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|標題:||Study of Converting Waste Polycarbonate With Urea/Glycols into PU Raw Materials
LIAW, WEI CHIH
In this research, new general processes of alkoxylation (ethoxylation and propoxylation) have been developed for converting polycarbonates (PC) into bis-phenol A (BPA) based diols for use in PU production.
Improvements in alkoxylation of phenol and BPA were accomplished in the initial stage of our study by using ethylene carbonate or propylene carbonate as the key reagents. Under the influence of sodium carbonate as the base catalyst at 170℃, high yields of mono-ethoxylated or propoxylated alcohol products for each phenol group were achieved. Further extension of similar alkoxylation chemistries, we could add urea directly into solution of phenols / BPAs to obtain the desired hydroxyl deriveatives. In this convient alkoxylation process, zinc oxide was found to be the suitable catalyst. The yield and selectivity of these urea-based alkoxylation were accomplished in the excess of 90%.
Different alkoxylation diols of BPA were synthesized from PC by our new alkoxylation process. They were used as raw materials in preparation of PU by an one-shot process. Now, we were able to produced high molecular weight PU with recycled diols.
and propoxylation) ; 總稱烯醚化(alkoxylation)]轉換聚碳酸酯(PC)成為BPA衍生的二元醇類，並且將其應用於聚胺酯(PU)的製作。
在最初階段，我們改進了以乙基碳酸酯或丙基碳酸酯作為酚與BPA乙烯醚化法的關鍵試劑，當在溫度170℃下，以及碳酸鈉(Na2CO3)為觸媒的影響下，可以得到酚團基上，以各接一個EO / PO單位取代的醇類。另外， 將烯醚化法更進一步的延伸，我們以尿素直接加入消化PC尚含EG/PG的反應溶液去得到醇類的產物，而ZnO為製備碳酸酯的適合觸媒，可獲得產率與選擇率大於90%的烯醚化產物。
|Appears in Collections:||化學工程學系所|
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