在超临界二氧化碳介质中对淀粉进行受控接枝共聚乳酸。
Controlled graft copolymerization of lactic acid onto starch in a supercritical carbon dioxide medium.
机构信息
Hacettepe University, Chemical Engineering Department and Bioengineering Division, 06800 Çankaya, Ankara, Turkey.
Hacettepe University, Chemical Engineering Department and Bioengineering Division, 06800 Çankaya, Ankara, Turkey; Biyomedtek/NanoBiyomedtek, 06800 Çankaya, Ankara, Turkey.
出版信息
Carbohydr Polym. 2014 Dec 19;114:149-156. doi: 10.1016/j.carbpol.2014.07.077. Epub 2014 Aug 13.
This work presents a new approach for the synthesis of a starch-g-poly L-lactic acid (St-g-PLA) copolymer via the graft copolymerization of LA onto starch using stannous 2-ethyl hexanoate (Sn(Oct)2) as a catalyst in a supercritical carbon dioxide (scCO2) medium. The effects of several process parameters, including the pressure, temperature, scCO2 flow rate and reaction time, on the polymerization yield and grafting degree were studied. Amorphous graft St-g-PLA copolymers with increased thermal stability and processability were produced with a high efficiency. The maximum grafting degree (i.e., 52% PLA) was achieved with the following reaction conditions: 6h, 100°C, 200 bar and a 1:3 (w/w) ratio of St/LA. It was concluded that these low cost biobased graft biopolymers are potential candidates for several environment-friendly applications.
这项工作提出了一种通过在超临界二氧化碳（scCO2）介质中使用辛酸亚锡（Sn（Oct）2）作为催化剂，将 LA 接枝到淀粉上合成淀粉接枝聚 L-乳酸（St-g-PLA）共聚物的新方法。研究了几种工艺参数对聚合产率和接枝度的影响，包括压力、温度、scCO2 流速和反应时间。用这种高效的方法制备了具有高耐热性和加工性能的无定形接枝 St-g-PLA 共聚物。在以下反应条件下可获得最大接枝度（即 52% PLA）：6h、100°C、200 巴和 St/LA 的 1:3（w/w）比。结论是，这些低成本的生物基接枝生物聚合物是几种环保应用的潜在候选材料。
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