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Journal articles on the topic 'Polymers Polymers Polyimides'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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1

Wang, Kun Li, Jian Wei Lee, I. Hao Shih, Yi Liang Liu, and En Tang Kang. "Resistive Polymer Memory Materials Containing Electron Donor and Acceptor Moieties." Advanced Materials Research 488-489 (March 2012): 3–7. http://dx.doi.org/10.4028/www.scientific.net/amr.488-489.3.

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Two series of polymers including polyimides and poly(aryl ether)s were prepared and used as active layers of polymer memories. The poly(aryl ether)-based polymers showed flash behaviors and polyimide-based polymers showed WORM behaviors. The poly(aryl ether)s flash memories can be negatively switched on and positively switched off, and the switching voltages are relative to the chemical structure of bisphenol moiety. On the other hand, the polyimide-based polymer devices can be bidirectionally switched on with comparable positive and negative switching threshold voltages, but cannot be switche

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2

Kudaikulova, Saule, Galina Boiko, Bulat Zhubanov, et al. "Blends of Polyimides and Their Morphology." Eurasian Chemico-Technological Journal 6, no. 1 (2016): 17. http://dx.doi.org/10.18321/ectj328.

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The formulation of macromolecular blends on the basis of polyimides using one step catalytic polycyclocondensation is reported. Polymers with active functional groups (polyacrylamide, polycaproamide) have been suggested as catalysts for the reaction of alicyclic dianhydrides with aromatic diamines in protolytic medium. Films made from macromolecular blends of synthesized polymers have been investigated by X-ray diffractometry and scanning electron microscopy. It has been shown that single step formation of polyimide on the polymer matrix presents the possibility to prepare thin structured disp

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3

Didenko, Andrei, Danila Kuznetcov, Gleb Vaganov, et al. "The Thermal Stability and Mechanical Properties of Non-Segregating Blends of Polyimides with Copoly(Urethane-Imide)s." Key Engineering Materials 869 (October 2020): 280–95. http://dx.doi.org/10.4028/www.scientific.net/kem.869.280.

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The series of compositions containing thermodynamically incompatible flexible blocks of aliphatic polyesters and rigid blocks of aromatic bis (urethane) imides in the volume of polymers was obtained on the basis of multiblock (segmented) poly (urethane-imides) and related aromatic polyimides. The series includes segmented poly (urethane-imides) with different relative content of flexible and rigid blocks, non-segregating mixtures of poly (urethane-imides) and thermoplastic partially crystalline polyimide, statistical copolymers of poly (urethane-imide) with imide, and non-segregating mixtures

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4

Gutiérrez, Jon, Andoni Lasheras, Jose Manuel Barandiaran, Jose Luis Vilas, Alberto Maceiras, and Luis Manuel León. "Improving the Performance of High Temperature Piezopolymers for Magnetoelectric Applications." Key Engineering Materials 543 (March 2013): 439–42. http://dx.doi.org/10.4028/www.scientific.net/kem.543.439.

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Piezoelectricity in amorphous polymers is mainly due to the orientation polarization of the molecular dipoles. Aromatic polyimides are high-performance polymeric materials possessing large molecular dipoles. We already reported good magnetoelectric performance of laminate composites with Vitrovac 4040®as magnetostrictive component and the 2,6(b-CN)APB/ODPA (poli 2,6) polyimide as the piezoelectric. Although the piezoelectric response of this polyimide is good, its mechanical properties can be improved. To combine the best mechanical and piezoelectric response in the same polymer, copolyimides

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5

Beltz, Mark W., and Frank W. Harris. "Synthesis and properties of aromatic polyimides containing oxyalkylene linkages." High Performance Polymers 7, no. 1 (1995): 23–40. http://dx.doi.org/10.1088/0954-0083/7/1/003.

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A series of para-catenated aromatic diamines containing oxyalkylene linkages, i.e., i.2-bis(4-aminophenoxy)ethane, bis[2-(4-aminnophenoxy)ethyl]ether, 1,2-bis[24{4-aminio-phenoxy)ethoxyjethane and bis{2-[2A4-aminophenoxy)ethoxy]ethyllether were polymerized with 3,3',4.4'benzophenonetetracarboxylic dianhydride (BTDA) and pyromellitic dianhydride. The poly(amic acid)s obtained were imidized by both chemical and thermal methods. It was postulated that the incorporation of the flexible linkages in the polyimides' backbones would result in solubility in organic solvents and moderate glass transitio

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6

Kozanecka-Szmigiel, Anna, Ewa Schab-Balcerzak, Dariusz Szmigiel, and Jolanta Konieczkowska. "The unexpected photomechanical effect in glassy “T-type” azopolyimides." Journal of Materials Chemistry C 7, no. 14 (2019): 4032–37. http://dx.doi.org/10.1039/c8tc06518g.

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7

Chuang, S. F., T. S. Kuan, and M. Pomerantz. "High-resolution imaging of ordered structure in thin polyimide films." Proceedings, annual meeting, Electron Microscopy Society of America 49 (August 1991): 1052–53. http://dx.doi.org/10.1017/s0424820100089573.

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Polyimides are excellent insulating materials for use in microelectronics because of their high thermal stability, low dielectric constant, good mechanical strength, and resistance to moisture. The molecule main chain of polyimides consists of a rigid, planar structure of aromatic and/or heterocyclic rings. These polymers are usually highly disordered, but local crystallization is feasible between these regular and strongly interacting planar ring groups. In principle, it is possible to synthesize polyimides in crystalline form, with the exception of crosslinked materials, or those with long a

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8

Sobolewska, Anna, Andrzej Miniewicz, Eugenia Grabiec, and Danuta Sek. "Holographic grating recording in azobenzene functionalized polymers." Open Chemistry 4, no. 2 (2006): 266–84. http://dx.doi.org/10.2478/s11532-006-0003-7.

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AbstractA group of 22 polymers have been synthesized to test their suitability for recording holographic gratings. Polyamides, polyimides, polyesters and their combinations were functionalized with pendant azobenzene groups containing single or double N=N. The polymers were studied using a standard degenerate two-wave mixing technique, which enables measurement of light-induced periodic modification of polymer refractive index and absorption coefficient by analysis of the diffracted light. Two qualitatively different configurations of the holographic polarization recording were used, s-s and s

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9

Jang, Steven Lee Hou, Wee Ming Tan, Ying Jun Mao, Ramana Murthy, and Nagarajan Ranganathan. "Gapfill Study of Polyimides for MEMS Applications." Advanced Materials Research 254 (May 2011): 54–57. http://dx.doi.org/10.4028/www.scientific.net/amr.254.54.

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Various types of polyimide have been used widely in the manufacturing of integrated circuits and MEMS’ (Micro Electrical Mechanical Systems) such as sensors. These organic spin-on polymers exhibit a wide range of mechanical and electrical properties and have been commonly used for electrical insulation as well as device passivation and protection. In addition, these organic spin-on polymers serve as excellent sacrificial materials for forming cavities on MEMS structures. This work studies the gapfill properties of several polyimides after spin-coating and curing. In addition, this work examine

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10

Pariser, R. "Polyimides: Versatile Specialty Polymers." Polymer Journal 19, no. 1 (1987): 127–33. http://dx.doi.org/10.1295/polymj.19.127.

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11

SONG, NAIHENG, LIQIU MEN, JIAN PING GAO, GUOMIN YU, ANDREW M. R. BEAUDIN, and ZHI YUAN WANG. "TOWARDS THERMALLY STABLE, HIGHLY ELECTRO-OPTICALLY ACTIVE ORGANIC POLYMERS: DESIGN AND SYNTHESIS OF CROSSLINKABLE POLYIMIDES CONTAINING ZWITTERIONIC NONLINEAR OPTICAL CHROMOPHORES." Journal of Nonlinear Optical Physics & Materials 14, no. 03 (2005): 367–74. http://dx.doi.org/10.1142/s0218863505002803.

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A series of nonlinear optical (NLO) polymers were synthesized by grafting a zwitterionic chromophore onto host acid-containing polyimides with different glass transition temperatures and chain mobility. All the NLO polymers showed good solubility, thermal stability and good film-forming ability. The poling and electro-optic (EO) studies revealed a strong dependence of EO coefficients on the polymer chain mobility or the glass transition temperatures. A new thermally crosslinkable group was introduced into the NLO polymers, in order to achieve high temporal stability of the poled NLO polymers.

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12

Chao, Min. "Synthesis and Characterization of Semicrystalline Polyimides Containing Bridged Linkages." International Journal of Polymer Science 2018 (August 7, 2018): 1–7. http://dx.doi.org/10.1155/2018/8590567.

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A series of polyimides (PI) containing bridged linkages were prepared successfully through a three-step technique. The results indicated that the glass transition temperature (Tg) of polyimides was affected by flexibility of polymer chain and the intermolecular interactions. ODPA-TPER-based polyimide possesses the lowest Tg, which was 214°C. All polyimides had semicrystalline characteristics, and ODPA-TPER-based PI exhibited the lowest melting temperature (Tm) at 316°C. The polyimides had high weight loss temperatures, which indicated that bridged linkages can reduce the softening temperature,

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13

Yamada, Yasuharu. "Siloxane Modified Polyimides for Microelectronics Coating Applications." High Performance Polymers 10, no. 1 (1998): 69–80. http://dx.doi.org/10.1088/0954-0083/10/1/009.

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Two types of siloxane modified polyimide were prepared as coating materials for microelectronics applications and their thermal, mechanical, electrical, adhesive and coating properties were characterized. The coatings prepared were classified as polysiloxane block (type A) polyimides and disiloxane modified (type B) polyimides. All of the polyimides showed excellent thermal, mechanical, electrical, adhesive and coating properties suitable for use in microelectronics coating applications. The type A polyimides have lower dielectric constants and good stress relaxation capability as compared wit

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14

Druzhinina, A. V., M. Sh Suleimenova, O. A. Almabekov, and A. K. Kusainova. "SYNTHESIS OF POLYIMIDES OF ARILACYCLIC STRUCTURE." Chemical Journal of Kazakhstan 74, no. 2 (2021): 124–32. http://dx.doi.org/10.51580/2021-1/2710-1185.34.

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The article describes methods for producing polymeric materials based on tetra-carboxylic acid dianhydrides obtained by photochemical or solar irradiation from furan and maleic anhydride. The procedure of synthesis of aryl-alicyclic polyimides based on 7-оxsоdiciklo (2,2,1)-gepten -2,3- dicarboxylic acid(MAF) and diaminodiphenyl oxide diamines (DADFO) and dioxytriphenyldiamine (DOTFDA) in polar aprotic amide-type solvents has been studied in detail in the presence of a basic catalyst type: trimethyl-amine.The nature and reactivity of staring monomers affect the process of obtaining polyimides.

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15

Ronova, Inga A., Svetlana V. Kryuchkova, Marina Y. Yablokova, et al. "Effect of polymers chemical structure on the membrane characteristics." High Performance Polymers 30, no. 1 (2016): 58–66. http://dx.doi.org/10.1177/0954008316678666.

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The comparative analysis of gas transport properties and conformational parameters of membranes obtained from two polyimides and polysulfone was made. It was shown that the introduction of a sulfone group instead of a methylene group in the amine component of polyimide leads to an increase in glass transition temperature and of polymer membrane permeability coefficient and a reduction in selectivity. Also it was demonstrated that the solvent used during the preparation of polymer membranes had a significant influence on their gas transport characteristics.

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16

Xiao, T. J., S. Q. Gao, A. J. Hu, X. C. Wang, and S. Y. Yang. "Thermosetting Polyimides with Improved Impact Toughness and Excellent Thermal and Thermo-Oxidative Stability." High Performance Polymers 13, no. 4 (2001): 287–99. http://dx.doi.org/10.1088/0954-0083/13/4/307.

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Thermoset polyimides were prepared by thermally curing B-staged endcapped polyimide resins that were obtained by thermally baking PMR polyimide matrix resins. The polyimide matrix resins were prepared by incorporating flexible ether-bridged aromatic segments [–Ar–O–Ar–] into PMR polyimide backbone to improve their processability and impact toughness. Experimental results indicated that the B-staged polyimide resins possessed adjustable and easily controllable thermal processability which ensure that thermoset polyimides are produced with improved impact strength and high glass transition tempe

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17

Lawson, A., and D. C. Sherrington. "Polyimides and other high-temperature polymers." Reactive Polymers 17, no. 3 (1992): 359. http://dx.doi.org/10.1016/0923-1137(92)90283-8.

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18

Kausar, Ayesha. "Nanodiamond reinforcement in polyamide and polyimide matrices: Fundamentals and applications." Journal of Plastic Film & Sheeting 34, no. 4 (2018): 439–58. http://dx.doi.org/10.1177/8756087918773521.

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Nanodiamond is an emerging nanocarbon material having several advantageous properties (high surface area, mechanical properties, optical features, wear resistance, low friction coefficient, etc.) as a nano-sized filler for polymer matrices. Polyamides and polyimides are two important thermoplastic polymers which are among important matrices for nanodiamond composites. Polyamides have high thermal stability, mechanical strength, wear resistance, superior tribological properties, and fine processability. Many aliphatic polyamides, such as polyamide 6, polyamide 6,6, polyamide11, polyamide 12, an

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19

Harris, Frank W., Yoshimitsu Sakaguchi, Mitsuhiro Shibata, and Stephen Z. D. Cheng. "Organo-Soluble Polyimides: Synthesis and Characterization of Polyimides Containing Phenylated p-Biphenyl and p-Terphenyl Units." High Performance Polymers 9, no. 3 (1997): 251–61. http://dx.doi.org/10.1088/0954-0083/9/3/005.

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4, 4′-diamino-2, 2′-diphenylbiphenyl (1), 4,4″-diamino-2′, 3′, 5′-triphenyl- p-terphenyl (2a) and 4,4″-diamino-2′, 3′, 5′, 6′-tetraphenyl- p-terphenyl (2b) have been polymerized with several aromatic dianhydrides in refluxing m-cresol containing isoquinoline to afford a series of phenylated polyimides. The polymerization mixtures of 1 and 3, 3′, 4, 4′-biphenyltetracarboxylic dianhydride (BPDA) and 3, 3′4, 4′-benzophenonetetracarboxylic dianhydride (BTDA) and of 2a and pyromellitic dianhydride (PMDA) set to gel-like structures upon cooling. The gels, which displayed optical anisotropy typical o

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20

Connell, J. W., J. G. Smith, and P. M. Hergenrother. "The Effect of Oxygen Plasma on Some Experimental Polymers Containing Silicon and Phosphorus." Journal of Fire Sciences 11, no. 2 (1993): 137–46. http://dx.doi.org/10.1177/073490419301100203.

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As part of a NASA program on high performance polymers for space applications, polymers containing silicon and phosphorus were prepared, characterized and exposed to an oxygen plasma under vacuum. Thin films of polyimides containing pendent siloxane groups, thermosetting resins contain ing silicon and poly(arylene ether)s containing phenylphosphine oxide were ex posed to a radio frequency generated oxygen plasma to assess their stability. The weight loss of the films was monitored as a function of exposure time and compared with that of Ultem® and Kapton® polyimide films of the same thick ness

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21

Akimoto, Satoshi, Mitsutoshi Jikei, and Masa-aki Kakimoto. "Preparation and Properties of Novel Aromatic Polyimides from 4,4′-Diamino-4″ -Hydroxytriphenylamine and Aromatic Tetracarboxylic Dianhydrides." High Performance Polymers 12, no. 1 (2000): 197–203. http://dx.doi.org/10.1088/0954-0083/12/1/316.

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Novel aromatic polyimides containing hydroxytriphenylamine units were prepared from 4,4′-diamino-4″-hydroxytriphenylamine 1 and various aromatic tetracarboxylic dianhydrides 2. The glass transition temperatures ( Tgs) of these polyimides were in the range of 274–388 °C and the 10% weight loss temperatures ( T d10s) were above 462 and 511 °C in air and nitrogen respectively. Polyimide 4f prepared from diamine 1 and 4,4′-hexafluoroisopropylidenebis(phthalic anhydride) (6FDA) was soluble not only in organic solvents such as N-methyl-2-pyrrolidone, N, N-dimethylacetamide, N, N-dimethylformamide, 1

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22

Schab-Balcerzak, E., D. Sek, E. Grabiec, A. Volozhin, and T. Chamenko. "New Polyimides as Precursors for Functionalized Polymers." High Performance Polymers 13, no. 1 (2001): 35–44. http://dx.doi.org/10.1088/0954-0083/13/1/304.

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23

Bes, L., A. Rousseau, B. Boutevin, R. Mercier, B. Sillion, and E. Toussaere. "Synthesis and Characterization of Aromatic Polyimides Bearing Nonlinear Optical Chromophores." High Performance Polymers 12, no. 1 (2000): 169–76. http://dx.doi.org/10.1088/0954-0083/12/1/313.

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The syntheses and characterizations of two aromatic polyimides with nonlinear optical (NLO) chromophore side chains were investigated through a two-step synthetic route. These two polymers were prepared by polycondensation of 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) with 4-(4-amino, 2-hydroxy) phenoxyaniline (HODA) and 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane (6FAP), respectively. First the poly(hydroxy)imides were prepared by direct thermal imidization. The resulting polyimides bearing hydroxy groups were found to react easily with the terminal hydroxy group of the

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24

BAS, CORINE, N. DOMINIQUE ALBÉROLA, MARIE-FRANCE BARTHE, JÉRÉMIE De BAERDEMAEKER, and CHARLES DAUWE. "POSITRON INTERACTION IN POLYMERS." International Journal of Modern Physics A 19, no. 23 (2004): 3951–59. http://dx.doi.org/10.1142/s0217751x04020208.

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A series of dense copolyimide membranes was characterized using positron annihilation spectroscopy. The positron annihilation lifetime spectroscopy performed on film with a classical positron source gives informations on the positronium fraction formed and also on the hole size within the film. The Doppler broadening spectra (DBS) of the gamma annihilation rays coupled with a variable energy positron beam allow the microstructural analyses as a function of the film depth. Experimental data were also linked to the chemical structure of the polyimides. It was found that the presence of the fluor

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25

Akinyi, Caroline, Jimmy Longun, Siqi Chen, and Jude O. Iroh. "Decomposition and Flammability of Polyimide Graphene Composites." Minerals 11, no. 2 (2021): 168. http://dx.doi.org/10.3390/min11020168.

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Polyimide-graphene composites were synthesized by in-situ condensation polymerization and the thermal stability and decomposition behavior of the composites were studied. Polyimides, because of their aromatic backbone, are a class of fire-retardant polymers. Their high char retention ≥50% at testing temperatures ≥600 °C makes them thermally stable polymers. The effect of nanographene sheets on the decomposition behavior of polyimide is presented in this paper. It is shown that the reinforcement of polyimide with nanographene sheets significantly decreased the rate of decomposition of polyimide

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26

Matseevich, Tat’yana Anatol’evna, Marina Nikolaevna Popova, and Andrey Aleksandrovich Askadskiy. "Glass transition temperature and elastic modulusof nanocomposites based on polyimides." Vestnik MGSU, no. 6 (June 2015): 50–63. http://dx.doi.org/10.22227/1997-0935.2015.6.50-63.

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Today great attention is paid to production and research of the mechanical and termal properties of nanocomposites based on polyimides. These polymers are heatresisting and possess the increased mechanical properties in wide range of temperatures. Various nanoparticles are introduced into polyimides: graphite nanotubes and flatparticles, the particles of SiO , the surface of which is modified, the particles of ZrOandmontmorillonite, etc.The authors analyzed the influence of nanoparticles on the glass transition temper-ature T and elastic modulus E of the polyimides based on 1,3-bis-(3,3’,4,4’-

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27

Chen, Ying, Rumin Huang, Qiuyu Zhang, Wanlu Sun, and Xiaobo Liu. "Synthesis and properties of highly soluble branched polyimide based on 2,4,6-triaminopyrimidine." High Performance Polymers 29, no. 1 (2016): 68–76. http://dx.doi.org/10.1177/0954008315627854.

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A series of novel soluble polyimides was synthesized from commercially available 2,4,6-triaminopyrimidine (TAP), 2,2-bis(3,4-dicarboxylphenyl) hexafluoropropane dianhydride (6FDA), α,ω-aminopropylpoly(dimethylsiloxane) and 1,3-bis(3-aminophenoxy)benzene. TAP is the branched monomer, and polymerization process had been improved in three ways by using TAP to prepare soluble polyimides. The polyimides were characterized by Fourier transform infrared spectra, proton nuclear magnetic resonance, ultraviolet–visible spectrometer analysis, wide-angle X-ray diffraction, and size-exclusion chromatograph

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28

Maier, Gerhard, Dazhong Yang, Martin Wolf, and Oskar Nuyken. "Soluble poly(imide)s based on the phenylindane structure element." High Performance Polymers 6, no. 4 (1994): 335–46. http://dx.doi.org/10.1088/0954-0083/6/4/004.

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This paper describes the synthesis and characterization of several poly(imide)s containing different phenylindane structural elements. A comparison with known polymers of similar structure but no indane rings reveals the influence of the presence of the indane system on polymer properties. In general, solubility is improved and the glass transition temperature is increased by the introduction of the bulky indane groups. Crystallization of the polymer chains is prevented by the presence of 1,1,3-trimethylindane units. Variation of the indane structure itself allows some adjustment of the solubi

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29

Ji, Xiaodong, Jingling Yan, Xiuju Liu, Zikun Wang, and Zhen Wang. "Synthesis and properties of polyimides derived from bis(4-aminophenyl)isohexides." High Performance Polymers 29, no. 2 (2016): 197–204. http://dx.doi.org/10.1177/0954008316634443.

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Several partially bio-based polyimides have been successfully synthesized by polycondensation between bis(4-aminophenyl)isohexides with various commercial dianhydrides. Flexible and free-standing films were readily obtained from their poly(amic acid) or polyimide solutions. A systematic investigation of the structure–property relationship of polyimides highlights the significant impact of the isohexides moieties on their physical and mechanical properties (glass transition temperature, inherent viscosity, thermal stability, solubility, and mechanical properties). The results revealed that thes

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30

Jung, Cheolsoo, Tetsuya Aoyama, Tatsuo Wada, Hiroyuki Sasabe, Mitsutoshi Jikei, and Masa-Aki Kakimoto. "The Photorefractive Effect in Monolithic Structural Polyimides." High Performance Polymers 12, no. 1 (2000): 205–12. http://dx.doi.org/10.1088/0954-0083/12/1/317.

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We report here the photorefractive effect in monolithic structural polyimides containing the triphenylamino-( p-nitrophenyl)-ethylene group as a nonlinear optical (NLO) chromophore and hole transfer. Three types of polyimides were synthesized to control the loading ratio of the NLO chromophore; 50, 30 and 17 mol% for polyimides 1, 2 and 3 respectively. In the two-beam coupling experiment, asymmetric energy transfer was observed in the case of polyimides 1 and 2, providing evidence for a phaseshifted grating after corona-poling treatment, whereas the energy transfer of polyimide 3 was not obser

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31

Hsiao, Sheng-Huei, and Kai-Han Lin. "Synthesis and properties of electroactive aromatic polyimides with methyl- or trifluoromethyl-protecting triphenylamine units." High Performance Polymers 29, no. 5 (2016): 544–55. http://dx.doi.org/10.1177/0954008316653456.

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Two series of new redox-active aromatic polyimides with methyl- (–CH3) or trifluoromethyl (–CF3)-protecting triphenylamine moieties were prepared from 4,4′-diamino-4″-methyltriphenylamine and 4,4′-diamino-4″-(trifluoromethyl)triphenylamine with aromatic tetracarboxylic dianhydrides via the conventional two-step polycondensation technique. Flexible and strong polyimide films could be obtained via the thermal curing of their precursor poly(amic acid) films or direct solution cast from some organosoluble polyimides. The polyimides showed high glass-transition temperatures between 269°C and 312°C,

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32

Barzic, Andreea Irina, Raluca Marinica Albu, Emil Ghiocel Ioanid, and Camelia Hulubei. "Molecular design of some semi-alicyclic polyimides as a route to improve refraction and dielectric properties for liquid crystal display applications." High Performance Polymers 30, no. 7 (2017): 776–86. http://dx.doi.org/10.1177/0954008317726358.

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The study establishes an adequate monomer combination for achieving the best balance of properties required in obtaining polyimide alignment layers for display devices. The molecular design of some aliphatic/aromatic polyimides was performed by using dianhydride monomers with distinct configurations in terms of rigidity, size, and symmetry. The polyimides based on semi-flexible and nonsymmetric dianhydride moieties present lower refractive index and dielectric constant (<3) than those obtained from symmetric and rigid dianhydride units. This determines faster traveling of visible and microw

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33

Song, Ningning, Tianjiao Wang, Hongyan Yao, et al. "Construction and carbon dioxide capture of microporous polymer networks with high surface area based on cross-linkable linear polyimides." Polymer Chemistry 10, no. 33 (2019): 4611–20. http://dx.doi.org/10.1039/c9py00100j.

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Microporous polyimide networks with high surface area and excellent CO<sub>2</sub> adsorption performance have been constructed based on cross-linkable linear polyimides through crosslinking reaction.

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34

Khalili, Sedigheh, and Zahra Rafiee. "Synthesis and properties of highly organosoluble aromatic polyimides containing N-(4-(di(1H-indole-3-yl)methyl)phenyl) moieties." High Performance Polymers 32, no. 1 (2019): 83–90. http://dx.doi.org/10.1177/0954008319853031.

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A new diamine monomer containing indole unit, 3,5-diamino- N-(4-(di(1H-indol-3-yl)methyl)phenyl)benzamide, was successfully synthesized and applied in the preparation of a series of polyimides (PIs) via a conventional two-step polymerization procedure with three aromatic tetracarboxylic dianhydrides. The prepared polymers showed excellent solubility in organic solvents such as N-methyl-2-pyrrolidinone (NMP), N, N-dimethylacetamide, and N, N-dimethylformamide. Flexible and strong films of PIs were obtained via casting from their solutions. The glass transition temperature of these polymers was

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35

Li, Yu Han. "A Study of Linear versus Kinked Bulky Polymers for Proton Exchange Membranes Using Sulfonated Polyimides." Applied Mechanics and Materials 670-671 (October 2014): 133–36. http://dx.doi.org/10.4028/www.scientific.net/amm.670-671.133.

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Linear and kinked bulky monomers were incorporated into the main chain of a polyimide in order to investigate the effect of kinked versus linear polymers on membrane properties such as water uptake and proton conductivity. Polymers prepared using linear 1,4-bis (4-aminophenoxy)-naphthyl-2,7-disulfonic acid (BAPNDS), SPI-N, and using kinked 2,2’-bis (p-aminophenoxy)-1,1’-binaphthyl-6,6’-disulfonic acid (BNDADS), SPI-BN, were cast into membranes. All the copolymers showed excellent solubility and good film-forming capability. Membranes are thermally stable up to 300 °C under air. For SPI-BN, the

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Ritter, Nicola, Irena Senkovska, Stefan Kaskel, and Jens Weber. "Towards Chiral Microporous Soluble Polymers-Binaphthalene-Based Polyimides." Macromolecular Rapid Communications 32, no. 5 (2011): 438–43. http://dx.doi.org/10.1002/marc.201000714.

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Imai, Yoshio. "High pressure synthesis of polyimides and related polymers." Macromolecular Symposia 122, no. 1 (1997): 55–61. http://dx.doi.org/10.1002/masy.19971220110.

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Zhang, Yixiang, Masahiko Miyauchi, and Steven Nutt. "Structure and properties of a phenylethynyl-terminated PMDA-type asymmetric polyimide." High Performance Polymers 31, no. 3 (2018): 261–72. http://dx.doi.org/10.1177/0954008318762592.

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A new polymerized monomeric reactant (PMR)-type polyimide, designated TriA X, was investigated to determine polymer structure, processability, thermal, and mechanical properties and establish the relationship between the molecular structure and those properties. TriA X is a PMR-type polyimide with an asymmetric, irregular, and nonplanar backbone. Both the imide oligomers and the cross-linked polyimides of TriA X exhibited loose-packed amorphous structures, independent of thermal processing. The peculiar structures were attributed to the asymmetric backbone, which effectively prevented the form

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39

Takeichi, Tsutomu, Kohji Nakajima, Min Zuo, and Rikio Yokota. "Polyimide/Polyimide Molecular Composite Films: Difference between Reactive Oligoimide and Reactive Polyimide as the Matrix Component." High Performance Polymers 10, no. 1 (1998): 111–20. http://dx.doi.org/10.1088/0954-0083/10/1/012.

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Polyimide/polyimide molecular composite (MC) films were prepared by blending precursor solutions of a rigid polyimide and a reactive oligoimide or a reactive polyimide that contains acetylene units in the backbone in a 7:3 ratio, followed by casting, drying and thermal imidization at 300 °C. 3, 3′, 4, 4′-Biphenyltetracarboxylic dianhydride (BPDA), pyromellitic dianhydride (PMDA), p-phenylenediamine (PDA), oxydianiline (ODA) and 3, 3′-diaminodiphenylacetylene ( m-intA) were used as acid dianhydride and diamine monomers for the preparation of polyimide. The rigid components were prepared from PM

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40

Prelipceanu, Otilia-Sanda, Marius Prelipceanu, Nicolae Paraschiv, Alexandru Popa, and Oana Geman. "Investigations of Novel High-Temperature Resistant Polymers for Electro-Optical Applications in Signal Processing Systems." Symmetry 11, no. 1 (2019): 60. http://dx.doi.org/10.3390/sym11010060.

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In this paper the novel high-temperature resistant polymers with nonlinear optical properties have been synthesized, characterized and tested for use in electro-optical components with high bit rate optical signal processing systems and for dynamic holography. The characterization that has been reported include the measurement of second-order nonlinear susceptibility by second harmonic generation, UV-VIS spectroscopy, XRD measurement dielectric relaxation, glass transition temperature and molecular weight distribution before and after artificial ageing. Also, we have done AFM investigations an

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Hsiao, Sheng-Huei, and Ying-Hsiu Hsiao. "Synthesis and electrochemical properties of new redox-active polyimides with (1-piperidinyl)triphenylamine moieties." High Performance Polymers 29, no. 4 (2016): 431–40. http://dx.doi.org/10.1177/0954008316648005.

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A series of new electroactive aromatic polyimides with (1-piperidinyl)triphenylamine moieties were prepared from 4,4′-diamino-4″-(1-piperidinyl)triphenylamine and aromatic tetracarboxylic dianhydrides via the conventional two-step polycondensation technique. Flexible and strong polyimide films could be obtained via the thermal curing of their precursor poly(amic acid) films. The polyimides showed high glass transition temperatures between 288°C and 318°C, and they did not show significant decomposition before 500°C in air or nitrogen atmosphere. Cyclic voltammograms of the polyimide films on t

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Askadskii, Andrey A., Sergey V. Matseevich, and Tat’yana A. Matseevich. "Selection of structural elements of cross-linked polymers used in construction." Vestnik MGSU, no. 3 (March 2021): 347–59. http://dx.doi.org/10.22227/1997-0935.2021.3.347-359.

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Introduction. For the first time, a model and a principle for constructing an appropriate computer program for the selection of polymer networks with a given interval of a number of physical characteristics are proposed. These characteristics include density, the temperature of the onset of intense thermal degradation, thermal conductivity, water permeability, and the stress-optical coefficient. As an example, 16 smallest base fragments are given, which, when attached to each other, allow the selection of structural fragments of repeating fragments of polymers of the following classes: polyole

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Khosa, Muhammad Kaleem, Muhammad Asghar Jamal, Rubbia Iqbal, and Mazhar Hamid. "Synthesis and Characterization of Novel Processable and Flexible Polyimides Containing 3,6-Di(4-carboxyphenyl)pyromellitic Dianhydride." Advances in Chemistry 2014 (September 10, 2014): 1–10. http://dx.doi.org/10.1155/2014/759594.

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A series of six novel polyimides containing 3,6-di(4-carboxyphenyl)pyromellitic dianhydride were synthesized via two steps condensation method. Aromatic diamines monomers, 4-(4-aminophenoxy)-N-(4-(4-aminophenoxy)benzylidene)-3-chloroaniline (DA1), 4-(4-amino-3-methylphenoxy)-N-(4-(4-amino-3-methylphenoxy)benzylidene)-3-chloroaniline (DA2), 4-(4-amino-2-methylphenoxy)-N-(4-(4-amino-2-methylphenoxy)benzylidene)-3-chloroaniline (DA3) 4-(4-aminophenoxy)-N-(4-(4-aminophenoxy)benzylidene)-2-methylaniline (DA4), 4-(4-amino-3-methylphenoxy)-N-(4-(4-amino-3-methylphenoxy)benzylidene)-2-methylaniline (D

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44

Journal, Baghdad Science. "Synthesis of some polyimides by different methods." Baghdad Science Journal 2, no. 3 (2005): 460–70. http://dx.doi.org/10.21123/bsj.2.3.460-470.

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Journal, Baghdad Science. "Synthesis of some polyimides by different methods." Baghdad Science Journal 2, no. 3 (2021): 460–70. http://dx.doi.org/10.21123/bsj.2005.2.3.460-470.

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Zhou, Zhuxin, Wenxiu Huang, Yubo Long, et al. "An oxidation-induced fluorescence turn-on approach for non-luminescent flexible polyimide films." Journal of Materials Chemistry C 5, no. 33 (2017): 8545–52. http://dx.doi.org/10.1039/c7tc01894k.

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47

Behniafar, Hossein, Saeed Khosravi-Borna, and Parvaneh Boland. "Novel Modified Aromatic Polyamides and Polyimides Derived from a Diphenyl Ether-Based Diamine Containing Laterally-Attached Phenoxy Phenylene Groups." Advanced Materials Research 93-94 (January 2010): 255–58. http://dx.doi.org/10.4028/www.scientific.net/amr.93-94.255.

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In this research a new structurally-modified monomer, 2,2'-bis[(p-phenoxy phenyl)]-4,4'-diaminodiphenyl ether (PPAPE) was synthesized by a three-step manner starting from 4,4'-dinitrodiphenyl ether. Novel classes of wholly aromatic polyamides and polyimides were prepared from PPAPE through the conventional polycondensation reactions including triphenyl phosphate-activated phosphorylation method for the preparation of the polyamides and cyclodehydration of in situ-formed polyamic acid precursors for the preparation of the polyimides. n and w values were determined by GPC measurements. Crystalli

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Kato, M., T. Yamaoka, R. Hurditch, and H. Honda. "Editorial—Photosensitive polyimides." Polymers for Advanced Technologies 4, no. 4 (1993): 215. http://dx.doi.org/10.1002/pat.1993.220040401.

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Imai, Yoshio. "Synthesis of novel organic-soluble high-temperature aromatic polymers." High Performance Polymers 7, no. 3 (1995): 337–45. http://dx.doi.org/10.1088/0954-0083/7/3/010.

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This paper reviews our current work on the synthesis of new organic-soluble aromatic polyamides and polyimides having high glass transition temperatures above 300 °C. Our strategy to achieve this goal is to introduce a bulky pendant phenyl group along the polymer backbone and to incorporate a crank and twisted non-coplanar structure into the polymer main chain.

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50

Hay, J. N., B. Woodfine, and M. Davies. "Toughening of Epoxy Resins by Polyimides Synthesized from Bisanilines." High Performance Polymers 8, no. 1 (1996): 35–56. http://dx.doi.org/10.1088/0954-0083/8/1/003.

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A range of thermoplastic polyimides has been synthesized and used to modify a DGEBA-DDS epoxy thermoset. The influence of polyimide end-group functionality and particle size has been examined. Increases in fracture toughness of up to three times that of the neat resin have been achieved, together with no loss of modulus. Thermal capability is little affected across the range of modifying polyimides. The influence of copoly(imide–imide)s has also been studied. Morphological examination has revealed a range of structures in the blends, including some which are unusual. A particulate toughening m

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