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Sun H, Wang X, Chen Q, Wang Z. Nanostructures, Linear Rheological Responses, and Tunable Mechanical Properties of Microphase-Separated Cellulose- graft-Diblock Bottlebrush Copolymer Elastomers. Biomacromolecules 2023; 24:3647-3656. [PMID: 37462907 DOI: 10.1021/acs.biomac.3c00386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/15/2023]
Abstract
A series of cellulose-graft-diblock bottlebrush copolymer elastomers (cellulose-graft-poly(n-butyl acrylate)-block-poly(methyl methacrylate) (Cell-g-PBA-b-PMMA)) with short side chains were synthesized via successive atom transfer radical polymerization (ATRP) to study the influence of varying compositions and lengths of the graft diblock side chains on microphase morphologies and properties. The microphase-separated morphologies from misaligned spheres to cylinders were observed by atomic force microscopy (AFM) and small-angle X-ray scattering (SAXS) measurements. These bottlebrush copolymer elastomers possessed thermal stability and enhanced mechanical properties because the PMMA outer block could self-assemble into hard microdomains, which served as physical cross-links. The viscoelastic responses of these bottlebrush copolymers within the linear viscoelastic (LVE) regime were carried out by the oscillatory shear rheology. The time-temperature superposition (tTs) principle was applied to construct the master curves of the dynamic moduli, and the sequential relaxation of dense bottlebrush copolymers with different PMMA hard outer block lengths was analyzed. The rheological behaviors in this work could be utilized to build up the connection of microstructures and properties for the application of these bottlebrush copolymers as high-performance thermoplastic elastomers.
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Affiliation(s)
- Huanjuan Sun
- Key Laboratory of Precision and Intelligent Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Xuehui Wang
- Key Laboratory of Precision and Intelligent Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Quan Chen
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, P. R. China
| | - Zhigang Wang
- Key Laboratory of Precision and Intelligent Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
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Bichler KJ, Jakobi B, Honecker D, Stingaciu LR, Weldeghiorghis TK, Collins JHP, Schneider GJ. Dynamics of Bottlebrush Polymers in Solution by Neutron Spin Echo Spectroscopy. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c01177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Karin J. Bichler
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana70803, United States
| | - Bruno Jakobi
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana70803, United States
| | - Dirk Honecker
- ISIS Facility, Rutherford Appleton Laboratory, DidcotOX11 0QX, United Kingdom
| | - Laura R. Stingaciu
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee37831, United States
| | | | - James H. P. Collins
- National High Magnetic Field Laboratory and Biology and McKnight Brain Institute, University of Florida, Box 100015, Gainesville, Florida32610-0015, United States
| | - Gerald J. Schneider
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana70803, United States
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana70803, United States
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Zhang X, Wei W, Xiong H. Hierarchical Dynamics of Nonsticky Molecular Nanoparticle-Tethered Polymers: End and Topology Effects. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00232] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Xu X, Xu WS. Melt Properties and String Model Description of Glass Formation in Graft Polymers of Different Side-Chain Lengths. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00327] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Xiaolei Xu
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
| | - Wen-Sheng Xu
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
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Rheology of Poly(glycidyl methacrylate) Macromolecular Nano Assemblies. Polymers (Basel) 2022; 14:polym14030455. [PMID: 35160445 PMCID: PMC8839273 DOI: 10.3390/polym14030455] [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: 01/11/2022] [Revised: 01/19/2022] [Accepted: 01/20/2022] [Indexed: 12/04/2022] Open
Abstract
A recently reported combined polymerization process of glycidyl methacrylate, mediated by homometallic and heterobimetallic aluminium complexes, naturally produces nano-sized macromolecular assemblies. In this work, the morphological features and the rheological properties of these novel nanoassemblies are studied. The hydrodynamic sizes of the nanoparticles in the solution range from 10 to 40 nm (in numbers), but on a flat surface they adopt a characteristic thin disk shape. The dynamic moduli have been determined in a broad range of temperatures, and the time—temperature superposition applied to obtain master curves of the whole viscoelastic response from the glassy to the terminal regions. The fragility values obtained from the temperature dependence are of m ~40, typical of van de Waals liquids, suggesting a very effective packing of the macromolecular assemblies. The rheological master curves feature a characteristic viscoelastic relaxation with the absence of elastic intermediate plateau, indicating that the systems behaved as un-entangled polymers. The analysis of the linear viscoelastic fingerprint reveals a Zimm-like dynamics at intermediate frequencies typical of unentangled systems. This behaviour resembles that observed in highly functionalized stars, dendrimers, soft colloids and microgels.
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Bichler KJ, Jakobi B, Schneider GJ. Dynamics of bottlebrush polymers. EPJ WEB OF CONFERENCES 2022. [DOI: 10.1051/epjconf/202227201002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Bottlebrushes are an interesting class of polymers which shows intriguing material properties often associated with dynamics. While dynamical phenomena in linear polymers are well understood and existing theories can describe them in a good way, bottlebrush dynamics have only rarely been investigated. Therefore, we performed dielectric spectroscopy and quasi-elastic neutron scattering to study the dynamics of polydimethylsiloxane-based bottlebrush polymers, PDMS-g-PDMS focusing mostly on the segmental dynamics of the side chains. Comparing the relaxation times of the α – relaxation, tracked with dielectric spectroscopy, of bottlebrush polymers with those of their respective linear side chains show a slowing down once the side chains are attached to the backbone. This effect diminishes and finally vanishes with increasing side chain length. The time and length scale, offered by quasi-elastic neutron scattering, fits for the segmental dynamics together with faster processes. The Q-dependence of the segmental relaxation times allows to classify bottlebrush polymers as heterogenous including a non-Gaussian character. For such a dynamical system, the mean square displacement needs to be separated into single processes before an overall mean square displacement can be generated by applying the time temperature superposition principle.
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Mitsuzuka M, Kinbara Y, Fukuhara M, Nakahara M, Nakano T, Takarada J, Wang Z, Mori Y, Kageoka M, Tawa T, Kawamura S, Tajitsu Y. Relationship between Photoelasticity of Polyurethane and Dielectric Anisotropy of Diisocyanate, and Application of High-Photoelasticity Polyurethane to Tactile Sensor for Robot Hands. Polymers (Basel) 2020; 13:polym13010143. [PMID: 33396439 PMCID: PMC7795569 DOI: 10.3390/polym13010143] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2020] [Revised: 12/20/2020] [Accepted: 12/24/2020] [Indexed: 11/16/2022] Open
Abstract
Eight types of polyurethane were synthesized using seven types of diisocyanate. It was found that the elasto-optical constant depends on the concentration of diisocyanate groups in a unit volume of a polymer and the magnitude of anisotropy of the dielectric constant of diisocyanate groups. It was also found that incident light scattered when bending stress was generated inside photoelastic polyurethanes. A high sensitive tactile sensor for robot hands was devised using one of the developed polyurethanes with high photoelasticity.
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Affiliation(s)
- Masahiko Mitsuzuka
- Research Organization of Science and Technology, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan; (M.M.); (Z.W.)
| | - Yuho Kinbara
- Mitsui Chemicals, Inc., Tokyo 105-7122, Japan; (Y.K.); (M.N.); (T.N.); (M.K.); (T.T.)
| | - Mizuki Fukuhara
- Department of Robotics, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan; (M.F.); (Y.M.); (S.K.)
| | - Maki Nakahara
- Mitsui Chemicals, Inc., Tokyo 105-7122, Japan; (Y.K.); (M.N.); (T.N.); (M.K.); (T.T.)
| | - Takashi Nakano
- Mitsui Chemicals, Inc., Tokyo 105-7122, Japan; (Y.K.); (M.N.); (T.N.); (M.K.); (T.T.)
| | - Jun Takarada
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Suita, Osaka 564-8680, Japan;
| | - Zhongkui Wang
- Research Organization of Science and Technology, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan; (M.M.); (Z.W.)
| | - Yoshiki Mori
- Department of Robotics, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan; (M.F.); (Y.M.); (S.K.)
| | - Masakazu Kageoka
- Mitsui Chemicals, Inc., Tokyo 105-7122, Japan; (Y.K.); (M.N.); (T.N.); (M.K.); (T.T.)
| | - Tsutomu Tawa
- Mitsui Chemicals, Inc., Tokyo 105-7122, Japan; (Y.K.); (M.N.); (T.N.); (M.K.); (T.T.)
| | - Sadao Kawamura
- Department of Robotics, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan; (M.F.); (Y.M.); (S.K.)
| | - Yoshiro Tajitsu
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Suita, Osaka 564-8680, Japan;
- Correspondence: ; Tel.: +81-6-6368-1121
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