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Lee SJ, Choi MY, Kwac LK, Kim HG, Chang JH. Comparison of Properties of Colorless and Transparent Polyimide Nanocomposites Containing Chemically Modified Nanofillers: Functionalized-Graphene and Organoclay. Polymers (Basel) 2022; 14:polym14122469. [PMID: 35746045 PMCID: PMC9228794 DOI: 10.3390/polym14122469] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 06/14/2022] [Accepted: 06/14/2022] [Indexed: 02/06/2023] Open
Abstract
Poly(amic acid) (PAA) was synthesized from dianhydride 4,4-(4,4-isopropylidenediphenoxy)bis(phthalic anhydride) and diamine bis [4-(3-aminophenoxy) phenyl] sulfone. Colorless and transparent polyimide (CPI) hybrid films were synthesized through thermal imidization after dispersing nanofillers using an intercalation method in a PAA solution. C16-GS and C16-MMT, in which hexadecylamine (C16) was substituted on graphene sheet (GS) and montmorillonite (MMT), respectively, were used as nanofillers to reinforce the CPI hybrid films. These two nanofillers were admixed in varying loadings of 0.25 to 1.00 wt%, and the morphology, thermal properties, and optical transparency of the hybrid films were investigated and compared. The results suggest that the thermal properties of the CPI hybrid films can be improved by adding only a small amount of nanofiller. Transmission electron microscopy results of the CPI hybrid film containing two types of fillers suggested that the fillers were well dispersed in the nano-size in the matrix polymer; however, some of the fillers were observed as agglomerated particles above the critical concentration of 0.50 wt%.
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Affiliation(s)
- Seon Ju Lee
- Graduate School of Carbon Convergence Engineering, Jeonju University, Jeonju 55069, Korea; (S.J.L.); (M.Y.C.); (L.K.K.); (H.G.K.)
| | - Moon Young Choi
- Graduate School of Carbon Convergence Engineering, Jeonju University, Jeonju 55069, Korea; (S.J.L.); (M.Y.C.); (L.K.K.); (H.G.K.)
| | - Lee Ku Kwac
- Graduate School of Carbon Convergence Engineering, Jeonju University, Jeonju 55069, Korea; (S.J.L.); (M.Y.C.); (L.K.K.); (H.G.K.)
- Institute of Carbon Technology, Jeonju University, Jeonju 55069, Korea
| | - Hong Gun Kim
- Graduate School of Carbon Convergence Engineering, Jeonju University, Jeonju 55069, Korea; (S.J.L.); (M.Y.C.); (L.K.K.); (H.G.K.)
- Institute of Carbon Technology, Jeonju University, Jeonju 55069, Korea
| | - Jin-Hae Chang
- Institute of Carbon Technology, Jeonju University, Jeonju 55069, Korea
- Correspondence:
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Silica/Epoxy Hybrid Encapsulation with High Heat-Resistance and Low Coefficient of Thermal Expansion. Macromol Res 2020. [DOI: 10.1007/s13233-020-8135-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Hierarchically structured microgels of SPIONs, nanofibers, and alginate for copper ion removal. J IND ENG CHEM 2019. [DOI: 10.1016/j.jiec.2019.04.052] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Kwon OH, Ha T, Kim DG, Kim BG, Kim YS, Shin TJ, Koh WG, Lim HS, Yoo Y. Anisotropy-Driven High Thermal Conductivity in Stretchable Poly(vinyl alcohol)/Hexagonal Boron Nitride Nanohybrid Films. ACS APPLIED MATERIALS & INTERFACES 2018; 10:34625-34633. [PMID: 30216038 DOI: 10.1021/acsami.8b12075] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Controlling the anisotropy of two-dimensional materials with orientation-dependent heat transfer characteristics is a possible solution to resolve severe thermal issues in future electronic devices. We demonstrate a dramatic enhancement in the in-plane thermal conductivity of stretchable poly(vinyl alcohol) (PVA) nanohybrid films containing small amounts (below 10 wt %) of hexagonal boron nitride ( h-BN) nanoplatelets. The h-BN nanoplatelets were homogeneously dispersed in the PVA polymer solution by ultrasonication without additional surface modification. The mixture was used to prepare thermally conductive nanocomposite films. The in-plane thermal conductivity of the resulting PVA/ h-BN nanocomposite films increased to 6.4 W/mK when the strain was increased from 0 to 100% in the horizontal direction. More specifically, the thermal conductivity of a PVA/ h-BN composite film with 10 wt % filler loading can be improved by up to 32 times as compared to pristine PVA. This outstanding thermal conductivity value is significantly larger than that of materials currently used in in-plane thermal management systems. This result is attributed to the anisotropic alignment of h-BN particles in the PVA chain matrix during stretching, enhancing phonon conductive paths and hence improving the thermal conductivity and thermal properties of PVA/ h-BN nanocomposite films. These polymer nanocomposites have low cost as the amount of expensive conductive fillers is reduced and can be potentially used as high-performance materials for thermal management systems such as heat sink and thermal interface materials, for future electronic and electrical devices.
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Affiliation(s)
- O Hwan Kwon
- Division of Advanced Materials , Korea Research Institute of Chemical Technology , Daejeon 34114 , Republic of Korea
- Department of Chemical and Biomolecular Engineering , Yonsei University , Seoul 03722 , Republic of Korea
| | - Taeyong Ha
- Division of Advanced Materials , Korea Research Institute of Chemical Technology , Daejeon 34114 , Republic of Korea
- Department of Chemical and Biomolecular Engineering , Yonsei University , Seoul 03722 , Republic of Korea
| | - Dong-Gyun Kim
- Division of Advanced Materials , Korea Research Institute of Chemical Technology , Daejeon 34114 , Republic of Korea
- Department of Chemical Convergence Materials , University of Science & Technology , Daejeon 34113 , Republic of Korea
| | - Byoung Gak Kim
- Division of Advanced Materials , Korea Research Institute of Chemical Technology , Daejeon 34114 , Republic of Korea
- Department of Chemical Convergence Materials , University of Science & Technology , Daejeon 34113 , Republic of Korea
| | - Yong Seok Kim
- Division of Advanced Materials , Korea Research Institute of Chemical Technology , Daejeon 34114 , Republic of Korea
- Department of Chemical Convergence Materials , University of Science & Technology , Daejeon 34113 , Republic of Korea
| | - Tae Joo Shin
- UNIST Central Research Facility , Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil , Ulsan 44919 , Republic of Korea
| | - Won-Gun Koh
- Department of Chemical and Biomolecular Engineering , Yonsei University , Seoul 03722 , Republic of Korea
| | - Ho Sun Lim
- Department of Chemical and Biological Engineering , Sookmyung Women's University , Seoul 04310 , Republic of Korea
| | - Youngjae Yoo
- Division of Advanced Materials , Korea Research Institute of Chemical Technology , Daejeon 34114 , Republic of Korea
- Department of Chemical Convergence Materials , University of Science & Technology , Daejeon 34113 , Republic of Korea
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