01936nas a2200253 4500008004100000022001400041245011300055210006900168260006800237300001400305490000800319520098400327653002601311653001601337653002601353653002701379653003201406653002401438100002101462700002401483700002201507700002301529856013001552 2006 eng d a0021-899500aSynthesis and characterization of aromatic copolyesters containing siloxane linkages in the polymer backbone0 aSynthesis and characterization of aromatic copolyesters containi a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcMAY a3222-32280 v1003 a

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.

10aaromatic copolyesters10aBisphenol A10adiphenyl isophthalate10adiphenyl terephthalate10aeugenol end-capped siloxane10amelt polymerization1 aWaghmare, P., B.1 aIdage, Susheela, B.1 aMenon, Shamal, K.1 aIdage, Bhaskar, B. uhttp://library.ncl.res.in/content/synthesis-and-characterization-aromatic-copolyesters-containing-siloxane-linkages-polymer-002116nas a2200253 4500008004100000022001400041245008500055210006900140260006800209300001000277490000800287520123800295653001901533653002601552653002701578653002401605653001601629100002101645700001501666700002101681700002401702700002301726856011301749 2006 eng d a0021-899500aSynthesis and characterization of copolyarylates using tin octoate as a catalyst0 aSynthesis and characterization of copolyarylates using tin octoa a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcJUL a70-770 v1013 a

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.

10acopolyarylates10adiphenyl isophthalate10adiphenyl terephthalate10amelt polymerization10atin octoate1 aWaghmare, P., B.1 aPathak, P.1 aDeshmukh, S., A.1 aIdage, Susheela, B.1 aIdage, Bhaskar, B. uhttp://library.ncl.res.in/content/synthesis-and-characterization-copolyarylates-using-tin-octoate-catalyst-001910nas a2200229 4500008004100000022001400041245009300055210006900148260006800217300001400285490000800299520104900307653003201356653002401388653002701412653002601439100002101465700002101486700002401507700002301531856012601554 2006 eng d a0021-899500aSynthesis and characterization of siloxane copolyesters containing phenylindane linkages0 aSynthesis and characterization of siloxane copolyesters containi a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcAUG a2668-26740 v1013 a

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.

10aeugenol end capped siloxane10amelt polymerization10aphenylindane bisphenol10asiloxane copolyesters1 aWaghmare, P., B.1 aDeshmukh, S., A.1 aIdage, Susheela, B.1 aIdage, Bhaskar, B. uhttp://library.ncl.res.in/content/synthesis-and-characterization-siloxane-copolyesters-containing-phenylindane-linkages-002178nas a2200241 4500008004100000022001400041245011500055210006900170260006800239300001400307490000700321520131700328653001001645653002401655653001801679653002101697653001801718653002201736653001801758100001401776700001901790856012701809 2008 eng d a0887-624X00aSolvent-free and nonisocyanate melt transurethane reaction for aliphatic polyurethanes and mechanistic aspects0 aSolventfree and nonisocyanate melt transurethane reaction for al a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcAPR a2445-24580 v463 a

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.

10aMALDI10amelt polymerization10anonisocyanate10aPolycondensation10apolyurethanes10athermal stability10atransurethane1 aDeepa, P.1 aJayakannan, M. uhttp://library.ncl.res.in/content/solvent-free-and-nonisocyanate-melt-transurethane-reaction-aliphatic-polyurethanes-and-0