Glycidyl methacrylate-modified diatomite as reinforcing filler for natural rubber composite

IF 2.2 4区化学 Q3 CHEMISTRY, PHYSICAL Colloid and Polymer Science Pub Date : 2024-08-06 DOI:10.1007/s00396-024-05304-4

Meng Zhao, Hao Duan, Linfeng Han, Lin Zhang, Keyu Peng, Yuan Jing, Jyotishmoy Borah, Guangyi Lin

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Abstract

Glycidyl methacrylate (GMA) was grafted onto diatomite (DE) to improve the interfacial bonding between GMA and rubber using “one-step”/“two-step” methods, respectively. The hydroxyl group on DE and the amine group on γ-aminopropyltriethoxysilane (KH550) react with the epoxy group on GMA in a ring-opening reaction during the process. The modified diatomite was characterized and analyzed by using Fourier transform infrared spectroscopy (FT-IR), X-ray fluorescence spectrometer (XRF), X-ray diffraction patterns, scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). Natural rubber/diatomite (NR/DE) composites were also prepared using a wet mixing method and investigated the interfacial interactions between different DE and NR in detail using dynamic mechanical analysis (DMA) and rubber process analyzer (RPA). The result showed the improved mechanical properties of NR/DE composites for both “one-step” and “two-step” methods; however, the “two-step” method is found to be more effective. Compared with the unmodified NR/DE composites, the “two-step” modified NR/DE composites exhibited an increase in 37.8% tensile strength, 25.1% tear strength, 11.7% abrasion resistance, and 24% wet slip resistance, respectively. In addition to these, GMA has minimal effect on the elongation at break retention of the rubber composites after aging. These results showed valuable insights for the further application of diatomite in rubber.

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甲基丙烯酸缩水甘油酯改性硅藻土作为天然橡胶复合材料的增强填料

分别采用 "一步法 "和 "两步法 "将甲基丙烯酸缩水甘油酯（GMA）接枝到硅藻土（DE）上，以改善 GMA 与橡胶之间的界面结合。在此过程中，DE 上的羟基和 γ-aminopropyltriethoxysilane (KH550) 上的胺基与 GMA 上的环氧基发生开环反应。利用傅立叶变换红外光谱（FT-IR）、X 射线荧光光谱仪（XRF）、X 射线衍射图样、扫描电子显微镜（SEM）和热重分析（TGA）对改性硅藻土进行了表征和分析。此外，还采用湿混合法制备了天然橡胶/硅藻土（NR/DE）复合材料，并使用动态机械分析（DMA）和橡胶过程分析仪（RPA）详细研究了不同 DE 与 NR 之间的界面相互作用。结果表明，无论是 "一步法 "还是 "两步法"，NR/DE 复合材料的机械性能都得到了改善；但 "两步法 "的效果更好。与未改性的 NR/DE 复合材料相比，"两步法 "改性 NR/DE 复合材料的拉伸强度、撕裂强度、耐磨性和湿滑性分别提高了 37.8%、25.1%、11.7% 和 24%。此外，GMA 对橡胶复合材料老化后的断裂伸长率影响很小。这些结果为硅藻土在橡胶中的进一步应用提供了宝贵的启示。

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来源期刊

Colloid and Polymer Science 化学-高分子科学

CiteScore

4.60

自引率

4.20%

发文量

111

审稿时长

2.2 months

期刊介绍： Colloid and Polymer Science - a leading international journal of longstanding tradition - is devoted to colloid and polymer science and its interdisciplinary interactions. As such, it responds to a demand which has lost none of its actuality as revealed in the trends of contemporary materials science.