Determination of Optimum Glass Transition Temperature of Acrylic Acid Ester Copolymer to Improve Performance of Cement Matrixes

作者：Kim Seong Soo^*; Lee Jeong Bae; Cho Tae Jun; Hooton R Douglas

来源：ACI Materials Journal, 2014, 111(5): 521-529.

• acrylic acid ester
• glass transition temperature
• polymerization
• redispersible polymer powder

This study was conducted to determine an appropriate glass transition temperature of a polymer to improve performance of the polymer cement mortar and concrete. The glass transition temperature of the polymer, which was synthesized as a redispersible acrylic acid ester polymer, and physical properties of polymer cement mortar were evaluated. The polymer showed a lower glass transition temperature as the ratio of unsaturated hydrophobic ethylene monomer was increased. A decrease in glass transition temperature decreased the tensile strength, compressive strength, flexural strength, and volume change; increased the elongation, liquidity of polymer cement mortar, and adhesion; and delayed condensation. Scanning electron microscope and energy-dispersive X-ray spectroscopy results confirmed that a polymer film formed inside the cement matrix made mostly of carbon around pores and cracks inside the cement paste. A glass transition temperature of 0 to -11 degrees C (32 to 12.2 degrees F) showed the best results. These results can be used for developing novel construction materials.

• 出版日期2014-10