Research of the influence of external factors on copolymers based on unsaturated polyester resins

The article is devoted to the research of the influence of external factors on copolymers based on poly (propylene fumarate phthalate) and acrylic acid. In this paper, the effect of organic solvents and pH of the medium on the rate of swelling of synthesized copolymers is studied. The rate of polymer swelling depends on many factors, including: the nature of the polymer and the solvent, the presence of electrolytes, changes in pH and ambient temperature, the molecular weight of the polymer, and so on. It is assumed that the polymer network of copolymers consists mostly of unsaturated polyester resin links. Research results show that the ratio of monomer units in the copolymer significantly affects the susceptibility of the polymer gel to the pH of the medium and the presence of organic solvents (DMSO, DMFA, ethanol). It is proved that changing the properties of the comonomer allows you to obtain hydrogels that can swell or collapse due to changes in the ionic strength or thermodynamic quality of the solution. By varying the ratio of comonomers of the links was adjusted by the intervals of the swelling and compression of the polymer networks. The molecular weight of poly (propylene fumarate phthalate)was determined by gel-penetrating chromatography. The identification and composition of copolymers were determined by IR spectroscopy and HPLC, respectively.