Selective degradation of polydimethylsiloxane (PDMS) catalyzed by [Polydentate ligand-alkali metal fluoride] complexes

影响因子：7.4

DOI码：10.1016/j.polymdegradstab.2026.112

发表刊物：Polymer Degradation and Stability

关键字：Polydimethylsiloxane； Selective degradation；Supramolecular catalyst；Host-guest recognition；Green chemistry

摘要：Conventional base catalysts such as KOH often suffer from low yields and multiple side reactions in the degradation of polydimethylsiloxane (PDMS) to produce high-value dimethyl cyclosiloxane (DMC). To overcome these limitations, a novel supramolecular catalyst-[K(cryptand[2.2.2])]F⁻ was designed and synthesized in this work by utilizing the coordination interaction between KF and cryptand[2.2.2]. In this structure, K⁺ forms a stable coordination bond with the cryptand, which effectively weakens the electrostatic interactions within KF, thereby significantly promoting the dissociation and nucleophilic reactivity of F⁻ in the organic phase and resulting in a highly efficient supramolecular catalytic system. The use of a DMSO/n-octadecyl alcohol mixed solvent not only facilitated a homogeneous reaction between PDMS and the catalyst but also reduced the solvation effect on F⁻, further enhancing its catalytic performance. Experimental results show that with only 1 % [K(cryptand[2.2.2])]F loading, the cyclic monomer yield from PDMS cleavage reached 95 %, with DMC selectivity exceeding 99.5 %. Moreover, the catalyst retained high activity over ten consecutive cycles, maintaining a yield above 93 % and demonstrating excellent stability. Additionally, an improved Dean-Stark trap was used to construct a continuous production system capable of synthesizing DMC under low solvent-circulation conditions. This study presents a new and efficient catalytic strategy for the green and high-value upcycling of silicone waste, offering promising prospects for advancing a circular economy in the silicone industry.

备注：中科院一区

合写作者：Zhang Yifu,Yuan Bo,Zheng Zeyu,Xu Jingwen,Zhang Zilong

论文类型：期刊论文

通讯作者：Yi Shengping*,Liao Jun*,Huang Chi*

论文编号：112009

学科门类：理学

文献类型：J

卷号：247

页面范围：112009，2026

是否译文：否

收录刊物：SCI

发布期刊链接：https://doi.org/10.1016/j.polymdegradstab.2026.112009