@article { ISI:000263629200030,
	title = {Synthesis and characterization of new polyimides containing pendent pentadecyl chains},
	journal = {European Polymer Journal},
	volume = {45},
	number = {2},
	year = {2009},
	month = {FEB},
	pages = {582-589},
	publisher = {PERGAMON-ELSEVIER SCIENCE LTD},
	address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND},
	abstract = {<p>A new unsymmetrical aromatic diamine, viz., 4-pentadecylbenzene-1,3-diamine was synthesized through a series of reaction steps starting from 3-pentadecylphenol. 4-Pentadecylbenzene-1,3-diamine was employed to synthesize a series of new polyimides by one-step polycondensation in m-cresol with four commercially available aromatic dianhydrides. viz., 3,3{\textquoteright},4,4{\textquoteright}-biphenyltetracarboxylic dianhydride (BPDA), 3,3{\textquoteright},4,4{\textquoteright}-benzophenone-tetracarboxylic dianhydride (BTDA), 4,4{\textquoteright}-oxydiphthalic anhydride (ODPA) and 4,4{\textquoteright}-(hexafluoroisopropylidene)diphthalic anhydride (6-FDA). Inherent viscosities of resulting polyimides were in the range 0.33-0.67 dL/g and number average molecular weights were in the range 14,700-52,200 (GPC, polystyrene standard). Polyimides containing pendent pentadecyl chains were soluble in organic solvents such as chloroform, m-cresol, N,N-dimethylacetamide (DMAc), 1-methyl-2-pyrrolidinone (NMP), pyridine and nitrobenzene. Strong and flexible films of polyimides could be cast from their chloroform solutions. Polyimides exhibited glass transition temperature in the range 158-206 degrees C. The temperature at 10\% wt. loss (T(10)). determined by TGA in nitrogen atmosphere, of polyimides was in the range 470-480 degrees C indicating good thermal stability. (C) 2008 Elsevier Ltd. All rights reserved.</p>},
	keywords = {Cashew nut shell liquid, Glass transition temperature, Pendant pentadecyl chain, polyimides},
	issn = {0014-3057},
	doi = {10.1016/j.eurpolymj.2008.11.013},
	author = {Sadavarte, Nilakshi V. and Halhalli, Mahadeo R. and Avadhani, C. V. and Wadgaonkar, Prakash P.}
}
@article { ISI:000279085200015,
	title = {Regularly alternating poly(amideimide)s containing pendent pentadecyl chains: synthesis and characterization},
	journal = {European Polymer Journal},
	volume = {46},
	number = {6},
	year = {2010},
	month = {JUN},
	pages = {1307-1315},
	publisher = {PERGAMON-ELSEVIER SCIENCE LTD},
	address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND},
	abstract = {<p>Two new aromatic diamines containing preformed amide linkages, viz., N,N{\textquoteright}-(4-pentadecyl-1,3-phenylene)bis(4-aminobenzamide) I and N,N{\textquoteright}-(4-pentadecyl-1,3-phenylene)bis(3-aminobenzamide) II, were synthesized by reaction of 4-pentadecylbenzene-1,3-diamine with 4-nitrobenzoylchloride and 3-nitrobenzoylchloride, followed by reduction of the respective dinitro derivatives. A series of new poly(amideimide)s was synthesized by poly-condensation of I and II with four commercially available aromatic dianhydrides, viz., pyromellitic dianhydride (PMDA), 4,4{\textquoteright}-biphenyltetracarboxylic dianhydride (BPDA), 4,4{\textquoteright}-oxydiphthalic anhydride (ODPA), and 4,4{\textquoteright}-(hexafluoroisopropylidene)diphthalic anhydride (6-FDA) in N,N-dimethylacetamide (DMAc) employing conventional two step method via poly(amic acid) intermediate followed by thermal imidization. Reference poly(amideimide)s were synthesized by polycondensation of N,N{\textquoteright}-(1,3-phenylene)bis(4-aminobenzamide) and N,N{\textquoteright}-(1,3-phenylene)bis(3-aminobenzamide) with the same aromatic dianhydrides. Inherent viscosities of poly(amideimide)s containing pendent pentadecyl chains were in the range 0.37-1.23 dL/g in N,N-dimethylacetamide at 30 +/- 0.1 degrees C indicating the formation of medium to high molecular weight polymers. The poly(amideimide)s containing pendent pentadecyl chains were found to be soluble in N,N-dimethylacetamide, N,N-dimethylformamide, 1-methyl-2-pyrrolidinone and pyridine and could be cast into transparent, flexible and tough films from their N,N-dimethylacetamide solution. Wide angle X-ray diffraction patterns exhibited broad halo indicating that the polymers were essentially amorphous in nature. X-ray diffractograms also displayed sharp reflection in the small angle region (20 approximate to 3 degrees) for poly(amideimide)s containing pentadecyl chains indicating the formation of layered structure arising from packing of flexible pentadecyl chains. The glass transition temperatures observed for reference poly(amideimide)s were in the range 331-275 degrees C and those for poly(amideimide)s containing pendent pentadecyl chains were in the range 185-286 degrees C indicating a large drop in T(g), owing to the {\textquoteleft}{\textquoteleft}internal plasticization{\textquoteright}{\textquoteright} effect of pentadecyl chains. The temperature at 10\% weight loss (T(10)), determined by TGA in nitrogen atmosphere, were in the range 460-480 degrees C indicating their good thermal stability. (C) 2010 Elsevier Ltd. All rights reserved.</p>},
	keywords = {Glass transition temperature, Pendent pentadecyl chain, Poly(amideimide)s, Preformed amide linkage, thermal stability},
	issn = {0014-3057},
	doi = {10.1016/j.eurpolymj.2010.03.007},
	author = {Sadavarte, Nilakshi V. and Avadhani, C. V. and Naik, Parimal V. and Wadgaonkar, Prakash P.}
}
