Aromatic polymers obtained by precipitation polycondensation: 4. Synthesis of poly(ether ketone ketone)s☆
Abstract High molecular weight aromatic poly(ether ketone ketone)s were synthesized by the Friedel-Crafts polyacylation condensation of iso- and terephthaloyl chlorides with diphenyl ether, 1,4- and 1,3-bis(4-phenoxybenzoyl)benzenes. Depending on the monomers used for polycondensation, polyketones of regular structure with different iso-/tereisomer repeating unit ratio ( 100 0 , 50 50 , 0 100 ) in the main chain were obtained. Polymers of each repeating isomer unit were prepared in two different ways. All the polymer syntheses were performed as precipitation polycondensations and the resulting polymers were obtained in particle form. The influence of reaction conditions and preparation route on the polymer properties were examined. The monomer concentration and monomer stoichiometric ratio were found to affect the polymer viscosity. The size and shape of the polyketone particles obtained were also found to be governed by reaction conditions and preparation route.
Investigation of the synthesis and of some properties of polyketones from diphenyl oxide and iso- and terephthaloyl chloride
The polycondensation of diphenyl oxide with isophthaloyl chloride in methylene chloride and nitrobenzene has been studied and optimum conditions of the polyketone synthesis were established. The effect of the chemical structure of homo- and copolymers of diphenyl oxide and iso- and terephthaloyl chloride on their properties is investigated. 
 
 
 
Die Polykondensation von Diphenylether mit Isophthalsauredichlorid in Methylenchlorid und Nitrobenzen wurde untersucht und optimale Bedingungen fur die Polyketonsynthese ermittelt. Ferner wurde der Einflus des chemischen Aufbaus von Homo- und Copolymeren aus Diphenylether und den Saurechloriden der Iso- und der Terephthalsaure auf die Eigenschaften untersucht.
Using Infrared Thermography to Detect Moisture in Historic Masonry: A Case Study in Indiana
Nondestructive testing mapped water infiltration in the decoratively painted interior of a Masonic Temple in Muncie, Indiana.