DEVELOPMENT OF HYDROPHILIZED UNSATURATED POLYESTER RESINS BASED ON DIFFERENT TYPES OF MODIFIERS
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- TITLE: DEVELOPMENT OF HYDROPHILIZED UNSATURATED POLYESTER RESINS BASED ON DIFFERENT TYPES OF MODIFIERS
- ABSTRACT: This work presents the modification of unsaturated polyester resin (UPER) with different types of hydrophilizing components – sodium hydroxide, sulfur and sulfate-resistant cement. A different type of hydrophilized unsaturated polyester resin (HUPER) was obtained based on this processing. The varieties of HUPER so obtained were compared on the basis of their hardening kinetics. When sodium hydroxide is used as a hydrophilizing agent minimum amounts of sodium hydroxide make it possible to choose a minimum gelation time. Unlike the sodium hydroxide, the hydrophilizing agent sulfur demonstrates that the increase in its amount results in lower gelation temperatures and increases the gelation time. A special feature of the third hydrophilizing agent sulfate-resistant cement was identified, whose amount does not affect the gelation time, i.e. it is maintained within certain limits (27-29 min). A comparison of strength values was made. With the hydrophilizing agent sodium hydroxide the test pieces retain their strength values in a broader range (2.99-4% tensile elongation, 14.98-18.62 MPa tensile strength, 1056.81-581 MPa Young’s modulus). Where the hydrophilizing agent is sulfur these values are the lowest, and the sulfate-resistant cement increases to the greatest extent the tensile strength values (24.19 MPa) and percent tensile elongation values (8.23%), and to the lesser extent – the Young’s modulus values (389.25 MPa).
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