@article { ISI:000236423600081, title = {Synthesis and characterization of aromatic copolyesters containing siloxane linkages in the polymer backbone}, journal = {Journal of Applied Polymer Science}, volume = {100}, number = {4}, year = {2006}, month = {MAY}, pages = {3222-3228}, publisher = {JOHN WILEY \& SONS INC}, type = {Article}, address = {111 RIVER ST, HOBOKEN, NJ 07030 USA}, abstract = {

A new series of aromatic copolyesters containing siloxane linkages were prepared by the melt polymerization of bisphenol A (BPA) with eugenol end-capped siloxane (EuSi), diphenyl terephthalate (DPT), and diphenyl isoplithalate (DPI) in varying ratio in the temperature range 220-290 degrees C under reduced pressure in the presence of dibutyl tin dilaurate (DBTL) catalyst. The siloxane copolyesters prepared were characterized by FTIR, H-1-NMR spectroscopy, solution viscosity, thermogravimetric analysis, differential scanning calorimetry, and X-ray diffraction. The effect of incorporation of eugenol end-capped siloxane was studied on the properties of BPA/DPI/DPT copolyesters. The glass-transition temperature of copolyester was decreased from 184 to 70 degrees C by incorporation of 20\% of eugenol endcapped siloxane. All copolyesters were found to be soluble in commonly used aprotic polar solvents and had film-forming properties. (c) 2006 Wiley Periodicals, Inc.

}, keywords = {aromatic copolyesters, Bisphenol A, diphenyl isophthalate, diphenyl terephthalate, eugenol end-capped siloxane, melt polymerization}, issn = {0021-8995}, doi = {10.1002/app.22266}, author = {Waghmare, P. B. and Idage, Susheela B. and Menon, Shamal K. and Idage, Bhaskar B.} } @article { ISI:000237680000010, title = {Synthesis and characterization of copolyarylates using tin octoate as a catalyst}, journal = {Journal of Applied Polymer Science}, volume = {101}, number = {1}, year = {2006}, month = {JUL}, pages = {70-77}, publisher = {JOHN WILEY \& SONS INC}, type = {Article}, address = {111 RIVER ST, HOBOKEN, NJ 07030 USA}, abstract = {

A series of copolyarylates of bisphenol A (BPA) with varying ratios of diphenyl terephthalate (DPT) and diphenyl isophthalate (DPI) were prepared by melt polymerization at a temperature ranging from 200 to 290 degrees C under reduced pressure in the presence of tin octoate catalyst. Tin octoate catalyst has been extensively used for the preparation of biodegradable polymers namely, poly(lactic acid), poly(glycolic acid), and poly(lactide-glycolide) copolyesters. However, there are no reports on the preparation of copolyesters by melt polymerization using tin octoate catalyst. The effect of tin octoate catalyst was studied on the preparation of BPA/DPT/DPI copolyarylates. The copolyarylates were characterized by infrared and H-1 NMR spectroscopy, solution viscosity, thermogravimetric analysis, differential scanning calorimetry, and X-ray diffraction. The solution viscosities of copolyarylates were varied from 0.43 to 0.56 dL/g and the glass transition temperature (T-g) of copolyarylates was varied from 155 to 222 degrees C by varying the ratio of DPT and DPI. Most of the copolyarylates were found to be soluble in commonly used organic solvents and had film-forming properties. (c) 2006 Wiley Periodicals, Inc.

}, keywords = {copolyarylates, diphenyl isophthalate, diphenyl terephthalate, melt polymerization, tin octoate}, issn = {0021-8995}, doi = {10.1002/app.22953}, author = {Waghmare, P. B. and Pathak, P. and Deshmukh, S. A. and Idage, Susheela B. and Idage, Bhaskar B.} } @article { ISI:000238709700070, title = {Synthesis and characterization of siloxane copolyesters containing phenylindane linkages}, journal = {Journal of Applied Polymer Science}, volume = {101}, number = {4}, year = {2006}, month = {AUG}, pages = {2668-2674}, publisher = {JOHN WILEY \& SONS INC}, type = {Article}, address = {111 RIVER ST, HOBOKEN, NJ 07030 USA}, abstract = {

A novel series of siloxane copolyesters containing 1,1,3-trimethyl-3-(p-hydroxyphenyl)-5-indanol (phenylindane bisphenol), diphenyl terephthalate (DPT), diphenyl isophthalate (DPI), and eugenol end-capped siloxanes in varying ratios were prepared at a temperature range of 200-290 degrees C under reduced pressure using dibutyl tin dilaurate catalyst by melt polycondensation. The siloxane-containing copolyesters were characterized by infrared and H-1 NMR spectroscopy, elemental analysis, solution viscosity, thermogravimetric analysis, differential scanning calorimetry, and X-ray diffraction. The effect of incorporation of siloxane moiety was studied on the properties of phenyl indane/DPT/DPI coplyester. The glass transition temperatures of copolyesters were decreased from 235 to 124 degrees C by incorporation of 10\% eugenol end-capped siloxane without affecting the thermal properties. All copolyesters were found to be soluble in commonly used organic solvents and had film forming properties. (c) 2006 Wiley Periodicals, Inc.

}, keywords = {eugenol end capped siloxane, melt polymerization, phenylindane bisphenol, siloxane copolyesters}, issn = {0021-8995}, doi = {10.1002/app.23910}, author = {Waghmare, P. B. and Deshmukh, S. A. and Idage, Susheela B. and Idage, Bhaskar B.} } @article { ISI:000254587500014, title = {Solvent-free and nonisocyanate melt transurethane reaction for aliphatic polyurethanes and mechanistic aspects}, journal = {Journal of Polymer Science Part A-Polymer Chemistry}, volume = {46}, number = {7}, year = {2008}, month = {APR}, pages = {2445-2458}, publisher = {JOHN WILEY \& SONS INC}, address = {111 RIVER ST, HOBOKEN, NJ 07030 USA}, abstract = {

A novel melt transurethane polycondensation route for polyurethanes under solvent-free and nonisocyanate condition was developed for soluble and thermally stable aliphatic or aromatic polyurethanes. The new transurethane process was investigated for A + 13, A-A + B, and A-A + B-B (A-urethane and B-hydroxyl) type condensation reactions, and also monomers bearing primary and secondary urethane or hydroxyl functionalities. The transurethane process was confirmed by H-1 and C-13 NMR, and molecular weight of the polymers were obtained as M-n = 10-15 X 10(3) and M-w = 15-45 X 10(3) g/mol. The mechanistic aspects of the melt transurethane process and role of the catalyst were investigated using model reactions, H-1 NMR, and MALDI-TOF-MS. The model reactions indicated the occurrence of 97\% reaction in the presence of catalyst, whereas its absence gave only less than 2\% of the product. The polymer samples were subjected for end-group analysis using MALDI-TOF-MS, which confirms the Ti-catalyst mediated nonisocyanate pathway in the melt transurethane process. Almost all the polyurethanes were stable up to 280 degrees C, and the T-g of the polyurethanes can be easily fine-tuned from -30 to 120 degrees C by using appropriate diols in the melt transurethane process. (C) 2008 Wiley Periodicals, Inc.

}, keywords = {MALDI, melt polymerization, nonisocyanate, Polycondensation, polyurethanes, thermal stability, transurethane}, issn = {0887-624X}, doi = {10.1002/pola.22578}, author = {Deepa, P. and Jayakannan, M.} }