Synthetic polymers are attracting growing attention as additives for laundry and personal care products. In particular, the high volatility of many common fragrances requires the development of polymeric particles for their encapsulation and controlled release. Unfortunately, the vast majority of these carriers is made from polymers that are not biodegradable. This poses severe concerns about the accumulation of nano- and microplastics. Hence, such particles are expected to be banned from the market in the coming years. Therefore, biodegradable particles enabling a long-lasting release of the fragrances are urgently needed. In this work, we produced biodegradable nanoparticles (NPs) that are structurally composed of lactones, i.e. well known perfumes that occur naturally and that are already considered safe by regulatory agencies. We polymerized these lactones via ring opening polymerization (ROP) using an ionizable tertiary amine as initiator to produce in a single step amphiphilic oligoesters able to directly self-assemble into NPs once nanoprecipitated in water. In this way, we can produce biodegradable NPs with a perfume loading up to 85 % w/w without the need for additional surfactants. Subsequently we show that the ionizable group is able to confer a positive charge to our nanoparticles and, in turn, a high adsorption capacity on natural fibers (i.e. hairs and cotton fabric). Finally, we demonstrate the nanoparticle resistance to rinsing and their ability to confer a long-lasting fragrance perception to treated hair swatches for at least 3 weeks.

中文翻译：

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不含表面活性剂和耐冲洗性的可生物降解纳米粒子，在天然纤维上具有高吸附力，可持久释放香料。

合成聚合物作为洗衣和个人护理产品的添加剂正受到越来越多的关注。特别地，许多常见香料的高挥发性要求开发用于封装和控制释放的聚合物颗粒。不幸的是，这些载体的绝大多数是由不可生物降解的聚合物制成的。这引起对纳米塑料和微塑料积累的严重关注。因此，预期在未来几年中将这种颗粒从市场上禁止。因此，迫切需要能够持久释放香料的可生物降解颗粒。在这项工作中，我们生产了可生物降解的纳米颗粒（NPs），其结构上由内酯组成，即自然产生的众所周知的香料，并且已经被监管机构认为是安全的。我们使用可电离的叔胺作为引发剂，通过开环聚合（ROP）聚合了这些内酯，以一步生成两亲性低聚酯，一旦在水中进行纳米沉淀，它们就可以直接自组装成NP。通过这种方式，我们可以生产出可生物降解的NP，且香料含量高达85％w / w，而无需其他表面活性剂。随后，我们证明了可电离的基团能够给我们的纳米粒子带来正电荷，进而对天然纤维（即头发和棉织物）具有高吸附能力。最后，我们证明了纳米粒子对漂洗的抵抗力以及它们为处理后的发卡赋予持久香气感的能力至少3周。