摘要： 【目的】提高光固化丙烯酸酯树脂的交联密度，优化其热稳定性、力学性能和耐水性。【方法】以丙烯酸缩水甘油酯（GMA）、甲基丙烯酸甲酯（MMA）、丙烯酸丁酯（BA）为原料，合成了环氧丙烯酸酯预聚物。随后以环氧丙烯酸酯预聚物、丙烯酸（AA）为原料，成功制备可 UV固化不饱和丙烯酸酯预聚物（UEA1~UEA3），并制备了相应的固化膜。通过 FT-IR、¹H MNR、DTG、DSC、DMA对固化膜进行了表征，测试了固化膜的吸水率、水接触角、拉伸性能等。【结果】成功制备了环氧丙烯酸酯预聚物及不饱和丙烯酸酯预聚物；GMA用量的增加及不饱和键的引入显著提高了 UEA的交联密度，增强了固化膜的拉伸强度，同时没有导致过低的断裂伸长率；随着交联密度的增加，固化膜的玻璃化转变温度显著升高；且固化膜的热分解温度呈现上升趋势；固化膜的交联密度增大显著增强了其表面疏水性。当 GMA质量分数为 29. 29%时，UEA2展现出良好的综合性能，避免了过度交联和内部缺陷导致的低温分解，具有稳定的交联结构，水接触角为 82°，吸水率为 1. 04%，断裂伸长率为 6. 36%，T5%为 265. 83 ℃，拉伸强度达到 17. 37 MPa。【结论】固化膜的交联密度作为影响力学性能和热稳定性的主要因素，在这一合成路径中可以得到有效控制。

关键词: UV固化, 接枝改性, 丙烯酸酯, 环氧基团改性, 交联

Abstract: ［Objective］ In order to enhance the cross-linking density of light-curing acrylateresins and optimize their thermal stability，mechanical properties，and water resistance，a research study was conducted.［Methods］In this paper，epoxy acrylate prepolymers were synthesized usingglycidyl acrylate（GMA），methyl methacrylate（MMA），and butyl acrylate（BA） as raw materials. Subsequently，UV-curable unsaturated acrylate prepolymers（UEA1-UEA3） were prepared usingepoxy acrylate prepolymer precursors and acrylic acid（AA）as raw materials，and the correspondingcured films were prepared. The cured films were characterized by FT-IR， ¹H MNR，DTG，DSC，DMA， and the cured films were tested for water absorption，water contact angle，and tensile properties.［Results］The results demonstrated the successful preparation of epoxy acrylate prepolymer andunsaturated acrylate prepolymer. The enhancement of crosslink density in UEA，attributable to the increase of GMA dosage and the introduction of unsaturated bonds，directly augmented the tensilestrength of the cured films without compromising their elongation at break. With the rise in crosslink density，a substantial enhancement in glass transition temperature was observed for the cured films.Furthermore，an upward trend was evident in the thermal decomposition temperature of the cured films.The thermal decomposition temperature of the cured film exhibited an upward trend，and the increase in crosslink density of the cured film significantly enhanced its surface hydrophobicity. When the massfraction of GMA was 29. 29%，UEA2 exhibited optimal comprehensive performance，circumvented the low-temperature decomposition caused by excessive cross-linking and internal defects，and possessed a stable cross-linking structure. The water contact angle was 82°，the water absorption rate was 1. 04%， the elongation at break was 6. 36%，the T5% was 265. 83 ℃，and the tensile strength reached 17. 37 MPa.［Conclusion］The crosslink density of the cured film，as a major factor affecting mechanical properties and thermal stability，can be controlled in this synthesis pathway. 

Key words: UV curing, graft modification, acrylate, epoxy group modification, crosslinking

中图分类号: 

• TQ637. 83