai C. A Multimaterial Scaffold With Tunable Properties: Toward Bone Tissue Repair. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2018; 5:1700817. [PMID: 29984132 PMCID: PMC6033191 DOI: 10.1002/advs.201700817] [Citation(s) in RCA: 155] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Revised: 02/23/2018] [Indexed: 05/25/2023]
Abstract
Polyetheretherketone (PEEK)/β-tricalcium phosphate (β-TCP) scaffolds are expected to be able to combine the excellent mechanical strength of PEEK and the good bioactivity and biodegradability of β-TCP. While PEEK acts as a closed membrane in which β-TCP is completely wrapped after the melting/solidifying processing, the PEEK membrane degrades very little, hence the scaffolds cannot display bioactivity and biodegradability. The strategy reported here is to blend a biodegradable polymer with PEEK and β-TCP to fabricate multi-material scaffolds via selective laser sintering (SLS). The biodegradable polymer first degrades and leaves caverns on the closed membrane, and then the wrapped β-TCP is exposed to body fluid. In this study, poly(l-lactide) (PLLA) is adopted as the biodegradable polymer. The results show that large numbers of caverns form on the membrane with the degradation of PLLA, enabling direct contact between β-TCP and body fluid, and allowing for their ion-exchange. As a consequence, the scaffolds display the bioactivity, biodegradability and cytocompatibility. Moreover, bone defect repair studies reveal that new bone tissues grow from the margin towards the center of the scaffolds from the histological analysis. The bone defect region is completely connected to the host bone end after 8 weeks of implantation.
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Affiliation(s)
- Pei Feng
- State Key Laboratory of High Performance Complex ManufacturingCollege of Mechanical and Electrical EngineeringCentral South UniversityChangsha410083China
| | - Ping Wu
- College of ChemistryXiangtan UniversityXiangtan411105China
| | - Chengde Gao
- State Key Laboratory of High Performance Complex ManufacturingCollege of Mechanical and Electrical EngineeringCentral South UniversityChangsha410083China
| | - Youwen Yang
- State Key Laboratory of High Performance Complex ManufacturingCollege of Mechanical and Electrical EngineeringCentral South UniversityChangsha410083China
| | - Wang Guo
- State Key Laboratory of High Performance Complex ManufacturingCollege of Mechanical and Electrical EngineeringCentral South UniversityChangsha410083China
| | - Wenjing Yang
- State Key Laboratory of High Performance Complex ManufacturingCollege of Mechanical and Electrical EngineeringCentral South UniversityChangsha410083China
| | - Cijun Shuai
- State Key Laboratory of High Performance Complex ManufacturingCollege of Mechanical and Electrical EngineeringCentral South UniversityChangsha410083China
- School of Energy and Machinery EngineeringJiangxi University of Science and TechnologyGanzhou341000China
- State Key Laboratory of High Performance Complex ManufacturingCentral South UniversityChangsha410083China
- Key Laboratory of Organ InjuryAging and Regenerative Medicine of Hunan ProvinceChangsha410008China
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11
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Daneshmand P, Jiménez-Santiago JL, Aragon--Alberti M, Schaper F. Catalytic-Site-Mediated Chain-End Control in the Polymerization of rac-Lactide with Copper Iminopyrrolide Complexes. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00196] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Pargol Daneshmand
- Centre in Green Chemistry and Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, Quebec H3T 3J7, Canada
| | - José L. Jiménez-Santiago
- Centre in Green Chemistry and Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, Quebec H3T 3J7, Canada
| | - Maxime Aragon--Alberti
- Centre in Green Chemistry and Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, Quebec H3T 3J7, Canada
| | - Frank Schaper
- Centre in Green Chemistry and Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, Quebec H3T 3J7, Canada
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12
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Daneshmand P, Fortun S, Schaper F. Diiminopyrrolide Copper Complexes: Synthesis, Structures, and rac-Lactide Polymerization Activity. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00609] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Pargol Daneshmand
- Centre in Green Chemistry
and Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, Québec H3T 3J7, Canada
| | - Solène Fortun
- Centre in Green Chemistry
and Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, Québec H3T 3J7, Canada
| | - Frank Schaper
- Centre in Green Chemistry
and Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, Québec H3T 3J7, Canada
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13
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Kundys A, Plichta A, Florjańczyk Z, Zychewicz A, Lisowska P, Parzuchowski P, Wawrzyńska E. Multi-arm star polymers of lactide obtained in melt in the presence of hyperbranched oligoglycerols. POLYM INT 2016. [DOI: 10.1002/pi.5126] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Anna Kundys
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
- Department of Chemistry, Faculty of Food Sciences; Warsaw University of Life Sciences - SGGW; Nowoursynowska 159c 02-776 Warsaw Poland
| | - Andrzej Plichta
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Zbigniew Florjańczyk
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Agnieszka Zychewicz
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Paulina Lisowska
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Paweł Parzuchowski
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Edyta Wawrzyńska
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
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14
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Zhou C, Wei Z, Lei X, Li Y. Fully biobased thermoplastic elastomers: synthesis and characterization of poly(l-lactide)-b-polymyrcene-b-poly(l-lactide) triblock copolymers. RSC Adv 2016. [DOI: 10.1039/c6ra08689f] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Fully biobased thermoplastic elastomers poly(l-lactide)-b-polymyrcene-b-poly(l-lactide) triblock copolymers with PLLA as hard block and polymyrcene as soft block were synthesized and evaluated.
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Affiliation(s)
- Cheng Zhou
- State Key Laboratory of Fine Chemicals
- Department of Polymer Science and Materials
- School of Chemical Engineering
- Dalian University of Technology
- Dalian 116024
| | - Zhiyong Wei
- State Key Laboratory of Fine Chemicals
- Department of Polymer Science and Materials
- School of Chemical Engineering
- Dalian University of Technology
- Dalian 116024
| | - Xuefei Lei
- State Key Laboratory of Fine Chemicals
- Department of Polymer Science and Materials
- School of Chemical Engineering
- Dalian University of Technology
- Dalian 116024
| | - Yang Li
- State Key Laboratory of Fine Chemicals
- Department of Polymer Science and Materials
- School of Chemical Engineering
- Dalian University of Technology
- Dalian 116024
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15
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Daneshmand P, Schaper F. Exploring the reactivity of manganese(III) complexes with diphenolate-diamino ligands in rac-lactide polymerization. Dalton Trans 2015; 44:20449-58. [PMID: 26541417 DOI: 10.1039/c5dt03756e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Manganese(III) complexes of tetradentate diphenolate-diamino (NNOO(2-)) ligands were prepared from aerobic reaction of MnCl2 with the respective ligands in basic methanolic solution. Methoxide complexes (NNOO)Mn(OMe)(MeOH)0-1 were obtained for three ligands, while others only provided the respective chloride complexes (NNOO)Mn(Cl)(MeOH). Complexes were analyzed by X-ray diffraction studies and octahedral complexes showed evidence of Jahn-Teller distortions. Magnetic moments determined in MeOD were indicative of high-spin Mn(III)-d(4) complexes (μeff = 4.2-4.6μB). Methoxide complexes were active in the coordination-insertion polymerization of rac-lactide (130 °C, 0.33-1.0 mol% catalyst loading) to yield atactic polylactic acid with moderate molecular weight control. Polymerization activity was reduced, but not suppressed by the presence of protic impurities. Chloride complexes showed less activity and only in the presence of external alcohol, indicative of an activated-monomer mechanism.
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Affiliation(s)
- Pargol Daneshmand
- Centre in Green Chemistry and Catalysis, Department of chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, QC H3T 3J7, Canada.
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