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48. The molecular weights did not show any increase on increasing the reaction time. The DB was determined to be in the range 47–55%. The hb polymers exhibited lower solution viscosities, as expected, and also exhibited lower Tg values than the linear analogs, ranging from 130 to 150 C, 40 A. Ghosh et al. depending on molecular weight. The authors attributed this to poor chain entanglement of the hb polymers in comparison to the linear analogs. Tailoring the DB through the synthesis of hb poly(ether ester)s was accomplished by Unal et al.

109 Abbreviations 6F-BPA AFM BPA BPADA BTDA C-BPA CHCl3 Ð DB DMAc DMF DMSO DSC EB FTIR GPC HQDPA hb Mn Mw NMP NMR ODA ODPA PAA PL PMDA SEM Tc Td Td,5% Td,10% TEM Tg TGA THF Tm UV 4,40 -(Hexafluoroisopropylidene)diphenol Atomic force microscopy 4,40 -Isopropylidenediphenol 2,2-Bis[4-(3,4-dicarboxyphenoxy) phenyl]propane dianhydride 3,30 ,4,40 -Benzophenonetetracarboxylic dianhydride 4,40 -(9-Fluorenylidene)diphenol Chloroform Dispersity (Mw/Mn) Degree of branching Dimethyl acetamide Dimethylformamide Dimethyl sulfoxide Differential scanning calorimetry Elongation at break Fourier transform infra-red spectroscopy Gel permeation chromatography 1,4-Bis(3,4-dicarboxyphenoxy)benzene dianhydride Hyperbranched Number average molecular weight Weight average molecular weight N-Methylpyrrolidinone Nuclear magnetic resonance 4,40 -Oxydianiline 4,40 -Oxydiphthalic dianhydride Polyamic acid Photoluminescence Pyromellitic dianhydride Scanning electron microscopy Crystallization temperature Onset decomposition temperature 5% weight loss temperature 10% weight loss temperature Transmission electron microscopy Glass transition temperature Thermogravimetric analysis Tetrahydrofuran Melting temperature Ultraviolet Aromatic Hyperbranched Polymers: Synthesis and Application 29 1 Introduction to Hyperbranched Polymers The research activities in the field of hyperbranched (hb) polymers have generated an innovative and impressive number of new hb polymers, together with first applications of these materials.

3 Optoelectronic Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 A. com S. Banerjee Materials Science Centre, Indian Institute of Technology, Kharagpur 721302, India B. Voit Leibniz-Institut fu¨r Polymerforschung Dresden e. , Hohe Strasse 6, 01069 Dresden, Germany 28 A. Ghosh et al. Concluding Remarks . . . . . . . . . . . . . . . . . . . . . . . .

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AWWA standard [for] fused polyolefin coating systems for the exterior of steel water pipelines by American Water Works Association.; American National Standards Institute

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