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485 results on '"Yang, Chin-Ping"'

1. Influence Clubs in Social Networks

Author

Yang, Chin-Ping, Liu, Chen-Yi, Wu, Bang Ye, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Goebel, Randy, editor, Siekmann, Jörg, editor, Wahlster, Wolfgang, editor, Pan, Jeng-Shyang, editor, Chen, Shyi-Ming, editor, and Nguyen, Ngoc Thanh, editor

Published
2010
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21. Synthesis and properties of new soluble poly(amide-imide-imide)s

Author

Yang, Chin-Ping, Chen, Ruei-Shin, and Wei, Chi-Shu

Subjects
E.I. du Pont de Nemours and Co. -- Product information, Polyamides -- Research -- Product information, Polymer industry -- Research -- Product information, Polyimides -- Research -- Product information, Engineering and manufacturing industries, Science and technology, Research, Product information
Abstract

A new-type tetraimide-dicarboxylic acid (I) was synthesized starting from the ring-opening addition of p-aminobenzoic acid (p-ABA), 4,4'-oxydiphthalic anhydride (ODPA), and 4,4'-methylenedianiline (MDA) at a 2:2:1 molar ratio in N-methyl-2-pyrrolidone (NMP), followed by cyclodehydration to the diacid I. A series of poly(amide-imide-imide)s ([III.sub.a-i]) with inherent viscosities of 0.78-1.45 dL/g was prepared by triphenyl phosphite-activated polycondensation from the tetraimide-diacid I with various aromatic diamines ([II.sub.a-i]) in a medium consisting of NMP, pyridine, and calcium chloride. Most of the polymers were readily soluble in a variety of organic solvents such as NMP. N,N-dimethyl acetamide, dimethyl sulfoxide, and even in less polar m-cresol. Compared with those of the corresponding poly(amide-imide)s [IV.sub.a-i], the solubilities of poly(amide-imide-imide)s [III.sub.a-i] were greatly improved. Polymers [III.sub.a-h] afforded tough, transparent, and flexible films, which had tensile stren gths ranging from 87 to 107 MPa, elongations at break from 9% to 14%, and initial moduli from 2.0 to 2.4 GPa. The glass transition temperatures of polymers were recorded at 270°C-309°C. They had 10% weight loss at temperatures in the range of 540°C-570°C and left more than 52% residue even at 800°C in nitrogen., INTRODUCTION Aromatic polyamides, a kind of polymer material with superior mechanical strength (1, 2), are synthesized from aromatic diamines and aromatic dicarboxylic acids. DuPont Kevlar® [poly(p-phenylene) terephthalamide] and DuPont Nomex® [...]

Published
2002

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