@article { ISI:000238989300008, title = {Irradiation effects of 12 eV oxygen ions on polyimide and fluorinated ethylene propylene}, journal = {Radiation Effects and Defects in Solids}, volume = {161}, number = {8}, year = {2006}, month = {AUG}, pages = {495-504}, publisher = {TAYLOR \& FRANCIS LTD}, type = {Article}, address = {4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND}, abstract = {

Polyimide (PI) and Fluorinated Ethylene Propylene (FEP) samples (15mm x 15mm x 50 mu m ) were exposed to atomic oxygen ions of average energy similar to 12 eV and flux similar to 5x10(13) ions cm(-2) s(-1) , produced in the Electron Cyclotron Resonance (ECR) plasma. The energy and the flux of the oxygen ions at different positions in the plasma were measured by a retarding field analyzer. The fluence of the oxygen ions was varied from sample to sample in the range of similar to 5x10(16) to 2x10(17) ions cm(-2) by changing the irradiation period. The pre- and the post-irradiated samples were characterized by the weight loss, Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS), and Fourier Transform Infrared (FTIR) techniques. The weight of the PI and FEP samples decreased with increasing the ion fluence. However, the erosion yield for the PI is found to be higher, by almost a factor five, when compared with that of FEP. On the surface region of irradiated samples, the concentrations of the carbon, fluorine, and oxygen and their corresponding chemical bonds have changed appreciably. Moreover, blisters and nanoglobules were also observed even at a fluence of similar to 10(17) ions cm(-2) . This oxygen ion fluence is almost two orders of magnitude lower than that of the 5 eV atomic oxygen, which a satellite encounters in the space, at the low Earth orbit, during its mission period of about 7 years.

}, keywords = {atomic oxygen, ECR plasma, FEP, FTIR, Polyimide, SEM, weight loss, XPS}, issn = {1042-0150}, doi = {10.1080/10420150600810224}, author = {Majeed, Riyadh M A Abdul and Purohit, V. S. and Bhoraskar, S. V. and Mandale, A. B. and Bhoraskar, Vasant N.} } @article { ISI:000325924000001, title = {New organosoluble aromatic poly(esterimide)s containing pendent pentadecyl chains: synthesis and characterization}, journal = {High Performance Polymers}, volume = {25}, number = {7}, year = {2013}, month = {NOV}, pages = {735-743}, publisher = {SAGE PUBLICATIONS LTD}, address = {1 OLIVERS YARD, 55 CITY ROAD, LONDON EC1Y 1SP, ENGLAND}, abstract = {

A new diimide dicarboxylic acid, namely 2,2-(4-pentadecyl-1,3-phenylene)bis(1,3-dioxoisoindoline-5-carboxylic acid), containing preformed imide rings and pentadecyl chain, was synthesized by the reaction of 4-pentadecylbenzene-1,3-diamine with trimellitic anhydride. A series of new aromatic poly(esterimide)s (PEIs) was synthesized using diphenylchlorophosphate-activated direct polycondensation of 2,2-(4-pentadecyl-1,3-phenylene)bis(1,3-dioxoisoindoline-5-carboxylic acid), with five commercially available bisphenols, namely 4,4-isopropylidenediphenol (I), 4,4-(hexafluoroisopropylidene)diphenol (II), 4,4-oxydiphenol (III), 4,4-biphenol (IV), and 4,4-(9-fluorenylidene)diphenol (V) in the presence of pyridine and lithium chloride. Inherent viscosities of PEIs were in the range 0.54-0.83dLg(-1) in chloroform (CHCl3) at 30 +/- 0.1 degrees C. PEIs containing pendent pentadecyl chains were soluble in organic solvents such as CHCl3, m-cresol, N, N-dimethylacetamide, 1-methyl-2-pyrrolidinone, pyridine, and nitrobenzene. Tough, transparent, and flexible films of PEIs could be cast from their CHCl3 solutions. PEIs exhibited glass transition temperature in the range 145-198 degrees C. The temperature at 10\% weight loss of PEIs, determined by thermogravimetric analysis under the nitrogen atmosphere, was in the range of 450-470 degrees C indicating good thermal stability.

}, keywords = {pendent pentadecyl chains, Polycondensation, Polyimide, Preformed imide rings, Thermogravimetric analysis}, issn = {0954-0083}, doi = {10.1177/0954008313483344}, author = {Sadavarte, Nilakshi V. and Patil, Sachin S. and Avadhani, C. V. and Wadgaonkar, Prakash P.} } @article { ISI:000370420000003, title = {Synthesis and characterization of thermally stable polyimides with a pendent phenothiazine unit based on new diamine 10-(3,5-diaminobenzoyl)phenothiazine}, journal = {High Performance Polymers}, volume = {28}, number = {1}, year = {2016}, month = {FEB}, pages = {26-33}, publisher = {SAGE PUBLICATIONS LTD}, address = {1 OLIVERS YARD, 55 CITY ROAD, LONDON EC1Y 1SP, ENGLAND}, abstract = {

A novel diamine 10-(3,5-diaminobenzoyl)phenothiazine (DBPT) with a side chain containing phenothiazine unit was synthesized. A new family of polyimides (PIs) containing phenothiazine unit in the side chains has been successfully synthesized by direct polycondensation of DBPT with pyromellitic dianhydride, 3,3{\textquoteright},4,4{\textquoteright}-benzophenone tertacarboxylic dianhydride, and 4,4{\textquoteright}-oxydiphthalic anhydride (ODA) via a conventional two-step chemical imidization process. The yield of polymers was good enough, which were soluble in most organic solvents. The molecular orbital energy gaps, thermal stability, and crystallinity of PIs were investigated by molecular modeling, thermogravimetric analysis, and wide-angle X-ray scattering, respectively. Thermal properties of polymers were good enough to permit the use of these PIs in various applications; only 49\% weight loss is detected at 900 degrees C in nitrogen atmosphere. X-Ray diffraction clearly reveals the amorphous nature of PIs. A quantum modeling study (density functional theory) has shown the influence of dianhydride structure on the energy difference of highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels.

}, keywords = {phenothiazine-containing diamine, Polyimide, thermally stable polymer}, issn = {0954-0083}, doi = {10.1177/0954008314568877}, author = {Ghorpade, Ravindra V. and Thorave, Asmita K. and Rajan, C. R. and Chavan, Nayaku and Ponrathnam, S.} } @article {43796, title = {Partially bio-based poly(amide imide)s by polycondensation of aromatic diacylhydrazides based on lignin-derived phenolic acids and aromatic dianhydrides: synthesis, characterization, and computational studies}, journal = {Journal of Polymer Science Part A-Polymer Chemistry}, volume = {55}, year = {2017}, month = {NOV}, pages = {3636-3645}, type = {Article}, abstract = {

Two new bio-based diacylhydrazide monomers, namely, 4,4-(propane-1,3-diylbis(oxy))bis(3-methoxybenzohydrazide) and 4,4-(propane-1,3-diylbis(oxy))bis(3,5-dimethoxybenzohydrazide) were synthesized starting from lignin-derived phenolic acids, namely, vanillic acid and syringic acid. A series of poly(amide imide)s was synthesized by polycondensation of these diacylhydrazide monomers with commercially available aromatic dianhydrides. Poly(amide imide)s showed inherent viscosity in the range 0.44-0.56 dLg(-1) and exhibited good solubility in organic solvents. Poly(amide imide)s could be cast into transparent, flexible, and tough films from their N,N-dimethylacetamide solutions. Poly(amide imide)s showed 10\% weight loss in the temperature range 340-364 degrees C indicating their good thermal stability. Glass transition temperature (T-g) of poly(amide imides)s were measured by DSC and DMA which were in the range 201-223 degrees C and 214-248 degrees C, respectively. The T-g values of poly(amide imide)s were dependent on the number methoxy substituents on aromatic rings of diacylhydrazide monomers. Molecular dynamics simulation studies revealed that chain rigidity is the dominant factor for observed trends in T-g. (c) 2017 Wiley Periodicals, Inc.

}, keywords = {Biobased Polymers, Computational studies, Glass-transaction temperature, lignin, Monomers, Plant oils, Polyimide, Reneable resources, Renewable resources, Step-growth polymers, structure-property relations, Sustanaible Polymers, Thermal night, Thermosetting resins, Vanillin}, issn = {0887-624X}, doi = {10.1002/pola.28748}, author = {Kuhire, Sachin S. and Sharma, Pragati and Chakrabarty, Suman and Wadgaonkar, Prakash P.} } @article {49814, title = {Orthogonally Engineered Redox-Active Polyimide-Carbon Nanotube Hybrids for Long-Life Lithium-Ion Battery Cathode}, journal = {Small}, volume = {22}, year = {2026}, month = {JAN}, type = {Article}, abstract = {

The diverse structural tunability and engineered electronic properties of organic polymers have sparked significant interest in their use as cathode materials for lithium-ion storage. Recent advances suggest that organic cathodes can serve as promising alternatives to conventional metal oxide counterparts due to their elemental abundance, safety, and high theoretical capacity. However, developing cathode materials that simultaneously exhibit high specific capacity, long cycle life, and excellent rate performance remains a critical challenge. In this study, the synthesis and application of a redox-active polyimide based on orthogonally positioned, active site-rich mellitic trianhydride (MTA) and naphthalene diimide (NDI), integrated with multi-walled carbon nanotubes (MWCNTs), referred to as MTA-NDI@CNT are reported. The pristine MTA-NDI polymer demonstrates a specific capacity of 60 mAh g-1 at a current density of 200 mA g-1 and exhibits remarkable cycling stability over 20 000 cycles. Upon hybridisation with CNT (10 wt.\%), the composite (MTA-NDI@CNT) delivers a nearly threefold enhancement in specific capacity, reaching 170 mAh g-1 at 500 mA g-1, along with stable cycling performance over 1300 cycles and 60.5\% capacity retention.

}, keywords = {cathode, CNT, lithium-ion battery, orthogonality, Polyimide}, issn = {1613-6810}, doi = {10.1002/smll.202509881}, author = {Thanasekar, Chandragopal and Javaregowda, Bharathkumar H. and Veer, Sairam Dnyaneshwar and Devasia, George and Krishnamurty, Sailaja and Krishnamoorthy, Kothandam and Babu, Sukumaran Santhosh} }