超低温用紫外光快速固化丙烯酸酯树脂体系的制备及性能

Rapid ultra violet (UV)-curable acrylate resin system used at ultra-low temperature (liquid nitrogen) were prepared by using polyetherketone cardo (PEKC) as the filler, and their curing behavior and tolerance of liquid nitrogen temperature were studied. The gel fraction and curing shrinkage of PEKC/acrylate resin system were measured; then the coefficient of linear thermal expansion (α) of the cured PEKC/acrylate resin systems was characterized by DMA to determine its dimensional stability as the temperature varied from -150 to 50℃; finally, the tensile properties and lap shear strengths at room temperature and liquid nitrogen temperature were also investigated and analyzed to confirm their ultra-low temperature tolerance. The results indicate that, PEKC/acrylate resin systems with 0-4% (mass ratio to the acrylate resin) PEKC content can be efficiently rapidly cured in 5 s as the gel fraction reaches more than 80%. When the mass ratio of PEKC to acrylate resin systems increases from 0 to 4%, the α of PEKC/acrylate resin systems decreases from 6.71×10 ^-5 ℃ ^-1 to 5.29×10 ^-5 ℃ ^-1 with decreasing the volume shrinkage from 25.61% to 6.24% and the linear shrinkage from 1.78% to 0.41%. Additionally, the toughness of the PEKC/acrylate resin systems increases as the elongation at break of the acrylate resin systems gradually increases, and the tensile strength of PEKC/acrylate resin systems is more than 20 MPa. The lap shear strength of PEKC/acrylate resin system with 3% (mass ratio to the acrylate resin system) PEKC content at room temperature and liquid nitrogen temperature are 17.48 MPa and 17.23 MPa, respectively.