As an imitation of genuine leather, polyvinyl chloride (PVC) artificial materials are versatile, but suffers from being flammable due to the presence of large amounts of combustible plasticizers. Under such circumstance, intrinsically flame-retardant plasticizers displaying dual functions have been a subject of intensive research interest. However, previous strategies attempting to covalently attach flame-retardant moiety to plasticizers invariably required either expensive starting materials or laborious and tedious procedures, ultimately limiting their scale-up application in industry. In addition, driven by escalating demand of halogen-free flame retardants worldwide from an environmental health perspective, previously reported intrinsically flame-retardant plasticizers were mainly halogen-free, less attractive in PVC artificial material industry simply because PVC itself is a halogen-containing polymer. Here, we report an approach to introduce chlorine moieties into unsaturated fatty acid methyl ester by a simple addition reaction occurring on carbon-carbon double bonds, yielding a chlorine-containing, intrinsically flame-retardant bio-plasticizer. When combined with di-(2-ethylhexyl) phthalate (DOP) in PVC formulations, the chlorinated fatty acid methyl ester is qualified as a co-plasticizer while conferring flame retardancy upon the PVC coatings. This approach involves only a one-step procedure that employs renewable fatty acid methyl esters and cheap chlorine gas as raw materials, thus being of great potential to enable intrinsically flame-retardant bio-plasticizers on a large scale to manufacture functional PVC artificial materials for application in fire-prone scenarios.

中文翻译：

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一种简单的方法，可以扩大用于PVC人造材料的固有阻燃生物基增塑剂的规模

作为人造革的仿制品，聚氯乙烯（PVC）人造材料用途广泛，但由于存在大量可燃增塑剂而易燃。在这种情况下，显示双重功能的本质上阻燃的增塑剂已成为深入研究的主题。然而，先前试图将阻燃剂部分共价附于增塑剂的策略总是需要昂贵的起始材料或费力且乏味的程序，最终限制了它们在工业中的大规模应用。此外，从环境健康的角度出发，全球对无卤阻燃剂的需求不断增加，先前报道的本质上阻燃的增塑剂主要是无卤的，在PVC人造材料行业中，其吸引力之所以降低，仅仅是因为PVC本身是一种含卤素的聚合物。在这里，我们报告了一种通过在碳-碳双键上发生简单的加成反应将氯基团引入不饱和脂肪酸甲酯的方法，从而产生一种含氯的，本质上阻燃的生物增塑剂。在PVC配方中与邻苯二甲酸二（2-乙基己基）酯（DOP）结合使用时，氯化脂肪酸甲酯可作为助增塑剂使用，同时赋予PVC涂层以阻燃性。这种方法只涉及一个步骤，即使用可再生脂肪酸甲酯和廉价的氯气作为原料，