K. F. Shuhaibar

The synthesis and characterization of polymerizable azo-naphthols for use in polymeric materials

Esterification of 1(2-nitrophenylazo)2,3-dihydroxynaphthalene and of 1(2-nitrophenylazo) 2,7-dihydroxynaphthalene and their methoxy and chloro derivatives with acryloyl chloride occurred at the 3- and 7-positions respectively and gave the acryloyloxyazo monomers in 40–63% yield. The acryloyloxy monomers were fully characterized by their infrared, ultraviolet and 1H and 13C NMR spectra. Their copolymerization with styrene was studied.

GRAFT-COPOLYMERIZATION OF PVC WITH POLYMERIZABLE UV ABSORBERS

SummaryPolyvlnyl chloride has been grafted with two different monofunctional polymerizable ultraviolet (UV) absorbers, 4-methacryloyloxy-2-hydroxybenzophenone and 2(2-hydroxy-4-methacryloyloxyphenyl) 2H-5-methoxy-benzotriazole. PVC was activated by dehydrochlorinating it in pyridine and subsequently grafted with the monomeric UV absorbers in tetrahydrofuran by free radical polymerization. The molar masses of the resulting grafted polymers and the distribution of the UV absorber moleties along different molar mass fractions were determined by GPC. It was shown that in addition to the grafting reaction, recombination of the DHPVC and homopolymerization of the UV absorber molecules take place.

Polymeric azo pigments

Summary1-(2-Nitrophenylazo)-2-hydroxy-acryloyloxynaphthalenes were polymerized and copolymerlzed with styrene In dichloroethane using AIBN as the Initiator. The resulting colored polymers were characterized by U.V. spectroscopy and their molar masses were determined using Size Exclusion Chromatography. It was shown that the obtained products consist of mixtures of the appropriate copolymers and homopolymerized acryloyl-azo naphthols.