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Payizila Z, Teng F, Huang X, Liu W, Wu T, Sun Q, Zhao S. Efficient Fabrication of Self-Assembled Polylactic Acid Colloidosomes for Pesticide Encapsulation. ACS OMEGA 2024; 9:3781-3792. [PMID: 38284048 PMCID: PMC10809374 DOI: 10.1021/acsomega.3c07802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Revised: 12/07/2023] [Accepted: 12/26/2023] [Indexed: 01/30/2024]
Abstract
Colloidosomes are microcapsules whose shells are composed of cumulated or fused colloidal particles. When colloidosomes are used for in situ encapsulation, it is still a challenge to achieve a high encapsulation efficiency and controllable release by an effective fabrication method. Herein, we present a highly efficient route for the large-scale preparation of colloidosomes. The biodegradable polylactic acid (PLA) nanoparticles (NPs) as shell materials can be synthesized using an antisolvent precipitation method, and the possible formation mechanism was given through the molecular dynamics (MD) simulation. The theoretical values are basically consistent with the experimental results. Through the use of the modified and unmodified PLA NPs, the colloidosomes with controllable shell porosities can be easily constructed using spray drying technology. We also investigate the mechanism of colloidosomes successfully self-assembled by PLA NPs with various factors of inlet temperature, feed rate, and flow rates of compressed air. Furthermore, avermectin (AVM) was used as a model for in situ encapsulation and a controllable release. The spherical modified colloidosomes encapsulating AVM not only achieve a small mean diameter of 1.57 μm but also realize a high encapsulation efficiency of 89.7% and impermeability, which can be further verified by the MD simulation. AVM molecules gather around and clog the shell pores during the evaporation of water molecules. More importantly, the PLA colloidosomes also reveal excellent UV-shielding properties, which can protect AVM from photodegradation.
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Affiliation(s)
- Zulipiker Payizila
- Guangxi
Key Laboratory of Petrochemical Resource Processing and Process Intensification
Technology and School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
| | - Fuquan Teng
- Guangxi
Key Laboratory of Petrochemical Resource Processing and Process Intensification
Technology and School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
| | - Xudong Huang
- Guangxi
Key Laboratory of Petrochemical Resource Processing and Process Intensification
Technology and School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
| | - Wenbiao Liu
- Guangxi
Key Laboratory of Petrochemical Resource Processing and Process Intensification
Technology and School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
| | - Tengfei Wu
- Guangxi
Key Laboratory of Petrochemical Resource Processing and Process Intensification
Technology and School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
| | - Qian Sun
- Guangxi
Key Laboratory of Petrochemical Resource Processing and Process Intensification
Technology and School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
- State
Key Laboratory of Featured Metal Materials and Life-Cycle Safety for
Composite Structures, Guangxi University, Nanning 530004, China
| | - Shuangliang Zhao
- Guangxi
Key Laboratory of Petrochemical Resource Processing and Process Intensification
Technology and School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
- State
Key Laboratory of Featured Metal Materials and Life-Cycle Safety for
Composite Structures, Guangxi University, Nanning 530004, China
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Song J, Qin H, Qin S, Liu M, Zhang S, Chen J, Zhang Y, Wang S, Li Q, Dong L, Xiong C. Alicyclic polyimides with large band gaps exhibit superior high-temperature capacitive energy storage. MATERIALS HORIZONS 2023; 10:2139-2148. [PMID: 36947003 DOI: 10.1039/d2mh01511k] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Flexible polymer dielectrics for capacitive energy storage that can function well at elevated temperatures are increasingly in demand for continuously advancing and miniaturizing electrical devices. However, traditional high-resistance polymer dielectrics composed of aromatic backbones have a compromised band gap (Eg) and hence suffer from low breakdown strength and a huge loss at high temperatures. Here, based on the density functional theory (DFT) calculations, rigid and non-coplanar alicyclic segments are introduced into the polyimide backbone to overcome the incompatibility of a high glass transition temperature (Tg) and large Eg. Thanks to the large optical Eg (∼4.6 eV) and high Tg (∼277 °C), the all-alicyclic polyimide at 200 °C delivers a maximum discharge energy density (Ue) of 5.01 J cm-3 with a charge-discharge efficiency (η) of 78.1% at 600 MV m-1, and a record Ue of 2.55 J cm-3 at η = 90%, which is 10-fold larger than that of the state-of-art commercial polyetherimides (PEIs). In addition, compared with aromatic polyimides, the all-alicyclic polyimide possesses a better self-clearing characteristic due to a smaller ratio of carbon to hydrogen and oxygen, which facilitates its long-term reliability in practical applications.
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Affiliation(s)
- Jinhui Song
- School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China.
| | - Hongmei Qin
- School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China.
| | - Shiyu Qin
- School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China.
| | - Man Liu
- School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China.
| | - Shixian Zhang
- School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China.
| | - Junyu Chen
- School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China.
| | - Yang Zhang
- School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China.
| | - Shan Wang
- School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China.
| | - Qi Li
- State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China.
| | - Lijie Dong
- School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China.
| | - Chuanxi Xiong
- School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China.
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3
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Zhao R, Wu H, Dong X, Xu M, Wang Z, Wang X. Enhancing the Toughness of Free-Standing Polyimide Films for Advanced Electronics Applications: A Study on the Impact of Film-Forming Processes. Polymers (Basel) 2023; 15:polym15092073. [PMID: 37177218 PMCID: PMC10180538 DOI: 10.3390/polym15092073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Revised: 04/23/2023] [Accepted: 04/25/2023] [Indexed: 05/15/2023] Open
Abstract
High-quality and free-standing polyimide (PI) film with desirable mechanical properties and uniformity is in high demand due to its widespread applications in highly precise flexible and chip-integrated sensors. In this study, a free-standing PI film with high toughness was successfully prepared using a diamine monomer with ether linkages. The prepared PI films exhibited significantly superior mechanical properties compared to PI films of the same molecular structure, which can be attributed to the systematic exploration of the film-forming process. The exploration of the film-forming process includes the curing procedures, film-forming substrates, and annealing treatments. Additionally, the thickness uniformity and surface homogeneity of free-standing films were crucial for toughness. Increasing the crystallinity of the PI films by eliminating residual stress also contributed to their high strength. The results demonstrate that by adjusting the above-mentioned factors, the prepared PI films possess excellent mechanical properties, with tensile strength and elongation at break of 194.71 MPa and 130.13%, respectively.
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Affiliation(s)
- Ruoqing Zhao
- Frontiers Science Center for Flexible Electronics (FSCFE), Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University, Xi'an 710072, China
| | - Hao Wu
- Frontiers Science Center for Flexible Electronics (FSCFE), Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University, Xi'an 710072, China
| | - Xuan Dong
- Frontiers Science Center for Flexible Electronics (FSCFE), Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University, Xi'an 710072, China
| | - Manzhang Xu
- Frontiers Science Center for Flexible Electronics (FSCFE), Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University, Xi'an 710072, China
| | - Zhenhua Wang
- Frontiers Science Center for Flexible Electronics (FSCFE), Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University, Xi'an 710072, China
| | - Xuewen Wang
- Frontiers Science Center for Flexible Electronics (FSCFE), Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University, Xi'an 710072, China
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High-Transparency and Colorless Polyimide Film Prepared by Inhibiting the Formation of Chromophores. Polymers (Basel) 2022; 14:polym14194242. [PMID: 36236190 PMCID: PMC9571026 DOI: 10.3390/polym14194242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Revised: 08/31/2022] [Accepted: 09/08/2022] [Indexed: 11/17/2022] Open
Abstract
Colorless polyimides (CPIs) with outstanding mechanical properties are essential materials in the production of flexible display panels, foldable windows, and even spacecraft cockpits. This paper specifically elaborates that the Morkit unit, and azo and nitro chromophores are important factors contributing to yellow PI, together with the well-known charge transfer complex (CTC) theory. Three diamine monomers, two anhydrides monomers, and three blockers were used to inhibit chromophores formation and, thus, obtain CPI films. The cut-off wavelength was blue-shifts to 334 nm and the transmittance is improved to 98.9% in the UV–vis range. Mechanical and thermal properties of the CPI films are not reduced through coupling effects of the blockers. Therefore, the inhibition method of the Morkit units and chromophore groups is a promising process for preparing CPIs to be used as flexible display materials.
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Wang CO, Zhai L, Mo S, Liu Y, Gao MY, Jia Y, He MH, Fan L. Effect of Aggregation Structure on Thermal Expansion Behavior of Polyimide Films with Different Thickness. CHINESE JOURNAL OF POLYMER SCIENCE 2022. [DOI: 10.1007/s10118-022-2785-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Benfridja I, Diaham S, Laffir F, Brennan G, Liu N, Kennedy T. A Universal Study on the Effect Thermal Imidization Has on the Physico-Chemical, Mechanical, Thermal and Electrical Properties of Polyimide for Integrated Electronics Applications. Polymers (Basel) 2022; 14:polym14091713. [PMID: 35566882 PMCID: PMC9101791 DOI: 10.3390/polym14091713] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 04/06/2022] [Accepted: 04/19/2022] [Indexed: 02/01/2023] Open
Abstract
Polyimides (PI) are a class of dielectric polymer used in a wide range of electronics and electrical engineering applications from low-voltage microelectronics to high voltage isolation. They are well appreciated because of their excellent thermal, electrical, and mechanical properties, each of which need to be optimized uniquely depending on the end application. For example, for high-voltage applications, the final polymer breakdown field and dielectric properties must be optimized, both of which are dependent on the curing process and the final physico-chemical properties of PI. The majority of studies to date have focused on a limited set of properties of the polymer and have analyzed the effect of curing from a physicochemical-, mechanical- or electrical-centric viewpoint. This paper seeks to overcome this, unifying all of these characterizations in the same study to accurately describe the universal effect of the cure temperature on the properties of PI and at an industrial processing scale. This paper reports the widest-ranging study of its kind on the effect that cure temperature has on the physico-chemical, mechanical, thermal and electrical properties of polyimide, specifically poly (pyromellitic dianhydride-co-4, 4′-oxydianiline) (PMDA/ODA). The optimization of the cure temperature is accurately studied not only regarding the degree of imidization (DOI), but also considering the entire physical properties. Particularly, the analysis elucidates the key role of the charge–transfer complex (CTC) on these properties. The results show that while the thermal and mechanical properties improve with both DOI and CTC formation, the electrical properties, particularly at high field conditions, show an antagonistic behavior enhancing with increasing DOI while degrading at higher temperatures as the CTC formation increases. The electrical characterization at low field presents an enhancement of the final PI properties likely due to the DOI. On the contrary, at high electric field, the conductivity results show an improvement at an intermediate temperature emphasizing an ideal compromise between a high DOI and PI chain packing when the thermal imidization process is performed over this equilibrium. This balance enables maximum performance to be obtained for the PI film with optimized electrical properties and, overall, optimal thermal and mechanical properties are achieved.
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Affiliation(s)
- Imadeddine Benfridja
- Department of Chemical Sciences, University of Limerick, Limerick V94 T9PX, Ireland;
- Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland; (F.L.); (G.B.); (N.L.)
- LAPLACE Institute, University of Toulouse, Université Paul Sabatier, 31062 Toulouse, France;
| | - Sombel Diaham
- LAPLACE Institute, University of Toulouse, Université Paul Sabatier, 31062 Toulouse, France;
| | - Fathima Laffir
- Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland; (F.L.); (G.B.); (N.L.)
| | - Grace Brennan
- Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland; (F.L.); (G.B.); (N.L.)
- Department of Physics, University of Limerick, Limerick V94 T9PX, Ireland
| | - Ning Liu
- Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland; (F.L.); (G.B.); (N.L.)
- Department of Physics, University of Limerick, Limerick V94 T9PX, Ireland
| | - Tadhg Kennedy
- Department of Chemical Sciences, University of Limerick, Limerick V94 T9PX, Ireland;
- Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland; (F.L.); (G.B.); (N.L.)
- Correspondence:
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Sun M, Wang X, Ye Z, Chen X, Xue Y, Yang G. Highly Thermal Conductive Graphite Films Derived from the Graphitization of Chemically Imidized Polyimide Films. NANOMATERIALS 2022; 12:nano12030367. [PMID: 35159712 PMCID: PMC8840353 DOI: 10.3390/nano12030367] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 01/17/2022] [Accepted: 01/19/2022] [Indexed: 02/01/2023]
Abstract
With the large-scale application and high-speed operation of electronic equipment, the thermal diffusion problem presents an increasing requirement for effective heat dissipation materials. Herein, high thermal conductive graphite films were fabricated via the graphitization of polyimide (PI) films with different amounts of chemical catalytic reagent. The results showed that chemically imidized PI (CIPI) films exhibit a higher tensile strength, thermal stability, and imidization degree than that of purely thermally imidized PI (TIPI) films. The graphite films derived from CIPI films present a more complete crystal orientation and ordered arrangement. With only 0.72% chemical catalytic reagent, the graphitized CIPI film achieved a high thermal conductivity of 1767 W·m−1·K−1, which is much higher than that of graphited TIPI film (1331 W·m−1·K−1), with an increase of 32.8%. The high thermal conductivity is attributed to the large in-plane crystallite size and high crystal integrity. It is believed that the chemical imidization method prioritizes the preparation of high-quality PI films and helps graphite films achieve an excellent performance.
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Affiliation(s)
- Meijiao Sun
- School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China; (M.S.); (X.W.); (Z.Y.); (Y.X.)
| | - Xiaoqiang Wang
- School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China; (M.S.); (X.W.); (Z.Y.); (Y.X.)
| | - Zhengyu Ye
- School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China; (M.S.); (X.W.); (Z.Y.); (Y.X.)
| | - Xiaodong Chen
- Taihu Jinzhang Science & Technology (Anhui) Co., Ltd., Anqing 246000, China;
| | - Yuhua Xue
- School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China; (M.S.); (X.W.); (Z.Y.); (Y.X.)
| | - Guangzhi Yang
- School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China; (M.S.); (X.W.); (Z.Y.); (Y.X.)
- Correspondence: ; Tel.: +86-21-55270632
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Lin D, Jiang M, Li R, Qi S, Wu D. Clarifying the Effect of Drafting Conditions on Structure and Properties of Polyimide Fibers at Molecular Dynamic Level. MACROMOL THEOR SIMUL 2022. [DOI: 10.1002/mats.202100081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Daolei Lin
- State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China
| | - Ming Jiang
- State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China
| | - Runyue Li
- State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China
| | - Shengli Qi
- State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China
- Changzhou Institute of Advanced Materials Beijing University of Chemical Technology Changzhou Jiangsu 213164 China
| | - Dezhen Wu
- State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China
- Changzhou Institute of Advanced Materials Beijing University of Chemical Technology Changzhou Jiangsu 213164 China
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10
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Lin D, Li T, Li R, Qi S, Wu D. Structures and properties of polyimide fibers prepared via gel spinning induced by chemical imidization. POLYMER 2022. [DOI: 10.1016/j.polymer.2021.124377] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Zi Y, Pei D, Wang J, Qi S, Tian G, Wu D. High-Temperature-Induced Shape Memory Copolyimide. Polymers (Basel) 2021; 13:3222. [PMID: 34641038 PMCID: PMC8512334 DOI: 10.3390/polym13193222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 09/09/2021] [Accepted: 09/14/2021] [Indexed: 11/30/2022] Open
Abstract
A series of polyimide (PI) films with a high-temperature-induced shape memory effect and tunable properties were prepared via the facile random copolymerization of 4,4'-oxydianiline (ODA) with 4,4'-(hexafluoroisopropyl)diphthalic anhydride (6FDA) and 4,4'-oxydiphthalic anhydride (ODPA). The trigger temperature can be controlled from 294 to 326 °C by adjusting the ratio of monomers. The effects of monomer rigidity on the chain mobility, physical properties, and shape memory performance of as-prepared copolyimide were systematically investigated. The introduction of ODPA could enhance the mobility of PI macromolecular chains, which made chain entanglement more likely to occur and increased the physical crosslinking density, thereby improving the PI's shape recovery up to 97%. Meanwhile, the existence of 6FDA enabled PI films to set quickly at low temperatures with a shape fixation of 98%. The shape memory cycling characteristics of the polyimide films are also studied, and the relationship between the PI chemical structure and the film properties are further discussed.
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Affiliation(s)
| | | | | | | | - Guofeng Tian
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China; (Y.Z.); (D.P.); (J.W.); (S.Q.); (D.W.)
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Sol-gel transition of polyamic acid solution during chemical imidization and its effect on the drawing behavior of polyimide films. POLYMER 2021. [DOI: 10.1016/j.polymer.2021.123842] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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13
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Clarifying the effect of moisture absorption and high-temperature thermal aging on structure and properties of polyimide film at molecular dynamic level. POLYMER 2021. [DOI: 10.1016/j.polymer.2020.123251] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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