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Ring-opening dispersion polymerization of L-lactide initiated by L-arginine in supercritical carbon dioxide
Polymer Degradation and Stability ( IF 5.9 ) Pub Date : 2019-12-10 , DOI: 10.1016/j.polymdegradstab.2019.109049
Shiping Zhan , Zetao Wan , Yu Zhao , Jingchang Wang , Zhiyi Li

The ring-opening dispersion polymerizations of l-lactide (L-LA) were carried out with ScCO2 as the green solvent, l-arginine (L-Arg) as an initiator and PCL-PDMS-PCL triblock copolymer as the stabilizer. The poly (l-lactide) (PLLA) products were obtained with a good disperse powders (9–22 μm), a higher number-average molecular weight (11700 g/mol), a better molecular weight distribution (PDI) (1.31) and a lower reaction temperature (150 °C). The synthesis mechanisms and synthesis procedures of the polymerization reaction were presented. The optimum reaction conditions were obtained under the pressure of 12 MPa and the reaction time of 48 h. The kinetic process of the reaction was discussed and the results showed that the reaction was controllable polymerization and a first order kinetic reaction.



中文翻译:

L-精氨酸引发的L-丙交酯在超临界二氧化碳中的开环分散聚合

以ScCO 2为绿色溶剂,以1-精氨酸(L -Arg)为引发剂,以PCL-PDMS-PCL三嵌段共聚物为稳定剂进行1-丙交酯(L -LA)的开环分散聚合。聚(l丙交酯)(PLLA)产品具有良好的分散粉末(9–22μm),更高的数均分子量(11700 g / mol),更好的分子量分布(PDI)(1.31)和更低的反应温度(150°C)。介绍了聚合反应的合成机理和合成步骤。在12 MPa的压力和48 h的反应时间下获得了最佳反应条件。讨论了反应的动力学过程,结果表明该反应是可控的聚合反应和一级动力学反应。

更新日期:2019-12-11
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