✦ LIBER ✦

Studies on poly(imide-ester)s and poly(imide-urethane)s containing pyromellitimide units

✍ Scribed by Mary, L. J. Francisca; Kannan, P.

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 290 KB
Volume: 47
Category: Article
ISSN: 0959-8103
DOI: 10.1002/(sici)1097-0126(199811)47:3<317::aid-pi40>3.0.co;2-p

No coin nor oath required. For personal study only.

✦ Synopsis

Two new series of poly(imide-ester)s and poly(imide-urethane)s have been synthesized from various N,N@-bis(u-hydroxyalkyl)pyromellitimides (HAPMIs). The poly(imide-ester)s were prepared from terephthalic acid with HAPMIs by melt polycondensation while poly(imide-urethane)s were obtained from HAPMIs with terephthaloyl diazide by solution polycondensation in DMSO using di-n-butyltin dilaurate at 75¡C. Synthesized polymers were characterized by elemental analysis, solubility, inherent viscosity, IR, 1H and 13C NMR and X-ray di †raction studies. Thermal stability and phase transition behaviour were evaluated by TGA, DSC and hot-stage optical polarized microscopy (HOPM). From X-ray di †raction studies d spacings were calculated for poly(imide-ester)s and d spacings showed an oddÈeven e †ect with varying number of methylene spacers. Similarly values obtained by DSC analysis, T m showed an oddÈeven e †ect. Thermal stability decreases as methylene chain length increases.

Society of Chemical Industry

📜 SIMILAR VOLUMES

Thermally stable and organosoluble cardo

Thermally stable and organosoluble cardo binaphthylene based poly(amide imide)s and poly(ester imide)s

✍ Hossein Behniafar; Ashkan Jafari 📂 Article 📅 2006 🏛 John Wiley and Sons 🌐 English ⚖ 160 KB

Synthesis of new poly(phenylquinoxaline-

Synthesis of new poly(phenylquinoxaline-ester-imide)s

✍ M. Bruma; I. Sava; C. Hamciuc; C. I. Simionescu; N. M. Belomoina; S. A. Babich; 📂 Article 📅 1991 🏛 John Wiley and Sons 🌐 English ⚖ 360 KB 👁 2 views

Synthesis and imidization of poly(amic m

Synthesis and imidization of poly(amic methyl ester)s

✍ Wenxi Huang; Yuejin Tong; Jiping Xu; Mengxian Ding 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 224 KB 👁 1 views

The synthesis and characterization of a series of poly(amic methyl ester)s from five aromatic dianhydrides and a diamine, 4,4-oxydianiline (ODA), are described. These poly(amic ester)s are obtained by the low-temperature polycondensation from dianhydrides derived diester-diacyl chlorides and ODA in

Dielectric relaxation of LC-thermotropic

Dielectric relaxation of LC-thermotropic poly(ester imide)s

✍ Javier de Abajo; José G. de la Campa; Angel Alegría; José M. Echave 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 253 KB 👁 1 views

Two different series of poly(ester imide)s, which are distinguished from each other in the orientation of the ester linkages and show well-differentiated thermotropic behavior, are investigated by means of model calculations and dielectric relaxation spectroscopy. Model calculations show that the or

Conformation of spacers in smectic poly(

Conformation of spacers in smectic poly(ester imide)s

✍ Christoph Wutz; Dana Schleyer 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 341 KB 👁 1 views

Several poly(ester imide)s based on 4-N-(carboxyphenyl)trimellitimide, 4-N-(carboxyethenylphenyl)trimellitimide, 4-hydroxy-N-(4-hydroxyphenyl)phthalimide and long aliphatic spacers have been investigated by different solid-state NMR techniques. The conformations of the methylene units were studied b

Aromatic poly(ester imide)s and poly(ami

Aromatic poly(ester imide)s and poly(amide imide)s having 1,1′-binaphthyl-2,2′-diyls in the main chain

✍ Naiheng Song; Lianxun Gao; Xuepeng Qiu; Wei Qi; Mengxian Ding 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 103 KB 👁 2 views