基于化学发光的评估,对 styrene 块共聚合物的可回收性进行了评估
Marius Bumbac1, Traian Zaharescu2,3, Cristina Mihaela Nicolescu4
1Faculty of Sciences and Art, Valahia University of Targoviste, 13 Aleea Sinaia, Targoviste, 130004, Romania.
Scientific reports
|November 15, 2024
概括
化学发光评估通过评估热稳定性和降解来预测 styrene 块共聚物的可回收性. SIS和30%的乙烯SBS降解速度最快,而40%的乙烯SBS和SEBS显示出更高的回收稳定性.
科学领域:
- 聚合物科学与工程 聚合物科学与工程
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 像SIS,SBS和SEBS这样的线性 styrene 块共聚合物被广泛使用,但它们的可回收性因加工过程中的降解而受到限制.
- 了解这些共聚合物的热稳定性和降解途径对于开发有效的回收策略和最大限度地减少能源消耗至关重要.
- 化学发光 (CL) 为评估材料降解和预测在热应力下性能提供了一种敏感的方法.
研究的目的:
- 用基于化学发光 (CL) 的方法评估线性烯块共聚合物的可回收性.
- 为了确定 styrene-isoprene-styrene (SIS), styrene-butadiene-styrene (SBS) 和 styrene-ethylene-butadiene-styrene (SEBS) 共聚物的热稳定性和氧化降解动力学.
- 将CL数据与其他分析技术 (IR,DSC) 相关联,以全面了解降解机制.
主要方法:
- 使用异热和非异热化学发光 (CL) 分析来研究四种不同的共聚合物结构的热降解.
- 氧化诱导时间是从CL强度档案确定,以计算氧化降解的激活能量.
- 红外 (IR) 光谱和差分扫描热量计 (DSC) 用于材料特性和降解的补充分析.
主要成果:
- 氧化降解的激活能量按照以下序列进行:SBS (30%) ≈ SIS < SBS (40%) < SEBS.
- SIS和SBS (30%烯) 共聚物表现出最快的降解,归因于快速的氧化基积累.
- 由于低反应性分解产物,SBS (40%烯) 的降解速度较慢,质量损失较小,而SEBS在较高温度 (>220°C) 下逐渐降解.
结论:
- 化学发光是一种有效的工具,用于评估 styrene 块共聚合物的可回收性和预测热稳定性.
- 分子结构,特别是组成单元的序列和类型,显著影响这些共聚合物的降解行为和稳定性.
- 这些发现为优化回收过程和根据共聚合物结构和预期的热应力进行材料选择提供了宝贵的见解.
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