樹枝狀水性PU壓克力樹脂之合成與紫外光硬化動力學探討

The Study on Synthesis and Kinetics of UV Curing Type Waterborne Polyurethane Acrylate Dendrimer

蘇哲盟(Che-Meng Su)

指導教授 ： 芮祥鵬

國立臺北科技大學/工程學院/有機高分子研究所/碩士(2011年)

摘要

本實驗主要以樹枝狀高分子(Dendrimer)，其具有高度分枝的球狀立體結構作為核心，合成不同官能基數的聚氨酯水性壓克力樹狀高分子(PU-acrylate Dendrimer)；包含了HDI及HMDI系統。在反應的過程中，分別藉由紅外線光譜儀(FT-IR)、介質輔助雷射脫附游離/飛行時間質譜 (MALDI-TOF-MS)和核磁共振光譜儀(H-NMR)進行結構的鑑定。本實驗中樹脂分別含有5、9、13個不同的官能基數，加入不同濃度的光起始劑(Photoinitiator)DC-1173，在不同的環境溫度20、40、60、80℃下，經UV光照射後，探討其光硬化動力學(Kinetic)之反應速率和轉換率(Conversion)差異，主要測試儀器為DPA(Double Beam Photocalorimetric Accessory) 。從實驗結果可發現隨光起始劑濃度添加到最佳光起始濃度之前其轉換率、反應速率及反應級數皆會變大，到達最佳光起始劑濃度後轉換率、反應速率、反應級數下降，推測可能是因為大量的自由基快速的再結合而導致。而隨著反應溫度的提升其反應速率、轉換率、反應級數也會隨溫度提高而提升。但在80℃下，其反應速率、反應級數反而下降，推測應為高溫下會破壞光起始劑，導致反應率降低。

關鍵字

轉換率 ； 動力學 ； 光起始劑 ； 樹枝狀高分子 ； 反應速率

並列摘要

The polymer used in this study is PU-acrylate dendrimer with a highly-branched spherical 3D structure as its core and different numbers of functional groups. It contains two systems: HMDI and HDI system; with five, nine and thirteen functional groups respectively. In the course of the reaction, the resin was characterized by Fourier Transform Infrared Spectroscopy (FTIR), H-NMR and MALDI-TOF respectively. The resin was added into the solution with different concentration of Photoinitiator (DC-1773) and exposed to UV-light at different temperature, i.e. 20, 40, 60 and 80 °C, respectively in order to explore the effects of UV-curing kinetic and conversion. The major test equipment used in this experiment is DPA (Double Beam Photocalorimetric Accessory). From the results of the experiment, we discovered that the conversion, reaction rate and reaction order all increased before the concentration of Photoinitiator reached to the optimal level. After reaching the certain optimal concentration, the conversion, reaction rate and reaction order all decreased presumably due to the rapid recombination of numerous free radicals. Similarly, the conversion, reaction rate and reaction order also increased with the increasing reaction temperature.

並列關鍵字

conversion ； kinetic ； photo-initiator ； dendrimer ； reaction rate

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