1
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Effect of preparation conditions on the size of nanoparticles based on poly(D,L-lactide-co-glycolide) synthesized with bismuth subsalicylate. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129198] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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2
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Altay E, Jang YJ, Kua XQ, Hillmyer MA. Synthesis, Microstructure, and Properties of High-Molar-Mass Polyglycolide Copolymers with Isolated Methyl Defects. Biomacromolecules 2021; 22:2532-2543. [PMID: 33970613 DOI: 10.1021/acs.biomac.1c00269] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
An efficient, fast, and reliable method for the synthesis of high-molar-mass polyglycolide (PGA) in bulk using bismuth (III) subsalicylate through ring-opening transesterification polymerization is described. The difference between the crystallization (Tc ≈ 180 °C)/degradation (Td ≈ 245 °C) temperatures and the melting temperature (Tm ≈ 222 °C) significantly affects the ability to melt-process PGA homopolymer. To expand these windows, the effect of copolymer microstructure differences through incorporation of methyl groups in pairs using lactide or isolated using methyl glycolide (≤10% methyl) as comonomers on the thermal, mechanical, and barrier properties were studied. Structures of copolymers were characterized by nuclear magnetic resonance (1H and 13C NMR) spectroscopies. Films of copolymers were obtained, and the microstructural and physical properties were analyzed. PGA homopolymers exhibited an approximately 30 °C difference between Tm and Tc, which increased to 68 °C by incorporating up to 10% methyl groups in the chain while maintaining overall thermal stability. Oxygen and water vapor permeation values of solvent-cast nonoriented films of PGA homopolymers were found to be 4.6 cc·mil·m-2·d-1·atm-1 and 2.6 g·mil·m-2·d-1·atm-1, respectively. Different methyl distributions in the copolymer sequence, provided through either lactide or methyl glycolide, affected the resulting gas barrier properties. At 10% methyl insertion, using lactide as a comonomer significantly increased both O2 (32 cc·mil·m-2·d-1·atm-1) and water vapor (12 g·mil·m-2·d-1·atm-1) permeation. However, when methyl glycolide was utilized for methyl insertion at 10% Me content, excellent barrier properties for both O2 (2.9 cc·mil·m-2·d-1·atm-1) and water vapor (1.0 g·mil·m-2·d-1·atm-1) were achieved.
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Affiliation(s)
- Esra Altay
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455-0431, United States
| | - Yoon-Jung Jang
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455-0431, United States
| | - Xiang Qi Kua
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455-0431, United States
| | - Marc A Hillmyer
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455-0431, United States
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3
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Kricheldorf HR, Weidner SM. ROP
of
L‐lactide
and
ε‐caprolactone
catalyzed by tin(
ii
) and tin(
iv
) acetates–switching from
COOH
terminated linear chains to cycles. JOURNAL OF POLYMER SCIENCE 2021. [DOI: 10.1002/pol.20200866] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Hans R. Kricheldorf
- Institut für Technische und Makromolekulare Chemie Bundestr Universität Hamburg Bundesstr. 45 20146 Hamburg Germany
| | - Steffen M. Weidner
- BAM Federal Institute of Materials Research and Testing Richard‐Willstätter‐Str. 11 12489 Berlin Germany
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4
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Ortiz-Aldaco MG, Báez JE, Jiménez-Halla JOC. Bismuth subsalicylate, a low-toxicity catalyst for the ring-opening polymerization (ROP) of l-lactide ( l-LA) with aliphatic diol initiators: synthesis, characterization, and mechanism of initiation. RSC Adv 2020; 10:30815-30824. [PMID: 35516064 PMCID: PMC9057703 DOI: 10.1039/d0ra05413e] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Accepted: 08/10/2020] [Indexed: 11/30/2022] Open
Abstract
The ring-opening polymerization (ROP) of l-lactide (l-LA) was induced by the catalytic action of bismuth subsalicylate (BiSS) using linear aliphatic diols [HO(CH2)nOH, where n = 2, 3, 4, 5, 6, and 8] as initiators and chain transfer agents. The theoretical and experimental degree of polymerization (DP) in all samples of α,ω-hydroxy telechelic poly(l-lactide) (HOPLLAOH) had a good agreement in all samples, an effect attributed to the interaction of BiSS with HO(CH2)nOH inducing a transfer reaction. HOPLLAOH was synthesized and characterized by a range of analytical techniques, confirming the insertion of methylene groups from the initiator into the main chain of the polyester. The glass-transition temperature (Tg) of HOPLLAOH was found to be proportional to the number of methylene groups present in the diol. Various parameters regarding the ROP of l-LA were studied, such as temperature, time of reaction, amount of catalyst, and the nature of the diols. A kinetic study of the reaction allowed the determination of the rate constants (k) and activation energy (Ea). A mechanism of initiation is proposed based on a computational study using density functional theory (DFT), evidencing the role of the alkyl diol as an initiator, producing an alkoxide (Bi–OROH). This species then acts as a nucleophile, attacking the carbonyl group, inducing its insertion, and ultimately completing the ring-opening of l-LA. Bismuth subsalicylate (BiSS) acted as a catalyst in the ring-opening polymerization of l-lactide (l-LA) in the presence of alkyl diols as initiators.![]()
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Affiliation(s)
| | - José E. Báez
- Department of Chemistry
- University of Guanajuato (UG)
- 36050 Guanajuato
- Mexico
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5
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Bouyahya A, Balieu S, Beniazza R, Raihane M, El Kadib A, Le Cerf D, Thébault P, Gouhier G, Lahcini M. Organotin-bridged ionic liquid as a solvent-free, leaching-resistive catalyst for ring opening polymerization of ε-caprolactone. NEW J CHEM 2019. [DOI: 10.1039/c8nj05985c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An easy synthesis provides a monoalkyltin trichloride grafted onto an ionic liquid. The catalyst paves the way to nontoxic biologically relevant materials.
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Affiliation(s)
| | | | | | - Mustapha Raihane
- Laboratoire de Chimie Organométallique et Macromoléculaire-Materiaux Composites (LCO2MC)
- Faculté des Sciences et Techniques Gueliz
- Université Cadi Ayyad
- 40000 Marrakech
- Morocco
| | - Abdelkrim El Kadib
- Euromed Research Center, Engineering Division
- Euro-Med University of Fes (UEMF)
- Fès
- Morocco
| | | | | | | | - Mohammed Lahcini
- Laboratoire de Chimie Organométallique et Macromoléculaire-Materiaux Composites (LCO2MC)
- Faculté des Sciences et Techniques Gueliz
- Université Cadi Ayyad
- 40000 Marrakech
- Morocco
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6
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Duval C, Rahouadj R, Nouvel C, Six JL. PLGA with less than 1 month of half-life time: Tensile properties in dry and wet states and hydrolytic degradation. INT J POLYM MATER PO 2017. [DOI: 10.1080/00914037.2017.1354197] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Charlotte Duval
- Laboratoire de Chimie Physique Macromoléculaire, Université de Lorraine, Nancy, France
- Laboratoire de Chimie Physique Macromoléculaire, CNRS, Nancy, France
| | - Rachid Rahouadj
- Laboratoire d’Energétique et de Mécanique Théorique Appliquée, CNRS-Lorraine University, ENSEM, Vandœuvre-lès-Nancy, France
| | - Cécile Nouvel
- Laboratoire de Chimie Physique Macromoléculaire, Université de Lorraine, Nancy, France
- Laboratoire de Chimie Physique Macromoléculaire, CNRS, Nancy, France
| | - Jean-Luc Six
- Laboratoire de Chimie Physique Macromoléculaire, Université de Lorraine, Nancy, France
- Laboratoire de Chimie Physique Macromoléculaire, CNRS, Nancy, France
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7
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Kricheldorf HR, Weidner SM, Scheliga F. Cyclic poly(l-lactide)s via ring-expansion polymerizations catalysed by 2,2-dibutyl-2-stanna-1,3-dithiolane. Polym Chem 2017. [DOI: 10.1039/c6py02166b] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
l-Lactide was polymerized in bulk at 120 or 160 °C with a cyclic dibutyltin catalyst derived from 1,2-dimercaptoethane.
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Affiliation(s)
- H. R. Kricheldorf
- Institut für Technische und Makromolekulare Chemie
- D-20146 Hamburg
- Germany
| | - S. M. Weidner
- BAM
- Federal Institute of Materials Research and Testing
- D-12489 Berlin
- Germany
| | - F. Scheliga
- Institut für Technische und Makromolekulare Chemie
- D-20146 Hamburg
- Germany
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8
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Fuoco T, Meduri A, Lamberti M, Pellecchia C, Pappalardo D. Copolymerization and terpolymerization of glycolide with lactones by dimethyl(salicylaldiminato)aluminum compounds. J Appl Polym Sci 2015. [DOI: 10.1002/app.42567] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Tiziana Fuoco
- Dipartimento di Chimica e Biologia; Università di Salerno; Fisciano Italy
| | - Angelo Meduri
- Dipartimento di Scienze e Tecnologie; Università del Sannio; Benevento Italy
| | - Marina Lamberti
- Dipartimento di Fisica “E. Caianiello”; Università di Salerno; Fisciano Italy
| | - Claudio Pellecchia
- Dipartimento di Chimica e Biologia; Università di Salerno; Fisciano Italy
| | - Daniela Pappalardo
- Dipartimento di Scienze e Tecnologie; Università del Sannio; Benevento Italy
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9
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Duval C, Nouvel C, Six JL. Is bismuth subsalicylate an effective nontoxic catalyst for plga synthesis? ACTA ACUST UNITED AC 2014. [DOI: 10.1002/pola.27096] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Charlotte Duval
- Université de Lorraine; Laboratoire de Chimie Physique Macromoléculaire LCPM; FRE 3564 Nancy F-54000 France
- CNRS; Laboratoire de Chimie Physique Macromoléculaire LCPM; FRE 3564 Nancy F-54000 France
| | - Cécile Nouvel
- Université de Lorraine; Laboratoire de Chimie Physique Macromoléculaire LCPM; FRE 3564 Nancy F-54000 France
- CNRS; Laboratoire de Chimie Physique Macromoléculaire LCPM; FRE 3564 Nancy F-54000 France
| | - Jean-Luc Six
- Université de Lorraine; Laboratoire de Chimie Physique Macromoléculaire LCPM; FRE 3564 Nancy F-54000 France
- CNRS; Laboratoire de Chimie Physique Macromoléculaire LCPM; FRE 3564 Nancy F-54000 France
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10
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Rizzarelli P, Carroccio S. Modern mass spectrometry in the characterization and degradation of biodegradable polymers. Anal Chim Acta 2014; 808:18-43. [DOI: 10.1016/j.aca.2013.11.001] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2013] [Revised: 10/18/2013] [Accepted: 11/04/2013] [Indexed: 01/06/2023]
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11
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Weidner SM, Scheliga F, Kricheldorf HR. Low-Temperature Polymerization of ε-Caprolactone Catalyzed by Cerium Triflates. MACROMOL CHEM PHYS 2013. [DOI: 10.1002/macp.201300279] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Steffen M. Weidner
- BAM - Federal Institute for Materials Research. and Testing; I-3 Structure Analysis, Richard-Willstätter Str. 11 D 12489 Berlin Germany
| | - Felix Scheliga
- Institut für Technische und Makromolekulare Chemie der Universität; Bundesstr. 45 D 20146 Hamburg Germany
| | - Hans R. Kricheldorf
- Institut für Technische und Makromolekulare Chemie der Universität; Bundesstr. 45 D 20146 Hamburg Germany
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12
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Nagahama K, Takahashi A, Ohya Y. Biodegradable polymers exhibiting temperature-responsive sol–gel transition as injectable biomedical materials. REACT FUNCT POLYM 2013. [DOI: 10.1016/j.reactfunctpolym.2012.11.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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13
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Hirata M, Masutani K, Kimura Y. Synthesis of ABCBA Penta Stereoblock Polylactide Copolymers by Two-Step Ring-Opening Polymerization of l- and d-Lactides with Poly(3-methyl-1,5-pentylene succinate) as Macroinitiator (C): Development of Flexible Stereocomplexed Polylactide Materials. Biomacromolecules 2013; 14:2154-61. [DOI: 10.1021/bm400228x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Masayuki Hirata
- Department of Biomolecular Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku,
Kyoto 606-8585, Japan
| | - Kazunari Masutani
- Department of Biomolecular Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku,
Kyoto 606-8585, Japan
| | - Yoshiharu Kimura
- Department of Biomolecular Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku,
Kyoto 606-8585, Japan
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14
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Fernández J, Meaurio E, Chaos A, Etxeberria A, Alonso-Varona A, Sarasua J. Synthesis and characterization of poly (l-lactide/ε-caprolactone) statistical copolymers with well resolved chain microstructures. POLYMER 2013. [DOI: 10.1016/j.polymer.2013.03.009] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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15
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Kricheldorf HR, Weidner SM, Scheliga F, Lahcini M. Poly(ϵ-caprolactone) by Combined Ring-Opening Polymerization and Polycondensation. MACROMOL CHEM PHYS 2012. [DOI: 10.1002/macp.201200061] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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16
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Lahcini M, Qayouh H, Yashiro T, Weidner SM, Kricheldorf HR. Bismuth-Triflate-Catalyzed Polymerizations of ε
-Caprolactone. MACROMOL CHEM PHYS 2011. [DOI: 10.1002/macp.201000517] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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17
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18
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Kricheldorf HR. Syntheses of Biodegradable and Biocompatible Polymers by Means of Bismuth Catalysts. Chem Rev 2009; 109:5579-94. [DOI: 10.1021/cr900029e] [Citation(s) in RCA: 93] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hans R. Kricheldorf
- Institut für Technische und Makromolekulare Chemie, Bundesstrasse 45, D-20146 Hamburg, Germany
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19
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Kricheldorf HR, Behnken G, Schwarz G, Simon P, Brinkmann M. High Molar Mass Poly(trimethylene carbonate) by Ph2BiOEt and Ph2BiBr-Initiated Ring-Opening Polymerizations. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2009. [DOI: 10.1080/10601320902724800] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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20
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Hu X, Chen X, Xie Z, Cheng H, Jing X. Aliphatic poly(ester‐carbonate)s bearing amino groups and its RGD peptide grafting. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/pola.23008] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Xiuli Hu
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
- Graduate School of Chinese Academy of Sciences, Beijing 100039, People's Republic of China
| | - Xuesi Chen
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
| | - Zhigang Xie
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
- Graduate School of Chinese Academy of Sciences, Beijing 100039, People's Republic of China
| | - Haibo Cheng
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
- Graduate School of Chinese Academy of Sciences, Beijing 100039, People's Republic of China
| | - Xiabin Jing
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
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21
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Kricheldorf HR, Behnken G, Schwarz G, Brockaert JA. High Molecular Weight Poly(ε-caprolactone) by Initiation with Triphenyl Bismuth. MACROMOL CHEM PHYS 2008. [DOI: 10.1002/macp.200800028] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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22
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Kricheldorf HR, Behnken G. Ph2BiOEt‐Initiated Copolymerizations of ϵ‐Caprolactone and Glycolide. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2008. [DOI: 10.1080/10601320802218861] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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23
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Kricheldorf HR, Behnken G, Schwarz G, Kopf J. High Molar Mass Poly(ε-caprolactone) by Means of Diphenyl Bismuth Ethoxide, a Highly Reactive Single Site Initiator. Macromolecules 2008. [DOI: 10.1021/ma071797i] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hans R. Kricheldorf
- Institut für Technische and Makromolekulare Chemie, Bundesstrasse 45, 20146 Hamburg, Germany, Institut für Anorganische Chemie, Martin-Luther-King Platz 6, 20146 Hamburg, Germany
| | - Gesa Behnken
- Institut für Technische and Makromolekulare Chemie, Bundesstrasse 45, 20146 Hamburg, Germany, Institut für Anorganische Chemie, Martin-Luther-King Platz 6, 20146 Hamburg, Germany
| | - Gert Schwarz
- Institut für Technische and Makromolekulare Chemie, Bundesstrasse 45, 20146 Hamburg, Germany, Institut für Anorganische Chemie, Martin-Luther-King Platz 6, 20146 Hamburg, Germany
| | - Juergen Kopf
- Institut für Technische and Makromolekulare Chemie, Bundesstrasse 45, 20146 Hamburg, Germany, Institut für Anorganische Chemie, Martin-Luther-King Platz 6, 20146 Hamburg, Germany
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24
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Buzin P, Schwarz G, Kricheldorf HR. Cationic polymerizations of 2-alkyloxazolines catalyzed by bismuth salts. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/pola.22811] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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25
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Kricheldorf HR, Behnken G. Copolymerizations of Glycolide andL‐Lactide Initiated with Bismuth(III)n‐Hexanoate or Bismuth Subsalicylate. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2007. [DOI: 10.1080/10601320701406997] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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26
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Kelch S, Steuer S, Schmidt AM, Lendlein A. Shape-Memory Polymer Networks from Oligo[(ε-hydroxycaproate)-co-glycolate]dimethacrylates and Butyl Acrylate with Adjustable Hydrolytic Degradation Rate. Biomacromolecules 2007; 8:1018-27. [PMID: 17305394 DOI: 10.1021/bm0610370] [Citation(s) in RCA: 112] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Degradable shape-memory polymer networks intended for biomedical applications were synthesized from oligo[(epsilon-hydroxycaproate)-co-glycolate]dimethacrylates with glycolate contents between 0 and 30 mol % using a photopolymerization process. In addition AB copolymer networks were prepared by adding 60 wt % n-butyl acrylate as comonomer. All synthesized polymer networks are semicrystalline at room temperature. A melting transition T(m) between 18 and 53 degrees C which can be used as switching transition for the shape-memory effect can be attributed to the crystalline poly(epsilon-hydroxycaproate) phase. At temperatures below T(m) the elastic properties are dominated by these physical cross-links. At temperatures higher than T(m) the E modulus of the amorphous polymer networks is lowered by up to 2 orders of magnitude, depending on the chemical cross-link density. Copolymer networks based on macrodimethacrylates with a M(n) of up to 13,500 g x mol(-1) and a maximum glycolate content of 21 mol % show quantitative strain recovery rates in stress-controlled cyclic thermomechanical experiments. Hydrolytic degradation experiments of polymer networks performed in phosphate buffer solution at 37 degrees C show that the degradation rate can be accelerated by increasing the glycolate content and decelerated by the incorporation of n-butyl acrylate.
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Affiliation(s)
- Steffen Kelch
- GKSS Research Center, Center for Biomaterial Development, Institute of Polymer Research, 14513 Teltow, Germany
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27
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Kricheldorf HR, Behnken G, Schwarz G. Ultra-high molecular weight poly(ɛ-caprolactone) by means of diphenyl bismuth bromide. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/pola.22429] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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28
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Lee J, Bae YH, Sohn YS, Jeong B. Thermogelling Aqueous Solutions of Alternating Multiblock Copolymers of Poly(l-lactic acid) and Poly(ethylene glycol). Biomacromolecules 2006; 7:1729-34. [PMID: 16768391 DOI: 10.1021/bm0600062] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We are reporting alternating multiblock copolymers of poly(L-lactic acid)/poly(ethylene glycol) aqueous solution (> 15 wt %) undergoing sol-gel-sol transition as the temperature increases from 20 to 60 degrees C. Micelles of the multiblock copolymers (in water) are about 20 nm in radius at low temperature. They are aggregated to a larger size as the temperature increases, which should play a critical role in the sol-to-gel transition. The transition temperature and gel window were affected by the molecular weight and composition of the multiblock copolymer. In particular, the aqueous solution of an alternating multiblock copolymer (Mn approximately 6700 daltons) prepared from poly(ethylene glycol) (Mn approximately 600 daltons) and poly(L-lactic acid) (Mn approximately 1300 daltons) showed a maximum modulus at body temperature (37 degrees C). The in situ gel forming ability of the polymer aqueous solution in vivo as well as in vitro indicates that it can be a promising injectable biomaterial.
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Affiliation(s)
- Jisun Lee
- Department of Chemistry, Division of Nano Sciences, Ewha Womans University, Daehyun-Dong, Seodaemun-Ku, Seoul, 120-750, Korea
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29
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Kricheldorf HR, Behnken G, Schwarz G. Ring-opening polymerization of ɛ-caprolactone via the bismuth-2-mercaptoethanol complex. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/pola.21415] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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30
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Kricheldorf HR, Behnken G, Schwarz G. Telechelic polyesters of ethane diol and adipic or sebacic acid by means of bismuth carboxylates as non-toxic catalysts. POLYMER 2005. [DOI: 10.1016/j.polymer.2005.10.025] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Zurita R, Puiggalí J, Franco L, Rodríguez-Galán A. Copolymerization of glycolide and trimethylene carbonate. ACTA ACUST UNITED AC 2005. [DOI: 10.1002/pola.21199] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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