NDLI: Synthesis of New Optically Active Poly(amide-imide)s Derived from N,N'- (pyromellitoyl)-bis-S-valine Diacid Chloride and Aromatic Diamines under Microwave Irradiation and Classical Heating

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Synthesis of New Optically Active Poly(amide-imide)s Derived from N,N'- (pyromellitoyl)-bis-S-valine Diacid Chloride and Aromatic Diamines under Microwave Irradiation and Classical Heating

Content Provider	Semantic Scholar
Author	Mallakpour, Shadpour Shahmohammadi, Mohammad Hassan
Copyright Year	2005
Abstract	reacted with s-valine (2) in acetic acid and the resulting imide-acid [N,N'-(pyromellitoyl)-bis-s-valine] (4) was obtained in high yield. The compound (4) was converted to the N,N'-(pyromellitoyl)-bis-S-valine diacid chloride (5) by reaction with thionyl chloride. The polycondensation reaction of this diacid chloride with several aromatic diamines such as 1,4-phenylenediamine (6a), 4,4'-diaminodiphenyl methane (6b), 4,4'-diaminodiphenylsulfone (4,4'-sulfonyldianiline) (6c), 4,4'-diaminodiphenylether (6d), 2,4diaminotoluene (6e), and 1,3-phenylenediamine (6f) was developed by using a domestic microwave oven in the presence of a small amount of a polar organic medium such as ocresol and trimethylsilyl chloride as an activating agent for diamines. The polymerization reactions were also performed with two other methods: low-temperature and high-temperature solution polycondensation in the presence of trimethylsilyl chloride. The polymerization reactions proceeded fast and produced a series of optically active poly(amideimide)s with good yield and moderate inherent viscosity of 0.25-0.43 dLg-1. One of the polymers (7b) showed high thermal resistance, the temperature of 5 % weight loss for (7b) was 490oC and the residual weight at 600oC was 76%. All of the above polymers were fully characterized by IR, elemental analysis and specific rotation. Some structural characterization and physical properties of these optically active poly(amide-imide)s are reported. Synthesis of New Optically Active Poly(amide-imide)s Derived from N,N'(pyromellitoyl)-bis-S-valine Diacid Chloride and Aromatic Diamines under Microwave Irradiation and Classical Heating
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://journal.ippi.ac.ir/manuscripts/IPJ-2006-01-561.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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