Simple in situ synthesis of copolymer compatibilizers for plastics recycling

用于塑料回收的共聚物增容剂的简单原位合成

• 批准号: 513459-2017
• 负责人: Gauthier, Mario
• 金额: $ 1.82万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=640178
• 关键词: Simple; situ; synthesis; copolymer; compatibilizers

Post-consumer plastics recycling is strongly hampered by the fact that heterogeneous polymer feeds areintrinsically immiscible, which leads to phase separation within the mixture and typically very poor mechanicalproperties for the recycled products. A well-established method to improve the degree of dispersion in polymerblends and to improve the mechanical properties is through the use of block and graft copolymer additives ascompatibilizers. Unfortunately these materials are generally very expensive to synthesize, and therefore notamenable to large scale plastics recycling. We now suggest a methodology to generate graft copolymercompatibilizers in situ, based on a new cryogenic process developed by KWI Solutions Polymères to turnmixed plastic feeds into fine (1-5 micrometer) powders by mechanical fracturing in an extrusion process. Thisgenerates a large number of radical species at the surface of the particles, due to the polymer chain-breakingprocesses taking place in fracturation of the materials. We will investigate the use of mixed microstructurepolyisoprene (PIP) as a post-fracturation additive to react with the free radical species present, to generatecompatibilizing graft copolymers in situ during the extrusion process. The project will be concerned withgenerating PIP samples of different molecular weights, that can be used to optimize the extrusion conditionsand generate suitable compatibilizing agents. The performance of the additives will be evaluated in terms oftheir ability to improve the tensile and impact properties of the blends obtained by that approach.

非均相聚合物原料本质上是不可混溶的，这严重阻碍了消费后塑料的回收，这导致混合物中的相分离，并且回收产品的机械性能通常很差。一种完善的方法，以提高分散程度的聚合物共混物和改善机械性能是通过使用嵌段和接枝共聚物添加剂作为相容剂。不幸的是，这些材料的合成通常非常昂贵，因此不适合大规模的塑料回收。我们现在提出了一种原位生成接枝共聚物增容剂的方法，该方法基于KWI Solutions polymures开发的一种新的低温工艺，通过挤压过程中的机械断裂将混合的塑料原料转化为细（1-5微米）粉末。这在颗粒表面产生了大量自由基，这是由于在材料断裂过程中发生的聚合物链断裂过程。我们将研究使用混合微结构聚异戊二烯（PIP）作为断裂后添加剂，与存在的自由基发生反应，在挤压过程中原位生成相容的接枝共聚物。该项目将涉及生成不同分子量的PIP样品，可用于优化挤出条件并生成合适的增容剂。添加剂的性能将根据其改善通过该方法获得的共混物的拉伸和冲击性能的能力来评估。