Study of alternatives for preserving enamelled goldware using thermoplastic acrylic resin via scientific examination
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Abstract
Four conservation-grade thermoplastic polymers (PB-44, PB-48N, PB-67, and PB-72) were investigated as potential materials for conserving enamel objects. The research aimed to determine the appropriate concentration of Paraloid resin and solvents for forming a film on a silver test plate with a grooved surface. To enhance film visibility, an acrylic green additive, used in King "Ra cha wa dee" enamels, was added. A 20% w/w concentration of Polymer resin with toluene as the solvent showed bubble-free films with no residual resin lumps or pigment additive clumping. The films (PB-44, PB-67, and PB-72) exhibited high transparency, ranging from 98% to 99%, except for PB-48N, which showed a transparency of 77.65%. Each polymer had unique characteristics: PB-44 was strong (Young's modulus of 827.94±50.87 MPa), PB-72 was flexible (elongation at break of 22.10±1.55 %), PB-48N was viscous, and PB-67 had a hard, hydrophobic surface. The films exhibited high thermal stability with degradation temperatures exceeding 200°C and glass transition temperatures over 50°C. They could be readily removed using toluene, acetone, or xylene, without residue. This research provides valuable insights into the properties of Polymer resin films for preserving enamelled goldware, especially in Thailand's tropical climate. These findings are crucial for effective conservation and restoration efforts.
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