本研究為合成具有不同取代位置之六元環型碳酸酯單體1,3-
dioxan-2-one (CC1)、5,5-dimethyl-1,3-dioxan-2-one (CC2)、4,6-dimethyl
-1,3-dioxa-2-one (CC3)、6-methyl-4-phenyl-1,3-dioxan-2-one(CC4)與雙環型碳酸酯單體4H-benzo[d][1,3]-dioxin-2-one (CC5)、6-nitro-4H-
benzo-[d][1,3]dioxin-2-one (CC6)、6-bromo-3,4-dihydronaphthalen-2
(1H)-one (CC7)，以methyl trifluoromethane sulfonate (CH3OSO2CF3，MeOTf)作為陽離子開環反應起始劑反應，對其生成物之化學結構及反應機制做具體而微的探討；並且嘗試在光起始劑－双苯基碘基鹽(diaryl iodonium salt, DPI)的存在下，經UV光照射進行陽離子光聚合反應。實驗結果顯示僅單體CC1-CC2可經UV光照射反應，所得之高分子產物相較於傳統路易士酸起始之陽離子聚合反應有著較低之副反應比率。

This work dealt with the cationic ring-opening polymerization of the
different substituted six-membered cyclic carbonates 1,3-dioxan-2-one
(CC1), 5,5-dimethyl-1,3-dioxan-2-one (CC2), 4,6-dimethyl-1,3-dioxa-2
-one (CC3), 6-methyl-4-phenyl-1,3-dioxan-2-one(CC4) and the bicyclic
carbonates 4H-benzo[d][1,3]-dioxin-2-one (CC5), 6-nitro-4H-benzo-[d]-
[1,3]dioxin-2-one (CC6), 6-bromo-3,4-dihydronaphthalen-2(1H)-one
(CC7). The polymerization was carried out with methyl trifluoromethane
sulfonate as the initiator. The mechanisms and polymer structures were
discussed clearly. Attempts of photoinitiated cationic ring-opening
polymerization of CC1-CC7 with diphenyliodonium hexafluoro-
phosphate as the initiator have been made. The results suggest that only
CC1 and CC2 can be reacted. The photoinitiated cationic ring-opening
polymerization suppressed the side-reaction more effectively than
conventional cationic ring-opening polymerization.

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