1
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Pipertzis A, Ntetsikas K, Hadjichristidis N, Floudas G. Cyclic Topologies in Linear α,ω-Dihydroxy Polyisoprenes by Dielectric Spectroscopy. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c01527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Achilleas Pipertzis
- Department of Physics, University of Ioannina, P.O. Box 1186, Ioannina 451 10, Greece
| | - Konstantinos Ntetsikas
- Polymer Synthesis Laboratory, KAUST Catalysis Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia
| | - Nikos Hadjichristidis
- Polymer Synthesis Laboratory, KAUST Catalysis Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia
| | - George Floudas
- Department of Physics, University of Ioannina, P.O. Box 1186, Ioannina 451 10, Greece
- University Research Center of Ioannina (URCI)─Institute of Materials Science and Computing, 451 10 Ioannina, Greece
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2
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Kim S, Lee WB, de Souza NR, Choi SH. QENS study on local segmental dynamics of polyelectrolytes in complex coacervates. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.125525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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3
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Liu Y, Shi G, Wu G. Mediating the slow dynamics of polyacrylates by small molecule-bridged hydrogen bonds. SOFT MATTER 2022; 18:4445-4454. [PMID: 35648624 DOI: 10.1039/d2sm00453d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
This report studied the changes in the slow dynamics of polyacrylate by adding a hindered phenol (CA) capable of forming three intermolecular hydrogen bonds (inter-HBs) per molecule with the polymer chain. The CA molecule apparently diminishes the slow modes (with lower peak temperatures and peak heights) of the polyacrylate, although it has a higher glass transition temperature (Tg) than the acrylic matrix, and the rigid CA-bridged HB network significantly amplifies the α-relaxation near Tg (with higher peak temperatures and peak heights). Consequently, the mixtures exhibit a diminishing slow mode that gradually merges with the prominent α-peak with increasing CA loadings. The anomalous dynamics concerning the opposite behaviors of the slow mode and α-relaxation was further rationalized in terms of dissociation of inter-HBs when the temperature is higher than Tg, together with the small molecule-alleviated macromolecular connectivity. This work provides essential insights into the slow dynamics of such HB-driven hybrids, and paves the way for tailoring the viscous flow properties of the hybrid material from a molecular level perspective.
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Affiliation(s)
- Yuanbiao Liu
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science & Engineering, East China University of Science & Technology, Shanghai 200237, China.
- School of Materials Science & Engineering, Shandong University of Technology, Zibo 255000, China
| | - Gaopeng Shi
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science & Engineering, East China University of Science & Technology, Shanghai 200237, China.
| | - Guozhang Wu
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science & Engineering, East China University of Science & Technology, Shanghai 200237, China.
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4
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Spyridakou M, Maji T, Gkikas M, Ngai KL, Floudas G. Sub-Rouse Dynamics in Poly(isobutylene) as a Function of Molar Mass. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c01653] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Tanmoy Maji
- Department of Chemistry, University of Massachusetts Lowell, Cambridge, Massachusetts, Lowell Massachusetts 01854, United States
| | - Manos Gkikas
- Department of Chemistry, University of Massachusetts Lowell, Cambridge, Massachusetts, Lowell Massachusetts 01854, United States
| | - Kia L. Ngai
- CNR-IPCF, Università di Pisa, Largo Bruno Pontecorvo 3, Pisa I-56127, Italy
| | - George Floudas
- Department of Physics, University of Ioannina, Ioannina 45110, Greece
- Institute of Materials Science and Computing, University Research Center of Ioannina (URCI), Ioannina 45110, Greece
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5
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Xu D, Feng S, Wang JQ, Wang LM, Richert R. Entropic Nature of the Debye Relaxation in Glass-Forming Monoalcohols. J Phys Chem Lett 2020; 11:5792-5797. [PMID: 32608239 DOI: 10.1021/acs.jpclett.0c01499] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The dynamics and thermodynamics of the Debye and structural (α) relaxations in isomeric monoalcohols near the glass transition temperature Tg are explored using dielectric and calorimetric techniques. The α relaxation strength at Tg is found to correlate with the heat capacity increment, but no thermal signals can be detected to link to the Debye relaxation. We also observed that the activation energy of the Debye relaxation in monoalcohols is quantitatively correlated with that of the α relaxation at the kinetic Tg, sharing the dynamic behavior of the Rouse modes found in polymers. The experimental results together with the analogy to the Rouse modes in polymers suggest that the Debye process in monoalcohols is an entropic process manifested by the total dipole fluctuation of the supramolecular structures, which is triggered and driven by the α relaxation.
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Affiliation(s)
- Di Xu
- State Key Lab of Metastable Materials Science and Technology, and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
| | - Shidong Feng
- State Key Lab of Metastable Materials Science and Technology, and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
| | - Jun-Qiang Wang
- CAS Key Laboratory of Magnetic Materials and Devices, and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
| | - Li-Min Wang
- State Key Lab of Metastable Materials Science and Technology, and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
| | - R Richert
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
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6
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Liu Y, Shi G, Wu G. Hydrogen bonding-induced anomalous dynamics of polyacrylates mixed with small molecules. POLYMER 2020. [DOI: 10.1016/j.polymer.2020.122627] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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7
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Plazek DJ, Ngai KL. Resolving the Sub-Rouse Modes by Creep Compliance Measurements in Poly(methyl- para-tolyl-siloxane). Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c00536] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- D. J. Plazek
- Department of Mechanical Engineering and Material Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - K. L. Ngai
- CNR-IPCF, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
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8
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Effect of Aromatic Petroleum Resin on Damping Properties of Polybutyl Methacrylate. Polymers (Basel) 2020; 12:polym12030543. [PMID: 32131517 PMCID: PMC7182884 DOI: 10.3390/polym12030543] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 02/28/2020] [Accepted: 02/29/2020] [Indexed: 11/17/2022] Open
Abstract
The damping properties of polybutyl methacrylate (PBMA)/aromatic petroleum resin (C9) composite were investigated in this work. In particular, a trace of styrene (St) was introduced to copolymerize with PBMA to improve the compatibility between C9 and matrix. The structure of the copolymer, P(BMA-co-St), was characterized by FTIR and 1HNMR. The P(BMA-co-St)/C9 composites were tested by differencial scanning calorimetry (DSC), scanning electron microscopy (SEM) and dynamical mechanical analysis (DMA). DSC curves of all P(BMA-co-1wt%St)/C9 composites expressed only one glass transition temperature (Tg). SEM images showed that C9 had good compatibility with the matrix after St was introduced. DMA curves indicated that the addition of C9 had a positive effect on the damping properties of PBMA. The loss tangent (tanδ) peak moved to a higher temperature with the increment content of C9, and the effective damping temperature range increased significantly. The influence of aromatic resin C9 and aliphatic resin (C5) on PBMA damping performance was compared. It was further shown that C9 with benzene ring effectively improved the damping performance of PBMA.
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9
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Tu W, Ngai KL, Paluch M, Adrjanowicz K. Dielectric Study on the Well-Resolved Sub-Rouse and JG β-Relaxations of Poly(methylphenylsiloxane) at Ambient and Elevated Pressures. Macromolecules 2020. [DOI: 10.1021/acs.macromol.9b02332] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Wenkang Tu
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
- Silesian Center for Education and Interdisciplinary Research, 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
| | - K. L. Ngai
- State Key Lab of Metastable Materials Science and Technology, and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
- CNR-IPCF, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
| | - Marian Paluch
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
- Silesian Center for Education and Interdisciplinary Research, 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
| | - Karolina Adrjanowicz
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
- Silesian Center for Education and Interdisciplinary Research, 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
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10
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Quadratic Non-Linear Optical Properties of the poly(2,5- bis(but-2-ynyloxy) Benzoate Containing the 2-(ethyl(4-((4-nitrophenyl)buta-1,3-diynyl)phenyl)amino)ethanol) Chromophore. Polymers (Basel) 2020; 12:polym12010241. [PMID: 31968552 PMCID: PMC7023667 DOI: 10.3390/polym12010241] [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: 08/08/2019] [Revised: 10/18/2019] [Accepted: 10/28/2019] [Indexed: 11/17/2022] Open
Abstract
Excellent quadratic non-linear optical (ONL-2) properties of the poly(2,5-bis(but-2-ynyloxy) benzoate, containing a polar diacetylene as a chromophore, were found. According with the Maker fringes method, oriented polymer films showing an order parameter of ∼0.23 can display outstanding and stable Second Harmonic Generation (SHG) effects under off-resonant conditions (SHG-532 nm). Also, the macroscopic non-linear optical (NLO)-coefficients were evaluated under the rod-like molecular approximation, obtaining: χzzz(2) and χzxx(2) in the order of 280 ± 10 and 100 ± 10 pm V-1, respectively. The mechanical and chemical properties, in addition to the large ONL-2 coefficients exhibited by this polymer, make it a promising organic material in the development of optoelectronic/photonic devices.
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11
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Opposite Effects of SiO 2 Nanoparticles on the Local α and Larger-Scale α' Segmental Relaxation Dynamics of PMMA Nanocomposites. Polymers (Basel) 2019; 11:polym11060979. [PMID: 31163669 PMCID: PMC6630292 DOI: 10.3390/polym11060979] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 05/24/2019] [Accepted: 05/24/2019] [Indexed: 12/27/2022] Open
Abstract
The segmental relaxation dynamics of poly(methyl methacrylate)/silica (PMMA/SiO2) nanocomposites with different compositions (ϕSiO2) near and above the glass transition temperature were investigated by mechanical spectroscopy. At ϕSiO2 ≤ 0.5%, the α peak temperature hardly changes with ϕSiO2, but that of α’ relaxation composed of Rouse and sub-Rouse modes decreases by 15 °C due to the increase of free volume. At ϕSiO2 ≥ 0.7%, both α and α’ relaxations shift to high temperatures because of the steric hindrance introduced by nanoparticle agglomeration. On the other hand, with increasing ϕSiO2, the peak height for α relaxation increases at ϕSiO2 ≤ 0.5% and then decreases at ϕSiO2 ≥ 0.7%, but that for α’ relaxation shows an opposite behavior. This is because at low ϕSiO2, the short-chain segments related to α relaxation can easily bypass the particles, but the longer-chain segments related to α’ relaxation cannot. At high ϕSiO2, the polymer chains were bound to the nanoparticles due to the physical adsorption effect, leading to the decrease of relaxation unit concentration involved in α relaxation. However, the dissociation of those bonds with heating and the concentration heterogeneity of polymer chains result in the increase of peak height for α’ relaxation.
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12
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Adrjanowicz K, Winkler R, Chat K, Duarte DM, Tu W, Unni AB, Paluch M, Ngai KL. Study of Increasing Pressure and Nanopore Confinement Effect on the Segmental, Chain, and Secondary Dynamics of Poly(methylphenylsiloxane). Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b00473] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- K. Adrjanowicz
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
- Silesian Center for Education and Interdisciplinary Research (SMCEBI), 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
| | - R. Winkler
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
- Silesian Center for Education and Interdisciplinary Research (SMCEBI), 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
| | - K. Chat
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
- Silesian Center for Education and Interdisciplinary Research (SMCEBI), 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
| | - D. M. Duarte
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
- Silesian Center for Education and Interdisciplinary Research (SMCEBI), 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
| | - W. Tu
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
- Silesian Center for Education and Interdisciplinary Research (SMCEBI), 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
| | - A. B. Unni
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
- Silesian Center for Education and Interdisciplinary Research (SMCEBI), 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
| | - M. Paluch
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
- Silesian Center for Education and Interdisciplinary Research (SMCEBI), 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
| | - K. L. Ngai
- CNR-IPCF, Largo Bruno Pontecorvo 3, I-56127 Pisa, Italy
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13
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Ngai KL, Capaccioli S, Wang LM. Segmental α-Relaxation for the First Step and Sub-Rouse Modes for the Second Step in Enthalpy Recovery in the Glassy State of Polystyrene. Macromolecules 2019. [DOI: 10.1021/acs.macromol.8b02125] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- K. L. Ngai
- CNR-IPCF, Università di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
- State Key Lab of Metastable Materials Science and Technology and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
| | - Simone Capaccioli
- CNR-IPCF, Università di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
| | - Li-Min Wang
- State Key Lab of Metastable Materials Science and Technology and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
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14
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Jedrzejowska A, Hensel-Bielowka S, Koperwas K, Jurkiewicz K, Chmiel K, Jacquemin J, Kruk D, Paluch M. Peculiar relaxation dynamics of propylene carbonate derivatives. J Chem Phys 2019; 150:044504. [PMID: 30709305 DOI: 10.1063/1.5055204] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
The aim of this work is to analyze in detail the effect of the alkyl chain length on the dynamics of glass-forming propylene carbonate (PC) derivatives. Examined samples are low-molecular weight derivatives of the PC structure, i.e., the 4-alkyl-1,3-dioxolan-2-one series, modified by changing the alkyl substituent from methyl to hexyl. The molecular dynamics (MD) has been analyzed based on experimental data collected from differential scanning calorimetry, broadband dielectric spectroscopy (BDS), X-ray diffraction (XRD), and nuclear magnetic resonance relaxometry measurements as well as MD simulations. The dielectric results show in samples with the propyl- or longer carbon chain the presence of slow Debye-like relaxation with features similar to those found in associative materials. Both XRD and MD reveal differences in the intermolecular structure between PC and 4-butyl-1,3-dioxolan-2-one liquids. Moreover, MD shows that the probability of finding one terminal carbon atom of the side chain of BPC in the vicinity of another carbon atom of the same type is much higher than in the case of PC. It suggests that there is a preference for longer hydrocarbon chains to set themselves close to each other. Consequently, the observed slow-mode peak may be caused by movement of aggregates maintained by van der Waals interactions. Reported herein, findings provide a new insight into the molecular origin of Debye-like relaxation.
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Affiliation(s)
- Agnieszka Jedrzejowska
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
| | | | - Kajetan Koperwas
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
| | - Karolina Jurkiewicz
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
| | - Krzysztof Chmiel
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
| | - Johan Jacquemin
- School of Chemistry and Chemical Engineering, Queen's University Belfast, Belfast BT9 5AG, Northern Ireland
| | - Danuta Kruk
- Faculty of Mathematics and Computer Science, University of Warmia and Mazury in Olsztyn, Sloneczna 54, PL-10-710 Olsztyn, Poland
| | - Marian Paluch
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
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15
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Gainaru C, Hecksher T, Fan F, Xing K, Cetinkaya B, Olsen NB, Dyre JC, Sokolov AP, Böhmer R. Simple-liquid dynamics emerging in the mechanical shear spectra of poly(propylene glycol). Colloid Polym Sci 2017. [DOI: 10.1007/s00396-017-4206-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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16
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Ngai KL, Capaccioli S. Surface Diffusion of Polymer Glasses Redux. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01098] [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)
- K. L. Ngai
- CNR-IPCF, Largo B. Pontecorvo
3, I-56127 Pisa, Italy
| | - Simone Capaccioli
- CNR-IPCF, Largo B. Pontecorvo
3, I-56127 Pisa, Italy
- Dipartimento di Fisica, Università di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
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17
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Luo MC, An R, Gao XX, Zeng J, Huang GS. Role of epoxidation on segmental motion of polyisoprene as studied by broadband dielectric spectroscopy. J Appl Polym Sci 2016. [DOI: 10.1002/app.43879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ming-Chao Luo
- State Key Laboratory of Polymer Material Engineering; College of Polymer Science and Engineering, Sichuan University; Chengdu 610065 People's Republic of China
| | - Ran An
- State Key Laboratory of Polymer Material Engineering; College of Polymer Science and Engineering, Sichuan University; Chengdu 610065 People's Republic of China
| | - Xiao-Xiao Gao
- State Key Laboratory of Polymer Material Engineering; College of Polymer Science and Engineering, Sichuan University; Chengdu 610065 People's Republic of China
| | - Jian Zeng
- State Key Laboratory of Polymer Material Engineering; College of Polymer Science and Engineering, Sichuan University; Chengdu 610065 People's Republic of China
| | - Guang-Su Huang
- State Key Laboratory of Polymer Material Engineering; College of Polymer Science and Engineering, Sichuan University; Chengdu 610065 People's Republic of China
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18
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Li S, Zhang X, Gu Z, Cao H, Ding X, Zheng K, Chen L, Tian X. Strain rate-regulated sub-Rouse transition in polystyrene via dynamic mechanical spectroscopy. Colloid Polym Sci 2015. [DOI: 10.1007/s00396-015-3732-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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19
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Kozanecki M, Pastorczak M, Okrasa L, Ulanski J, Yoon JA, Kowalewski T, Matyjaszewski K, Koynov K. Evolution of high-temperature molecular relaxations in poly(2-(2-methoxyethoxy)ethyl methacrylate) upon network formation. Colloid Polym Sci 2015; 293:1357-1367. [PMID: 26316672 PMCID: PMC4544547 DOI: 10.1007/s00396-015-3517-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Revised: 01/09/2015] [Accepted: 01/15/2015] [Indexed: 12/04/2022]
Abstract
Copolymers of 2-(2-methoxyethoxy)ethyl methacrylate (poly(MEO2MA)) are regarded as bioinert replacements of poly(N-isopropylacrylamide) in some biomedical applications. Networks of poly(MEO2MA) of various architecture form thermo-responsive hydrogels. Here, we present dielectric and mechanical spectroscopy studies on segmental motions and network relaxation processes in linear poly(MEO2MA) and its networks - bare network and the network grafted with short poly(MEO2MA) chains. We show that the α process assigned to the segmental motions of poly(MEO2MA) is independent on the polymer topology and the glass transition temperature, Tg, associated with this process equals 235-236 K for all investigated systems. The α' relaxation observed above Tg by dynamical mechanical analysis is assigned to the sub-Rouse process. It strongly depends on the polymer network architecture and slows down by four orders of magnitude upon network formation.
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Affiliation(s)
- Marcin Kozanecki
- Department of Molecular Physics, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Marcin Pastorczak
- Department of Molecular Physics, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Lidia Okrasa
- Department of Molecular Physics, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Jacek Ulanski
- Department of Molecular Physics, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Jeong Ae Yoon
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213 USA
| | - Tomasz Kowalewski
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213 USA
| | - Krzysztof Matyjaszewski
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213 USA
| | - Kaloian Koynov
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55021 Mainz, Germany
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20
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Wu X, Liu CS, Ngai KL. Origin of the crossover in dynamics of the sub-Rouse modes at the same temperature as the structural α-relaxation in polymers. SOFT MATTER 2014; 10:9324-9333. [PMID: 25341184 DOI: 10.1039/c4sm01658k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The nature of the liquid-glass transition remains an unsolved fundamental problem. One aspect is the striking change in dynamics of the structural α-relaxation generally observed at a temperature T(B) above Tg in all glass-formers. More intriguing in the case of polymers is that the change of dynamics occurs not only in the structural α-relaxation but also in the sub-Rouse modes, i.e. chain modes in between the α-relaxation and the Rouse modes. However, the nature of the dynamic crossover of the sub-Rouse modes remains unclear. In this paper, the dynamics of a series of poly(n-alkyl methacrylates) with different molecular weights and microstructures studied by mechanical spectroscopy are reported. We demonstrate that the sub-Rouse modes exhibit a similar crossover of dynamics at the same T(B) as the α-relaxation. This property shared by the two viscoelastic mechanisms is remarkable. By invoking the results from the studies using positron annihilation spectroscopy and adiabatic calorimetry, we show that both viscoelastic mechanisms are coupled to density, correlated with the change of the configuration entropy, and are intermolecularly cooperative. The time scale of sub-Rouse modes at T(B) of the polymers studied is approximately independent of molecular weight and micro-structure of the polymers studied. The findings enhance the understanding of the sub-Rouse modes and their manifestation in the viscoelasticity of polymers in the glass-rubber transition region.
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Affiliation(s)
- Xuebang Wu
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, P.O. Box 1129, Hefei, Anhui, People's Republic of China.
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21
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Pye JE, Roth CB. Above, below, and in-between the two glass transitions of ultrathin free-standing polystyrene films: Thermal expansion coefficient and physical aging. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/polb.23635] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Justin E. Pye
- Department of Physics; Emory University; Atlanta Georgia 30322
| | - Connie B. Roth
- Department of Physics; Emory University; Atlanta Georgia 30322
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22
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Ngai KL, Plazek DJ. Thermo-Rheological, Piezo-Rheological, and TVγ-Rheological Complexities of Viscoelastic Mechanisms in Polymers. Macromolecules 2014. [DOI: 10.1021/ma501843u] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- K. L. Ngai
- Dipartimento
di Fisica, Università di Pisa, Largo B. Pontecorvo 3, I-56127, Pisa, Italy
- CNR-IPCF, Largo B. Pontecorvo 3, I-56127, Pisa, Italy
| | - D. J. Plazek
- Department of Mechanical
Engineering and Material Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15261United States
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23
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Hensel-Bielowka S, Wojnarowska Z, Knapik J, Paluch M. New insight into relaxation dynamics of an epoxy/hydroxy functionalized polybutadiene from dielectric and mechanical spectroscopy studies. Colloid Polym Sci 2014; 292:1853-1862. [PMID: 25100898 PMCID: PMC4115185 DOI: 10.1007/s00396-014-3254-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Revised: 05/07/2014] [Accepted: 05/08/2014] [Indexed: 11/22/2022]
Abstract
Dielectric and mechanical spectroscopy methods have been employed to describe the temperature dependencies of the segmental and macromolecular relaxation rates in epoxy/hydroxy functionalized polybutadiene. Dielectric studies on the dynamics of segments of the polymer as well as the mobility of small ions trapped in the system have been carried out both as a function of temperature and pressure under isobaric and isothermal conditions, respectively.
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Affiliation(s)
- S Hensel-Bielowka
- Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland
| | - Z Wojnarowska
- Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
| | - J Knapik
- Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
| | - M Paluch
- Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
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24
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Cangialosi D. Dynamics and thermodynamics of polymer glasses. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:153101. [PMID: 24675099 DOI: 10.1088/0953-8984/26/15/153101] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The fate of matter when decreasing the temperature at constant pressure is that of passing from gas to liquid and, subsequently, from liquid to crystal. However, a class of materials can exist in an amorphous phase below the melting temperature. On cooling such materials, a glass is formed; that is, a material with the rigidity of a solid but exhibiting no long-range order. The study of the thermodynamics and dynamics of glass-forming systems is the subject of continuous research. Within the wide variety of glass formers, an important sub-class is represented by glass forming polymers. The presence of chain connectivity and, in some cases, conformational disorder are unfavourable factors from the point of view of crystallization. Furthermore, many of them, such as amorphous thermoplastics, thermosets and rubbers, are widely employed in many applications. In this review, the peculiarities of the thermodynamics and dynamics of glass-forming polymers are discussed, with particular emphasis on those topics currently the subject of debate. In particular, the following aspects will be reviewed in the present work: (i) the connection between the pronounced slowing down of glassy dynamics on cooling towards the glass transition temperature (Tg) and the thermodynamics; and, (ii) the fate of the dynamics and thermodynamics below Tg. Both aspects are reviewed in light of the possible presence of a singularity at a finite temperature with diverging relaxation time and zero configurational entropy. In this context, the specificity of glass-forming polymers is emphasized.
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Affiliation(s)
- D Cangialosi
- Materials Physics Center, Paseo Manuel de Lardizabel 5 20018 San Sebastian, Spain
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25
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Gainaru C, Figuli R, Hecksher T, Jakobsen B, Dyre JC, Wilhelm M, Böhmer R. Shear-modulus investigations of monohydroxy alcohols: evidence for a short-chain-polymer rheological response. PHYSICAL REVIEW LETTERS 2014; 112:098301. [PMID: 24655283 DOI: 10.1103/physrevlett.112.098301] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2013] [Indexed: 06/03/2023]
Abstract
Liquids composed of small-molecule monohydroxy alcohols are demonstrated to display rheological behavior typical for oligomeric chains. This observation was made possible by rheological experiments in which more than seven decades in frequency and more than five decades on the mechanical modulus scale are covered. The singly hydrogen-bonded monohydroxy alcohols were chosen because they display significant, but surprisingly poorly understood effects of intermolecular association. Based on the present shear study, one can apply theoretical concepts of polymer science to understand the anomalous physical behavior of a wide range of hydrogen-bonded liquids.
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Affiliation(s)
- C Gainaru
- Fakultät für Physik, Technische Universität Dortmund, 44221 Dortmund, Germany
| | - R Figuli
- Karlsruher Institut für Technologie, 76128 Karlsruhe, Germany
| | - T Hecksher
- DNRF Centre "Glass and Time", IMFUFA, Department of Sciences, Roskilde University, Postbox 260, DK-4000 Roskilde, Denmark
| | - B Jakobsen
- DNRF Centre "Glass and Time", IMFUFA, Department of Sciences, Roskilde University, Postbox 260, DK-4000 Roskilde, Denmark
| | - J C Dyre
- DNRF Centre "Glass and Time", IMFUFA, Department of Sciences, Roskilde University, Postbox 260, DK-4000 Roskilde, Denmark
| | - M Wilhelm
- Karlsruher Institut für Technologie, 76128 Karlsruhe, Germany
| | - R Böhmer
- Fakultät für Physik, Technische Universität Dortmund, 44221 Dortmund, Germany
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26
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Prevosto D, Capaccioli S, Ngai KL. Origins of the two simultaneous mechanisms causing glass transition temperature reductions in high molecular weight freestanding polymer films. J Chem Phys 2014; 140:074903. [DOI: 10.1063/1.4865752] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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27
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Zhang F, He G, Xu K, Wu H, Guo S. The molecular dynamics of different relaxation modes in asymmetric chlorinated butyl rubber/petroleum resin blends. RSC Adv 2014. [DOI: 10.1039/c4ra00976b] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The PR plays a role like an anti-plasticizer in decreasing the free volume fraction of the CIIR/PR blend. The mobility of Rouse modes is confined significantly more than that of local segmental motion.
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Affiliation(s)
- Fengshun Zhang
- The State Key Laboratory of Polymer Materials Engineering
- Polymer Research Institute of Sichuan University
- Chengdu 610065, China
| | - Guansong He
- The State Key Laboratory of Polymer Materials Engineering
- Polymer Research Institute of Sichuan University
- Chengdu 610065, China
| | - Kangming Xu
- The State Key Laboratory of Polymer Materials Engineering
- Polymer Research Institute of Sichuan University
- Chengdu 610065, China
| | - Hong Wu
- The State Key Laboratory of Polymer Materials Engineering
- Polymer Research Institute of Sichuan University
- Chengdu 610065, China
| | - Shaoyun Guo
- The State Key Laboratory of Polymer Materials Engineering
- Polymer Research Institute of Sichuan University
- Chengdu 610065, China
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28
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Ngai KL, Capaccioli S. Unified explanation of the anomalous dynamic properties of highly asymmetric polymer blends. J Chem Phys 2013; 138:054903. [DOI: 10.1063/1.4789585] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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29
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Wu X, Wang H, Zhu Z, Liu CS. Quantifying Changes in the Low-Frequency Dynamics of Amorphous Polymers by 2D Correlation Mechanical Spectroscopy. J Phys Chem B 2012; 117:467-72. [DOI: 10.1021/jp311652h] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xuebang Wu
- Key Laboratory of Materials Physics,
Institute of Solid
State Physics, Chinese Academy of Sciences, P.O. Box 1129, Hefei 230031, P. R. China
| | - Huaguang Wang
- Key Laboratory of Materials Physics,
Institute of Solid
State Physics, Chinese Academy of Sciences, P.O. Box 1129, Hefei 230031, P. R. China
| | - Zhengang Zhu
- Key Laboratory of Materials Physics,
Institute of Solid
State Physics, Chinese Academy of Sciences, P.O. Box 1129, Hefei 230031, P. R. China
| | - C. S. Liu
- Key Laboratory of Materials Physics,
Institute of Solid
State Physics, Chinese Academy of Sciences, P.O. Box 1129, Hefei 230031, P. R. China
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30
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Ngai KL, Prevosto D, Grassia L. Viscoelasticity of nanobubble-inflated ultrathin polymer films: Justification by the coupling model. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/polb.23201] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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31
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Wu J, Huang G, Wang X, He X, Xu B. Changes in the Viscoelastic Mechanisms of Polyisobutylene by Plasticization. Macromolecules 2012. [DOI: 10.1021/ma3001274] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jinrong Wu
- College of Polymer Science and
Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China
| | - Guangsu Huang
- College of Polymer Science and
Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China
| | - Xiaoan Wang
- College of Polymer Science and
Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China
| | - Xiaojun He
- College of Polymer Science and
Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China
| | - Ben Xu
- Department of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409-3121, United
States
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32
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Wu X, Liu C, Zhu Z, Ngai KL, Wang LM. Nature of the Sub-Rouse Modes in the Glass−Rubber Transition Zone of Amorphous Polymers. Macromolecules 2011. [DOI: 10.1021/ma102897e] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xuebang Wu
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, P.O. Box1129, Hefei, Anhui, People’s Republic of China
| | - Changsong Liu
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, P.O. Box1129, Hefei, Anhui, People’s Republic of China
| | - Zhengang Zhu
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, P.O. Box1129, Hefei, Anhui, People’s Republic of China
| | - K. L. Ngai
- State Key Lab of Metastable Materials Science and Technology, and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei, 066004, People’s Republic of China
- CNR-IPCF Associate, Dipartimento di Fisica, Università di Pisa, Largo Bruno Pontecorvo 3, I-56127, Pisa, Italy
| | - Li-Min Wang
- State Key Lab of Metastable Materials Science and Technology, and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei, 066004, People’s Republic of China
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33
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Affiliation(s)
- A. Agapov
- Department of Polymer Science, University of Akron, Akron, Ohio 44325-3909, United States
- Department of Chemistry and Department of Physics & Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1600, United States, and Chemical Sciences Division, ORNL, Oak Ridge, Tennessee 37830-6197, United States
| | - A. P. Sokolov
- Department of Chemistry and Department of Physics & Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1600, United States, and Chemical Sciences Division, ORNL, Oak Ridge, Tennessee 37830-6197, United States
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