No abstract

No abstract

No abstract

Chlorocarboxylated polyethylene (CCPE) is produced by simultaneous reaction of chlorine and maleic anhydride (MA) with polyethylene (PE). Low concentrations of the carboxyl groups in CCPE have been quantitatively estimated by dye interaction method and non-aqueous titration procedure. IR spectroscopic data are presented for the structural characterization of CCPE. During chlorocarboxylation, maleic anhydride can be anchored to the backbone chlorinated PE (CPE) chain as a chlorinated single monomeric unit without forming any graft copolymer of short branches. ZUSAMMENFASSUNG:Chlorcarboxyliertes Polyethylen (CCPE) wird durch simultane Reaktion von Chlor und Maleinsiiureanhydrid mit Polyethylen hergestellt. Niedrige Konzentrationen der Carboxylgruppen in CCPE sind quantitativ mit Hilfe der Farbstoffwechselwirkungsmethode und nichtwwriger Titrationen bestimmt worden. IR-spektroskopische Daten sind ftkr die Strukturcharakterisierung angegeben. Bei der Chlorcarboxylierung kann Maleinsilureanhydrid als eine einfache Monomereinheit ohne Entstehung von Pfropfcopolymeren an die Kette aus chloriertem PE (CPE) addiert werden.

The electrical conductivity of polyphenylene sulfide doped with ferric chloride using various solvents has been studied as a function of dopant concentration, temperature, etc. The conductivity ( u ) was found to increase by almost 10 orders of magnitude by using certain doping media and the the concentration (c) dependence followed a power law of the type u a c where n has a value between 5.5 and 6.0. The temperature dependence of conductivity revealed two distinct regions with the activation energy having low ( 0 . 3 -0 . 5 eV) and high ( 1 . 5 -2 . 5 eV) values, respectively. The x-ray diffraction studies show no major changes in the crystalline structure /crystallinity even at high doping levels. various findings have been explained on the basis of preferential diffusion of the dopant in the amorphous regions and the formation of a two-phase system. n These NCL Communication Number 4313. 291 Copyrjght 0 1988 by Marcel Dekker, Inc.