探討聚酯壓克力樹脂配方對性質之影響

Effect of Formulation on Properties of Polyester Acrylate Resins

本研究是利用 UV-A 波段之紫外光來固化不同成份及不同組成的聚酯壓克力樹脂，結果發現在氮氣的環境中照光 20 分鐘後可使樣品硬化。在固定光起始劑含量 2 wt%而改變寡聚物和單體比例時，含雙官能基或三官能基單體之壓克力，其起始解溫度隨單體比例增加而變大，含單官能基單體之壓克力則隨單體比例增加而變小；含雙官能基或三官能基單體之壓克力，其熱膨脹係數隨單體比例增加而變小，含單官能基單體之壓克力則隨單體比例增加而變大；而改變寡聚物和單體比例，則對玻璃轉化溫度沒有影響。且三官能基單體之壓克力樹脂具有最高的起始裂解溫度、最小的熱膨脹係數、及較高的玻璃轉化溫度。在固定寡聚物和單體含量而增加光起始劑含量時，無論使用何種單體，其起始裂解溫度均會變低、熱膨脹係數均變大、玻璃轉化溫度均下降。

UV-A light is applied to cure polyester acrylate resins of various compositions. In this study, in one experiment, the specimens were cured for a fixed duration of 20 minutes by UV-A irradiation under nitrogen atmosphere. The percentages of oligomers and monomers varied, and the photoinitiator content was fixed at 2 wt%. The initial decomposition temperatures of the specimens containing two- or three-functional group monomers increased with increasing monomer percentages. The thermal expansion coefficient of acrylate resins containing two- or three-functional group monomers decreased with increasing monomer percentages. Nevertheless, these trends contrasted with those of the specimens containing single-functional group monomers. The monomer used has no obvious influence on the glass transition temperature of the acrylate resins. The specimens containing three-functional group monomers had the highest initial decomposition temperatures, lowest thermal expansion coefficients, and higher glass transition temperatures. In another experiment, the percentages of oligomers and monomers were fixed, and the photoinitiator content was increased. Regardless of the monomer used, the initial decomposition and glass transition temperatures of the specimens decreased and the thermal expansion coefficient of the specimens increased.