The influence of the activating agent on the controlled synthesis of polyacrylonitrile using systems based on copper(I) bromide and tris(2-pyridylmethyl)amine

The X-ray investigation of the macro-stresses and design for its realization (laboratory practicum)

“…Using the obtained polyacrylonitrile, post-polymerization was carried out, which also confirms the controlled nature of the polymerization. In a series of papers [53][54][55][56], efficient catalytic systems based on copper and its compounds for the controlled synthesis of copolymers of AN with MA and itaconic acid ethers were proposed. It was shown that the process of co-and terpolymerization with the participation of AN proceeds to a deep conversion and is characterized by a linear increase in molecular weight with conversion.…”

“…Moreover, the use of itaconic acid monomethyl ether, which, according to Chinese colleagues [86], has a favorable effect on the rheological properties of the copolymer, which ultimately positively affects the properties of the final product, turned out to be very promising. The industrial PAN precursor used to produce high-strength CFconsists of 95-99% AN units and also contains about 1% itaconic or acrylic acid and from 1 to 4% methyl acrylate or its analogues [18,53,89]. These comonomers, on the one hand, make the precursor heat treatment stage more manageable, and, on the other hand, play the role of an internal plasticizer in the process of thread drawing, improving the rheological properties of the copolymer solution [90].…”