Long-chain alkyl polysiloxane modified magnesium silicate nanotubes and their enhancing effects on the properties of silicone rubber composites

DOI码：10.1016/j.colsurfa.2025.139155

发表刊物：Colloids and Surfaces A: Physicochemical and Engineering Aspects

关键字：Magnesium silicate nanotubes Surface modification Silicone rubber composites Mechanical properties Thermal stability

摘要：Magnesium silicate nanotubes (MgSi) have been recognized as promising fillers for silicone rubber due to their unique tubular morphology and excellent thermal stability. However, their practical application is hindered by poor compatibility with the silicone rubber matrix. To address this issue, herein, we report the surface modification of magnesium silicate using long-chain alkyl polysiloxane, yielding a modified material denoted as MgSi-Ps, which was subsequently incorporated into silicone rubber to fabricate composite materials. The polysiloxane chains were grafted onto the surface of MgSi via Si–O–Si covalent bonds, effectively transforming the surface property from hydrophilic to hydrophobic and significantly improving its dispersion within the silicone rubber matrix. The homogeneous distribution of MgSi-Ps facilitated full utilization of its high aspect ratio and char-promoting capability, leading to remarkable enhancements in both mechanical properties and thermal stability of the composites. Specifically, at a loading of 7.5 wt% MgSi-Ps, the silicone rubber composite exhibited a tensile strength of 1.9 MPa and an elongation at break of 490 %, substantially superior to those of the composite filled with pristine MgSi (1.2 MPa and 380 %, respectively). Ablation tests and thermogravimetric analysis further revealed that MgSi-Ps not only enhanced the thermal stability but also provided dual-phase flame retardancy, acting in both the gaseous and condensed phases. This study demonstrates an effective strategy for mitigating the compatibility issue between magnesium silicate nanotubes and silicone rubber, which may promote broader applications of both materials in high-performance elastomeric composites.

合写作者：Jiang Qinghuai,Ding Chongtao

论文类型：期刊论文

通讯作者：Zhang Yifu*,Yi Shengping*,Huang Chi*

论文编号：139155

卷号：732

页面范围：139155, 2026

是否译文：否

发布期刊链接：https://doi.org/10.1016/j.colsurfa.2025.139155