高级等级的PLA产品的生命周期评估,通过脱聚合处理进行了新型的生命周期终结处理
Anna Schwarz1, Špela Ferjan1, Josse Kunst2
1TNO, Climate, Air and Sustainability, P.O. Box 80015, NL-3508 TA Utrecht, the Netherlands.
The Science of the total environment
|September 15, 2023
概括
像聚乳酸 (PLA) 这样的生物基塑料为环境提供了好处. 通过脱聚合的先进回收可以产生高质量的再生PLA,减少耐用产品的二氧化碳排放,但收集的设计至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 生物基塑料,如聚乳酸 (PLA),为化石基聚合物提供了替代品,减少对有限资源的依赖,减轻二氧化碳排放.
- 通过对其立体异构体 (PL(L) A和PL(D) A的战略性使用,PLA的多功能性扩展到超越一次性使用物品的耐用应用.
- 目前的机械回收方法与复杂和混合等级的PLA作斗争,限制了先进的PLA产品的循环性.
研究的目的:
- 通过使用一种新型的脱聚合回收技术,评估由混合PLA等级制成的耐用产品 (地毯) 的环境可持续性.
- 将PLA地毯的生命周期环境影响与传统设计的地毯进行比较.
- 评估收集率和回收技术对生物基产品总体可持续性的影响.
主要方法:
- 进行了"摇篮到坟墓"生命周期评估 (LCA).
- 该研究分析了一种包含混合PLA等级和脱聚合回收的耐用产品.
- 进行了敏感性和场景分析,重点关注收集率和回收技术.
主要成果:
- 与传统设计相比,PLA地毯显著减少了70%的二氧化碳相当的排放量.
- 对于土地利用,肥沃化和环境毒性而言,观察到环境影响的增加.
- 脱聚合被确定为一种具有较低二氧化碳等效排放的回收技术,特别是在优化收集场景下.
结论:
- 在家具等耐用产品中使用PLA对环境有利,前提是产品被设计用于高效的收集和高质量的回收.
- 有效的收集系统和先进的回收技术,如脱聚合,对于实现材料循环,并最大限度地提高生物基塑料的可持续性好处至关重要.
- 收集和回收的设计对于提高生物基产品的整体环境状况和确保材料循环性至关重要.
相关概念视频
Types of Step-Growth Polymers: Polyesters
2.3K
The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
2.3K
Step-Growth Polymerization: Overview
3.5K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
Many natural and synthetic polymers are produced by...
3.5K


