Controlled polymerisation and purification of branched poly(lactic acid) surfactants in supercritical carbon dioxide
Controlled polymerisation and purification of branched poly(lactic acid) surfactants in supercritical carbon dioxide
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DOI：
10.1039/c6gc00745g
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发表时间：
2016-01-01
期刊：
影响因子：
9.8
通讯作者：
Howdle, Steven M.
中科院分区：
文献类型：
--
作者：
Goddard, Amy R.;Perez-Nieto, Sara;Howdle, Steven M.
产品的可降解性、可持续性和低毒性推动了对生物基聚合物和表面活性剂合成的需求。在这里，我们报告的合成新的表面活性聚合物使用环酯（D，L-丙交酯）和温度敏感的多元醇（D-山梨醇）作为可再生的建筑块。我们强调的链长和支化度的修改提供了一条路线，以定制这些新化合物的性能和应用性能。通常需要高加工温度（>= 180摄氏度）和苛刻的反应后处理来去除残留的单体和催化剂，这些可能成为制造基于可再生资源的材料的障碍。在这里，我们利用超临界二氧化碳（scCO（2））作为绿色溶剂来克服这些挑战;显著降低反应温度，以窄分散度控制分子量，并减少副产物的形成。此外，在同一个锅中，我们可以使用超临界萃取来纯化化合物，并有效地去除未反应的试剂，这些试剂可以回收和循环使用。我们相信，我们的方法来生产和纯化这些新型支化聚（丙交酯）是一个重要的一步，朝着下一代生物聚合物和绿色表面活性剂的发展，结合使用生物来源的原材料和潜力，使用可持续的，低能耗的过程和技术。
Product degradability, sustainability and low-toxicity are driving demand for the synthesis of biobased polymers and surfactants. Here we report the synthesis of novel surface active polymers using cyclic esters (D,L-lactide) and temperature sensitive polyols (D-sorbitol) as renewable building blocks. We highlight the modification of chain length and degree of branching to provide a route to tailoring the properties and application performance of these new compounds. High processing temperatures (>= 180 degrees C) and harsh post-reaction treatments are often needed to remove residual monomer and catalysts and these can become barriers to creating materials based on renewable resources. Here we exploit supercritical carbon dioxide (scCO(2)) as a green solvent to overcome these challenges; significantly reducing reaction temperatures, targeting controlled molecular weights with narrow dispersities and reducing side-product formation. Additionally in the same pot, we can use supercritical extraction to purify the compounds and to efficiently remove unreacted reagents, which could be recovered and recycled. We believe that our approach to the production and purification of these novel branched poly(lactides) is a significant step towards the development of the next generation of biopolymers and green surfactants, combining both the use of bio-sourced raw materials and the potential to use sustainable, low energy processes and techniques.