Three urethane methacrylates, one monofunctional derivative and two di-functional derivatives with different chain lengths were used as reactive diluents in UV-curable polyester powder coatings. Each reactive diluent was formulated with a methacrylated polyester oligomer using conventional melt extrusion techniques. The effect of these compounds on zero-shear melt viscosity was investigated. Incorporation of 10 wt% reactive diluent effectively reduced the viscosity by an order of magnitude. After UV-curing, the viscoelastic, thermal, and mechanical properties of the films were characterized using dynamic mechanical analysis, differential scanning calorimetry, thermogravimetric analysis, and tensile tests. The type and concentration of reactive diluent that was used directly influenced the glass transition temperature, modulus, % elongation-at-break, and crosslink density. Of the two di-functional reactive diluents that were used, the derivative that contained a shorter methylene spacer group resulted in more heterogeneous crosslinked networks.

在紫外线固化的聚酯粉末涂料中，使用三种氨基甲酸酯甲基丙烯酸酯，一种单官能衍生物和两种不同链长的双官能衍生物作为反应性稀释剂。使用常规的熔融挤出技术，将每种反应性稀释剂与甲基丙烯酸酯化的聚酯低聚物一起配制。研究了这些化合物对零剪切熔体粘度的影响。掺入10重量％的反应性稀释剂可有效地将粘度降低一个数量级。紫外线固化后，使用动态力学分析，差示扫描量热法，热重分析和拉伸试验对薄膜的粘弹性，热和机械性能进行表征。使用的反应性稀释剂的类型和浓度直接影响玻璃化转变温度，模量，断裂伸长率％和交联密度。在使用的两种双官能反应性稀释剂中，包含较短亚甲基间隔基的衍生物导致了更多种异构的交联网络。