Designed from Recycled: Turning Polyethylene Waste to Covalently Attached Polylactide Plasticizers

编号 020020205

推送时间 20190902

研究领域 林产化工 

年份 2019 

类型 期刊 

语种 英语

标题 Designed from Recycled: Turning Polyethylene Waste to Covalently Attached Polylactide Plasticizers

来源期刊 ACS Sustainable Chemistry & Engineering

期 第202期

发表时间 20190517

关键词 HDPE;  Oxidative degradation;  Feedstock recycling;  PLA;  Plasticization; 

摘要 High-density polyethylene (HDPE) waste was successfully feedstock recycled, and the obtained chemicals were utilized for synthesis of plasticizers for polylactide (PLA). First, an effective route to recycle HDPE through a microwave-assisted hydrothermal process was established. This process led to selective degradation of HDPE to a few well-defined chemicals, namely, succinic, glutaric, and adipic acid. A model plasticizer was synthesized from the same composition of dicarboxylic acids, 1,4-butanediol, and crotonic acid. The function of crotonic acid was to produce oligomers with crotonate end groups for coupling the plasticizer to PLA main chain. The plasticizer was then blended with or coupled to PLA by a reactive extrusion process. Adding the plasticizer to PLA decreased the Tg and increased the strain at break, thus reducing the brittleness of the films. The addition of 20% (w/w) grafted plasticizer increased the strain at break of PLA from 6 to 156% and decreased the Tg by 15 °C compared with neat PLA. Finally, to verify the concept, a plasticizer was also synthesized from the dicarboxylic acid product mixture obtained from the feedstock recycling of HDPE. The recycled grafted plasticizer increased the strain at break of PLA to 142% and reduced the Tg by 10 °C. A promising route for designing from recycled feedstock, turning HDPE waste to PLA plasticizers, was thus demonstrated .

服务人员 尚玮姣

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