在本研究中，使用下照式的DLP(digital light processing)光聚合技術，分析了樹脂性質對固化物件與樹脂槽底部拉拔力的影響。固化樹脂與由Teflon或PDMS組成的底材之間的拉拔力嚴重限制了3D列印中的列印速度。本研究對樹脂的轉化率、力學性能、表面能和收縮率進行了研究。為了控制這些特性，應用了三種線性和非線性光反應性寡聚體PC、PPG和PCL，以及反應性稀釋單體IBOA、CTFA、2-HEA、HDDA和TMPTA。
結果顯示，寡聚體和單體對拉拔力的影響不同。對於寡聚體來說，拉拔力隨著伸長率和接觸角的增加而增加，而楊式係數、抗拉強度和收縮率增加會導致拉拔力下降。對於單體來說，拉拔力隨著伸長率和接觸角的增加而增加，但隨著楊式係數、抗拉強度和收縮率的增加而降低。使用最小平方法評估所有參數的重要性以及每兩個參數之間的相互作用。從結果來看，通過改變寡聚體的伸長率與接觸角的相互作用會最有效地增加拉拔力。而單體的楊式係數與收縮率的相互作用會最有效地降低拉拔力。最後從寡聚體和單體的比較來看，寡聚體的伸長率與接觸角的相互作用對拉拔力的影響最大。
上述的機制可以通過固化樹脂和樹脂槽底材之間相互作用的能量平衡來解釋，高相互作用將增加分離所需的能量，這是通過寡聚體之間的低分子間作用力力導致的。固化單體的高楊式係數降低了分離的變形週期，也降低了分離能。
最後一部分研究了塑化劑和固化時間的影響，將不同的塑化劑DBP、DOP和TCP添加到光固化樹脂中。結果顯示，塑化劑降低了黏度，從而提高了轉化率，高轉化率降低了拉拔力。相反的，塑化劑使固化樹脂變得更柔軟，從而增加了拉拔力。整體而言，塑化劑對拉拔力的影響不明顯。
在這項研究中，討論了光固化樹脂中寡聚體、單體和添加劑的影響。結果顯示，降低寡聚體的伸長率、增加單體的楊式係數和添加塑化劑將有效的降低光聚合3D列印中的拉拔力。

In this study, the bottom-up DLP (digital light processing) photopolymerization technology is used, followed by analyzing the effects of resin properties on the adhesive force between cured product and the bottom of resin tank. The adhesive force between cured resin and bottom layer composed of Teflon or PDMS membrane seriously limits the printing speed in the 3D printing. The conversion rate, mechanical properties, surface energy and shrinkage of resin were studied in this research. To control these properties, three linear and nonlinear photoreactive oligomers, PC, PPG, and PCL, and reactive diluent monomers, IBOA, CTFA, 2-HEA, HDDA and TMPTA, were applied.
The results indicate that the effects of oligomers and monomers were different. For oligomers, the adhesive force increased with elongation and contact angle. On the other hand, Young’s modulus, tensile strength and shrinkage resulted in a decrease in adhesive force. For monomers, the adhesive force increased with elongation and contact angle, but decreased with Young’s modulus, tensile strength and shrinkage. The least squares method was used to evaluate the importance of all parameters and interactions between every two parameters. The result shows that by varying oligomers, the elongation/contact angle interaction of oligomers would increase adhesive force most efficiently, and Young’s modulus/shrinkage interaction of monomers would decrease adhesive force most efficiently. From the comparisons between oligomers and monomers, the elongation/contact angle interaction of oligomers played the most important role in the adhesive force.
The above mechanisms would be explained by the energy balance on interforces between cured resin and tank bottom. The high interforce increased the required energy for separation, which was achieved by the low intermolecular force between oligomers. The high Young’s modulus of cured monomers decreased the deformation period in separation, which decreased the separation energy, too.
In the last part, the effects of plasticizers and curing time were investigated. Different plasticizers, DBP, DOP and TCP were added to the photocurable resin. The results show that the plasticizers reduced the viscosity, and thus enhanced the conversion. High conversion decreased the adhesive force. On the contrary, the plasticizers made the cured resin softer, which increased the adhesive force. Overall, the plasticizers would not influence the adhesive force seriously.
In this study, the effects of oligomers, monomers and additives in photoresin were discussed. The results suggest that the decrease of oligomers’ elongation, the increase of monomers’ Young’s modulus and the addition of plasticizers would effectively reduce the adhesive force in photopolymerization 3D printing.

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