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Chinese Journal of Polymer Science 2005年第1期23卷 47-53页

作者： Jin-gangLiu Yang-xiPeng Hong-shenLi LinFan Shi-yongYang LaboratoryofAdvancedPolymerMaterials CenterforMolecularScienceInstituteofChemistryChineseAcademyofSciencesBeijing100080China DepartmentofChemistry HunanLoudiTeacher＇sCollegeLoudi417000China

Organo-soluble fluorinated polyimides were synthesized by the polycondensation of a new aromatic diamine α,α-bis(4-amino-3,5-dimethylphenyl)-4'-fluorophenyl methane with several aromatic *** one-step polymerizationprocedure was conducted at 180℃ in m-cresol,producing the polyimides with inherent viscosities of 0.68-0.76 dL.g^(-1).Thepolyimides could be soluble not only in polar aprotic solvents,such as N-methyl-2-pyrrolidinone,and N,N-dimethylacetamide,but also in common organic solvents,such as chloroform,cyclopentanone,m-cresol and so *** films show excellent transparency with the UV-Vis cut-off lengths of 310-360 nm and light transmittances ofhigher than 80% in the visible *** addition,the polyimides exhibit good thermal stability with an initial decompositiontemperature(T_d)higher than 530℃ and have more than 60% of residual weight retentions at 700℃.

关键词： fluorinated polyimides Solubility Thermal stability Optical transparency.

High Glass Transition of fluorinated polyimides Derived from 4-（3,4-Difluorophenyl）-2,6-bis（4-aminophenyl）pyridine

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Chinese Journal of Chemistry 2017年第3期35卷 341-346页

作者： XU Xu Beicai Chen Hua Li Xiaohua Huang Chun Wei Key Laboratory of New Processing Technology for NonJerrous Metal & Materials Ministry of Education andSchool of Material Science and Engineering Guilin University of Technology Guilin Guangxi 541004 China Department of Mechanical Automotive & Materials Engineering University of Windsor 401 Sunset Ave Windsor ON Canada N9B 3P4

A series of novel fluorinated polyimides (PIs) were prepared from 4‐(3,4‐difluorophenyl)‐2,6‐bis(4‐aminophenyl)pyridine (FPAP) and commercial aromatic dianhydrides via conventional two‐step thermal imidization technique. The structure of the monomer was confirmed by FT‐IR, NMR, and mass spectrometry. All of the obtained PIs were studied with FT‐IR, TGA, DSC, WAXD and contact angles analysis. These results showed that polymer materials presented excellent thermal properties with the glass transition temperature ( T g ) in the range of 336—434 °C, as well as T 5% , and T 10% decomposition temperature ranges of 543—600 °C and 562—622 °C in a nitrogen atmosphere, respectively. Moreover, they presented excellent mechanical properties with tensile strengths of 68—91 MPa, elongation at break of 5.6%—10.2%, and young's modulus of 1.8—2.4 GPa. Furthermore, they showed outstanding hydrophobicity with the contact angle in the range of 90.5°—96.6°, and the results of WAXD indicated all of the polymers presented amorphous structure.

关键词： fluorinated polyimides thermal properties pyridine hydrophobicity

Synthesis and Properties of New fluorinated polyimides Derived from an Unsymmetrical and Noncoplanar Diamine

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Chinese Journal of Chemistry 2012年第10期30卷 2466-2472页

作者：汪称意赵晓燕李光 School of Material Science and Engineering School of Petrochemical EngineeringChangzhou UniversityChangzhouJiangsu 213164China State Key Laboratory for Modifcation of Chemical Fibers and Polymer Materials College of Material Science and EngineeringDonghua UniversityShanghai 201620China

A new unsymmetrical and noncoplanar diamine containing trifluoromethyl and trimethyl groups, 1,4-bis（4- amino-2-trifluoromethylphenoxy）-2,3,5-trimethylbenzene （2）, was synthesized using 2,3,5-trimethylhydroquinone and 2-chloro-5-nitrobenzotrifluoride as starting materials. A series of fluorinated poly（ether imide）s （PEIs）（4a-4d） were prepared from diamine 2 with four aromatic dianhydrides via a one-step high-temperature polycondensation procedure. The obtained PEIs were readily soluble in most organic solvents and could be solution-cast into flexible and strong films. The resulting thin films exhibited light color and good optical transparency with a cutoff wave- length of 356--376 nm. They also displayed good thermal stability with glass transition temperatures （Tg） above 281℃, 10% weight loss temperatures in the range of 482--486 ~C, and the weight residue more than 55% at 800℃ in nitrogen. Moreover, they revealed low dielectric constants （2.77-2.93 at 1 MHz） and low moisture absorp- tions （0.41%-0.57%）.

关键词： fluorinated polyimides solubility optical transparency dielectric constant

New Soluble polyimides with High Optical Transparency and Light Color Containing Pendant Trifluoromethyl and Methyl Groups

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Chinese Journal of Chemistry 2012年第7期30卷 1555-1560页

作者：汪称意赵晓燕李光 School of Material Science and Engineering School of Petrochemical EngineeringChangzhou UniversityChangzhouJiangsu 213164China State Key Laboratory for Modification of Chemical Fibers'and Polymer Materials College of Material Science and EngineeringDonghua UniversityShanghai 201620China

A new aromatic diamine containing trifluoromethyl and methyl groups, namely a,a-bis（4-amino-3-methylphetayl）-4-（trifluoromethyl）phenylmethane （1）, was synthesized from 2-methylaniline and 4-（trifluoromethyl）- benzaldehyde. A series of fluorinated polyimides （PIs） were prepared from the diamine with four commercially available aromatic tetracarboxylic dianhydrides using a one-step high-temperature polycondensation procedure. These obtained PIs showed excellent solubility, with the dissolvability at a concentration of 10 wt% in most solvents, and they could afford flexible and strong films. Thin films of these PIs exhibited high optical transparency and light color, with the cutoff wavelength at 324-357 nm and transmittance higher than 74% at 450 nm. Moreover, these Pls possessed eminent thermal stability and good mechanical properties.

关键词： fluorinated polyimides solubility optical transparency

fluorinated PHTHALAZINONE-CONTAINING COpolyimides FOR PASSIVE OPTICAL WAVEGUIDES

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Chinese Journal of Polymer Science 2005年第1期23卷 71-74页

作者： Jin-yanWang Gong-xiongLiao YuanSong Shu-deXiao Xi-gaoJian DepartmentofPolymerMaterialsandScience DalianUniversityofTechnologyDalian116012China

A series of fluorinated copolyimides containing phthalazinone moieties were prepared from 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride(6FDA),3,3'4,4'-benzophenone-tetracarboxylic dianhydride(BPDA)and2-(4-aminophenyl)-4-[4-(4-aminophenoxyl)phenyl]-2,3-phthalazin-1-one(DHPZ-2NH_2)for making polymeric *** resulting copolymers containing 0-50 mo1% BPDA/DHPZ-2NH_2 show good solubility and are soluble insome organic polar aprotic *** copolyimides also present excellent thermal *** polymers possess highglass transition temperature higher than 603 K and high decomposition temperature above 742 K determined by differentialscanning calorimetry and thennogravimetric analysis,respectively,under a nitrogen *** refractive indicescould be controlled by varying the ratio of 6FDA and BPDA in the copolymer from 0.5 to 1.0,and the in-plane refractiveindices(n_(TE))range from 1.6366 to 1.6668 and the out-of-plane refractive indices(n_(TM))from 1.6024 to 1.6280 at 632.8 *** polymers birefringence(0.0342-0.0388)is almost independent of the 6FDA content of copolymer,which indicated thatthe phthalazinone-containing copolyimides could be suitable to fabricate optical waveguides possessing a low polarizationdependent loss(PDL).

关键词： Polymeric optical waveguides fluorinated polyimides Phthalazinone.

Synthesis and Characterization of fluorinated Polyimide Derived from 3,3＇-Diisopropyl-4,4＇-diaminodiphenyl- 3＂,4＂-difluorophenylmethane

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Chinese Journal of Chemistry 2015年第10期33卷 1159-1166页

作者： Xiaohua Huang Mei Mei Chanjuan Liu Xianglin Pei Chun Wei Key Laboratory of New Processing Technology for Nonferrous Metal & Materials Ministry of Education andSchool of Material Science and Engineering Guilin University of Technology Guilin Guangxi 541004 China Ministry of Education Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources School of Chemistry and Pharmaceutical Science Guangxi Normal University Guilin Guangxi 541004 China

A novel aromatic diamine monomer, 3,3＇-diisopropyl-4,4＇-diaminodiphenyl-3＂,4＂-difluorophenylmethane （PAFM）, was successfully synthesized by coupling of 2-isopropylaniline and 3,4-difluorobenzaldehyde. The aro- matic diamine was adopted to synthesize a series of fluorinated polyimides by polycondensation with various dian- hydrides： pyromellitic dianhydride （PMDA）, 3,3＇,4,4＇-biphenyltetracarboxylic dianhydride （BPDA）, 4,4＇-oxydiph- thalic anhydride （ODPA） and 3,3＇,4,4＇-benzophenone tetracarboxylic dianhydride （BTDA） via the conventional one-step method. These polyimides presented excellent solubility in common organic solvents, such as N,N-dimeth- ylformamide （DMF）, N,N-dimethyl acetamide （DMAc）, dimethyl sulfoxide （DMSO）, N-methyl-2-pyrrolidone （NMP）, chloroform （CHC13）, tetrahydrofuran （THF） and so on. The glass transition temperatures （Tg） of fluorinated polyimides were in the range of 260--306 ℃ and the temperature at 10% weight loss in the range of 474--502 ℃ Their films showed the cut-off wavelengths of 330--361 nm and higher than 80% transparency in a wavelength range of 385--463 nm. Moreover, polymer films exhibited low dielectric properties in the range of 2.76--2.96 at 1 MHz, as well as prominent mechanical properties with tensile strengths of 66.7--97.4 MPa, a tensile modulus of 1.7--2.1 GPa and elongation at break of 7.2%- 12.9%. The polymer films also showed outstanding hydrophobicity with the contact angle in the range of 91.2°--97.9°.

关键词： fluorinated polyimides solubility transparency dielectric constant