Munir Ullah Khan, Muhammad Naeem Shah, Safir Ullah Khan, Chengjian Zhang, Xinghong Zhang
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引用次数: 0
摘要
本研究研究了铁基催化剂FeFe-DMCC的开发,用于羰基硫化物(COS)和环氧丙烷(PO)的高效共聚,从而生产聚单硫代碳酸丙烯(PPMTC)。所得聚合物的数平均分子量(Mn)在36.6 ~ 91.8 kg mol−1之间,多分散性指数(Đ)在1.7 ~ 4.8之间。FeFe-DMCC催化剂表现出优异的性能,在12小时的反应周期内,每克催化剂的聚合物产量高达1058克。这项工作的一个重大突破是催化剂有效抑制氧硫交换反应(O/S ER)的能力,这是一种通常产生混合键的副反应。相反,该工艺对单硫代碳酸盐单元的选择性超过99%,没有形成环硫代碳酸盐副产物。这种显著的控制强调了催化剂在生产清洁、定义明确的聚合物方面的效率。此外,共聚物的组成,特别是单硫代碳酸盐与醚单元的比例,可以通过改变COS的进料比来微调,从而实现聚合物性能的精确定制。这些发现表明FeFe-DMCC是一种高效、选择性的COS/PO共聚催化剂,为生产具有定制特性和最少副产物的高质量PPMTC提供了途径。这项工作代表了可持续材料发展的重大进步。
A Route to Sulfur-Containing Polymers via FeFe-DMCC-Catalyzed Copolymerization of Propylene Oxide and Carbonyl Sulfide
This study investigates the development of the iron-based catalyst FeFe-DMCC for the efficient copolymerization of carbonyl sulfide (COS) and propylene oxide (PO), leading to the production of poly(propylene monothiocarbonate)s (PPMTC). The resulting polymers exhibit number-average molecular weights (Mn) ranging from 36.6 to 91.8 kg mol−1, with polydispersity indices (Đ) between 1.7 and 4.8. The FeFe-DMCC catalyst demonstrated exceptional performance, achieving polymer yields of up to 1058 grams per gram of catalyst within a 12-h reaction period. A significant breakthrough in this work is the catalyst's ability to effectively suppress the oxygen-sulfur exchange reaction (O/S ER), a side reaction that typically generates mixed linkages. Instead, the process achieved outstanding selectivity, exceeding 99%, for monothiocarbonate units, with no formation of cyclic thiocarbonate byproducts. This remarkable control underscores the catalyst's efficiency in producing clean, well-defined polymers. Additionally, the copolymer composition, particularly the ratio of monothiocarbonate to ether units, can be finely tuned by varying the COS feed ratio, enabling precise customization of the polymer's properties. These findings establish FeFe-DMCC as a highly effective and selective catalyst for COS/PO copolymerization, offering a pathway to produce high-quality PPMTC with tailored characteristics and minimal byproduct formation. This work represents a significant advancement in sustainable materials development.
期刊介绍:
Macromolecular Chemistry and Physics publishes in all areas of polymer science - from chemistry, physical chemistry, and physics of polymers to polymers in materials science. Beside an attractive mixture of high-quality Full Papers, Trends, and Highlights, the journal offers a unique article type dedicated to young scientists – Talent.