Synthesis and Properties of Optically Transparent Polymer on the Basis of 4-(2-Carboxycyclopropyl)styrene and Acrylonitrile
S. B. MAMEDLI
Institute of Polymer Materials, National Academy of Sciences of Azerbaijan, Sumgait, Azerbbaijan
Keywords: copolymerization, polyfunctional copolymers, optically transparent copolymers, refraction index, light transmission
Pages: 388-394
Abstract
A new cyclopropane-containing optically transparent copolymer has been obtained by radical copolymerization of 4-(2-carboxycyclopropyl)styrene (CCPS) with acrylonitrile (AN), and its characterization was carried out. The structural peculiarities of the obtained polymer and the basic regularities of the studied process are investigated, the useful properties of the obtained compound are revealed, and the possible areas of its practical use are considered. It is established by means of turbidimetric analysis that the obtained polymer products are true copolymers, and not a mixture of two homopolymers. It is shown that copolymerization reactions proceed with opening of the double bond of the vinyl group in CCPS and AN. Copolymerization constants are measured ( r 1 = 0.7 and r2 = 0.15), Q-e Alfrey-Price parameters ( Q 1 = 0.267, е1 = -0.30) and microstructures of the copolymer are determined. During radical copolymerization, CCPS shows higher activity in comparison with AN. It is revealed from the microstructural parameters of the copolymer of CCPS with AN that the minimal blocking occurs in the range of M1 / M2 ~ (50 : 50)-(25 : 75), where M1, M2 are the fractions of CCPS and AN, respectively, mol. %. It is revealed that the radical copolymerization of CCPS with AN in the bulk allows obtaining the polymer with high purity in comparison with copolymerization of the monomers in the benzene solution. For obtaining the copolymer with the highest light transmission, comonomer ratio CCPS/AN should be 75 : 25 mol. %. The physical-mechanical, thermophysical, optical properties of the obtained copolymer are determined. In comparison with polystyrene and the copolymer of styrene with AN, the synthesized new copolymer possesses higher heat resistance, tensile strength and water absorption. It is established that the synthesized copolymer samples are characterized by good light transmission (87 %) and optical transparency ( nD20 = 1.5898). The copolymer of CCPS with AN possesses higher light transmission and refraction index than the copolymer of styrene with AN. The change rate of the light transmission index of copolymer of CCPS with AN depending on the composition of the synthesized polymer is investigated.
DOI: 10.15372/CSD2022395
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