- 學位論文
三元環與四元環環氧樹脂之光硬化流變學分析
The Study on Rheology of UV-Curable Oxetane and Epoxy Resin
摘要
本研究為探討環氧樹脂之雙官能基三元環(421P)與單官能基四元環(401)的動力學分析。將雙官能基三元環(421P)與單官能基四元環混合配製不同的當量莫耳比，如5：5、6：4；7：3、9：1等混合後，加入不同濃度的陽離子型光起始劑Chivacure 1176，如1、4.5、7、10 wt%，與單獨三元環(421P)加入上述的起始劑濃度，在室溫下經紫外光照射後形成網狀交聯結構，比較其加入四元環(401)環氧樹脂後的差異性。 流變儀於光硬化過程中陽離子樹脂在動態(dynamic)狀態產生黏彈性指標儲存模數(G’)經換算得到其流變轉化率，代入Malkin and Kulichikhin流變自催化方程式求其實驗轉化率以及k、m、n值進行實驗值與理論值比較。隨著加入起始劑濃度增加，可發現單獨三元環(421P)轉化率從25.01%提升提升至33.38%，對反應速率及轉化率明顯的提高，但在起始劑加至10%時，轉化率反而降低。 由雙官能基三元環(421P)與單官能基四元環(401)混合配製不同的當量莫耳比中發現，起始劑的添加量會依不同混合比例而影響最終轉化率。反應性單體混合隨著四元環(401)的比例增加，發現不只縮短反應時間，轉化率、轉化速率亦相對提升，所添加的光起始劑濃度皆存在一臨界值，超過此臨界值會依序降低轉化程度。
並列摘要
This study investigates the kinetic properties of cationic UV curable resin made by oxetane and double functional epoxy. The 3,4- Epoxycyclohexylmethyl -3,4-cyclo- hexanecarboxylate (421P) and 3-Ethyloxetane-3-methanol (401) were mixed with different equivalent molar ratios , such as 5：5, 6：4, 7：3, 9：1, 10 :0. The CHIVACURE 1176 was added in those formulations with different concentrations of 1%, 4.5%, 7%, 10%. The reactionsinitiated to form cross- linking networks by ultraviolet at room temperature. During the UV curing process of cationic resin, we can measured the viscoelastic indicator storage modulus in a dynamic state by Rheometer. Accroding to the Malkin and Kulichikhin eqution, caculated the coversion and k, m, n values based on the G’ results and compared to the experimental and the theoretical values. The final coversion of the three-membered ring resin (421P) increased from 25.01% to 33.38% with the higher concentration of 1176. It is also observed the same result of reaction rate. The final conversion decreased when the concentration up to 10%. When mixing with different molar ratio of 421P and 401, it is found that initatior will have different degrees of transformation. As the reactive monomer mixture increased four-membered ring (401), and found that not only shorten the reaction time, the conversion, improve the conversion rate relatively. Photoinitiator concentration are added there is a critical value exceeds this threshold will in turn reduce the degree of conversion.