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Mehrabi Mazidi M, Sharifi H, Razavi Aghjeh MK, Zare L, Khonakdar HA, Reuter U. Correction to "Super-Tough PLA-Based Blends with Excellent Stiffness and Greatly Improved Thermal Resistance via Interphase Engineering". ACS APPLIED MATERIALS & INTERFACES 2024; 16:17065-17066. [PMID: 38508865 DOI: 10.1021/acsami.4c04088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/22/2024]
Affiliation(s)
- Majid Mehrabi Mazidi
- Faculty of Polymer Engineering, Sahand University of Technology, Tabriz 51335-1996, Iran
| | - Hossein Sharifi
- Department of Materials Science and Engineering, Sharif University of Technology, Tehran 1458889694, Iran
| | | | - Leila Zare
- Faculty of Polymer and Chemistry Sciences, Islamic Azad University, Fasa 7461195531, Iran
| | - Hossein Ali Khonakdar
- Department of Polymer Processing, Iran Polymer and Petrochemical Institute, 1497713115 Tehran, Iran
| | - Uta Reuter
- Leibniz-Institut fur Polymerforschung Dresden e.V., 01069 Dresden, Germany
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Shi H, Zhuang Q, Zheng A, Guan Y, Wei D, Xu X. Study of the radical polymerization mechanism and its application in the preparation of high-performance PMMA by reactive extrusion. RSC Adv 2023; 13:7225-7236. [PMID: 36891487 PMCID: PMC9986722 DOI: 10.1039/d2ra06441c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Accepted: 01/18/2023] [Indexed: 03/08/2023] Open
Abstract
In this study, the mechanism of radical polymerization was further explored by pre-dissolving different polymers and studying the kinetics of the bulk polymerization of methyl methacrylate (MMA) under shear-free conditions. Based on the analysis of the conversion and absolute molecular weight, it was found that, contrary to the shearing effect, the inert polymer with viscosity was the key factor to preventing the mutual termination of radical active species and reducing the termination rate constant k t. Therefore, pre-dissolving the polymer could increase the polymerization rate and molecular weight of the system simultaneously, making the polymerization system enter the automatic acceleration zone faster and greatly reducing the generation of small molecular weight polymers, leading to a narrower molecular weight distribution. When the system entered the auto-acceleration zone, k t decreased rapidly and greatly and entered the second steady-state polymerization stage. Then, with the increase in the polymerization conversion, the molecular weight gradually increased, while the polymerization rate gradually decreased. In shear-free bulk polymerization systems, k t can be minimized and radical lifetimes maximized, but the polymerization system is at best a long-lived polymerization rather than a living polymerization. On this basis, by using MMA to pre-dissolve ultrahigh molecular weight PMMA and core-shell particles (CSR), the mechanical properties and heat resistance of the PMMA with pre-dissolved polymer obtained by reactive extrusion polymerization were better than for pure PMMA obtained under the same conditions. Compared with pure PMMA, the flexural strength and impact strength of PMMA with pre-dissolved CSR were up to 166.2% and 230.5%. With the same quality of CSR, the same two mechanical properties of the samples obtained by the blending method were just improved by 29.0% and 20.4%. This was closely related to the distribution of CSR in the pre-dissolved PMMA-CSR matrix with a distribution of spherical single particles 200-300 nm in diameter, which enabled PMMA-CSR to exhibit a high degree of transparency. This one-step process for realizing PMMA polymerization and high performance shows extremely high industrial application prospects.
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Affiliation(s)
- Han Shi
- Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology Shanghai 200237 China
| | - Qixin Zhuang
- Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology Shanghai 200237 China
| | - Anna Zheng
- Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology Shanghai 200237 China
| | - Yong Guan
- Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology Shanghai 200237 China
| | - Dafu Wei
- Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology Shanghai 200237 China
| | - Xiang Xu
- Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology Shanghai 200237 China
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Molero G, Liu C, Zhu Z, Chen Q, Peterson SR, Kolluru PV, Sue HJ, Uenuma S, Mayumi K, Ito K. Fracture Behavior of Polyrotaxane-Toughened Poly(Methyl Methacrylate). LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:2335-2345. [PMID: 35129976 DOI: 10.1021/acs.langmuir.1c03216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The fracture behavior of polyrotaxane (PR)-modified poly(methyl methacrylate) (PMMA) was investigated. PR is a supramolecule with rings threaded onto a linear backbone chain, which is capped by bulky end groups to prevent the rings from de-threading. The ring structure is α-cyclodextrin (CD), and it can be functionalized to enhance its affinity with the hosting polymer matrix. Adding only 1 wt % of PR containing methacrylate functional groups (mPR) at the terminal of some of the polycaprolactone-grafted chains on CD promotes massive crazing, resulting in a significant improvement in fracture toughness while maintaining the modulus and transparency of the PMMA matrix. Dynamic mechanical analysis and atomic force microscopy studies reveal that mPR strongly interact with PMMA, leading to higher molecular mobility and enhanced molecular cooperativity during deformation. This molecular cooperativity may be responsible for the formation of massive crazing in a PMMA matrix, which leads to greatly improved fracture toughness.
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Affiliation(s)
- Glendimar Molero
- Department of Materials Science and Engineering, Polymer Technology Center, Texas A&M University, College Station, Texas 77843, United States
| | - Cong Liu
- Department of Materials Science and Engineering, Polymer Technology Center, Texas A&M University, College Station, Texas 77843, United States
| | - Zewen Zhu
- Department of Materials Science and Engineering, Polymer Technology Center, Texas A&M University, College Station, Texas 77843, United States
| | - Qihui Chen
- Department of Materials Science and Engineering, Polymer Technology Center, Texas A&M University, College Station, Texas 77843, United States
| | - Suzanne R Peterson
- Department of Materials Science and Engineering, Polymer Technology Center, Texas A&M University, College Station, Texas 77843, United States
| | - Pavan V Kolluru
- Department of Materials Science and Engineering, Polymer Technology Center, Texas A&M University, College Station, Texas 77843, United States
| | - Hung-Jue Sue
- Department of Materials Science and Engineering, Polymer Technology Center, Texas A&M University, College Station, Texas 77843, United States
| | - Shuntaro Uenuma
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa-city, Chiba 227-8561, Japan
| | - Koichi Mayumi
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa-city, Chiba 227-8561, Japan
| | - Kohzo Ito
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa-city, Chiba 227-8561, Japan
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