Synthesis of a novel hydantoin-containing silane and its effect on the tracking and bacteria resistance of addition-cure liquid silicone rubber

Tian Liu, Xingrong Zeng,* Weizhen Fang, Xuejun Lai, Hongqiang Li

Abstract: A novel hydantoin-containing silane, [3-(5, 5-dimethylhydantoinurethano) propyl] ethoxyallyloxysilane (DMHURPAS), was synthesized and the structure was characterized by FTIR and 1H NMR. DMHURPAS was added into addition-cure liquid silicone rubber (ALSR) and effect of DMHURPAS on anti-tracking and antibacterial properties of ALSR was investigated after surface chlorination of ALSR/DMHURPAS. It was found that ALSR containing 1.5 phr DMHURPAS could pass 1A 4.5 kV level and the erosion mass decreased from 0.843 g to 0.037 g. The thermal stability of ALSR/DMHURPAS was significantly improved and the mechanical properties were also enhanced. From thermogravimetry-Fourier transform infrared spectroscopy (TG-FTIR), ALSR/DMHURPAS showed significant decrease of carbonyl compounds and cyclic oligomers but increase of CH4 and CO2, indicating that DMHURPAS could inhibit the oxidation of methyl groups and unzipping reaction, and promote the cleavage of methyl groups of ALSR. The antibacterial rate of ALSR containing 2.0 phr DMHURPAS against Escherichia coli and Staphylococcus aureus was 95.7% and 83.4%, respectively.

论文链接：https://doi.org/10.1016/j.apsusc.2017.06.117