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Zhao Y, Wang Z, Hou G, Wu H, Fu L, Bockstaller MR, Qin X, Zhang L, Matyjaszewski K. Synthesis of Mechanically Robust Very High Molecular Weight Polyisoprene Particle Brushes by Atom Transfer Radical Polymerization. ACS Macro Lett 2024; 13:415-422. [PMID: 38526986 PMCID: PMC11025114 DOI: 10.1021/acsmacrolett.4c00089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Revised: 03/20/2024] [Accepted: 03/20/2024] [Indexed: 03/27/2024]
Abstract
Linear polyisoprene (PI) and SiO2-g-PI particle brushes were synthesized by both conventional and activators regenerated by electron transfer (ARGET) atom transfer radical polymerization (ATRP). The morphology and solution state study on the particle brushes by transmission electron microscopy (TEM) and dynamic light scattering (DLS) confirmed the successful grafting of PI ligands on the silica surface. The presence of nanoparticle clusters suggests low grafting density (associated with the limited initiation efficiency of ARGET for PI). Nevertheless, particle brushes with very high molecular weights, Mn > 300,000, were prepared, which significantly improved the dispersion of silica nanoparticles and also contributed to excellent mechanical performance. The reinforcing effects of SiO2 nanofillers and very high molecular weight PI ligands were investigated by dynamic mechanical analysis (DMA) as well as computational simulation for the cured linear PI homopolymer/SiO2-g-PI particle brush bulk films.
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Affiliation(s)
- Yuqi Zhao
- Department
of Materials Science & Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Zongyu Wang
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Guanyi Hou
- College
of Chemistry and Materials Engineering, Beijing Technology and Business University, 33th Fucheng Road, Beijing 100048, China
| | - Hanshu Wu
- Department
of Materials Science & Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Liye Fu
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Michael R. Bockstaller
- Department
of Materials Science & Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Xuan Qin
- State
Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Liqun Zhang
- State
Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Krzysztof Matyjaszewski
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
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2
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Hou G, Ren R, Shang W, Weng Y, Liu J. Molecular Dynamics Simulation of Polymer Nanocomposites with Supramolecular Network Constructed via Functionalized Polymer End-Grafted Nanoparticles. Polymers (Basel) 2023; 15:3259. [PMID: 37571153 PMCID: PMC10422474 DOI: 10.3390/polym15153259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 07/21/2023] [Accepted: 07/27/2023] [Indexed: 08/13/2023] Open
Abstract
Since the proposal of self-healing materials, numerous researchers have focused on exploring their potential applications in flexible sensors, bionic robots, satellites, etc. However, there have been few studies on the relationship between the morphology of the dynamic crosslink network and the comprehensive properties of self-healing polymer nanocomposites (PNCs). In this study, we designed a series of modified nanoparticles with different sphericity (η) to establish a supramolecular network, which provide the self-healing ability to PNCs. We analyzed the relationship between the morphology of the supramolecular network and the mechanical performance and self-healing behavior. We observed that as η increased, the distribution of the supramolecular network became more uniform in most cases. Examination of the segment dynamics of polymer chains showed that the completeness of the supramolecular network significantly hindered the mobility of polymer matrix chains. The mechanical performance and self-healing behavior of the PNCs showed that the supramolecular network mainly contributed to the mechanical performance, while the self-healing efficiency was dominated by the variation of η. We observed that appropriate grafting density is the proper way to effectively enhance the mechanical and self-healing performance of PNCs. This study provides a unique guideline for designing and fabricating self-healing PNCs with modified Nanoparticles (NPs).
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Affiliation(s)
- Guanyi Hou
- College of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing 100048, China; (R.R.); (W.S.)
| | - Runhan Ren
- College of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing 100048, China; (R.R.); (W.S.)
| | - Wei Shang
- College of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing 100048, China; (R.R.); (W.S.)
| | - Yunxuan Weng
- College of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing 100048, China; (R.R.); (W.S.)
| | - Jun Liu
- Center of Advanced Elastomer Materials, Beijing University of Chemical Technology, Beijing 100029, China;
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3
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Qu J, Chen Q, Huang W, Zhang L, Liu J. Dispersion and Diffusion Mechanism of Nanofillers with Different Geometries in Bottlebrush Polymers: Insights from Molecular Dynamics Simulation. J Phys Chem B 2022; 126:7761-7770. [PMID: 36169228 DOI: 10.1021/acs.jpcb.2c04389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The dispersion and diffusion mechanism of nanofillers in polymer nanocomposites (PNCs) are crucial for understanding the properties of PNCs, which is of great significance for the design of novel materials. Herein, we investigate the dispersion and diffusion behavior of two geometries of nanofillers, namely, spherical nanoparticles (SNPs) and nanorods (NRs), in bottlebrush polymers by utilizing coarse-grained molecular dynamics simulations. With the increase of the interaction strength between the nanofiller and polymer (εnp), both the SNPs and NRs experience a typical "aggregated phase-dispersed phase-bridged phase" state transition in the bottlebrush polymer matrix. We evaluate the validity of the Stokes-Einstein (SE) equation for predicting the diffusion coefficient of nanofillers in bottlebrush polymers. The results demonstrate that the SE predictions are slightly larger than the simulated values for small SNP sizes because the local viscosity that is felt by small SNPs in the densely grafted bottlebrush polymer does not differ much from the macroscopic viscosity. The relative size of the length of the NRs (L) and the radius of gyration (Rg) of the bottlebrush polymer play a key role in the diffusion of NRs. In addition, we characterize the anisotropic diffusion of NRs to analyze their translational and rotational diffusion. The motion of NRs in the direction perpendicular to the end-to-end vector is more hindered, indicating that there is a strong coupling between the rotation of NRs and the motion of the polymer. The NR motion shows stronger anisotropic diffusion at short time scales because of the steric effects generated by side chains of the bottlebrush polymer. In general, our results provide a fundamental understanding of the dispersion of nanofillers and the microscopic mechanism of nanofiller diffusion in bottlebrush polymers.
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Affiliation(s)
- Jiajun Qu
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China.,State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
| | - Qionghai Chen
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China.,State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
| | - Wanhui Huang
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China.,State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
| | - Liqun Zhang
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China.,State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
| | - Jun Liu
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China.,State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
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4
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Hou G, Li S, Liu J, Weng Y, Zhang L. Designing high performance polymer nanocomposites by incorporating robustness-controlled polymeric nanoparticles: insights from molecular dynamics. Phys Chem Chem Phys 2022; 24:2813-2825. [PMID: 35043809 DOI: 10.1039/d1cp04254h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Introducing polymeric nanoparticles into polymer matrices is an interesting topic, and the robustness of the polymeric nanoparticles is crucial for the properties of the polymer nanocomposites (PNCs). In this study, by incorporating star-shaped polymeric nanoparticles (SSPNs) into the polymer, the effect of the sphericity (η) and arm length (L) of the SSPNs on the mechanical properties of PNCs is systematically investigated, using a coarse-grained molecular dynamics simulation. In addition, the linear and spherical nanoparticles (NPs) are compared with SSPNs by fixing the approximate diameter and mass fraction of the NPs. The radial distribution function, the second virial coefficient, mean-squared displacement, bond autocorrelation function, and primitive path analysis are employed to systematically characterize the structure and dynamics of these new PNCs. It is found that the dispersion of the NPs is enhanced with the increase of η, and the entanglement density reaches maximum, which both contribute to the greatest mechanical reinforcing effect. More significantly, it is found that the classical Payne effect, namely the storage as a function of the strain amplitude, decreases remarkably, and with a much smaller loss factor for these SSPN filled polymer nanocomposites, compared to conventional PNCs filled with rigid NPs. Furthermore, the change of the arm length of the SSPNs is found to exhibit the same effect on the mechanical and viscoelastic properties, as the variation of the number of the arms. In general, this work shows that these new SSPN filled polymer nanocomposites can exceed conventional PNCs, by manipulating the robustness of the SSPNs using, for example, the number and length of the arms. This research may provide guidelines for the investigation of the structure-property relationships of the topological structure of polymeric nanoparticles.
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Affiliation(s)
- Guanyi Hou
- College of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing, 100048, People's Republic of China
| | - Sai Li
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China. .,Center of Advanced Elastomer Materials, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Jun Liu
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China. .,Center of Advanced Elastomer Materials, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Yunxuan Weng
- College of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing, 100048, People's Republic of China
| | - Liqun Zhang
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China. .,Center of Advanced Elastomer Materials, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
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5
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Han Y, Li K, Li Z, Liu J, Hu S, Wen S, Liu L, Zhang L. Molecular dynamics simulation of the formation mechanism of the thermal conductive filler network of polymer nanocomposites. Phys Chem Chem Phys 2022; 24:4334-4347. [DOI: 10.1039/d1cp03276c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work, the thermal transfer capabilities of spherical and laminar/spherical filled polymer nanocomposites (PNCs) were systematically investigated by using molecular dynamics (MD) simulation. The effects of various factors such...
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6
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Allahyarov E. Theoretical Study of Nanocomposite Permittivity with a Tunable Clustering of Inclusions. ADVANCED THEORY AND SIMULATIONS 2020. [DOI: 10.1002/adts.202000005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Elshad Allahyarov
- Theoretische Chemie Universität Duisburg‐Essen Essen D‐45141 Germany
- Theoretical Department Joint Institute for High Temperatures, RAS Moscow 125412 Russia
- Department of Physics Case Western Reserve University Cleveland OH 44106‐7202 USA
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7
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Ma Y, Zhang S, Xu Y, Liu X, Luo SN. Effects of temperature and grain size on deformation of polycrystalline copper-graphene nanolayered composites. Phys Chem Chem Phys 2020; 22:4741-4748. [PMID: 32057046 DOI: 10.1039/c9cp06830a] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effects of temperature and grain size on mechanical properties of polycrystalline copper-graphene nanolayered (PCuGNL) composites are investigated by analytical mechanical models and molecular dynamics simulations. The yield of PCuGNL composites under tension depends on temperature, copper grain size, and repeat layer spacing. Graphene-copper interfaces play the dominant role in the ultimate tensile strength of PCuGNL composites. The optimal range for strengthening of repeat layer spacing is 2-10 nm, and the failure stress of PCuGNL composites is weakly dependent on temperature. An analytical model is proposed to accurately characterize the mechanical behaviors of PCuGNL composites.
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Affiliation(s)
- Yunlong Ma
- The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, P. R. China.
| | - Sen Zhang
- The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, P. R. China.
| | - Yunfei Xu
- The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, P. R. China.
| | - Xiaoyi Liu
- The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, P. R. China.
| | - Sheng-Nian Luo
- The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, P. R. China. and Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu, Sichuan 610031, P. R. China
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8
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Surface Modification Design for Improving the Strength and Water Vapor Permeability of Waterborne Polymer/SiO 2 Composites: Molecular Simulation and Experimental Analyses. Polymers (Basel) 2020; 12:polym12010170. [PMID: 31936520 PMCID: PMC7023158 DOI: 10.3390/polym12010170] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 01/04/2020] [Accepted: 01/07/2020] [Indexed: 11/17/2022] Open
Abstract
Polymer-based nanocomposites properties are greatly affected by interfacial interaction. Polyacrylate nanocomposites have been widely studied, but few studies have been conducted on their interface mechanism. Therefore, there was an urgent demand for providing a thorough understanding of the polymethyl acrylate/SiO2 (PMA/SiO2) nanocomposites to obtain the desired macro-performance. In this paper, a methodology, which combined molecular dynamics simulation with experimental researches, was established to expound the effect of the surface structure of SiO2 particles which were treated with KH550, KH560 or KH570 (KH550-SiO2, KH560-SiO2 and KH570-SiO2) on the mechanical characteristic and water vapor permeability of polymethyl acrylate/SiO2 nanocomposites. The polymethyl acrylate/SiO2 nanocomposites were analyzed in binding energy and mean square displacement. The results indicate that PMA/KH570-SiO2 had the highest tensile strength, while PMA/KH550-SiO2 had the highest elongation at break at the same filler content; KH550-SiO2 spheres can significantly improve water vapor permeability of polyacrylate film.
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9
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Karami P, Salkhi Khasraghi S, Hashemi M, Rabiei S, Shojaei A. Polymer/nanodiamond composites - a comprehensive review from synthesis and fabrication to properties and applications. Adv Colloid Interface Sci 2019; 269:122-151. [PMID: 31082543 DOI: 10.1016/j.cis.2019.04.006] [Citation(s) in RCA: 52] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2018] [Revised: 03/14/2019] [Accepted: 04/24/2019] [Indexed: 11/28/2022]
Abstract
Nanodiamond (ND) is an allotrope of carbon nanomaterials which exhibits many outstanding physical, mechanical, thermal, optical and biocompatibility characteristics. Meanwhile, ND particles possess unique spherical shape containing diamond-like structure at the core with graphitic carbon outer shell which intuitively contains many oxygen-containing functional groups at the outer surface. Such superior properties and unique structural morphology of NDs are essentially attractive to develop polymer composites with multifunctional properties. However, despite a long history from the discovery of NDs, which is dated back to the1960s, this nanoparticle has been less explored in the field of polymer (nano)composites compared with other carbon nanomaterials, e.g. carbon nanotube (CNT) and graphene. However, open literature indicates that research works in the field of polymer/ND (PND) composites have gained great momentum in the past half a decade. The present article provides a comprehensive review on recent achievements in ND based polymer composites. This review covers a very broad aspect from the synthesis, purification and functionalization of NDs to dispersion, preparation and fabrication of polymer/ND (PND) composites with a look in their recent applications for both structural and functional basis. Therefore, the review would be useful to pave the way for researchers to take some advancing steps in this respect.
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Affiliation(s)
- Pooria Karami
- Department of Chemical and Petroleum Engineering, Sharif University of Technology, P.O. Box 11155-9465, Tehran, Iran
| | - Samaneh Salkhi Khasraghi
- Department of Chemical and Petroleum Engineering, Sharif University of Technology, P.O. Box 11155-9465, Tehran, Iran
| | - Mohammadjafar Hashemi
- Department of Chemical and Petroleum Engineering, Sharif University of Technology, P.O. Box 11155-9465, Tehran, Iran
| | - Sima Rabiei
- Department of Chemical and Petroleum Engineering, Sharif University of Technology, P.O. Box 11155-9465, Tehran, Iran
| | - Akbar Shojaei
- Department of Chemical and Petroleum Engineering, Sharif University of Technology, P.O. Box 11155-9465, Tehran, Iran.
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10
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Shen Z, Baker W, Ye H, Li Y. pH-Dependent aggregation and pH-independent cell membrane adhesion of monolayer-protected mixed charged gold nanoparticles. NANOSCALE 2019; 11:7371-7385. [PMID: 30938720 DOI: 10.1039/c8nr09617a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Design of pH-responsive monolayer-protected gold nanoparticles (AuNPs) that are mixed charged, with the ability to switch their net surface charge, based on the stimuli of environmental pH is a promising technique in nanomedicine. However, understanding of pH-responsive mixed charged AuNP behavior in terms of their stability and cellular interaction are still limited. In this work, we study the aggregation of pH-responsive AuNPs and their interaction with model lipid bilayers by adopting Martini coarse-grained (CG) molecular dynamics simulations. The surface of these AuNPs is decorated by both positively and negatively charged ligands. The AuNP is positively charged at low pH values due to protonation of negatively charged ligands. Its net charge is lowered at higher pH by increasing the ratio of deprotonated negatively charged ligands. We find that the AuNPs are severely aggregated at moderate pH value, where each AuNP has an overall neutral charge, whereas they are stable and dispersed at both low and high pH values. Further free energy analysis reveals that the energy barrier at a larger separation distance than the location of the hydrophobic driving force potential well, plays a key role that determines the stability of monolayer-protected AuNPs at different pH values. This energy barrier is dramatically decreased at moderate pH value, leading to severe aggregation of AuNPs. By investigating the interaction between AuNPs and model lipid bilayers, we find that all the AuNPs adhere onto the lipid bilayer, independent of the pH value. Moreover, the lipids present originally in the bilayer are extracted by the AuNPs through a process of protrusion and upward climbing. The extraction of lipids can cause dehydration and disruption of the bilayers when multiple AuNPs are adhered. Free energy analysis reveals that the penetration of AuNPs will induce a dramatic free energy increase because of deformation of the ligands with hydrophilic functional end groups. We have systematically studied the stability of pH-responsive AuNPs and their interactions with lipid bilayers by simulation, which might pave the way for the design of pH-responsive monolayer protected AuNPs for biomedical applications.
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Affiliation(s)
- Zhiqiang Shen
- Department of Mechanical Engineering and Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA.
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11
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Hou G, Xia X, Liu J, Wang W, Dong M, Zhang L. Designing Superlattice Structure via Self-Assembly of One-Component Polymer-Grafted Nanoparticles. J Phys Chem B 2019; 123:2157-2168. [PMID: 30742436 DOI: 10.1021/acs.jpcb.8b11118] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The control of the self-assembly of the nanocrystals into ordered structures has been extensively investigated, but fewer efforts have been devoted to studying one-component polymer-grafted nanoparticles (OPNPs). Herein, through coarse-grained molecular dynamics simulation, we design a novel nanoparticle (NP) grafted with polymer chains, focusing on its self-assembled structures. First, we examine the effects of length and density of grafted polymer chains by calculating the radial distribution function between NPs, as well as through direct visualization. We observe a monotonic change of the arranged morphology of grafted-NPs as a function of the density of grafted polymer chains, which indicates that the increase of the grafting density contributes to the order of the morphology. Meanwhile, we find that much longer grafted polymer chains worsen the regularity of the morphology. Then, we probe the influence of the stiffness of grafted polymer chains (denoted by K ranging from 0 to 500) on the order of grafted-NPs, finding that the order of the structure exhibits a nonmonotonic behavior as a function of K at moderate grafting density. For high grafting density, the order of the morphology is initially enhanced and becomes saturated as a function of K. For the effect of K on the stress-strain behavior, the system with the lowest order demonstrates the most remarkable reinforced mechanical behavior for both low and high grafting density. Last, we establish the phase diagram by varying the stiffness and density of the grafted polymer chains, which contains the amorphous, ordered, and superlattice structures, respectively. In general, our simulated results provide guidelines to tailor the self-assembly of the OPNPs by taking advantage of the length, density, and stiffness of grafted polymer chains.
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Affiliation(s)
| | - Xiuyang Xia
- Chemical Engineering, School of Chemical and Biomedical Engineering , Nanyang Technological University , 62 Nanyang Drive , 637459 , Singapore
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12
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Athir N, Shi L, Shah SAA, Zhang Z, Cheng J, Liu J, Zhang J. Molecular dynamics simulation of thermo-mechanical behaviour of elastomer cross-linked via multifunctional zwitterions. Phys Chem Chem Phys 2019; 21:21615-21625. [DOI: 10.1039/c9cp03221e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Coarse-grained (CG) molecular dynamics simulations have been employed to study the thermo-mechanical response of a physically cross-linked network composed of zwitterionic moieties and fully flexible elastomeric polymer chains.
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Affiliation(s)
- Naveed Athir
- Key Laboratory of Carbon Fiber and Functional Polymers
- Beijing University of Chemical Technology
- Ministry of Education
- Beijing
- P. R. China
| | - Ling Shi
- Key Laboratory of Carbon Fiber and Functional Polymers
- Beijing University of Chemical Technology
- Ministry of Education
- Beijing
- P. R. China
| | - Sayyed Asim Ali Shah
- Key Laboratory of Carbon Fiber and Functional Polymers
- Beijing University of Chemical Technology
- Ministry of Education
- Beijing
- P. R. China
| | - Zhiyu Zhang
- Beijing Engineering Research Center of Advanced Elastomers
- Beijing University of Chemical Technology
- People's Republic of China
| | - Jue Cheng
- Key Laboratory of Carbon Fiber and Functional Polymers
- Beijing University of Chemical Technology
- Ministry of Education
- Beijing
- P. R. China
| | - Jun Liu
- Beijing Engineering Research Center of Advanced Elastomers
- Beijing University of Chemical Technology
- People's Republic of China
| | - Junying Zhang
- Key Laboratory of Carbon Fiber and Functional Polymers
- Beijing University of Chemical Technology
- Ministry of Education
- Beijing
- P. R. China
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13
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Zhang S, Xu Y, Liu X, Luo SN. Competing roles of interfaces and matrix grain size in the deformation and failure of polycrystalline Cu-graphene nanolayered composites under shear loading. Phys Chem Chem Phys 2018; 20:23694-23701. [PMID: 30191248 DOI: 10.1039/c8cp04481c] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The roles of interfaces and matrix grain size in the deformation and failure of polycrystalline Cu-graphene nanolayered (PCuGNL) composites under shear loading are explored with molecular dynamics simulations for different repeat layer spacings (λ), Cu grain sizes (D) and graphene chiralities, and an analytical model is proposed to describe the shear behavior. At the yield stage, the yield stress of the PCuGNL composites is mainly controlled by λ for λ ≤ 15 nm but mainly by D for λ > 15 nm; the yield strain of the composites is approximately a constant value of 0.056, weakly dependent on λ, D and graphene chirality. The shear failure strain and failure stress are determined only by the Cu-graphene interfaces. Small λ reduces the stability of the composites, while large λ decreases their shear failure strength. Considering the yield, failure and interface stability, the optimum λ value for the PCuGNL composites is 2-15 nm. In this optimum λ range, PCuGNL composites can be designed by tailoring Cu-graphene interfaces, regardless of the microstructures of polycrystalline Cu.
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Affiliation(s)
- Sen Zhang
- The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, P. R. China.
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14
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Zhang Z, Hou G, Shen J, Liu J, Gao Y, Zhao X, Zhang L. Designing the Slide-Ring Polymer Network with both Good Mechanical and Damping Properties via Molecular Dynamics Simulation. Polymers (Basel) 2018; 10:E964. [PMID: 30960889 PMCID: PMC6403985 DOI: 10.3390/polym10090964] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2018] [Revised: 08/26/2018] [Accepted: 08/29/2018] [Indexed: 01/19/2023] Open
Abstract
Through coarse-grained molecular dynamics simulation, we have successfully designed the chemically cross-linked (fixed junction) and the slide-ring (SR) systems. Firstly, we examine the dynamic properties such as the mean-square displacement, the bond, and the end-to-end autocorrelation functions as a function of the cross-linking density, consistently pointing out that the SR system exhibits much lower mobility compared with the fixed junction one at the same cross-linking density. This is further validated by a relatively higher glass transition temperature for the SR system compared with that of the fixed junction one. Then, we calculated the effect of the cross-linking density on the stretch-recovery behavior for the SR and fixed junction systems. Although the chain orientation of the SR system is higher than that of the fixed-junction system, the tensile stress is smaller than the latter. We infer that much greater chain sliding can occur during the stretch, because the movable ring structure homogeneously sustains the external force of the SR system, which, therefore, leads to much larger permanent set and higher hysteresis during the recovery process compared with the fixed-junction one. Based on the stretch-recovery behavior for various cross-linking densities, we obtain the change of the hysteresis loss, which is larger for the SR system than that of the fixed junction system. Lastly, we note that the relatively bigger compressive stress for the SR system results from the aggregation of the rigid rings compared with the fixed junction system. In general, compared with the traditionally cross-linked system, a deep molecular-level insight into the slide-ring polymer network is offered and thus is believed to provide some guidance to the design and preparation of the slide-ring polymer network with both good mechanical and damping properties.
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Affiliation(s)
- Zhiyu Zhang
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Guanyi Hou
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Jianxiang Shen
- Department of Polymer Science and Engineering, Jiaxing University, Jiaxing 314001, China.
| | - Jun Liu
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, China.
- Beijing Engineering Research Center of Advanced Elastomers, Beijing University of Chemical Technology, Beijing 100029, China.
- Engineering Research Center of Elastomer Materials on Energy Conservation and Resources, Beijing University of Chemical Technology, Beijing 100029, China.
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Yangyang Gao
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Xiuying Zhao
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Liqun Zhang
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, China.
- Beijing Engineering Research Center of Advanced Elastomers, Beijing University of Chemical Technology, Beijing 100029, China.
- Engineering Research Center of Elastomer Materials on Energy Conservation and Resources, Beijing University of Chemical Technology, Beijing 100029, China.
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China.
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15
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Song Q, Ji Y, Li S, Wang X, He L. Adsorption Behavior of Polymer Chain with Different Topology Structure at the Polymer-Nanoparticle Interface. Polymers (Basel) 2018; 10:polym10060590. [PMID: 30966624 PMCID: PMC6404055 DOI: 10.3390/polym10060590] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 05/21/2018] [Accepted: 05/25/2018] [Indexed: 12/01/2022] Open
Abstract
The effect of the polymer chain topology structure on the adsorption behavior in the polymer-nanoparticle (NP) interface is investigated by employing coarse-grained molecular dynamics simulations in various polymer-NP interaction and chain stiffness. At a weak polymer-NP interaction, ring chain with a closed topology structure has a slight priority to occupy the interfacial region than linear chain. At a strong polymer-NP interaction, the “middle” adsorption mechanism dominates the polymer local packing in the interface. As the increase of chain stiffness, an interesting transition from ring to linear chain preferential adsorption behavior occurs. The semiflexible linear chain squeezes ring chain out of the interfacial region by forming a helical structure and wrapping tightly the surface of NP. In particular, this selective adsorption behavior becomes more dramatic for the case of rigid-like chain, in which 3D tangent conformation of linear chain is absolutely prior to the 2D plane orbital structure of ring chain. The local packing and competitive adsorption behavior of bidisperse matrix in polymer-NP interface can be explained based on the adsorption mechanism of monodisperse (pure ring or linear) case. These investigations may provide some insights into polymer-NP interfacial adsorption behavior and guide the design of high-performance nanocomposites.
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Affiliation(s)
- Qingliang Song
- Department of Physics, Wenzhou University, Wenzhou 325035, China.
| | - Yongyun Ji
- Department of Physics, Wenzhou University, Wenzhou 325035, China.
| | - Shiben Li
- Department of Physics, Wenzhou University, Wenzhou 325035, China.
| | - Xianghong Wang
- Department of Physics, Wenzhou University, Wenzhou 325035, China.
| | - Linli He
- Department of Physics, Wenzhou University, Wenzhou 325035, China.
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16
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Liu X, Cai J, Luo SN. Interfacial anti-fatigue effect in graphene-copper nanolayered composites under cyclic shear loading. Phys Chem Chem Phys 2018; 20:7875-7884. [PMID: 29509205 DOI: 10.1039/c8cp00127h] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Low-cycle fatigue behaviors of graphene-copper nanolayered (GCuNL) composites are explored at different interface configurations and repeat layer spacings. The graphene interfaces can trap dislocations through impeding the propagation of dislocations in copper layers, giving rise to the absence of softening, and an increase in the fatigue strength of GCuNL composites (up to 400% that of pure copper). This anti-fatigue effect is independent of the crystal orientation of copper or the chirality of graphene due to interfacial constraints and can be controlled by tailoring the repeat layer spacing. Low repeat layer spacing increases the instability and nonlinearity of the composites, while high repeat layer spacing decreases the anti-fatigue effect. The optimum value of the repeat layer spacing for the GCuNL composites is 3-7 nm, in order to achieve a balanced anti-fatigue capability and interface stability.
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Affiliation(s)
- Xiaoyi Liu
- The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, P. R. China.
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