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Chinese Journal of Polymer Science 2014年第8期32卷 1052-1059页

作者： Xiao-juan Li Lu Chen Wei Huang Xiang Li Chao-liang Zhang 刘习奎 College of Polymer Science and Engineering Sichuan University State Key Laboratory of Oral Diseases West China Hospital of Stomatology Sichuan University

A green approach to the synthesis and morphological control of high performance polyimides and their nanohybrid shish-kebabs in glycerol through reaction-induced crystallization of nylon-salt-type monomers was reported. Crystalline polyimide nanoplates can be observed by direct polycondensation of pyromellitic acid with various kinds of aliphatic or aromatic diamines. With the existence of carbon nanotuhes, the polyimides can be successfully decorated on the surface of CNTs through a reaction-induced hetero-epitaxial crystallization process, and resulted in novel polyimide/CNT nanohybrid shish-kebabs （NHSKs） structures. The morphologies of the NHSKs can be fine-tuned through changing the concentration of monomers or the reaction temperature, especially through the introduction of dynamic imine chemistry, the formation process of NHSKs can be attributed to a soft epitaxy mechanism. Thus a green approach for the synthesis of high performance polyimides and their CNT based nanohybrid structures was explored, which should be of great value for their applications in high performance reinforced nanocomposites.

关键词： polyimides Reaction-induced crystallization Nanohybrid shish-kebabs Green synthesis.

polyimides as Promising Materials for Lithium-Ion Batteries:A Review

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Nano-Micro Letters 2023年第9期15卷 74-102页

作者： Mengyun Zhang Li Wang Hong Xu Youzhi Song Xiangming He Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084People’s Republic of China

Lithium-ion batteries(LIBs)have helped revolutionize the modern world and are now advancing the alternative energy *** technical challenges are associated with LIBs,such as increasing their energy density,improving their safety,and prolonging their *** by these issues,researchers are striving to find effective solutions and new materials for next-generation *** play a more and more important role in satisfying the ever-increasing requirements for ***(PIs),a special functional polymer,possess unparalleled advantages,such as excellent mechanical strength,extremely high thermal stability,and excellent chemical inertness;they are a promising material for ***,we discuss the current applications of PIs in LIBs,including coatings,separators,binders,solid-state polymer electrolytes,and active storage materials,to improve high-voltage performance,safety,cyclability,flexibility,and *** technical challenges are described,and strategies for solving current issues are ***,potential directions for implementing PIs in LIBs are outlined.

关键词： polyimides Separators Binders Solid-state electrolytes Lithium-ion

Fluorine Substitution Effect on the Material Properties in Transparent Aromatic polyimides

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Chinese Journal of Polymer Science 2022年第7期40卷 781-788页

作者： Wei-Feng Peng Huan-Yu Lei Xin-Xin Zhang Lu-Hao Qiu Ming-Jun Huang South China Advanced Institute for Soft Matter Science and Technology School of Emergent Soft MatterSouth China University of TechnologyGuangzhou510640China Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices South China University of TechnologyGuangzhou510640China

The recent development of flexible display technology raised additional requirements for optical and electric properties of polyimides,accelerating the structure and property tunning of transparent *** unique electronic effect and steric hindrance effect of fluorine substitutions make fluorine-containing polyimides occupy an important position in the transparent polyimide *** this work,a series of transparent aromatic polyimides were prepared from a fixed 4,4’-(hexafluoroisopropylidene)diphthalic anhydride(6FDA)and biphenyl diamines with different substitute groups at the 2,2’,6,6’-*** systematically studied the effects of pendant groups on the thermal,mechanical,optical and dielectric properties of these 6FDA-based polyimides with the aid of density function theory(DFT)*** particular,we paid special attention to the simple but compact fluoro group *** simple fluoro substitution brought the advantages of maintaining the linearity of the backbone and dense polymer chain packing,which would minimize the weakening of polyimides’inherent thermal,dimensional and mechanical *** with trifluoromethyl substituted polyimides with the best optical transparency,polyimides containing fluoro substitutes exhibited slightly decreased optical transparency,but increased thermal and dimensional stability and higher mechanical *** results could shed light on the ultimate transparent polyimide film development toward the application in extreme working condition,e.g.,the colorless polyimide substrate film for the flexible display technology.

关键词： polyimides Fluorine substitution Transparent Dielectric Colorless

ORGANOSOLUBLE AND THERMALLY STABLE polyimides DERIVED FROM A NEW DIAMINE CONTAINING BULKY-FLEXIBLE TRIARYL PYRIDINE PENDENT GROUP

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Chinese Journal of Polymer Science 2011年第4期29卷 465-474页

作者： Mousa Ghaemy Soheila Khajeh Faculty of Chemistry University of MazandaranBabolsarIran

A novel kind of aromatic diamine, N-（4-（4-（2,6-diphenyl pyridine-4-yl） phenoxy） phenyl）-3,5-diaminobezamide （DPDAB）, was synthesized via aromatic nucleophilic substitution of 3,5-dinitrobenzoylchloride with 4-（4-（2,6- diphenylpyridine-4-yl）phenoxy）aniline （DPPA）, followed by palladium-catalyzed hydrazine reduction. This monomer was used to prepare polyimides （PIs） based on reaction with several commerically avaiable tetracarboxylic dianhydrides such as pyromellatic dianhydride （PMDA）, benzophenone tetracarboxylic acide dianhydride （BTDA） and bicycle [2.2.2] oct-7-ene- 2, 3,5,6-tetracarboxylic dianhydride （BCDA）. These PIs had inherent viscosity in the range of 0.34-0.76 dL/g and showed good solubility in various aprotic polar solvents. The glass-transition tempratures （Tgs） of the PIs were in the range of 184-302℃, and showed high thermal stability with 10% weight loss in the temperature range of 360-500℃ under nitrogen atmosphere.

关键词： polyimides Inherent viscosity Solubility Thermal stability DSC.

Aromatic polyimides with Tertbutyl-substituted and Pendent Naphthalene Units:Synthesis and Soluble,Transparent Properties

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Chinese Journal of Polymer Science 2015年第8期33卷 1074-1085页

作者： Chan-juan Liu Mei Mei Xiang-lin Pei 黄孝华 Chun Wei Key Laboratory of New Processing Technology for Nonferrous Metal & Materials Ministry of Educationand School of Material Science and EngineeringGuilin University of Technology Ministry of Education Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources School of Chemistry and Pharmaceutical ScienceGuangxi Normal University

A novel non-coplanar aromatic diamine monomer, 3,3＇-ditertbutyl-4,4＇-diaminodiphenyl-4＂-naphthylmethane （TAPN） was synthesized by a condensation reaction of 2-tertbutylaniline and 1-naphthaldehyde under catalyst hydrochloric acid. The structure of the monomer was confirmed by FTIR, NMR, elementary analysis and mass spectrometry. A series of aromatic polyimides （PIs） were synthesized via conventional one-step polycondensation from TAPN and various commercial aromatic dianhydrides. All of the PIs exhibit excellent solubility in common organic solvents, even in low boiling point solvents such as chloroform （CHC13）, tetrahydrofuran （THF） and acetone. The PIs present outstanding thermal stability with the glass transition temperature （Tg） ranged from 299 ℃ to 350 ℃, and the temperature at 10% weight loss ranged from 490 ℃ to 504 ℃, and high optical transparency with the cutoff wavelengths of 306-356 nm. Moreover, the flexible and tough PI films have prominent mechanical properties with tensile strengths in the range of 77.6-90.5 MPa, tensile modulus in the range of 1.8-2.4 GPa and elongation at break in the range of 6.3%-9.5%, as well as lower dielectric constant （2.89-3.12 at 1 MHz） and lower moisture absorption （0.35%-0.66%）.

关键词： polyimides Solubility Dielectric constant Tertbutyl Naphthyl.

Highly Soluble polyimides Containing Di-tert-butylbenzene and Dimethyl Groups with Good Gas Separation Properties and Optical Transparency

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Chinese Journal of Polymer Science 2020年第7期38卷 759-768,I0007页

作者： Chen-Yi Wang Cai-Rong Jiang Bin Yu Xiao-Yan Zhao Zhao-Liang Cui Jian Li Qiang Ren Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Jiangsu Key Laboratory of Environmentally Friendly Polymeric MaterialsSchool of Materials Science and EngineeringChangzhou UniversityChangzhou 213164China State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 210009China

A rigid aromatic diamine monomer containing di-tert-butylbenzene and dimethyl groups,3,3'-dimethyl-4,4'-diaminophenyl-3",5"-di-tert-butyltoluene,was successfully synthesized by a simple coupling reaction using 3,5-di-tert-butylbenzaldehyde and o-toluidine as starting materials.A series of novel polyimides(PI 3a-3c)with large pendant groups were prepared with the obtained diamine monomer and three different commercial aromatic dianhydrides(3,3',4,4'-biphenyltetracarboxylic dianhydride,4,4'-oxydiphthalic anhydride,and 4,4'-(hexafluoroisopropylidene)diphthalic anhydride)by one-step high temperature *** prepared polyimides exhibited high solubility and good membrane forming ability:they could be dissolved not only in some high boiling solvents such as DMF,NMP,DMAc,and m-Cresol at room temperature,but also in some low boiling solvents such as CHCl3,CH2Cl2,and *** solubility in most solvents could exceed 10 wt%,and the flexible membranes could be obtained by casting their *** prepared membranes exhibited good gas separation *** permeability coefficients of PI 3c for CO2 and O2 were up to 124.6 and 42.8 barrer,respectively,and the selectivity coefficients for CO2/CH4 and O2/N2 were 14.7 and 3.3,*** membranes had light color and good optical *** optical transmittance at 450 nm wavelength was in the range of 67%-79%,and the cutoff wavelength was in the range of 310-348 *** also had good thermal properties with glass transition temperature(Tg)values in the range of 264-302℃.In addition,these membranes possessed good mechanical properties with tensile strength ranging between 77.8-87.4 MPa,initial modulus ranging between 1.69-1.82 GPa,and elongation at break ranging between 4.8%-6.1%.

关键词： polyimides Di-tert-butyltoluene Gas separation performance Optical transparency

A MOLECULAR APPROACH TO THE SYNTHESIS OF NOVEL polyimides

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Chinese Journal of Polymer Science 1999年第6期17卷 511-528页

作者：王植源 Department of Chemistry Carleton University 1125 Colonel by Drive Ottawa Canada KIS 5B6

In the past ten years there has been a flurry of activity in the synthesis of new specialty polymers,largely as a result of the increased need for high technology materials. Interest is mainly shown in two distinctcategories of polymers: a) polymers which are used in very small quantities to fulfill critical needs as a part ofdevice systems, and b) high-performance engineering polymers which significantly extend their mechanicaland thermal properties for structural applications. polyimides and their unparalleled versatility have capturedthe attention and imagination of scientists and engineers. This article describes some of the recent work doneby the author's group on the rational design at the molecular level and the synthesis of polyimides that haveunusual structures and novel properties.

关键词： polyimides Poly(aryl prehnitimide)s AB-type monomer Solid-state polymerization

Synthesis and Characterization of polyimides Based on Twisted Non-coplanar Backbone Containing Indolocarbazole

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Chinese Journal of Structural Chemistry 2021年第12期40卷 1611-1620,1552页

作者： WANG Ting SU Yu-Miao CHEN Feng LI Wen-Mu Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China University of Chinese Academy of Sciences Beijing 100049China Fujian Provincial Key Laboratory of Featured Materials in Biochemical Industry Fujian Province University Key Laboratory of Green Energy and Environment CatalysisCollege of Chemistry and MaterialsNingde Normal UniversityNingde 352100China Innovation Academy for Green Manufacture Chinese Academy of SciencesBeijing 100190China

A diamine monomer(4,4’-(((5,11-dihydroindolo[3,2-b]carbazole-6,12-diyl)bis(4,l-phenyl-ene))bis(oxy))dianiline)containing a rigid conjugated indolocarbazole was designed and synthesized through a three-step reaction.A series of high-performance functional polyimides were prepared through simple condensation polymerization of the monomer with different industrial dianhydrides 6FDA,BTDA and ODPA,respectively,which exhibit superior thermal stability,good solubility in polar organic solvents and good mechanical *** glass transition temperature(T_(g))is above 334℃,and the 5%weight loss temperature(T_(d5%))of polyimides under nitrogen atmosphere falls in the range of 502〜526℃.The tensile strength and tensile modulus are 49.45~60.08 MPa and 1.4-1.6 GPa,*** addition,the maximum fluorescence emission wavelength of polyimides in the NMP solution(0.02 mg/mL)are around 448 nm with blue light emission and 451 nm as film without significant red shift,which indicates the prepared polyimides process a certain application potential in high-performance flexible polymer optoelectronic devices.

关键词： polyimides indolocarbazole thermal stability

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Novel Non-Coplanar and Tertbutyl-Substituted polyimides:Solubility,Optical,Thermal and Dielectric Properties

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Chinese Journal of Chemistry 2015年第2期33卷 277-284页

作者： Chanjuan Liu Xianglin Pei Xiaohua Huang Chun Wei Xiaoyi Sun Key Laboratory of New Processing Technology for Nonferrous Metal&Materials Ministry of Educationand School of Material Science and EngineeringGuilin University of TechnologyGuilinGuangxi 541004China College of Chemistry and Chemical Engineering Central South UniversityChangshaHunan 410083China

A novel aromatic diamine monomer bearing tertbutyl and 4-tertbutylphenyl groups,3,3'-ditertbutyl-4,4'-diaminodiphenyl-4''-tertbutylphenylmethane(TADBP),was prepared and characterized.A series of non-coplanar polyimides(PIs)were synthesized via a conventional one-step polycondensation from TADBP and various aromatic dianhydrides including pyromellitic dianhydride(PMDA),3,3',4,4'-biphenyltetracarboxylic dianhydride(BPDA),4,4'-oxydiphthalic anhydride(OPDA),3,3',4,4'-benzophenone tetracarboxylic dianhydride(BTDA)and 4,4'-(hexafluoroisopropylidene)dipthalic anhydride(6FDA).All PIs exhibit excellent solubility in common organic solvents such as N,N-dimethylformamide(DMF),N,N-dimethylacetamide(DMAc),N-methyl-2-pyrrolidone(NMP),dimethyl sulfoxide(DMSO),chloroform(CHCl3),tetrahydrofuran(THF),and so ***,the obtained transparent,strong and flexible polyimide films present good thermal stability and outstanding optical *** glass transition temperatures(Tgs)are in the range of 298 to 347℃,and 10%weight loss temperatures are in excess of 490℃with more than 53%char yield at 800℃in *** the polyimides can be cast into transparent and flexible films with tensile strength of 80.5-101 MPa,elongation at break of 8.4%-10.5%,and Young's modulus of 2.3-2.8 ***,the PIs show the cutoff wavelengths of 302-356 nm,as well as low moisture absorption(0.30%-0.55%)and low dielectric constant(2.78-3.12 at 1 MHz).

关键词： polyimides tertbutyl group solubility dielectric constant

Synthesis and Characterization of Novel polyimides Based on Pyridine-containing Diamine

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Chinese Chemical Letters 2005年第9期16卷 1165-1168页

作者： Shu Jiang ZHANG Yan Feng LI Xiao Long WANG Da Xue YIN Yu SHAO Xin ZHAO College of Chemistry and Chemical Engineering State Key Laboratory of AppliedOrganic Chemistry Institute of Biochemical Engineering ＆ Environmental Technology Lanzhou University Lanzhou 730000

A new aromatic diamine monomer containing pyridine unit, 2,6-bis （4-aminophenoxy- 4＇-benzoyl）pyridine（BABP）, was synthesized in three steps, starting from 2,6-pyridinedicarboxyl chloride. A series of novel pyridine-containing polyimides were prepared v/a the polycondensation of BABP with various aromatic dianhydrides through poly（amic acid） precursors, and thermal or chemical imidization of the precursors. The polyimides exhibit desirable properties, e.g., good solubility in N-methyl-2-pyrrolidone and m-cresol, excellent thermal stability and film-forming capability, as well as high inherent viscosity, indicating high molecular weight.

关键词： Heteroaromatic polymer polyimides pyridine-containing monomer synthesis,aromatic diamine.