The synthesis of novel copolymer acrylicacid-Co-N-(substitutedphenyl-1,3,4thiadiazole acryl methylamine copolymer into three steps was achieved by the reaction benzoic acid derivatives with thiosemicarbazide presence of phosphorous oxychloride(pocl3) to from compound 2-Amino-5-(substitutedphenyl)-1,3,4-thiadiazole. The purified products were reacted with allyll chloride to from compounds 2-N-(allyl amino)-5-(substituted phenyl)-1,3,4-thiadiazole). Finally the copolymers were synthesized by the free radical of compounds (B1-B5) with acrylic acid by using AIBN as initiator. All the prepared compounds (A1-A5), and (B1-B5) have been characterized based on(FT-IR), and (p1-p5,) based on (FT-IR, 1HNMR, GPC, TGA,) techniques. The polymers were used as additives to PVC in calculated percentages and composites were irradiated with UV light for 300h and found to be good Photostabilization. The adhesion strength for the polymers were evaluated by using single-lapshear method. The Solubility of the polymers where ested against some solvents the polymers were soluble in some of them.

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