S. N. Salazkin

GENERAL FEATURES OF THE REACTION OF 4,4'-DIFLUOROBENZOPHENONE WITH POTASSIUM DIPHENOXIDE OF 2,2-BIS(4-HYDROXYPHENYL)PROPANE

AbstractThe major factors determining molecular weights of polyarylene-ether ketones formed by the reaction of 4,4′-difluorobenzophenone with 2,2-bis(4-hydroxyphenyl)propane in the presence of K2CO3 were revealed. The optimum conditions for the preparation of high-molecular-weight polymers were found, and it was demonstrated that it is possible to control their molecular weights (n

NMR study of phthalide-type poly(phenylene)s. Symmetry and additivity

bar M_W

Transparent conductive polymers for laminated multi-wire metallization of bifacial concentrator crystalline silicon solar cells with TCO layers

n from 10 000 to 200 000).

Synthesis of poly(arylene ether ketones) with terminal phenolic groups

New activated phthalide-containing dihalogeno derivatives were synthesized, and cardo polyarylene ether ketones based on them were prepared. The effect of the type of the halogen atom (fluorine, chlorine, or bromine) on the efficiency of polycondensation was estimated. It was demonstrated that high-molecular-weight cardo polyarylene ether ketones can be obtained only from the difluoro derivative. The synthesized polymers are amorphous compounds characterized by high glass transition temperatures (210–250°C). These polymers are soluble in many organic solvents and form strong transparent films.

3,3-Bis[4-(4'-fluorobenzoyl)phenyl]phthalide as a new monomer for the synthesis of cardo polyarylene-ether ketones

All 1H and 13C NMR signals of the four poly(phenylenephthalides): polydiphenylenephthalide (P(DPh)‐1), polyterphenylenephthalide (P(TPh)‐2) and two sequentially ordered polymers with different ratios of alternating diphenylenephthalide and terphenylenephthalide units (P(DTPh)‐3, P(DDTPh)‐4) were assigned unequivocally with two‐dimensional NMR techniques (1H–1H COSY and NOESY; 1H–13C HSQC and HMBC). There are four types of polyphenylene fragments: not symmetrical end, symmetrical inner, symmetrical pre‐end and formally symmetric pre‐end. The equivalent carbon atoms in these fragments have different chemical shifts. A full additivity of the chemical shifts for the side phthalide and polyphenylene carbon atoms was revealed. A new structure of diads with a mirror symmetry plane, passing through the middle of aromatic moieties, is proposed. Copyright

Bifacial IFO/(n + pp + )Cz-Si/ITO silicon solar cell with advanced Ag-free multi-wire metallization attached to TCO layers by transparent conductive PAES copolymers

Abstract Cyclization reactions accompanying the nucleophilic displacement polymerization of bisphenol A and difluorobenzophenone (DFB) were studied. Size distribution and amounts of cyclic species were determined depending on the concentration and isomerism in DFB. Experimental cyclization constants were found to be consistent with the values calculated using Jacobson and Stockmayer’s theory for a freely rotating chain of virtual bonds in the case of 4,4’-DFB. For 2,4’-DFB, hindered rotation around some virtual bonds should be taken into account.