Novel fluorinated polyimides derived from 9,9-bis(4-amino-3,5-difluorophenyl)fluorene and aromatic dianhydrides

Wang, Chenyi; Zhao, Xiaoyan; Li, Guang; Jiang, Jianming

doi:10.1016/j.polymdegradstab.2009.06.013

Cited by 37 publications

(19 citation statements)

References 36 publications

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“…4 exhibited values of 3.02 GPa for PBA‐a:PMDA, 3.42 GPa for PBA‐a:s‐BPDA, and 2.94 GPa for PBA‐a:BTDA, which are higher than that of the neat PBA‐a, i.e., 2.57 GPa. We can see that the storage modulus of all PBA‐a:aromatic carboxylic dianhydride copolymers is approximately equal to that of typical PI films with a reported value in the range of 2.3–3.0 GPa such as in s‐BPDA/ODA, ODPA/ODA, PMDA/ODA PIs [32, 33], and fluorinated PI [34].…”

Section: Resultsmentioning

confidence: 99%

Effects of aromatic carboxylic dianhydrides on thermomechanical properties of polybenzoxazine‐dianhydride copolymers

Jubsilp

Ramsiri

Rimdusit

2012

Polymer Engineering & Sci

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Enhanced thermomechanical properties of bisphenol‐A based polybenzoxazine (PBA‐a) copolymers obtained by reacting bisphenol‐A‐aniline‐type benzoxazine (BA‐a) resin with three different aromatic carboxylic dianhydrides, i.e., pyromellitic dianhydride (PMDA), 3,3′,4,4′ biphenyltetracarboxylic dianhydride (s‐BPDA), or 3,3′,4,4′ benzophenonetetracarboxylic dianhydride (BTDA) were reported. Glass transition temperature (Tg), of the copolymers was found to be in the order of PBA‐a:PMDA>PBA‐a:s‐BPDA>PBA‐a:‐BTDA. The difference in the Tg of the copolymers is related to the rigidity of the dianhydride components. Furthermore, the Tg of PBA‐a:BTDA, PBA‐a:s‐BPDA, and PBA‐a:BTDA films was observed to be significantly higher than that of the neat PBA‐a owing to the enhanced crosslink density by the dianhydride addition. This greater crosslink density results from additional ester linkage formation between the hydroxyl group of PBA‐a and the anhydride group of dianhydrides formed by thermal curing. Moreover, the copolymers exhibit enhanced thermal stability with thermal degradation temperature (Td) ranging from 410°C to 426°C under nitrogen atmosphere. The char yield at 800°C of the copolymers was found to be remarkably greater than that of the neat PBA‐a with a value up to 60% vs. that of about 38% of the PBA‐a. Toughness of the copolymer films was greatly improved compared to that of the neat PBA‐a. POLYM. ENG. SCI., 2012. © 2012 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Effects of aromatic carboxylic dianhydrides on thermomechanical properties of polybenzoxazine‐dianhydride copolymers

Jubsilp

Ramsiri

Rimdusit

2012

Polymer Engineering & Sci

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“…9,9‐Bis(4‐aminophenyl)fluorene (BAPF) has a similar structure to BHPF except that the hydroxyl moiety is replaced by aniline moiety. Because of the unusual rotational hindrance of the four phenyl rings, BAPF and its derivatives have been used in polyimides,30, 31 sulfonated polyimides,32 polyimine,33 and epoxy 34. In our previous paper, we reported that diamine‐based polybenzoxazines exhibited better thermal stability than biphenol‐based polybenzoxazines.…”

Section: Introductionmentioning

confidence: 99%

Salvage radiation in men after prostate‐specific antigen failure and the risk of death

Cotter

Chen

Moul

et al. 2011

Cancer

100

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BACKGROUND: A survival benefit has been observed with salvage radiation therapy (RT) for prostate-specific antigen (PSA) failure after radical prostatectomy (RP) in men with rapid rises in PSA doubling time (DT, <6 months). Whether such a benefit exits in men with a protracted PSA rise in DT (6 months) is unclear and was examined in the current study. METHODS: Of 4036 men who underwent RP at Duke University between 1988 and 2008, 519 experienced a PSA failure, had complete data, and were the subjects of this study. Univariate and multivariate Cox regression analyses were performed to evaluate whether salvage RT in men with either a rapid (<6 months) or a protracted (6 months) PSA DT was associated with the risk of all-cause mortality adjusting for age at the time of PSA failure, known prostate cancer prognostic factors, and cardiac comorbidity. RESULTS: After a median follow-up of 11.3 years after PSA failure, 195 men died. Salvage RT was associated with a significant reduction in all-cause mortality for men with either a PSA DT of <6 months (adjusted hazard ratio [AHR], 0.53; P ¼ .02) or a PSA DT of 6 months (AHR, 0.52; P ¼ .003). In a subset of patients with comorbidity data at the time of PSA failure, salvage RT remained associated with a significant reduction in all-cause mortality for both men with a PSA DT of <6 months (AHR, 0.35; P ¼ .042) or a PSA DT of 6 months (AHR, 0.60; P ¼ .04). CONCLUSIONS: Salvage RT for PSA DTs less than or in excess of 6 months is associated with a decreased risk in all-cause mortality. Cancer 2011;117:3925-32.

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“…[20] Besides, incorporation of highly electronegative atoms such as fluorine or fluorinated groups in the polymer structure is also advantageous to enhance the solubility of S-coPIs in organic solvents. [20][21][22] The general procedure to increase the proton conductivity of the S-coPIs is to increase the degree of sulfonation (DS). [23,24] This tactic has a characteristic limitation because it often causes the high swelling of the membrane that leads to loss of thermal and mechanical stabilities and decrease in proton conductivity by dilution of sulfonic acid domains.…”

Section: Introductionmentioning

confidence: 99%

Sulfonated co‐poly(ether imide)s with alkyne groups: Fabrication of crosslinked membranes and studies on PEM properties including MFC performance

Kumar

Saha

Tiwari

et al. 2020

Polymer Engineering & Sci

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A new diamine monomer having alkyne side‐groups (DADAF) has been successfully synthesized, and it was used to prepare a series of sulfonated co‐polyimides (DFN‐XX) when reacted with 1,4,5,8‐naphthalenetetracarboxylic dianhydride along with different mole% of 4,4′‐diaminostilbene‐2,2′‐disulfonic acid. The membrane was made from the copolymers by solution casting route, and one of the copolymers DFN‐70 was used to prepare crosslinked membranes by adding a different amount of 1,6‐hexanediazide during solution casting step. The morphological transformation from non‐crosslinked S‐coPI to crosslinked S‐coPI was observed by employing transmission electron microscopy, atomic force microscopy, and small‐angle X‐ray scattering analyses. Compared to the non‐crosslinked DFN‐XX membranes, crosslinked DFN‐70 copolymer membranes showed low water uptake and improved mechanical and peroxide radical stability. Also, crosslinked DFN‐70 copolymer membranes showed significantly higher proton conductivities (0.004‐0.06 S cm−1) compared to those of DFN‐70 (0.003‐0.05 S cm−1) particularly, at 80°C when the relative humidity increased from 40% to 98%. Furthermore, crosslinked DFN‐70 copolymer membranes exhibited significantly enhanced performance in a microbial fuel cell (MFC) as compared to those of non‐crosslinked DFN‐70 membrane.

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Novel fluorinated polyimides derived from 9,9-bis(4-amino-3,5-difluorophenyl)fluorene and aromatic dianhydrides

Cited by 37 publications

References 36 publications

Effects of aromatic carboxylic dianhydrides on thermomechanical properties of polybenzoxazine‐dianhydride copolymers

Effects of aromatic carboxylic dianhydrides on thermomechanical properties of polybenzoxazine‐dianhydride copolymers

Salvage radiation in men after prostate‐specific antigen failure and the risk of death

Sulfonated co‐poly(ether imide)s with alkyne groups: Fabrication of crosslinked membranes and studies on PEM properties including MFC performance

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